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- /* Subroutines for insn-output.c for Intel X86.
- Copyright (C) 1988, 1992, 1994, 1995 Free Software Foundation, Inc.
-
- This file is part of GNU CC.
-
- GNU CC is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- GNU CC is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with GNU CC; see the file COPYING. If not, write to
- the Free Software Foundation, 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
-
- #include <stdio.h>
- #include <setjmp.h>
- #include <ctype.h>
- #include "config.h"
- #include "rtl.h"
- #include "regs.h"
- #include "hard-reg-set.h"
- #include "real.h"
- #include "insn-config.h"
- #include "conditions.h"
- #include "insn-flags.h"
- #include "output.h"
- #include "insn-attr.h"
- #include "tree.h"
- #include "flags.h"
- #include "function.h"
-
- #ifdef MACHO_PIC
- #include "insn-codes.h"
- #include "next/machopic.h"
- #endif
-
- #ifdef EXTRA_CONSTRAINT
- /* If EXTRA_CONSTRAINT is defined, then the 'S'
- constraint in REG_CLASS_FROM_LETTER will no longer work, and various
- asm statements that need 'S' for class SIREG will break. */
- error EXTRA_CONSTRAINT conflicts with S constraint letter
- /* The previous line used to be #error, but some compilers barf
- even if the conditional was untrue. */
- #endif
-
- #define AT_BP(mode) (gen_rtx (MEM, (mode), frame_pointer_rtx))
-
- extern FILE *asm_out_file;
- extern char *strcat ();
-
- char *singlemove_string ();
- char *output_move_const_single ();
- char *output_fp_cc0_set ();
-
- char *hi_reg_name[] = HI_REGISTER_NAMES;
- char *qi_reg_name[] = QI_REGISTER_NAMES;
- char *qi_high_reg_name[] = QI_HIGH_REGISTER_NAMES;
-
- #ifdef NEXT_SEMANTICS
- static rtx lookup_i386_stack_local ();
- #endif
-
- /* Array of the smallest class containing reg number REGNO, indexed by
- REGNO. Used by REGNO_REG_CLASS in i386.h. */
-
- enum reg_class regclass_map[FIRST_PSEUDO_REGISTER] =
- {
- /* ax, dx, cx, bx */
- AREG, DREG, CREG, BREG,
- /* si, di, bp, sp */
- SIREG, DIREG, INDEX_REGS, GENERAL_REGS,
- /* FP registers */
- FP_TOP_REG, FP_SECOND_REG, FLOAT_REGS, FLOAT_REGS,
- FLOAT_REGS, FLOAT_REGS, FLOAT_REGS, FLOAT_REGS,
- /* arg pointer */
- INDEX_REGS
- };
-
- /* Test and compare insns in i386.md store the information needed to
- generate branch and scc insns here. */
-
- struct rtx_def *i386_compare_op0 = NULL_RTX;
- struct rtx_def *i386_compare_op1 = NULL_RTX;
- struct rtx_def *(*i386_compare_gen)(), *(*i386_compare_gen_eq)();
-
- /* Register allocation order */
- char *i386_reg_alloc_order;
- static char regs_allocated[FIRST_PSEUDO_REGISTER];
-
- /* # of registers to use to pass arguments. */
- char *i386_regparm_string; /* # registers to use to pass args */
- int i386_regparm; /* i386_regparm_string as a number */
-
- /* Alignment to use for loops and jumps */
- char *i386_align_loops_string; /* power of two alignment for loops */
- char *i386_align_jumps_string; /* power of two alignment for non-loop jumps */
- char *i386_align_funcs_string; /* power of two alignment for functions */
-
- int i386_align_loops; /* power of two alignment for loops */
- int i386_align_jumps; /* power of two alignment for non-loop jumps */
- int i386_align_funcs; /* power of two alignment for functions */
-
-
- /* Sometimes certain combinations of command options do not make
- sense on a particular target machine. You can define a macro
- `OVERRIDE_OPTIONS' to take account of this. This macro, if
- defined, is executed once just after all the command options have
- been parsed.
-
- Don't use this macro to turn on various extra optimizations for
- `-O'. That is what `OPTIMIZATION_OPTIONS' is for. */
-
- void
- override_options ()
- {
- int ch, i, regno;
- char *p;
- int def_align;
-
- #ifdef SUBTARGET_OVERRIDE_OPTIONS
- SUBTARGET_OVERRIDE_OPTIONS;
- #endif
-
- /* Validate registers in register allocation order */
- if (i386_reg_alloc_order)
- {
- for (i = 0; (ch = i386_reg_alloc_order[i]) != '\0'; i++)
- {
- switch (ch)
- {
- case 'a': regno = 0; break;
- case 'd': regno = 1; break;
- case 'c': regno = 2; break;
- case 'b': regno = 3; break;
- case 'S': regno = 4; break;
- case 'D': regno = 5; break;
- case 'B': regno = 6; break;
-
- default: fatal ("Register '%c' is unknown", ch);
- }
-
- if (regs_allocated[regno])
- fatal ("Register '%c' was already specified in the allocation order", ch);
-
- regs_allocated[regno] = 1;
- }
- }
-
- /* Validate -mregparm= value */
- if (i386_regparm_string)
- {
- i386_regparm = atoi (i386_regparm_string);
- if (i386_regparm < 0 || i386_regparm > REGPARM_MAX)
- fatal ("-mregparm=%d is not between 0 and %d", i386_regparm, REGPARM_MAX);
- }
-
- def_align = (TARGET_386) ? 2 : 4;
-
- /* Validate -malign-loops= value, or provide default */
- if (i386_align_loops_string)
- {
- i386_align_loops = atoi (i386_align_loops_string);
- if (i386_align_loops < 0 || i386_align_loops > MAX_CODE_ALIGN)
- fatal ("-malign-loops=%d is not between 0 and %d",
- i386_align_loops, MAX_CODE_ALIGN);
- }
- else
- i386_align_loops = 2;
-
- /* Validate -malign-jumps= value, or provide default */
- if (i386_align_jumps_string)
- {
- i386_align_jumps = atoi (i386_align_jumps_string);
- if (i386_align_jumps < 0 || i386_align_jumps > MAX_CODE_ALIGN)
- fatal ("-malign-jumps=%d is not between 0 and %d",
- i386_align_jumps, MAX_CODE_ALIGN);
- }
- else
- i386_align_jumps = def_align;
-
- /* Validate -malign-functions= value, or provide default */
- if (i386_align_funcs_string)
- {
- i386_align_funcs = atoi (i386_align_funcs_string);
- if (i386_align_funcs < 0 || i386_align_funcs > MAX_CODE_ALIGN)
- fatal ("-malign-functions=%d is not between 0 and %d",
- i386_align_funcs, MAX_CODE_ALIGN);
- }
- else
- i386_align_funcs = def_align;
- }
-
- /* A C statement (sans semicolon) to choose the order in which to
- allocate hard registers for pseudo-registers local to a basic
- block.
-
- Store the desired register order in the array `reg_alloc_order'.
- Element 0 should be the register to allocate first; element 1, the
- next register; and so on.
-
- The macro body should not assume anything about the contents of
- `reg_alloc_order' before execution of the macro.
-
- On most machines, it is not necessary to define this macro. */
-
- void
- order_regs_for_local_alloc ()
- {
- int i, ch, order, regno;
-
- /* User specified the register allocation order */
- if (i386_reg_alloc_order)
- {
- for (i = order = 0; (ch = i386_reg_alloc_order[i]) != '\0'; i++)
- {
- switch (ch)
- {
- case 'a': regno = 0; break;
- case 'd': regno = 1; break;
- case 'c': regno = 2; break;
- case 'b': regno = 3; break;
- case 'S': regno = 4; break;
- case 'D': regno = 5; break;
- case 'B': regno = 6; break;
- }
-
- reg_alloc_order[order++] = regno;
- }
-
- for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
- {
- if (!regs_allocated[i])
- reg_alloc_order[order++] = i;
- }
- }
-
- /* If users did not specify a register allocation order, favor eax
- normally except if DImode variables are used, in which case
- favor edx before eax, which seems to cause less spill register
- not found messages. */
- else
- {
- rtx insn;
-
- for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
- reg_alloc_order[i] = i;
-
- if (optimize)
- {
- int use_dca = FALSE;
-
- for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
- {
- if (GET_CODE (insn) == INSN)
- {
- rtx set = NULL_RTX;
- rtx pattern = PATTERN (insn);
-
- if (GET_CODE (pattern) == SET)
- set = pattern;
-
- else if ((GET_CODE (pattern) == PARALLEL
- || GET_CODE (pattern) == SEQUENCE)
- && GET_CODE (XVECEXP (pattern, 0, 0)) == SET)
- set = XVECEXP (pattern, 0, 0);
-
- if (set && GET_MODE (SET_SRC (set)) == DImode)
- {
- use_dca = TRUE;
- break;
- }
- }
- }
-
- if (use_dca)
- {
- reg_alloc_order[0] = 1; /* edx */
- reg_alloc_order[1] = 2; /* ecx */
- reg_alloc_order[2] = 0; /* eax */
- }
- }
- }
- }
-
-
- /* Return nonzero if IDENTIFIER with arguments ARGS is a valid machine specific
- attribute for DECL. The attributes in ATTRIBUTES have previously been
- assigned to DECL. */
-
- int
- i386_valid_decl_attribute_p (decl, attributes, identifier, args)
- tree decl;
- tree attributes;
- tree identifier;
- tree args;
- {
- return 0;
- }
-
- /* Return nonzero if IDENTIFIER with arguments ARGS is a valid machine specific
- attribute for TYPE. The attributes in ATTRIBUTES have previously been
- assigned to TYPE. */
-
- int
- i386_valid_type_attribute_p (type, attributes, identifier, args)
- tree type;
- tree attributes;
- tree identifier;
- tree args;
- {
- if (TREE_CODE (type) != FUNCTION_TYPE
- && TREE_CODE (type) != FIELD_DECL
- && TREE_CODE (type) != TYPE_DECL)
- return 0;
-
- /* Stdcall attribute says callee is responsible for popping arguments
- if they are not variable. */
- if (is_attribute_p ("stdcall", identifier))
- return (args == NULL_TREE);
-
- /* Cdecl attribute says the callee is a normal C declaration */
- if (is_attribute_p ("cdecl", identifier))
- return (args == NULL_TREE);
-
- /* Regparm attribute specifies how many integer arguments are to be
- passed in registers */
- if (is_attribute_p ("regparm", identifier))
- {
- tree cst;
-
- if (!args || TREE_CODE (args) != TREE_LIST
- || TREE_CHAIN (args) != NULL_TREE
- || TREE_VALUE (args) == NULL_TREE)
- return 0;
-
- cst = TREE_VALUE (args);
- if (TREE_CODE (cst) != INTEGER_CST)
- return 0;
-
- if (TREE_INT_CST_HIGH (cst) != 0
- || TREE_INT_CST_LOW (cst) < 0
- || TREE_INT_CST_LOW (cst) > REGPARM_MAX)
- return 0;
-
- return 1;
- }
-
- return 0;
- }
-
- /* Return 0 if the attributes for two types are incompatible, 1 if they
- are compatible, and 2 if they are nearly compatible (which causes a
- warning to be generated). */
-
- int
- i386_comp_type_attributes (type1, type2)
- tree type1;
- tree type2;
- {
- return 1;
- }
-
-
- /* Value is the number of bytes of arguments automatically
- popped when returning from a subroutine call.
- FUNDECL is the declaration node of the function (as a tree),
- FUNTYPE is the data type of the function (as a tree),
- or for a library call it is an identifier node for the subroutine name.
- SIZE is the number of bytes of arguments passed on the stack.
-
- On the 80386, the RTD insn may be used to pop them if the number
- of args is fixed, but if the number is variable then the caller
- must pop them all. RTD can't be used for library calls now
- because the library is compiled with the Unix compiler.
- Use of RTD is a selectable option, since it is incompatible with
- standard Unix calling sequences. If the option is not selected,
- the caller must always pop the args.
-
- The attribute stdcall is equivalent to RTD on a per module basis. */
-
- int
- i386_return_pops_args (fundecl, funtype, size)
- tree fundecl;
- tree funtype;
- int size;
- {
- int rtd = TARGET_RTD;
-
- if (TREE_CODE (funtype) == IDENTIFIER_NODE)
- return 0;
-
- /* Cdecl functions override -mrtd, and never pop the stack */
- if (lookup_attribute ("cdecl", TYPE_ATTRIBUTES (funtype)))
- return 0;
-
- /* Stdcall functions will pop the stack if not variable args */
- #if defined (_WIN32) && defined (NEXT_PDO)
- if (fundecl && TYPE_STDCALL (fundecl) || TYPE_STDCALL (funtype))
- /* What if variable args??? */
- return size;
- #endif
- if (lookup_attribute ("stdcall", TYPE_ATTRIBUTES (funtype)))
- rtd = 1;
-
- if (rtd)
- {
- if (TYPE_ARG_TYPES (funtype) == NULL_TREE
- || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (funtype))) == void_type_node))
- return size;
-
- if (aggregate_value_p (TREE_TYPE (funtype)))
- return GET_MODE_SIZE (Pmode);
- }
-
- return 0;
- }
-
-
- /* Argument support functions. */
-
- /* Initialize a variable CUM of type CUMULATIVE_ARGS
- for a call to a function whose data type is FNTYPE.
- For a library call, FNTYPE is 0. */
-
- void
- init_cumulative_args (cum, fntype, libname)
- CUMULATIVE_ARGS *cum; /* argument info to initialize */
- tree fntype; /* tree ptr for function decl */
- rtx libname; /* SYMBOL_REF of library name or 0 */
- {
- static CUMULATIVE_ARGS zero_cum;
- tree param, next_param;
-
- if (TARGET_DEBUG_ARG)
- {
- fprintf (stderr, "\ninit_cumulative_args (");
- if (fntype)
- {
- tree ret_type = TREE_TYPE (fntype);
- fprintf (stderr, "fntype code = %s, ret code = %s",
- tree_code_name[ (int)TREE_CODE (fntype) ],
- tree_code_name[ (int)TREE_CODE (ret_type) ]);
- }
- else
- fprintf (stderr, "no fntype");
-
- if (libname)
- fprintf (stderr, ", libname = %s", XSTR (libname, 0));
- }
-
- *cum = zero_cum;
-
- /* Set up the number of registers to use for passing arguments. */
- cum->nregs = i386_regparm;
- if (fntype)
- {
- tree attr = lookup_attribute ("regparm", TYPE_ATTRIBUTES (fntype));
- if (attr)
- cum->nregs = TREE_INT_CST_LOW (TREE_VALUE (TREE_VALUE (attr)));
- }
-
- /* Determine if this function has variable arguments. This is
- indicated by the last argument being 'void_type_mode' if there
- are no variable arguments. If there are variable arguments, then
- we won't pass anything in registers */
-
- if (cum->nregs)
- {
- for (param = (fntype) ? TYPE_ARG_TYPES (fntype) : 0;
- param != (tree)0;
- param = next_param)
- {
- next_param = TREE_CHAIN (param);
- if (next_param == (tree)0 && TREE_VALUE (param) != void_type_node)
- cum->nregs = 0;
- }
- }
-
- if (TARGET_DEBUG_ARG)
- fprintf (stderr, ", nregs=%d )\n", cum->nregs);
-
- return;
- }
-
- /* Update the data in CUM to advance over an argument
- of mode MODE and data type TYPE.
- (TYPE is null for libcalls where that information may not be available.) */
-
- void
- function_arg_advance (cum, mode, type, named)
- CUMULATIVE_ARGS *cum; /* current arg information */
- enum machine_mode mode; /* current arg mode */
- tree type; /* type of the argument or 0 if lib support */
- int named; /* whether or not the argument was named */
- {
- int bytes = (mode == BLKmode) ? int_size_in_bytes (type) : GET_MODE_SIZE (mode);
- int words = (bytes + UNITS_PER_WORD - 1) / UNITS_PER_WORD;
-
- if (TARGET_DEBUG_ARG)
- fprintf (stderr,
- "function_adv( size=%d, words=%2d, nregs=%d, mode=%4s, named=%d )\n\n",
- words, cum->words, cum->nregs, GET_MODE_NAME (mode), named);
-
- cum->words += words;
- cum->nregs -= words;
- cum->regno += words;
-
- if (cum->nregs <= 0)
- {
- cum->nregs = 0;
- cum->regno = 0;
- }
-
- return;
- }
-
- /* Define where to put the arguments to a function.
- Value is zero to push the argument on the stack,
- or a hard register in which to store the argument.
-
- MODE is the argument's machine mode.
- TYPE is the data type of the argument (as a tree).
- This is null for libcalls where that information may
- not be available.
- CUM is a variable of type CUMULATIVE_ARGS which gives info about
- the preceding args and about the function being called.
- NAMED is nonzero if this argument is a named parameter
- (otherwise it is an extra parameter matching an ellipsis). */
-
- struct rtx_def *
- function_arg (cum, mode, type, named)
- CUMULATIVE_ARGS *cum; /* current arg information */
- enum machine_mode mode; /* current arg mode */
- tree type; /* type of the argument or 0 if lib support */
- int named; /* != 0 for normal args, == 0 for ... args */
- {
- rtx ret = NULL_RTX;
- int bytes = (mode == BLKmode) ? int_size_in_bytes (type) : GET_MODE_SIZE (mode);
- int words = (bytes + UNITS_PER_WORD - 1) / UNITS_PER_WORD;
-
- switch (mode)
- {
- default: /* for now, pass fp/complex values on the stack */
- break;
-
- case BLKmode:
- case DImode:
- case SImode:
- case HImode:
- case QImode:
- if (words <= cum->nregs)
- ret = gen_rtx (REG, mode, cum->regno);
- break;
- }
-
- if (TARGET_DEBUG_ARG)
- {
- fprintf (stderr,
- "function_arg( size=%d, words=%2d, nregs=%d, mode=%4s, named=%d",
- words, cum->words, cum->nregs, GET_MODE_NAME (mode), named);
-
- if (ret)
- fprintf (stderr, ", reg=%%e%s", reg_names[ REGNO(ret) ]);
- else
- fprintf (stderr, ", stack");
-
- fprintf (stderr, " )\n");
- }
-
- return ret;
- }
-
- /* For an arg passed partly in registers and partly in memory,
- this is the number of registers used.
- For args passed entirely in registers or entirely in memory, zero. */
-
- int
- function_arg_partial_nregs (cum, mode, type, named)
- CUMULATIVE_ARGS *cum; /* current arg information */
- enum machine_mode mode; /* current arg mode */
- tree type; /* type of the argument or 0 if lib support */
- int named; /* != 0 for normal args, == 0 for ... args */
- {
- return 0;
- }
-
-
- /* Output an insn whose source is a 386 integer register. SRC is the
- rtx for the register, and TEMPLATE is the op-code template. SRC may
- be either SImode or DImode.
-
- The template will be output with operands[0] as SRC, and operands[1]
- as a pointer to the top of the 386 stack. So a call from floatsidf2
- would look like this:
-
- output_op_from_reg (operands[1], AS1 (fild%z0,%1));
-
- where %z0 corresponds to the caller's operands[1], and is used to
- emit the proper size suffix.
-
- ??? Extend this to handle HImode - a 387 can load and store HImode
- values directly. */
-
- void
- output_op_from_reg (src, template)
- rtx src;
- char *template;
- {
- rtx xops[4];
- int size = GET_MODE_SIZE (GET_MODE (src));
-
- xops[0] = src;
- xops[1] = AT_SP (Pmode);
- xops[2] = GEN_INT (size);
- xops[3] = stack_pointer_rtx;
-
- if (size > UNITS_PER_WORD)
- {
- rtx high;
- if (size > 2 * UNITS_PER_WORD)
- {
- high = gen_rtx (REG, SImode, REGNO (src) + 2);
- output_asm_insn (AS1 (push%L0,%0), &high);
- }
- high = gen_rtx (REG, SImode, REGNO (src) + 1);
- output_asm_insn (AS1 (push%L0,%0), &high);
- }
- output_asm_insn (AS1 (push%L0,%0), &src);
-
- output_asm_insn (template, xops);
-
- output_asm_insn (AS2 (add%L3,%2,%3), xops);
- }
-
- /* Output an insn to pop an value from the 387 top-of-stack to 386
- register DEST. The 387 register stack is popped if DIES is true. If
- the mode of DEST is an integer mode, a `fist' integer store is done,
- otherwise a `fst' float store is done. */
-
- void
- output_to_reg (dest, dies)
- rtx dest;
- int dies;
- {
- rtx xops[4];
- int size = GET_MODE_SIZE (GET_MODE (dest));
-
- xops[0] = AT_SP (Pmode);
- xops[1] = stack_pointer_rtx;
- xops[2] = GEN_INT (size);
- xops[3] = dest;
-
- output_asm_insn (AS2 (sub%L1,%2,%1), xops);
-
- if (GET_MODE_CLASS (GET_MODE (dest)) == MODE_INT)
- {
- if (dies)
- output_asm_insn (AS1 (fistp%z3,%y0), xops);
- else
- output_asm_insn (AS1 (fist%z3,%y0), xops);
- }
- else if (GET_MODE_CLASS (GET_MODE (dest)) == MODE_FLOAT)
- {
- if (dies)
- output_asm_insn (AS1 (fstp%z3,%y0), xops);
- else
- {
- if (GET_MODE (dest) == XFmode)
- {
- output_asm_insn (AS1 (fstp%z3,%y0), xops);
- output_asm_insn (AS1 (fld%z3,%y0), xops);
- }
- else
- output_asm_insn (AS1 (fst%z3,%y0), xops);
- }
- }
- else
- abort ();
-
- output_asm_insn (AS1 (pop%L0,%0), &dest);
-
- if (size > UNITS_PER_WORD)
- {
- dest = gen_rtx (REG, SImode, REGNO (dest) + 1);
- output_asm_insn (AS1 (pop%L0,%0), &dest);
- if (size > 2 * UNITS_PER_WORD)
- {
- dest = gen_rtx (REG, SImode, REGNO (dest) + 1);
- output_asm_insn (AS1 (pop%L0,%0), &dest);
- }
- }
- }
-
- char *
- singlemove_string (operands)
- rtx *operands;
- {
- rtx x;
- if (GET_CODE (operands[0]) == MEM
- && GET_CODE (x = XEXP (operands[0], 0)) == PRE_DEC)
- {
- if (XEXP (x, 0) != stack_pointer_rtx)
- abort ();
- return "push%L1 %1";
- }
- else if (GET_CODE (operands[1]) == CONST_DOUBLE)
- {
- return output_move_const_single (operands);
- }
- else if (GET_CODE (operands[0]) == REG || GET_CODE (operands[1]) == REG)
- return AS2 (mov%L0,%1,%0);
- else if (CONSTANT_P (operands[1]))
- return AS2 (mov%L0,%1,%0);
- else
- {
- output_asm_insn ("push%L1 %1", operands);
- return "pop%L0 %0";
- }
- }
-
- /* Return a REG that occurs in ADDR with coefficient 1.
- ADDR can be effectively incremented by incrementing REG. */
-
- static rtx
- find_addr_reg (addr)
- rtx addr;
- {
- while (GET_CODE (addr) == PLUS)
- {
- if (GET_CODE (XEXP (addr, 0)) == REG)
- addr = XEXP (addr, 0);
- else if (GET_CODE (XEXP (addr, 1)) == REG)
- addr = XEXP (addr, 1);
- else if (CONSTANT_P (XEXP (addr, 0)))
- addr = XEXP (addr, 1);
- else if (CONSTANT_P (XEXP (addr, 1)))
- addr = XEXP (addr, 0);
- else
- abort ();
- }
- if (GET_CODE (addr) == REG)
- return addr;
- abort ();
- }
-
-
- /* Output an insn to add the constant N to the register X. */
-
- static void
- asm_add (n, x)
- int n;
- rtx x;
- {
- rtx xops[2];
- xops[0] = x;
-
- if (n == -1)
- output_asm_insn (AS1 (dec%L0,%0), xops);
- else if (n == 1)
- output_asm_insn (AS1 (inc%L0,%0), xops);
- else if (n < 0)
- {
- xops[1] = GEN_INT (-n);
- output_asm_insn (AS2 (sub%L0,%1,%0), xops);
- }
- else if (n > 0)
- {
- xops[1] = GEN_INT (n);
- output_asm_insn (AS2 (add%L0,%1,%0), xops);
- }
- }
-
-
- /* Output assembler code to perform a doubleword move insn
- with operands OPERANDS. */
-
- char *
- output_move_double (operands)
- rtx *operands;
- {
- enum {REGOP, OFFSOP, MEMOP, PUSHOP, POPOP, CNSTOP, RNDOP } optype0, optype1;
- rtx latehalf[2];
- rtx middlehalf[2];
- rtx xops[2];
- rtx addreg0 = 0, addreg1 = 0;
- int dest_overlapped_low = 0;
- int size = GET_MODE_SIZE (GET_MODE (operands[0]));
-
- middlehalf[0] = 0;
- middlehalf[1] = 0;
-
- /* First classify both operands. */
-
- if (REG_P (operands[0]))
- optype0 = REGOP;
- else if (offsettable_memref_p (operands[0]))
- optype0 = OFFSOP;
- else if (GET_CODE (XEXP (operands[0], 0)) == POST_INC)
- optype0 = POPOP;
- else if (GET_CODE (XEXP (operands[0], 0)) == PRE_DEC)
- optype0 = PUSHOP;
- else if (GET_CODE (operands[0]) == MEM)
- optype0 = MEMOP;
- else
- optype0 = RNDOP;
-
- if (REG_P (operands[1]))
- optype1 = REGOP;
- else if (CONSTANT_P (operands[1]))
- optype1 = CNSTOP;
- else if (offsettable_memref_p (operands[1]))
- optype1 = OFFSOP;
- else if (GET_CODE (XEXP (operands[1], 0)) == POST_INC)
- optype1 = POPOP;
- else if (GET_CODE (XEXP (operands[1], 0)) == PRE_DEC)
- optype1 = PUSHOP;
- else if (GET_CODE (operands[1]) == MEM)
- optype1 = MEMOP;
- else
- optype1 = RNDOP;
-
- /* Check for the cases that the operand constraints are not
- supposed to allow to happen. Abort if we get one,
- because generating code for these cases is painful. */
-
- if (optype0 == RNDOP || optype1 == RNDOP)
- abort ();
-
- /* If one operand is decrementing and one is incrementing
- decrement the former register explicitly
- and change that operand into ordinary indexing. */
-
- if (optype0 == PUSHOP && optype1 == POPOP)
- {
- /* ??? Can this ever happen on i386? */
- operands[0] = XEXP (XEXP (operands[0], 0), 0);
- asm_add (-size, operands[0]);
- if (GET_MODE (operands[1]) == XFmode)
- operands[0] = gen_rtx (MEM, XFmode, operands[0]);
- else if (GET_MODE (operands[0]) == DFmode)
- operands[0] = gen_rtx (MEM, DFmode, operands[0]);
- else
- operands[0] = gen_rtx (MEM, DImode, operands[0]);
- optype0 = OFFSOP;
- }
-
- if (optype0 == POPOP && optype1 == PUSHOP)
- {
- /* ??? Can this ever happen on i386? */
- operands[1] = XEXP (XEXP (operands[1], 0), 0);
- asm_add (-size, operands[1]);
- if (GET_MODE (operands[1]) == XFmode)
- operands[1] = gen_rtx (MEM, XFmode, operands[1]);
- else if (GET_MODE (operands[1]) == DFmode)
- operands[1] = gen_rtx (MEM, DFmode, operands[1]);
- else
- operands[1] = gen_rtx (MEM, DImode, operands[1]);
- optype1 = OFFSOP;
- }
-
- /* If an operand is an unoffsettable memory ref, find a register
- we can increment temporarily to make it refer to the second word. */
-
- if (optype0 == MEMOP)
- addreg0 = find_addr_reg (XEXP (operands[0], 0));
-
- if (optype1 == MEMOP)
- addreg1 = find_addr_reg (XEXP (operands[1], 0));
-
- /* Ok, we can do one word at a time.
- Normally we do the low-numbered word first,
- but if either operand is autodecrementing then we
- do the high-numbered word first.
-
- In either case, set up in LATEHALF the operands to use
- for the high-numbered word and in some cases alter the
- operands in OPERANDS to be suitable for the low-numbered word. */
-
- if (size == 12)
- {
- if (optype0 == REGOP)
- {
- middlehalf[0] = gen_rtx (REG, SImode, REGNO (operands[0]) + 1);
- latehalf[0] = gen_rtx (REG, SImode, REGNO (operands[0]) + 2);
- }
- else if (optype0 == OFFSOP)
- {
- middlehalf[0] = adj_offsettable_operand (operands[0], 4);
- latehalf[0] = adj_offsettable_operand (operands[0], 8);
- }
- else
- {
- middlehalf[0] = operands[0];
- latehalf[0] = operands[0];
- }
-
- if (optype1 == REGOP)
- {
- middlehalf[1] = gen_rtx (REG, SImode, REGNO (operands[1]) + 1);
- latehalf[1] = gen_rtx (REG, SImode, REGNO (operands[1]) + 2);
- }
- else if (optype1 == OFFSOP)
- {
- middlehalf[1] = adj_offsettable_operand (operands[1], 4);
- latehalf[1] = adj_offsettable_operand (operands[1], 8);
- }
- else if (optype1 == CNSTOP)
- {
- if (GET_CODE (operands[1]) == CONST_DOUBLE)
- {
- REAL_VALUE_TYPE r; long l[3];
-
- REAL_VALUE_FROM_CONST_DOUBLE (r, operands[1]);
- REAL_VALUE_TO_TARGET_LONG_DOUBLE (r, l);
- operands[1] = GEN_INT (l[0]);
- middlehalf[1] = GEN_INT (l[1]);
- latehalf[1] = GEN_INT (l[2]);
- }
- else if (CONSTANT_P (operands[1]))
- /* No non-CONST_DOUBLE constant should ever appear here. */
- abort ();
- }
- else
- {
- middlehalf[1] = operands[1];
- latehalf[1] = operands[1];
- }
- }
- else /* size is not 12: */
- {
- if (optype0 == REGOP)
- latehalf[0] = gen_rtx (REG, SImode, REGNO (operands[0]) + 1);
- else if (optype0 == OFFSOP)
- latehalf[0] = adj_offsettable_operand (operands[0], 4);
- else
- latehalf[0] = operands[0];
-
- if (optype1 == REGOP)
- latehalf[1] = gen_rtx (REG, SImode, REGNO (operands[1]) + 1);
- else if (optype1 == OFFSOP)
- latehalf[1] = adj_offsettable_operand (operands[1], 4);
- else if (optype1 == CNSTOP)
- split_double (operands[1], &operands[1], &latehalf[1]);
- else
- latehalf[1] = operands[1];
- }
-
- /* If insn is effectively movd N (sp),-(sp) then we will do the
- high word first. We should use the adjusted operand 1
- (which is N+4 (sp) or N+8 (sp))
- for the low word and middle word as well,
- to compensate for the first decrement of sp. */
- if (optype0 == PUSHOP
- && REGNO (XEXP (XEXP (operands[0], 0), 0)) == STACK_POINTER_REGNUM
- && reg_overlap_mentioned_p (stack_pointer_rtx, operands[1]))
- middlehalf[1] = operands[1] = latehalf[1];
-
- /* For (set (reg:DI N) (mem:DI ... (reg:SI N) ...)),
- if the upper part of reg N does not appear in the MEM, arrange to
- emit the move late-half first. Otherwise, compute the MEM address
- into the upper part of N and use that as a pointer to the memory
- operand. */
- if (optype0 == REGOP
- && (optype1 == OFFSOP || optype1 == MEMOP))
- {
- if (reg_mentioned_p (operands[0], XEXP (operands[1], 0))
- && reg_mentioned_p (latehalf[0], XEXP (operands[1], 0)))
- {
- /* If both halves of dest are used in the src memory address,
- compute the address into latehalf of dest. */
- compadr:
- xops[0] = latehalf[0];
- xops[1] = XEXP (operands[1], 0);
- output_asm_insn (AS2 (lea%L0,%a1,%0), xops);
- if( GET_MODE (operands[1]) == XFmode )
- {
- /* abort (); */
- operands[1] = gen_rtx (MEM, XFmode, latehalf[0]);
- middlehalf[1] = adj_offsettable_operand (operands[1], size-8);
- latehalf[1] = adj_offsettable_operand (operands[1], size-4);
- }
- else
- {
- operands[1] = gen_rtx (MEM, DImode, latehalf[0]);
- latehalf[1] = adj_offsettable_operand (operands[1], size-4);
- }
- }
- else if (size == 12
- && reg_mentioned_p (middlehalf[0], XEXP (operands[1], 0)))
- {
- /* Check for two regs used by both source and dest. */
- if (reg_mentioned_p (operands[0], XEXP (operands[1], 0))
- || reg_mentioned_p (latehalf[0], XEXP (operands[1], 0)))
- goto compadr;
-
- /* JRV says this can't happen: */
- if (addreg0 || addreg1)
- abort();
-
- /* Only the middle reg conflicts; simply put it last. */
- output_asm_insn (singlemove_string (operands), operands);
- output_asm_insn (singlemove_string (latehalf), latehalf);
- output_asm_insn (singlemove_string (middlehalf), middlehalf);
- return "";
- }
- else if (reg_mentioned_p (operands[0], XEXP (operands[1], 0)))
- /* If the low half of dest is mentioned in the source memory
- address, the arrange to emit the move late half first. */
- dest_overlapped_low = 1;
- }
-
- /* If one or both operands autodecrementing,
- do the two words, high-numbered first. */
-
- /* Likewise, the first move would clobber the source of the second one,
- do them in the other order. This happens only for registers;
- such overlap can't happen in memory unless the user explicitly
- sets it up, and that is an undefined circumstance. */
-
- /*
- if (optype0 == PUSHOP || optype1 == PUSHOP
- || (optype0 == REGOP && optype1 == REGOP
- && REGNO (operands[0]) == REGNO (latehalf[1]))
- || dest_overlapped_low)
- */
- if (optype0 == PUSHOP || optype1 == PUSHOP
- || (optype0 == REGOP && optype1 == REGOP
- && ((middlehalf[1] && REGNO (operands[0]) == REGNO (middlehalf[1]))
- || REGNO (operands[0]) == REGNO (latehalf[1])))
- || dest_overlapped_low)
- {
- /* Make any unoffsettable addresses point at high-numbered word. */
- if (addreg0)
- asm_add (size-4, addreg0);
- if (addreg1)
- asm_add (size-4, addreg1);
-
- /* Do that word. */
- output_asm_insn (singlemove_string (latehalf), latehalf);
-
- /* Undo the adds we just did. */
- if (addreg0)
- asm_add (-4, addreg0);
- if (addreg1)
- asm_add (-4, addreg1);
-
- if (size == 12)
- {
- output_asm_insn (singlemove_string (middlehalf), middlehalf);
- if (addreg0)
- asm_add (-4, addreg0);
- if (addreg1)
- asm_add (-4, addreg1);
- }
-
- /* Do low-numbered word. */
- return singlemove_string (operands);
- }
-
- /* Normal case: do the two words, low-numbered first. */
-
- output_asm_insn (singlemove_string (operands), operands);
-
- /* Do the middle one of the three words for long double */
- if (size == 12)
- {
- if (addreg0)
- asm_add (4, addreg0);
- if (addreg1)
- asm_add (4, addreg1);
-
- output_asm_insn (singlemove_string (middlehalf), middlehalf);
- }
-
- /* Make any unoffsettable addresses point at high-numbered word. */
- if (addreg0)
- asm_add (4, addreg0);
- if (addreg1)
- asm_add (4, addreg1);
-
- /* Do that word. */
- output_asm_insn (singlemove_string (latehalf), latehalf);
-
- /* Undo the adds we just did. */
- if (addreg0)
- asm_add (4-size, addreg0);
- if (addreg1)
- asm_add (4-size, addreg1);
-
- return "";
- }
-
-
- #define MAX_TMPS 2 /* max temporary registers used */
-
- /* Output the appropriate code to move push memory on the stack */
-
- char *
- output_move_pushmem (operands, insn, length, tmp_start, n_operands)
- rtx operands[];
- rtx insn;
- int length;
- int tmp_start;
- int n_operands;
- {
-
- struct {
- char *load;
- char *push;
- rtx xops[2];
- } tmp_info[MAX_TMPS];
-
- rtx src = operands[1];
- int max_tmps = 0;
- int offset = 0;
- int stack_p = reg_overlap_mentioned_p (stack_pointer_rtx, src);
- int stack_offset = 0;
- int i, num_tmps;
- rtx xops[1];
-
- if (!offsettable_memref_p (src))
- fatal_insn ("Source is not offsettable", insn);
-
- if ((length & 3) != 0)
- fatal_insn ("Pushing non-word aligned size", insn);
-
- /* Figure out which temporary registers we have available */
- for (i = tmp_start; i < n_operands; i++)
- {
- if (GET_CODE (operands[i]) == REG)
- {
- if (reg_overlap_mentioned_p (operands[i], src))
- continue;
-
- tmp_info[ max_tmps++ ].xops[1] = operands[i];
- if (max_tmps == MAX_TMPS)
- break;
- }
- }
-
- if (max_tmps == 0)
- for (offset = length - 4; offset >= 0; offset -= 4)
- {
- xops[0] = adj_offsettable_operand (src, offset + stack_offset);
- output_asm_insn (AS1(push%L0,%0), xops);
- if (stack_p)
- stack_offset += 4;
- }
-
- else
- for (offset = length - 4; offset >= 0; )
- {
- for (num_tmps = 0; num_tmps < max_tmps && offset >= 0; num_tmps++)
- {
- tmp_info[num_tmps].load = AS2(mov%L0,%0,%1);
- tmp_info[num_tmps].push = AS1(push%L0,%1);
- tmp_info[num_tmps].xops[0] = adj_offsettable_operand (src, offset + stack_offset);
- offset -= 4;
- }
-
- for (i = 0; i < num_tmps; i++)
- output_asm_insn (tmp_info[i].load, tmp_info[i].xops);
-
- for (i = 0; i < num_tmps; i++)
- output_asm_insn (tmp_info[i].push, tmp_info[i].xops);
-
- if (stack_p)
- stack_offset += 4*num_tmps;
- }
-
- return "";
- }
-
-
-
- /* Output the appropriate code to move data between two memory locations */
-
- char *
- output_move_memory (operands, insn, length, tmp_start, n_operands)
- rtx operands[];
- rtx insn;
- int length;
- int tmp_start;
- int n_operands;
- {
- struct {
- char *load;
- char *store;
- rtx xops[3];
- } tmp_info[MAX_TMPS];
-
- rtx dest = operands[0];
- rtx src = operands[1];
- rtx qi_tmp = NULL_RTX;
- int max_tmps = 0;
- int offset = 0;
- int i, num_tmps;
- rtx xops[3];
-
- if (GET_CODE (dest) == MEM
- && GET_CODE (XEXP (dest, 0)) == PRE_INC
- && XEXP (XEXP (dest, 0), 0) == stack_pointer_rtx)
- return output_move_pushmem (operands, insn, length, tmp_start, n_operands);
-
- if (!offsettable_memref_p (src))
- fatal_insn ("Source is not offsettable", insn);
-
- if (!offsettable_memref_p (dest))
- fatal_insn ("Destination is not offsettable", insn);
-
- /* Figure out which temporary registers we have available */
- for (i = tmp_start; i < n_operands; i++)
- {
- if (GET_CODE (operands[i]) == REG)
- {
- if ((length & 1) != 0 && !qi_tmp && QI_REG_P (operands[i]))
- qi_tmp = operands[i];
-
- if (reg_overlap_mentioned_p (operands[i], dest))
- fatal_insn ("Temporary register overlaps the destination", insn);
-
- if (reg_overlap_mentioned_p (operands[i], src))
- fatal_insn ("Temporary register overlaps the source", insn);
-
- tmp_info[ max_tmps++ ].xops[2] = operands[i];
- if (max_tmps == MAX_TMPS)
- break;
- }
- }
-
- if (max_tmps == 0)
- fatal_insn ("No scratch registers were found to do memory->memory moves", insn);
-
- if ((length & 1) != 0)
- {
- if (!qi_tmp)
- fatal_insn ("No byte register found when moving odd # of bytes.", insn);
- }
-
- while (length > 1)
- {
- for (num_tmps = 0; num_tmps < max_tmps; num_tmps++)
- {
- if (length >= 4)
- {
- tmp_info[num_tmps].load = AS2(mov%L0,%1,%2);
- tmp_info[num_tmps].store = AS2(mov%L0,%2,%0);
- tmp_info[num_tmps].xops[0] = adj_offsettable_operand (dest, offset);
- tmp_info[num_tmps].xops[1] = adj_offsettable_operand (src, offset);
- offset += 4;
- length -= 4;
- }
- else if (length >= 2)
- {
- tmp_info[num_tmps].load = AS2(mov%W0,%1,%2);
- tmp_info[num_tmps].store = AS2(mov%W0,%2,%0);
- tmp_info[num_tmps].xops[0] = adj_offsettable_operand (dest, offset);
- tmp_info[num_tmps].xops[1] = adj_offsettable_operand (src, offset);
- offset += 2;
- length -= 2;
- }
- else
- break;
- }
-
- for (i = 0; i < num_tmps; i++)
- output_asm_insn (tmp_info[i].load, tmp_info[i].xops);
-
- for (i = 0; i < num_tmps; i++)
- output_asm_insn (tmp_info[i].store, tmp_info[i].xops);
- }
-
- if (length == 1)
- {
- xops[0] = adj_offsettable_operand (dest, offset);
- xops[1] = adj_offsettable_operand (src, offset);
- xops[2] = qi_tmp;
- output_asm_insn (AS2(mov%B0,%1,%2), xops);
- output_asm_insn (AS2(mov%B0,%2,%0), xops);
- }
-
- return "";
- }
-
-
- int
- standard_80387_constant_p (x)
- rtx x;
- {
- #if ! defined (REAL_IS_NOT_DOUBLE) || defined (REAL_ARITHMETIC)
- REAL_VALUE_TYPE d;
- jmp_buf handler;
- int is0, is1;
-
- if (setjmp (handler))
- return 0;
-
- set_float_handler (handler);
- REAL_VALUE_FROM_CONST_DOUBLE (d, x);
- is0 = REAL_VALUES_EQUAL (d, dconst0);
- is1 = REAL_VALUES_EQUAL (d, dconst1);
- set_float_handler (NULL_PTR);
-
- if (is0)
- return 1;
-
- if (is1)
- return 2;
-
- /* Note that on the 80387, other constants, such as pi,
- are much slower to load as standard constants
- than to load from doubles in memory! */
- #endif
-
- return 0;
- }
-
- char *
- output_move_const_single (operands)
- rtx *operands;
- {
- if (FP_REG_P (operands[0]))
- {
- int conval = standard_80387_constant_p (operands[1]);
-
- if (conval == 1)
- return "fldz";
-
- if (conval == 2)
- return "fld1";
- }
- if (GET_CODE (operands[1]) == CONST_DOUBLE)
- {
- REAL_VALUE_TYPE r; long l;
-
- if (GET_MODE (operands[1]) == XFmode)
- abort ();
-
- REAL_VALUE_FROM_CONST_DOUBLE (r, operands[1]);
- REAL_VALUE_TO_TARGET_SINGLE (r, l);
- operands[1] = GEN_INT (l);
- }
- return singlemove_string (operands);
- }
-
- /* Returns 1 if OP is either a symbol reference or a sum of a symbol
- reference and a constant. */
-
- int
- symbolic_operand (op, mode)
- register rtx op;
- enum machine_mode mode;
- {
- switch (GET_CODE (op))
- {
- case SYMBOL_REF:
- case LABEL_REF:
- return 1;
- case CONST:
- op = XEXP (op, 0);
- return (
- #ifdef NEXT_SEMANTICS
- GET_CODE (op) == SYMBOL_REF ||
- #endif
- (GET_CODE (XEXP (op, 0)) == SYMBOL_REF
- || GET_CODE (XEXP (op, 0)) == LABEL_REF)
- && GET_CODE (XEXP (op, 1)) == CONST_INT);
- default:
- return 0;
- }
- }
-
- /* Test for a valid operand for a call instruction.
- Don't allow the arg pointer register or virtual regs
- since they may change into reg + const, which the patterns
- can't handle yet. */
-
- int
- call_insn_operand (op, mode)
- rtx op;
- enum machine_mode mode;
- {
- if (GET_CODE (op) == MEM
- && ((CONSTANT_ADDRESS_P (XEXP (op, 0))
- /* This makes a difference for PIC. */
- && general_operand (XEXP (op, 0), Pmode))
- || (GET_CODE (XEXP (op, 0)) == REG
- && XEXP (op, 0) != arg_pointer_rtx
- && !(REGNO (XEXP (op, 0)) >= FIRST_PSEUDO_REGISTER
- && REGNO (XEXP (op, 0)) <= LAST_VIRTUAL_REGISTER))))
- return 1;
- return 0;
- }
-
- /* Like call_insn_operand but allow (mem (symbol_ref ...))
- even if pic. */
-
- int
- expander_call_insn_operand (op, mode)
- rtx op;
- enum machine_mode mode;
- {
- if (GET_CODE (op) == MEM
- && (CONSTANT_ADDRESS_P (XEXP (op, 0))
- || (GET_CODE (XEXP (op, 0)) == REG
- && XEXP (op, 0) != arg_pointer_rtx
- && !(REGNO (XEXP (op, 0)) >= FIRST_PSEUDO_REGISTER
- && REGNO (XEXP (op, 0)) <= LAST_VIRTUAL_REGISTER))))
- return 1;
- return 0;
- }
-
- /* Return 1 if OP is a comparison operator that can use the condition code
- generated by an arithmetic operation. */
-
- int
- arithmetic_comparison_operator (op, mode)
- register rtx op;
- enum machine_mode mode;
- {
- enum rtx_code code;
-
- if (mode != VOIDmode && mode != GET_MODE (op))
- return 0;
- code = GET_CODE (op);
- if (GET_RTX_CLASS (code) != '<')
- return 0;
-
- return (code != GT && code != LE);
- }
-
- /* Returns 1 if OP contains a symbol reference */
-
- int
- symbolic_reference_mentioned_p (op)
- rtx op;
- {
- register char *fmt;
- register int i;
-
- if (GET_CODE (op) == SYMBOL_REF || GET_CODE (op) == LABEL_REF)
- return 1;
-
- fmt = GET_RTX_FORMAT (GET_CODE (op));
- for (i = GET_RTX_LENGTH (GET_CODE (op)) - 1; i >= 0; i--)
- {
- if (fmt[i] == 'E')
- {
- register int j;
-
- for (j = XVECLEN (op, i) - 1; j >= 0; j--)
- if (symbolic_reference_mentioned_p (XVECEXP (op, i, j)))
- return 1;
- }
- else if (fmt[i] == 'e' && symbolic_reference_mentioned_p (XEXP (op, i)))
- return 1;
- }
-
- return 0;
- }
-
- /* This function generates the assembly code for function entry.
- FILE is an stdio stream to output the code to.
- SIZE is an int: how many units of temporary storage to allocate. */
-
- void
- function_prologue (file, size)
- FILE *file;
- int size;
- {
- register int regno;
- int limit;
- rtx xops[4];
- int pic_reg_used = flag_pic && (current_function_uses_pic_offset_table
- || current_function_uses_const_pool);
-
- xops[0] = stack_pointer_rtx;
- xops[1] = frame_pointer_rtx;
- xops[2] = GEN_INT (size);
- if (frame_pointer_needed)
- {
- output_asm_insn ("push%L1 %1", xops);
- output_asm_insn (AS2 (mov%L0,%0,%1), xops);
- }
-
- #ifdef _WIN32
- /* In Windows, the stack is bounded by a "guard" page. When
- a function writes to the guard page, a page fault occurs and
- the system moves the guard page to the next available contiguous
- page (potentially reserving additional memory if necessary) and
- then commits the new page to physical memory. The problem
- is if the program writes to a page beyond the guard page. In
- this case the system just page faults and causes a stack
- overflow exception and the program crashes. The Microsoft
- compiler performs stack checking in the function prologue.
- Generally this call to __chkstk is only emitted when a function
- needs stack space that is greater than the vm page size (4K).
- For the MS compiler there is the option to turn this on for
- all functions (at the price of performance) but we're not
- interested in that so we only check for stack sizes greater
- than the vm_page size.
-
- To do the stack check, put the size needed into eax and then call
- __chkstk. This will safely allocate the space and adjust the
- stack pointer. */
- if (size >= 4096)
- {
- rtx yops[4];
- yops[0] = gen_rtx( REG, SImode, 0 ); // Get rtx for eax
- yops[1] = GEN_INT( size ); // Get rtx for the size
-
- output_asm_insn( AS2( mov%L1, %1, %0 ), yops ); // Move size to eax
- output_asm_insn( "call __chkstk", yops ); // Call __chkstk
- }
- else
- #endif /* _WIN32 */
- if (size)
- output_asm_insn (AS2 (sub%L0,%2,%0), xops);
-
- /* Note If use enter it is NOT reversed args.
- This one is not reversed from intel!!
- I think enter is slower. Also sdb doesn't like it.
- But if you want it the code is:
- {
- xops[3] = const0_rtx;
- output_asm_insn ("enter %2,%3", xops);
- }
- */
- limit = (frame_pointer_needed ? FRAME_POINTER_REGNUM : STACK_POINTER_REGNUM);
- for (regno = limit - 1; regno >= 0; regno--)
- if ((regs_ever_live[regno] && ! call_used_regs[regno])
- #ifndef MACHO_PIC
- || (regno == PIC_OFFSET_TABLE_REGNUM && pic_reg_used)
- #endif
- )
- {
- xops[0] = gen_rtx (REG, SImode, regno);
- output_asm_insn ("push%L0 %0", xops);
- }
-
- #ifdef NeXT
- if (profile_flag)
- {
- extern int profile_label_no;
-
- fprintf (file, "\tmovl $%sP%d,%%eax\n", LPREFIX, profile_label_no);
- fprintf (file, "\tcall mcount\n");
- }
- #endif
-
- if (pic_reg_used)
- {
- #ifdef MACHO_PIC
- if (PIC_OFFSET_TABLE_REGNUM < FIRST_PSEUDO_REGISTER)
- #endif
- xops[0] = pic_offset_table_rtx;
- #ifdef MACHO_PIC
- else if (reg_renumber[PIC_OFFSET_TABLE_REGNUM] != -1)
- xops[0] = regno_reg_rtx [PIC_OFFSET_TABLE_REGNUM];
- else
- xops[0] = lookup_i386_stack_local (SImode, 2);
- }
- if (pic_reg_used && xops[0])
- {
- #endif
- xops[1] = (rtx) gen_label_rtx ();
-
- output_asm_insn (AS1 (call,%P1), xops);
- ASM_OUTPUT_INTERNAL_LABEL (file, "L", CODE_LABEL_NUMBER (xops[1]));
- #ifdef MACHO_PIC
- assemble_name (file, machopic_function_base_name ());
- asm_fprintf (file, ":\n");
- #endif
- output_asm_insn (AS1 (pop%L0,%0), xops);
- #ifdef MACHO_PIC
- {
- xops[1] = lookup_i386_stack_local (SImode, 2);
- if (xops[1] != NULL_RTX && xops[0] != xops[1])
- {
- if (GET_CODE(xops[0]) == REG)
- output_asm_insn ("movl %0,%1", xops);
- else
- {
- output_asm_insn ("pushl %0", xops);
- output_asm_insn ("popl %1", xops);
- }
- }
- }
- #else
- output_asm_insn ("addl $_GLOBAL_OFFSET_TABLE_+[.-%P1],%0", xops);
- #endif
- }
-
- #ifdef NEXT_SEMANTICS
- if (size)
- {
- extern int flag_check_mem;
- xops[2] = GEN_INT (size);
- if (flag_check_mem)
- output_asm_insn ("push%L0 %2\n\tcall _check_mem_enter", xops);
- }
- #endif
-
- }
-
- /* Return 1 if it is appropriate to emit `ret' instructions in the
- body of a function. Do this only if the epilogue is simple, needing a
- couple of insns. Prior to reloading, we can't tell how many registers
- must be saved, so return 0 then.
-
- If NON_SAVING_SETJMP is defined and true, then it is not possible
- for the epilogue to be simple, so return 0. This is a special case
- since NON_SAVING_SETJMP will not cause regs_ever_live to change until
- final, but jump_optimize may need to know sooner if a `return' is OK. */
-
- int
- simple_386_epilogue ()
- {
- int regno;
- int nregs = 0;
- int reglimit = (frame_pointer_needed
- ? FRAME_POINTER_REGNUM : STACK_POINTER_REGNUM);
- int pic_reg_used = flag_pic && (current_function_uses_pic_offset_table
- || current_function_uses_const_pool);
-
- #ifdef NON_SAVING_SETJMP
- if (NON_SAVING_SETJMP && current_function_calls_setjmp)
- return 0;
- #endif
-
- if (! reload_completed)
- return 0;
-
- for (regno = reglimit - 1; regno >= 0; regno--)
- if ((regs_ever_live[regno] && ! call_used_regs[regno])
- #ifndef MACHO_PIC
- || (regno == PIC_OFFSET_TABLE_REGNUM && pic_reg_used)
- #endif
- )
- nregs++;
-
- return nregs == 0 || ! frame_pointer_needed;
- }
-
-
- /* This function generates the assembly code for function exit.
- FILE is an stdio stream to output the code to.
- SIZE is an int: how many units of temporary storage to deallocate. */
-
- void
- function_epilogue (file, size)
- FILE *file;
- int size;
- {
- register int regno;
- register int nregs, limit;
- int offset;
- rtx xops[3];
- int pic_reg_used = flag_pic && (current_function_uses_pic_offset_table
- || current_function_uses_const_pool);
-
- /* Compute the number of registers to pop */
-
- limit = (frame_pointer_needed
- ? FRAME_POINTER_REGNUM
- : STACK_POINTER_REGNUM);
-
- nregs = 0;
-
- for (regno = limit - 1; regno >= 0; regno--)
- if ((regs_ever_live[regno] && ! call_used_regs[regno])
- #ifndef MACHO_PIC
- || (regno == PIC_OFFSET_TABLE_REGNUM && pic_reg_used)
- #endif
- )
- nregs++;
-
- /* sp is often unreliable so we must go off the frame pointer,
- */
-
- /* In reality, we may not care if sp is unreliable, because we can
- restore the register relative to the frame pointer. In theory,
- since each move is the same speed as a pop, and we don't need the
- leal, this is faster. For now restore multiple registers the old
- way. */
-
- offset = -size - (nregs * UNITS_PER_WORD);
-
- xops[2] = stack_pointer_rtx;
-
- if (nregs > 1 || ! frame_pointer_needed)
- {
- if (frame_pointer_needed)
- {
- xops[0] = adj_offsettable_operand (AT_BP (Pmode), offset);
- output_asm_insn (AS2 (lea%L2,%0,%2), xops);
- }
-
- for (regno = 0; regno < limit; regno++)
- if ((regs_ever_live[regno] && ! call_used_regs[regno])
- #ifndef MACHO_PIC
- || (regno == PIC_OFFSET_TABLE_REGNUM && pic_reg_used)
- #endif
- )
- {
- xops[0] = gen_rtx (REG, SImode, regno);
- output_asm_insn ("pop%L0 %0", xops);
- }
- }
- else
- for (regno = 0; regno < limit; regno++)
- if ((regs_ever_live[regno] && ! call_used_regs[regno])
- #ifndef MACHO_PIC
- || (regno == PIC_OFFSET_TABLE_REGNUM && pic_reg_used)
- #endif
- )
- {
- xops[0] = gen_rtx (REG, SImode, regno);
- xops[1] = adj_offsettable_operand (AT_BP (Pmode), offset);
- output_asm_insn (AS2 (mov%L0,%1,%0), xops);
- offset += 4;
- }
-
- if (frame_pointer_needed)
- {
- /* On i486, mov & pop is faster than "leave". */
-
- if (!TARGET_386)
- {
- xops[0] = frame_pointer_rtx;
- output_asm_insn (AS2 (mov%L2,%0,%2), xops);
- output_asm_insn ("pop%L0 %0", xops);
- }
- else
- output_asm_insn ("leave", xops);
- }
- else if (size)
- {
- /* If there is no frame pointer, we must still release the frame. */
-
- xops[0] = GEN_INT (size);
- output_asm_insn (AS2 (add%L2,%0,%2), xops);
- }
-
- #ifdef NEXT_SEMANTICS
- if (flag_check_mem)
- {
- xops[0] = GEN_INT (size);
- output_asm_insn ("push%L0 %0\n\tcall _check_mem_exit", xops);
- }
- #endif
-
- if (current_function_pops_args && current_function_args_size)
- {
- xops[1] = GEN_INT (current_function_pops_args);
-
- /* i386 can only pop 32K bytes (maybe 64K? Is it signed?). If
- asked to pop more, pop return address, do explicit add, and jump
- indirectly to the caller. */
-
- if (current_function_pops_args >= 32768)
- {
- /* ??? Which register to use here? */
- xops[0] = gen_rtx (REG, SImode, 2);
- output_asm_insn ("pop%L0 %0", xops);
- output_asm_insn (AS2 (add%L2,%1,%2), xops);
- output_asm_insn ("jmp %*%0", xops);
- }
- else
- output_asm_insn ("ret %1", xops);
- }
- else
- output_asm_insn ("ret", xops);
- }
-
-
- /* GO_IF_LEGITIMATE_ADDRESS recognizes an RTL expression
- that is a valid memory address for an instruction.
- The MODE argument is the machine mode for the MEM expression
- that wants to use this address.
-
- On x86, legitimate addresses are:
- base movl (base),reg
- displacement movl disp,reg
- base + displacement movl disp(base),reg
- index + base movl (base,index),reg
- (index + base) + displacement movl disp(base,index),reg
- index*scale movl (,index,scale),reg
- index*scale + disp movl disp(,index,scale),reg
- index*scale + base movl (base,index,scale),reg
- (index*scale + base) + disp movl disp(base,index,scale),reg
-
- In each case, scale can be 1, 2, 4, 8. */
-
- /* This is exactly the same as print_operand_addr, except that
- it recognizes addresses instead of printing them.
-
- It only recognizes address in canonical form. LEGITIMIZE_ADDRESS should
- convert common non-canonical forms to canonical form so that they will
- be recognized. */
-
- #define ADDR_INVALID(msg,insn) \
- do { \
- if (TARGET_DEBUG_ADDR) \
- { \
- fprintf (stderr, msg); \
- debug_rtx (insn); \
- } \
- } while (0)
-
- int
- legitimate_address_p (mode, addr, strict)
- enum machine_mode mode;
- register rtx addr;
- int strict;
- {
- rtx base = NULL_RTX;
- rtx indx = NULL_RTX;
- rtx scale = NULL_RTX;
- rtx disp = NULL_RTX;
-
- if (TARGET_DEBUG_ADDR)
- {
- fprintf (stderr,
- "\n==========\nGO_IF_LEGITIMATE_ADDRESS, mode = %s, strict = %d\n",
- GET_MODE_NAME (mode), strict);
-
- debug_rtx (addr);
- }
-
- if (GET_CODE (addr) == REG || GET_CODE (addr) == SUBREG)
- base = addr; /* base reg */
-
- else if (GET_CODE (addr) == PLUS)
- {
- rtx op0 = XEXP (addr, 0);
- rtx op1 = XEXP (addr, 1);
- enum rtx_code code0 = GET_CODE (op0);
- enum rtx_code code1 = GET_CODE (op1);
-
- if (code0 == REG || code0 == SUBREG)
- {
- if (code1 == REG || code1 == SUBREG)
- {
- indx = op0; /* index + base */
- base = op1;
- }
-
- else
- {
- base = op0; /* base + displacement */
- disp = op1;
- }
- }
-
- else if (code0 == MULT)
- {
- indx = XEXP (op0, 0);
- scale = XEXP (op0, 1);
-
- if (code1 == REG || code1 == SUBREG)
- base = op1; /* index*scale + base */
-
- else
- disp = op1; /* index*scale + disp */
- }
-
- else if (code0 == PLUS && GET_CODE (XEXP (op0, 0)) == MULT)
- {
- indx = XEXP (XEXP (op0, 0), 0); /* index*scale + base + disp */
- scale = XEXP (XEXP (op0, 0), 1);
- base = XEXP (op0, 1);
- disp = op1;
- }
-
- else if (code0 == PLUS)
- {
- indx = XEXP (op0, 0); /* index + base + disp */
- base = XEXP (op0, 1);
- disp = op1;
- }
-
- else
- {
- ADDR_INVALID ("PLUS subcode is not valid.\n", op0);
- return FALSE;
- }
- }
-
- else if (GET_CODE (addr) == MULT)
- {
- indx = XEXP (addr, 0); /* index*scale */
- scale = XEXP (addr, 1);
- }
-
- else
- disp = addr; /* displacement */
-
- /* Allow arg pointer and stack pointer as index if there is not scaling */
- if (base && indx && !scale
- && (indx == arg_pointer_rtx || indx == stack_pointer_rtx))
- {
- rtx tmp = base;
- base = indx;
- indx = tmp;
- }
-
- /* Validate base register */
- /* Don't allow SUBREG's here, it can lead to spill failures when the base
- is one word out of a two word structure, which is represented internally
- as a DImode int. */
- if (base)
- {
- if (GET_CODE (base) != REG)
- {
- ADDR_INVALID ("Base is not a register.\n", base);
- return FALSE;
- }
-
- if ((strict && !REG_OK_FOR_BASE_STRICT_P (base))
- || (!strict && !REG_OK_FOR_BASE_NONSTRICT_P (base)))
- {
- ADDR_INVALID ("Base is not valid.\n", base);
- return FALSE;
- }
- }
-
- /* Validate index register */
- /* Don't allow SUBREG's here, it can lead to spill failures when the index
- is one word out of a two word structure, which is represented internally
- as a DImode int. */
- if (indx)
- {
- if (GET_CODE (indx) != REG)
- {
- ADDR_INVALID ("Index is not a register.\n", indx);
- return FALSE;
- }
-
- if ((strict && !REG_OK_FOR_INDEX_STRICT_P (indx))
- || (!strict && !REG_OK_FOR_INDEX_NONSTRICT_P (indx)))
- {
- ADDR_INVALID ("Index is not valid.\n", indx);
- return FALSE;
- }
- }
- else if (scale)
- abort (); /* scale w/o index invalid */
-
- /* Validate scale factor */
- if (scale)
- {
- HOST_WIDE_INT value;
-
- if (GET_CODE (scale) != CONST_INT)
- {
- ADDR_INVALID ("Scale is not valid.\n", scale);
- return FALSE;
- }
-
- value = INTVAL (scale);
- if (value != 1 && value != 2 && value != 4 && value != 8)
- {
- ADDR_INVALID ("Scale is not a good multiplier.\n", scale);
- return FALSE;
- }
- }
-
- /* Validate displacement */
- if (disp)
- {
- if (!CONSTANT_ADDRESS_P (disp))
- {
- ADDR_INVALID ("Displacement is not valid.\n", disp);
- return FALSE;
- }
-
- if (GET_CODE (disp) == CONST_DOUBLE)
- {
- ADDR_INVALID ("Displacement is a const_double.\n", disp);
- return FALSE;
- }
-
- if (flag_pic && SYMBOLIC_CONST (disp) && base != pic_offset_table_rtx
- && (indx != pic_offset_table_rtx || scale != NULL_RTX))
- {
- ADDR_INVALID ("Displacement is an invalid pic reference.\n", disp);
- return FALSE;
- }
-
- if (HALF_PIC_P () && HALF_PIC_ADDRESS_P (disp)
- && (base != NULL_RTX || indx != NULL_RTX))
- {
- ADDR_INVALID ("Displacement is an invalid half-pic reference.\n", disp);
- return FALSE;
- }
- }
-
- if (TARGET_DEBUG_ADDR)
- fprintf (stderr, "Address is valid.\n");
-
- /* Everything looks valid, return true */
- return TRUE;
- }
-
-
- /* Return a legitimate reference for ORIG (an address) using the
- register REG. If REG is 0, a new pseudo is generated.
-
- There are three types of references that must be handled:
-
- 1. Global data references must load the address from the GOT, via
- the PIC reg. An insn is emitted to do this load, and the reg is
- returned.
-
- 2. Static data references must compute the address as an offset
- from the GOT, whose base is in the PIC reg. An insn is emitted to
- compute the address into a reg, and the reg is returned. Static
- data objects have SYMBOL_REF_FLAG set to differentiate them from
- global data objects.
-
- 3. Constant pool addresses must be handled special. They are
- considered legitimate addresses, but only if not used with regs.
- When printed, the output routines know to print the reference with the
- PIC reg, even though the PIC reg doesn't appear in the RTL.
-
- GO_IF_LEGITIMATE_ADDRESS rejects symbolic references unless the PIC
- reg also appears in the address (except for constant pool references,
- noted above).
-
- "switch" statements also require special handling when generating
- PIC code. See comments by the `casesi' insn in i386.md for details. */
-
- rtx
- legitimize_pic_address (orig, reg)
- rtx orig;
- rtx reg;
- {
- rtx addr = orig;
- rtx new = orig;
-
- #ifdef MACHO_PIC
- if (reg == 0)
- reg = gen_reg_rtx (Pmode);
- return machopic_legitimize_pic_address (orig, GET_MODE (orig), reg);
- #endif
-
- if (GET_CODE (addr) == SYMBOL_REF || GET_CODE (addr) == LABEL_REF)
- {
- if (GET_CODE (addr) == SYMBOL_REF && CONSTANT_POOL_ADDRESS_P (addr))
- reg = new = orig;
- else
- {
- if (reg == 0)
- reg = gen_reg_rtx (Pmode);
-
- if ((GET_CODE (addr) == SYMBOL_REF && SYMBOL_REF_FLAG (addr))
- || GET_CODE (addr) == LABEL_REF)
- new = gen_rtx (PLUS, Pmode, pic_offset_table_rtx, orig);
- else
- new = gen_rtx (MEM, Pmode,
- gen_rtx (PLUS, Pmode,
- pic_offset_table_rtx, orig));
-
- emit_move_insn (reg, new);
- }
- current_function_uses_pic_offset_table = 1;
- return reg;
- }
- else if (GET_CODE (addr) == CONST || GET_CODE (addr) == PLUS)
- {
- rtx base;
-
- if (GET_CODE (addr) == CONST)
- {
- addr = XEXP (addr, 0);
- if (GET_CODE (addr) != PLUS)
- abort ();
- }
-
- if (XEXP (addr, 0) == pic_offset_table_rtx)
- return orig;
-
- if (reg == 0)
- reg = gen_reg_rtx (Pmode);
-
- base = legitimize_pic_address (XEXP (addr, 0), reg);
- addr = legitimize_pic_address (XEXP (addr, 1),
- base == reg ? NULL_RTX : reg);
-
- if (GET_CODE (addr) == CONST_INT)
- return plus_constant (base, INTVAL (addr));
-
- if (GET_CODE (addr) == PLUS && CONSTANT_P (XEXP (addr, 1)))
- {
- base = gen_rtx (PLUS, Pmode, base, XEXP (addr, 0));
- addr = XEXP (addr, 1);
- }
- return gen_rtx (PLUS, Pmode, base, addr);
- }
- return new;
- }
-
-
- /* Emit insns to move operands[1] into operands[0]. */
-
- void
- emit_pic_move (operands, mode)
- rtx *operands;
- enum machine_mode mode;
- {
- rtx temp = reload_in_progress ? operands[0] : gen_reg_rtx (Pmode);
-
- #ifdef MACHO_PIC
- if (MACHOPIC_PURE)
- {
- operands[1] = machopic_indirect_data_reference (operands[1], temp);
- operands[1] = machopic_legitimize_pic_address (operands[1], mode,
- temp == operands[1] ? 0 : temp);
- }
- else if (MACHOPIC_INDIRECT)
- {
- operands[1] = machopic_indirect_data_reference (operands[1], 0);
- }
- #else
- if (GET_CODE (operands[0]) == MEM && SYMBOLIC_CONST (operands[1]))
- operands[1] = (rtx) force_reg (SImode, operands[1]);
- else
- operands[1] = legitimize_pic_address (operands[1], temp);
- #endif
- }
-
-
- /* Try machine-dependent ways of modifying an illegitimate address
- to be legitimate. If we find one, return the new, valid address.
- This macro is used in only one place: `memory_address' in explow.c.
-
- OLDX is the address as it was before break_out_memory_refs was called.
- In some cases it is useful to look at this to decide what needs to be done.
-
- MODE and WIN are passed so that this macro can use
- GO_IF_LEGITIMATE_ADDRESS.
-
- It is always safe for this macro to do nothing. It exists to recognize
- opportunities to optimize the output.
-
- For the 80386, we handle X+REG by loading X into a register R and
- using R+REG. R will go in a general reg and indexing will be used.
- However, if REG is a broken-out memory address or multiplication,
- nothing needs to be done because REG can certainly go in a general reg.
-
- When -fpic is used, special handling is needed for symbolic references.
- See comments by legitimize_pic_address in i386.c for details. */
-
- rtx
- legitimize_address (x, oldx, mode)
- register rtx x;
- register rtx oldx;
- enum machine_mode mode;
- {
- int changed = 0;
- unsigned log;
-
- if (TARGET_DEBUG_ADDR)
- {
- fprintf (stderr, "\n==========\nLEGITIMIZE_ADDRESS, mode = %s\n", GET_MODE_NAME (mode));
- debug_rtx (x);
- }
-
- if (flag_pic && SYMBOLIC_CONST (x))
- return legitimize_pic_address (x, 0);
-
- /* Canonicalize shifts by 0, 1, 2, 3 into multiply */
- if (GET_CODE (x) == ASHIFT
- && GET_CODE (XEXP (x, 1)) == CONST_INT
- && (log = (unsigned)exact_log2 (INTVAL (XEXP (x, 1)))) < 4)
- {
- changed = 1;
- x = gen_rtx (MULT, Pmode,
- force_reg (Pmode, XEXP (x, 0)),
- GEN_INT (1 << log));
- }
-
- if (GET_CODE (x) == PLUS)
- {
- /* Canonicalize shifts by 0, 1, 2, 3 into multiply */
- if (GET_CODE (XEXP (x, 0)) == ASHIFT
- && GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT
- && (log = (unsigned)exact_log2 (INTVAL (XEXP (XEXP (x, 0), 1)))) < 4)
- {
- changed = 1;
- XEXP (x, 0) = gen_rtx (MULT, Pmode,
- force_reg (Pmode, XEXP (XEXP (x, 0), 0)),
- GEN_INT (1 << log));
- }
-
- if (GET_CODE (XEXP (x, 1)) == ASHIFT
- && GET_CODE (XEXP (XEXP (x, 1), 1)) == CONST_INT
- && (log = (unsigned)exact_log2 (INTVAL (XEXP (XEXP (x, 1), 1)))) < 4)
- {
- changed = 1;
- XEXP (x, 1) = gen_rtx (MULT, Pmode,
- force_reg (Pmode, XEXP (XEXP (x, 1), 0)),
- GEN_INT (1 << log));
- }
-
- /* Put multiply first if it isn't already */
- if (GET_CODE (XEXP (x, 1)) == MULT)
- {
- rtx tmp = XEXP (x, 0);
- XEXP (x, 0) = XEXP (x, 1);
- XEXP (x, 1) = tmp;
- changed = 1;
- }
-
- /* Canonicalize (plus (mult (reg) (const)) (plus (reg) (const)))
- into (plus (plus (mult (reg) (const)) (reg)) (const)). This can be
- created by virtual register instantiation, register elimination, and
- similar optimizations. */
- if (GET_CODE (XEXP (x, 0)) == MULT && GET_CODE (XEXP (x, 1)) == PLUS)
- {
- changed = 1;
- x = gen_rtx (PLUS, Pmode,
- gen_rtx (PLUS, Pmode, XEXP (x, 0), XEXP (XEXP (x, 1), 0)),
- XEXP (XEXP (x, 1), 1));
- }
-
- /* Canonicalize (plus (plus (mult (reg) (const)) (plus (reg) (const))) const)
- into (plus (plus (mult (reg) (const)) (reg)) (const)). */
- else if (GET_CODE (x) == PLUS && GET_CODE (XEXP (x, 0)) == PLUS
- && GET_CODE (XEXP (XEXP (x, 0), 0)) == MULT
- && GET_CODE (XEXP (XEXP (x, 0), 1)) == PLUS
- && CONSTANT_P (XEXP (x, 1)))
- {
- rtx constant, other;
-
- if (GET_CODE (XEXP (x, 1)) == CONST_INT)
- {
- constant = XEXP (x, 1);
- other = XEXP (XEXP (XEXP (x, 0), 1), 1);
- }
- else if (GET_CODE (XEXP (XEXP (XEXP (x, 0), 1), 1)) == CONST_INT)
- {
- constant = XEXP (XEXP (XEXP (x, 0), 1), 1);
- other = XEXP (x, 1);
- }
- else
- constant = 0;
-
- if (constant)
- {
- changed = 1;
- x = gen_rtx (PLUS, Pmode,
- gen_rtx (PLUS, Pmode, XEXP (XEXP (x, 0), 0),
- XEXP (XEXP (XEXP (x, 0), 1), 0)),
- plus_constant (other, INTVAL (constant)));
- }
- }
-
- if (changed && legitimate_address_p (mode, x, FALSE))
- return x;
-
- if (GET_CODE (XEXP (x, 0)) == MULT)
- {
- changed = 1;
- XEXP (x, 0) = force_operand (XEXP (x, 0), 0);
- }
-
- if (GET_CODE (XEXP (x, 1)) == MULT)
- {
- changed = 1;
- XEXP (x, 1) = force_operand (XEXP (x, 1), 0);
- }
-
- if (changed
- && GET_CODE (XEXP (x, 1)) == REG
- && GET_CODE (XEXP (x, 0)) == REG)
- return x;
-
- if (flag_pic && SYMBOLIC_CONST (XEXP (x, 1)))
- {
- changed = 1;
- x = legitimize_pic_address (x, 0);
- }
-
- if (changed && legitimate_address_p (mode, x, FALSE))
- return x;
-
- if (GET_CODE (XEXP (x, 0)) == REG)
- {
- register rtx temp = gen_reg_rtx (Pmode);
- register rtx val = force_operand (XEXP (x, 1), temp);
- if (val != temp)
- emit_move_insn (temp, val);
-
- XEXP (x, 1) = temp;
- return x;
- }
-
- else if (GET_CODE (XEXP (x, 1)) == REG)
- {
- register rtx temp = gen_reg_rtx (Pmode);
- register rtx val = force_operand (XEXP (x, 0), temp);
- if (val != temp)
- emit_move_insn (temp, val);
-
- XEXP (x, 0) = temp;
- return x;
- }
- }
-
- return x;
- }
-
-
- /* Print an integer constant expression in assembler syntax. Addition
- and subtraction are the only arithmetic that may appear in these
- expressions. FILE is the stdio stream to write to, X is the rtx, and
- CODE is the operand print code from the output string. */
-
- static void
- output_pic_addr_const (file, x, code)
- FILE *file;
- rtx x;
- int code;
- {
- char buf[256];
-
- switch (GET_CODE (x))
- {
- case PC:
- if (flag_pic)
- putc ('.', file);
- else
- abort ();
- break;
-
- case SYMBOL_REF:
- case LABEL_REF:
- if (GET_CODE (x) == SYMBOL_REF)
- assemble_name (file, XSTR (x, 0));
- else
- {
- ASM_GENERATE_INTERNAL_LABEL (buf, "L",
- CODE_LABEL_NUMBER (XEXP (x, 0)));
- assemble_name (asm_out_file, buf);
- }
-
- #ifndef MACHO_PIC
- if (GET_CODE (x) == SYMBOL_REF && CONSTANT_POOL_ADDRESS_P (x))
- fprintf (file, "@GOTOFF(%%ebx)");
- else if (code == 'P')
- fprintf (file, "@PLT");
- else if (GET_CODE (x) == LABEL_REF)
- fprintf (file, "@GOTOFF");
- else if (! SYMBOL_REF_FLAG (x))
- fprintf (file, "@GOT");
- else
- fprintf (file, "@GOTOFF");
- #endif
-
- break;
-
- case CODE_LABEL:
- ASM_GENERATE_INTERNAL_LABEL (buf, "L", CODE_LABEL_NUMBER (x));
- assemble_name (asm_out_file, buf);
- break;
-
- case CONST_INT:
- fprintf (file, "%d", INTVAL (x));
- break;
-
- case CONST:
- /* This used to output parentheses around the expression,
- but that does not work on the 386 (either ATT or BSD assembler). */
- output_pic_addr_const (file, XEXP (x, 0), code);
- break;
-
- case CONST_DOUBLE:
- if (GET_MODE (x) == VOIDmode)
- {
- /* We can use %d if the number is <32 bits and positive. */
- if (CONST_DOUBLE_HIGH (x) || CONST_DOUBLE_LOW (x) < 0)
- fprintf (file, "0x%x%08x",
- CONST_DOUBLE_HIGH (x), CONST_DOUBLE_LOW (x));
- else
- fprintf (file, "%d", CONST_DOUBLE_LOW (x));
- }
- else
- /* We can't handle floating point constants;
- PRINT_OPERAND must handle them. */
- output_operand_lossage ("floating constant misused");
- break;
-
- case PLUS:
- /* Some assemblers need integer constants to appear last (eg masm). */
- if (GET_CODE (XEXP (x, 0)) == CONST_INT)
- {
- output_pic_addr_const (file, XEXP (x, 1), code);
- if (INTVAL (XEXP (x, 0)) >= 0)
- fprintf (file, "+");
- output_pic_addr_const (file, XEXP (x, 0), code);
- }
- else
- {
- output_pic_addr_const (file, XEXP (x, 0), code);
- if (INTVAL (XEXP (x, 1)) >= 0)
- fprintf (file, "+");
- output_pic_addr_const (file, XEXP (x, 1), code);
- }
- break;
-
- case MINUS:
- output_pic_addr_const (file, XEXP (x, 0), code);
- fprintf (file, "-");
- output_pic_addr_const (file, XEXP (x, 1), code);
- break;
-
- default:
- output_operand_lossage ("invalid expression as operand");
- }
- }
-
- /* Meaning of CODE:
- f -- float insn (print a CONST_DOUBLE as a float rather than in hex).
- D,L,W,B,Q,S -- print the opcode suffix for specified size of operand.
- R -- print the prefix for register names.
- z -- print the opcode suffix for the size of the current operand.
- * -- print a star (in certain assembler syntax)
- w -- print the operand as if it's a "word" (HImode) even if it isn't.
- c -- don't print special prefixes before constant operands.
- J -- print the appropriate jump operand.
- */
-
- void
- print_operand (file, x, code)
- FILE *file;
- rtx x;
- int code;
- {
- if (code)
- {
- switch (code)
- {
- case '*':
- if (USE_STAR)
- putc ('*', file);
- return;
-
- case 'L':
- PUT_OP_SIZE (code, 'l', file);
- return;
-
- case 'W':
- PUT_OP_SIZE (code, 'w', file);
- return;
-
- case 'B':
- PUT_OP_SIZE (code, 'b', file);
- return;
-
- case 'Q':
- PUT_OP_SIZE (code, 'l', file);
- return;
-
- case 'S':
- PUT_OP_SIZE (code, 's', file);
- return;
-
- case 'T':
- PUT_OP_SIZE (code, 't', file);
- return;
-
- case 'z':
- /* 387 opcodes don't get size suffixes if the operands are
- registers. */
-
- if (STACK_REG_P (x))
- return;
-
- /* this is the size of op from size of operand */
- switch (GET_MODE_SIZE (GET_MODE (x)))
- {
- case 1:
- PUT_OP_SIZE ('B', 'b', file);
- return;
-
- case 2:
- PUT_OP_SIZE ('W', 'w', file);
- return;
-
- case 4:
- if (GET_MODE (x) == SFmode)
- {
- PUT_OP_SIZE ('S', 's', file);
- return;
- }
- else
- PUT_OP_SIZE ('L', 'l', file);
- return;
-
- case 12:
- PUT_OP_SIZE ('T', 't', file);
- return;
-
- case 8:
- if (GET_MODE_CLASS (GET_MODE (x)) == MODE_INT)
- {
- #ifdef GAS_MNEMONICS
- PUT_OP_SIZE ('Q', 'q', file);
- return;
- #else
- PUT_OP_SIZE ('Q', 'l', file); /* Fall through */
- #endif
- }
-
- PUT_OP_SIZE ('Q', 'l', file);
- return;
- }
-
- case 'b':
- case 'w':
- case 'k':
- case 'h':
- case 'y':
- case 'P':
- break;
-
- case 'J':
- switch (GET_CODE (x))
- {
- /* These conditions are appropriate for testing the result
- of an arithmetic operation, not for a compare operation.
- Cases GE, LT assume CC_NO_OVERFLOW true. All cases assume
- CC_Z_IN_NOT_C false and not floating point. */
- case NE: fputs ("jne", file); return;
- case EQ: fputs ("je", file); return;
- case GE: fputs ("jns", file); return;
- case LT: fputs ("js", file); return;
- case GEU: fputs ("jmp", file); return;
- case GTU: fputs ("jne", file); return;
- case LEU: fputs ("je", file); return;
- case LTU: fputs ("#branch never", file); return;
-
- /* no matching branches for GT nor LE */
- }
- abort ();
-
- default:
- {
- char str[50];
-
- sprintf (str, "invalid operand code `%c'", code);
- output_operand_lossage (str);
- }
- }
- }
- if (GET_CODE (x) == REG)
- {
- PRINT_REG (x, code, file);
- }
- else if (GET_CODE (x) == MEM)
- {
- PRINT_PTR (x, file);
- if (CONSTANT_ADDRESS_P (XEXP (x, 0)))
- {
- if (flag_pic)
- output_pic_addr_const (file, XEXP (x, 0), code);
- else
- output_addr_const (file, XEXP (x, 0));
- }
- else
- output_address (XEXP (x, 0));
- }
- else if (GET_CODE (x) == CONST_DOUBLE && GET_MODE (x) == SFmode)
- {
- REAL_VALUE_TYPE r; long l;
- REAL_VALUE_FROM_CONST_DOUBLE (r, x);
- REAL_VALUE_TO_TARGET_SINGLE (r, l);
- PRINT_IMMED_PREFIX (file);
- fprintf (file, "0x%x", l);
- }
- /* These float cases don't actually occur as immediate operands. */
- else if (GET_CODE (x) == CONST_DOUBLE && GET_MODE (x) == DFmode)
- {
- REAL_VALUE_TYPE r; char dstr[30];
- REAL_VALUE_FROM_CONST_DOUBLE (r, x);
- REAL_VALUE_TO_DECIMAL (r, "%.22e", dstr);
- fprintf (file, "%s", dstr);
- }
- else if (GET_CODE (x) == CONST_DOUBLE && GET_MODE (x) == XFmode)
- {
- REAL_VALUE_TYPE r; char dstr[30];
- REAL_VALUE_FROM_CONST_DOUBLE (r, x);
- REAL_VALUE_TO_DECIMAL (r, "%.22e", dstr);
- fprintf (file, "%s", dstr);
- }
- else
- {
- if (code != 'P')
- {
- if (GET_CODE (x) == CONST_INT || GET_CODE (x) == CONST_DOUBLE)
- PRINT_IMMED_PREFIX (file);
- else if (GET_CODE (x) == CONST || GET_CODE (x) == SYMBOL_REF
- || GET_CODE (x) == LABEL_REF)
- PRINT_OFFSET_PREFIX (file);
- }
- if (flag_pic)
- output_pic_addr_const (file, x, code);
- else
- output_addr_const (file, x);
- }
- }
-
- /* Print a memory operand whose address is ADDR. */
-
- void
- print_operand_address (file, addr)
- FILE *file;
- register rtx addr;
- {
- register rtx reg1, reg2, breg, ireg;
- rtx offset;
-
- switch (GET_CODE (addr))
- {
- case REG:
- ADDR_BEG (file);
- fprintf (file, "%se", RP);
- fputs (hi_reg_name[REGNO (addr)], file);
- ADDR_END (file);
- break;
-
- case PLUS:
- reg1 = 0;
- reg2 = 0;
- ireg = 0;
- breg = 0;
- offset = 0;
- if (CONSTANT_ADDRESS_P (XEXP (addr, 0)))
- {
- offset = XEXP (addr, 0);
- addr = XEXP (addr, 1);
- }
- else if (CONSTANT_ADDRESS_P (XEXP (addr, 1)))
- {
- offset = XEXP (addr, 1);
- addr = XEXP (addr, 0);
- }
- if (GET_CODE (addr) != PLUS) ;
- else if (GET_CODE (XEXP (addr, 0)) == MULT)
- {
- reg1 = XEXP (addr, 0);
- addr = XEXP (addr, 1);
- }
- else if (GET_CODE (XEXP (addr, 1)) == MULT)
- {
- reg1 = XEXP (addr, 1);
- addr = XEXP (addr, 0);
- }
- else if (GET_CODE (XEXP (addr, 0)) == REG)
- {
- reg1 = XEXP (addr, 0);
- addr = XEXP (addr, 1);
- }
- else if (GET_CODE (XEXP (addr, 1)) == REG)
- {
- reg1 = XEXP (addr, 1);
- addr = XEXP (addr, 0);
- }
- if (GET_CODE (addr) == REG || GET_CODE (addr) == MULT)
- {
- if (reg1 == 0) reg1 = addr;
- else reg2 = addr;
- addr = 0;
- }
- if (offset != 0)
- {
- if (addr != 0) abort ();
- addr = offset;
- }
- if ((reg1 && GET_CODE (reg1) == MULT)
- || (reg2 != 0 && REGNO_OK_FOR_BASE_P (REGNO (reg2))))
- {
- breg = reg2;
- ireg = reg1;
- }
- else if (reg1 != 0 && REGNO_OK_FOR_BASE_P (REGNO (reg1)))
- {
- breg = reg1;
- ireg = reg2;
- }
-
- if (ireg != 0 || breg != 0)
- {
- int scale = 1;
-
- if (addr != 0)
- {
- if (flag_pic)
- output_pic_addr_const (file, addr, 0);
-
- else if (GET_CODE (addr) == LABEL_REF)
- output_asm_label (addr);
-
- else
- output_addr_const (file, addr);
- }
-
- if (ireg != 0 && GET_CODE (ireg) == MULT)
- {
- scale = INTVAL (XEXP (ireg, 1));
- ireg = XEXP (ireg, 0);
- }
-
- /* The stack pointer can only appear as a base register,
- never an index register, so exchange the regs if it is wrong. */
-
- if (scale == 1 && ireg && REGNO (ireg) == STACK_POINTER_REGNUM)
- {
- rtx tmp;
-
- tmp = breg;
- breg = ireg;
- ireg = tmp;
- }
-
- /* output breg+ireg*scale */
- PRINT_B_I_S (breg, ireg, scale, file);
- break;
- }
-
- case MULT:
- {
- int scale;
- if (GET_CODE (XEXP (addr, 0)) == CONST_INT)
- {
- scale = INTVAL (XEXP (addr, 0));
- ireg = XEXP (addr, 1);
- }
- else
- {
- scale = INTVAL (XEXP (addr, 1));
- ireg = XEXP (addr, 0);
- }
- output_addr_const (file, const0_rtx);
- PRINT_B_I_S ((rtx) 0, ireg, scale, file);
- }
- break;
-
- default:
- if (GET_CODE (addr) == CONST_INT
- && INTVAL (addr) < 0x8000
- && INTVAL (addr) >= -0x8000)
- fprintf (file, "%d", INTVAL (addr));
- else
- {
- if (flag_pic)
- output_pic_addr_const (file, addr, 0);
- else
- output_addr_const (file, addr);
- }
- }
- }
-
- /* Set the cc_status for the results of an insn whose pattern is EXP.
- On the 80386, we assume that only test and compare insns, as well
- as SI, HI, & DI mode ADD, SUB, NEG, AND, IOR, XOR, ASHIFT,
- ASHIFTRT, and LSHIFTRT instructions set the condition codes usefully.
- Also, we assume that jumps, moves and sCOND don't affect the condition
- codes. All else clobbers the condition codes, by assumption.
-
- We assume that ALL integer add, minus, etc. instructions effect the
- condition codes. This MUST be consistent with i386.md.
-
- We don't record any float test or compare - the redundant test &
- compare check in final.c does not handle stack-like regs correctly. */
-
- void
- notice_update_cc (exp)
- rtx exp;
- {
- if (GET_CODE (exp) == SET)
- {
- /* Jumps do not alter the cc's. */
- if (SET_DEST (exp) == pc_rtx)
- return;
- /* Moving register or memory into a register:
- it doesn't alter the cc's, but it might invalidate
- the RTX's which we remember the cc's came from.
- (Note that moving a constant 0 or 1 MAY set the cc's). */
- if (REG_P (SET_DEST (exp))
- && (REG_P (SET_SRC (exp)) || GET_CODE (SET_SRC (exp)) == MEM
- || GET_RTX_CLASS (GET_CODE (SET_SRC (exp))) == '<'))
- {
- if (cc_status.value1
- && reg_overlap_mentioned_p (SET_DEST (exp), cc_status.value1))
- cc_status.value1 = 0;
- if (cc_status.value2
- && reg_overlap_mentioned_p (SET_DEST (exp), cc_status.value2))
- cc_status.value2 = 0;
- return;
- }
- /* Moving register into memory doesn't alter the cc's.
- It may invalidate the RTX's which we remember the cc's came from. */
- if (GET_CODE (SET_DEST (exp)) == MEM
- && (REG_P (SET_SRC (exp))
- || GET_RTX_CLASS (GET_CODE (SET_SRC (exp))) == '<'))
- {
- if (cc_status.value1 && GET_CODE (cc_status.value1) == MEM)
- cc_status.value1 = 0;
- if (cc_status.value2 && GET_CODE (cc_status.value2) == MEM)
- cc_status.value2 = 0;
- return;
- }
- /* Function calls clobber the cc's. */
- else if (GET_CODE (SET_SRC (exp)) == CALL)
- {
- CC_STATUS_INIT;
- return;
- }
- /* Tests and compares set the cc's in predictable ways. */
- else if (SET_DEST (exp) == cc0_rtx)
- {
- CC_STATUS_INIT;
- cc_status.value1 = SET_SRC (exp);
- return;
- }
- /* Certain instructions effect the condition codes. */
- else if (GET_MODE (SET_SRC (exp)) == SImode
- || GET_MODE (SET_SRC (exp)) == HImode
- || GET_MODE (SET_SRC (exp)) == QImode)
- switch (GET_CODE (SET_SRC (exp)))
- {
- case ASHIFTRT: case LSHIFTRT:
- case ASHIFT:
- /* Shifts on the 386 don't set the condition codes if the
- shift count is zero. */
- if (GET_CODE (XEXP (SET_SRC (exp), 1)) != CONST_INT)
- {
- CC_STATUS_INIT;
- break;
- }
- /* We assume that the CONST_INT is non-zero (this rtx would
- have been deleted if it were zero. */
-
- case PLUS: case MINUS: case NEG:
- case AND: case IOR: case XOR:
- cc_status.flags = CC_NO_OVERFLOW;
- cc_status.value1 = SET_SRC (exp);
- cc_status.value2 = SET_DEST (exp);
- break;
-
- default:
- CC_STATUS_INIT;
- }
- else
- {
- CC_STATUS_INIT;
- }
- }
- else if (GET_CODE (exp) == PARALLEL
- && GET_CODE (XVECEXP (exp, 0, 0)) == SET)
- {
- if (SET_DEST (XVECEXP (exp, 0, 0)) == pc_rtx)
- return;
- if (SET_DEST (XVECEXP (exp, 0, 0)) == cc0_rtx)
- {
- CC_STATUS_INIT;
- if (stack_regs_mentioned_p (SET_SRC (XVECEXP (exp, 0, 0))))
- cc_status.flags |= CC_IN_80387;
- else
- cc_status.value1 = SET_SRC (XVECEXP (exp, 0, 0));
- return;
- }
- CC_STATUS_INIT;
- }
- else
- {
- CC_STATUS_INIT;
- }
- }
-
- /* Split one or more DImode RTL references into pairs of SImode
- references. The RTL can be REG, offsettable MEM, integer constant, or
- CONST_DOUBLE. "operands" is a pointer to an array of DImode RTL to
- split and "num" is its length. lo_half and hi_half are output arrays
- that parallel "operands". */
-
- void
- split_di (operands, num, lo_half, hi_half)
- rtx operands[];
- int num;
- rtx lo_half[], hi_half[];
- {
- while (num--)
- {
- if (GET_CODE (operands[num]) == REG)
- {
- lo_half[num] = gen_rtx (REG, SImode, REGNO (operands[num]));
- hi_half[num] = gen_rtx (REG, SImode, REGNO (operands[num]) + 1);
- }
- else if (CONSTANT_P (operands[num]))
- {
- split_double (operands[num], &lo_half[num], &hi_half[num]);
- }
- else if (offsettable_memref_p (operands[num]))
- {
- lo_half[num] = operands[num];
- hi_half[num] = adj_offsettable_operand (operands[num], 4);
- }
- else
- abort();
- }
- }
-
- /* Return 1 if this is a valid binary operation on a 387.
- OP is the expression matched, and MODE is its mode. */
-
- int
- binary_387_op (op, mode)
- register rtx op;
- enum machine_mode mode;
- {
- if (mode != VOIDmode && mode != GET_MODE (op))
- return 0;
-
- switch (GET_CODE (op))
- {
- case PLUS:
- case MINUS:
- case MULT:
- case DIV:
- return GET_MODE_CLASS (GET_MODE (op)) == MODE_FLOAT;
-
- default:
- return 0;
- }
- }
-
-
- /* Return 1 if this is a valid shift or rotate operation on a 386.
- OP is the expression matched, and MODE is its mode. */
-
- int
- shift_op (op, mode)
- register rtx op;
- enum machine_mode mode;
- {
- rtx operand = XEXP (op, 0);
-
- if (mode != VOIDmode && mode != GET_MODE (op))
- return 0;
-
- if (GET_MODE (operand) != GET_MODE (op)
- || GET_MODE_CLASS (GET_MODE (op)) != MODE_INT)
- return 0;
-
- return (GET_CODE (op) == ASHIFT
- || GET_CODE (op) == ASHIFTRT
- || GET_CODE (op) == LSHIFTRT
- || GET_CODE (op) == ROTATE
- || GET_CODE (op) == ROTATERT);
- }
-
- /* Return 1 if OP is COMPARE rtx with mode VOIDmode.
- MODE is not used. */
-
- int
- VOIDmode_compare_op (op, mode)
- register rtx op;
- enum machine_mode mode;
- {
- return GET_CODE (op) == COMPARE && GET_MODE (op) == VOIDmode;
- }
-
- /* Output code to perform a 387 binary operation in INSN, one of PLUS,
- MINUS, MULT or DIV. OPERANDS are the insn operands, where operands[3]
- is the expression of the binary operation. The output may either be
- emitted here, or returned to the caller, like all output_* functions.
-
- There is no guarantee that the operands are the same mode, as they
- might be within FLOAT or FLOAT_EXTEND expressions. */
-
- char *
- output_387_binary_op (insn, operands)
- rtx insn;
- rtx *operands;
- {
- rtx temp;
- char *base_op;
- static char buf[100];
-
- switch (GET_CODE (operands[3]))
- {
- case PLUS:
- if (GET_MODE_CLASS (GET_MODE (operands[1])) == MODE_INT
- || GET_MODE_CLASS (GET_MODE (operands[2])) == MODE_INT)
- base_op = "fiadd";
- else
- base_op = "fadd";
- break;
-
- case MINUS:
- if (GET_MODE_CLASS (GET_MODE (operands[1])) == MODE_INT
- || GET_MODE_CLASS (GET_MODE (operands[2])) == MODE_INT)
- base_op = "fisub";
- else
- base_op = "fsub";
- break;
-
- case MULT:
- if (GET_MODE_CLASS (GET_MODE (operands[1])) == MODE_INT
- || GET_MODE_CLASS (GET_MODE (operands[2])) == MODE_INT)
- base_op = "fimul";
- else
- base_op = "fmul";
- break;
-
- case DIV:
- if (GET_MODE_CLASS (GET_MODE (operands[1])) == MODE_INT
- || GET_MODE_CLASS (GET_MODE (operands[2])) == MODE_INT)
- base_op = "fidiv";
- else
- base_op = "fdiv";
- break;
-
- default:
- abort ();
- }
-
- strcpy (buf, base_op);
-
- switch (GET_CODE (operands[3]))
- {
- case MULT:
- case PLUS:
- if (REG_P (operands[2]) && REGNO (operands[0]) == REGNO (operands[2]))
- {
- temp = operands[2];
- operands[2] = operands[1];
- operands[1] = temp;
- }
-
- if (GET_CODE (operands[2]) == MEM)
- return strcat (buf, AS1 (%z2,%2));
-
- if (NON_STACK_REG_P (operands[1]))
- {
- output_op_from_reg (operands[1], strcat (buf, AS1 (%z0,%1)));
- RET;
- }
- else if (NON_STACK_REG_P (operands[2]))
- {
- output_op_from_reg (operands[2], strcat (buf, AS1 (%z0,%1)));
- RET;
- }
-
- if (find_regno_note (insn, REG_DEAD, REGNO (operands[2])))
- return strcat (buf, AS2 (p,%2,%0));
-
- if (STACK_TOP_P (operands[0]))
- return strcat (buf, AS2C (%y2,%0));
- else
- return strcat (buf, AS2C (%2,%0));
-
- case MINUS:
- case DIV:
- if (GET_CODE (operands[1]) == MEM)
- return strcat (buf, AS1 (r%z1,%1));
-
- if (GET_CODE (operands[2]) == MEM)
- return strcat (buf, AS1 (%z2,%2));
-
- if (NON_STACK_REG_P (operands[1]))
- {
- output_op_from_reg (operands[1], strcat (buf, AS1 (r%z0,%1)));
- RET;
- }
- else if (NON_STACK_REG_P (operands[2]))
- {
- output_op_from_reg (operands[2], strcat (buf, AS1 (%z0,%1)));
- RET;
- }
-
- if (! STACK_REG_P (operands[1]) || ! STACK_REG_P (operands[2]))
- abort ();
-
- if (find_regno_note (insn, REG_DEAD, REGNO (operands[2])))
- return strcat (buf, AS2 (rp,%2,%0));
-
- if (find_regno_note (insn, REG_DEAD, REGNO (operands[1])))
- return strcat (buf, AS2 (p,%1,%0));
-
- if (STACK_TOP_P (operands[0]))
- {
- if (STACK_TOP_P (operands[1]))
- return strcat (buf, AS2C (%y2,%0));
- else
- return strcat (buf, AS2 (r,%y1,%0));
- }
- else if (STACK_TOP_P (operands[1]))
- return strcat (buf, AS2C (%1,%0));
- else
- return strcat (buf, AS2 (r,%2,%0));
-
- default:
- abort ();
- }
- }
-
- /* Output code for INSN to convert a float to a signed int. OPERANDS
- are the insn operands. The output may be SFmode or DFmode and the
- input operand may be SImode or DImode. As a special case, make sure
- that the 387 stack top dies if the output mode is DImode, because the
- hardware requires this. */
-
- char *
- output_fix_trunc (insn, operands)
- rtx insn;
- rtx *operands;
- {
- int stack_top_dies = find_regno_note (insn, REG_DEAD, FIRST_STACK_REG) != 0;
- rtx xops[2];
-
- if (! STACK_TOP_P (operands[1]) ||
- (GET_MODE (operands[0]) == DImode && ! stack_top_dies))
- abort ();
-
- xops[0] = GEN_INT (12);
- xops[1] = operands[4];
-
- output_asm_insn (AS1 (fnstc%W2,%2), operands);
- output_asm_insn (AS2 (mov%L2,%2,%4), operands);
- output_asm_insn (AS2 (mov%B1,%0,%h1), xops);
- output_asm_insn (AS2 (mov%L4,%4,%3), operands);
- output_asm_insn (AS1 (fldc%W3,%3), operands);
-
- if (NON_STACK_REG_P (operands[0]))
- output_to_reg (operands[0], stack_top_dies);
- else if (GET_CODE (operands[0]) == MEM)
- {
- if (stack_top_dies)
- output_asm_insn (AS1 (fistp%z0,%0), operands);
- else
- output_asm_insn (AS1 (fist%z0,%0), operands);
- }
- else
- abort ();
-
- return AS1 (fldc%W2,%2);
- }
-
- /* Output code for INSN to compare OPERANDS. The two operands might
- not have the same mode: one might be within a FLOAT or FLOAT_EXTEND
- expression. If the compare is in mode CCFPEQmode, use an opcode that
- will not fault if a qNaN is present. */
-
- char *
- output_float_compare (insn, operands)
- rtx insn;
- rtx *operands;
- {
- int stack_top_dies;
- rtx body = XVECEXP (PATTERN (insn), 0, 0);
- int unordered_compare = GET_MODE (SET_SRC (body)) == CCFPEQmode;
-
- if (! STACK_TOP_P (operands[0]))
- abort ();
-
- stack_top_dies = find_regno_note (insn, REG_DEAD, FIRST_STACK_REG) != 0;
-
- if (STACK_REG_P (operands[1])
- && stack_top_dies
- && find_regno_note (insn, REG_DEAD, REGNO (operands[1]))
- && REGNO (operands[1]) != FIRST_STACK_REG)
- {
- /* If both the top of the 387 stack dies, and the other operand
- is also a stack register that dies, then this must be a
- `fcompp' float compare */
-
- if (unordered_compare)
- output_asm_insn ("fucompp", operands);
- else
- output_asm_insn ("fcompp", operands);
- }
- else
- {
- static char buf[100];
-
- /* Decide if this is the integer or float compare opcode, or the
- unordered float compare. */
-
- if (unordered_compare)
- strcpy (buf, "fucom");
- else if (GET_MODE_CLASS (GET_MODE (operands[1])) == MODE_FLOAT)
- strcpy (buf, "fcom");
- else
- strcpy (buf, "ficom");
-
- /* Modify the opcode if the 387 stack is to be popped. */
-
- if (stack_top_dies)
- strcat (buf, "p");
-
- if (NON_STACK_REG_P (operands[1]))
- output_op_from_reg (operands[1], strcat (buf, AS1 (%z0,%1)));
- else
- output_asm_insn (strcat (buf, AS1 (%z1,%y1)), operands);
- }
-
- /* Now retrieve the condition code. */
-
- return output_fp_cc0_set (insn);
- }
-
- /* Output opcodes to transfer the results of FP compare or test INSN
- from the FPU to the CPU flags. If TARGET_IEEE_FP, ensure that if the
- result of the compare or test is unordered, no comparison operator
- succeeds except NE. Return an output template, if any. */
-
- char *
- output_fp_cc0_set (insn)
- rtx insn;
- {
- rtx xops[3];
- rtx unordered_label;
- rtx next;
- enum rtx_code code;
-
- #ifdef NEXT_SEMANTICS
- next = next_cc0_user (insn);
-
- /* a fpcc_switch instruction may have been inserted
- here. In that case, we need to actually output that
- insn before we do the comparison below. */
- if (next == NULL_RTX && flag_fppc)
- {
- next = next_nonnote_insn (insn);
-
- if (next && GET_CODE (next) == INSN
- && INSN_CODE (next) == CODE_FOR_fppc_switch)
- {
- /* output the fppc_switch insn in `next' here! */
- /*
- xops[0] = XVECEXP (PATTERN (next), 0, 0);
- if (insn_template [CODE_FOR_fppc_switch])
- {
- output_asm_insn (insn_template[CODE_FOR_fppc_switch], xops);
- }
- else
- abort ();
- */
- next = next_cc0_user (next);
- }
- }
- #endif
-
- xops[0] = gen_rtx (REG, HImode, 0);
- output_asm_insn (AS1 (fnsts%W0,%0), xops);
-
- if (! TARGET_IEEE_FP)
- return "sahf";
-
- #ifndef NEXT_SEMANTICS
- next = next_cc0_user (insn);
- #endif
- if (next == NULL_RTX)
- abort ();
-
- if (GET_CODE (next) == JUMP_INSN
- && GET_CODE (PATTERN (next)) == SET
- && SET_DEST (PATTERN (next)) == pc_rtx
- && GET_CODE (SET_SRC (PATTERN (next))) == IF_THEN_ELSE)
- {
- code = GET_CODE (XEXP (SET_SRC (PATTERN (next)), 0));
- }
- else if (GET_CODE (PATTERN (next)) == SET)
- {
- code = GET_CODE (SET_SRC (PATTERN (next)));
- }
- else
- abort ();
-
- xops[0] = gen_rtx (REG, QImode, 0);
-
- switch (code)
- {
- case GT:
- xops[1] = GEN_INT (0x45);
- output_asm_insn (AS2 (and%B0,%1,%h0), xops);
- /* je label */
- break;
-
- case LT:
- xops[1] = GEN_INT (0x45);
- xops[2] = GEN_INT (0x01);
- output_asm_insn (AS2 (and%B0,%1,%h0), xops);
- output_asm_insn (AS2 (cmp%B0,%2,%h0), xops);
- /* je label */
- break;
-
- case GE:
- xops[1] = GEN_INT (0x05);
- output_asm_insn (AS2 (and%B0,%1,%h0), xops);
- /* je label */
- break;
-
- case LE:
- xops[1] = GEN_INT (0x45);
- xops[2] = GEN_INT (0x40);
- output_asm_insn (AS2 (and%B0,%1,%h0), xops);
- output_asm_insn (AS1 (dec%B0,%h0), xops);
- output_asm_insn (AS2 (cmp%B0,%2,%h0), xops);
- /* jb label */
- break;
-
- case EQ:
- xops[1] = GEN_INT (0x45);
- xops[2] = GEN_INT (0x40);
- output_asm_insn (AS2 (and%B0,%1,%h0), xops);
- output_asm_insn (AS2 (cmp%B0,%2,%h0), xops);
- /* je label */
- break;
-
- case NE:
- xops[1] = GEN_INT (0x44);
- xops[2] = GEN_INT (0x40);
- output_asm_insn (AS2 (and%B0,%1,%h0), xops);
- output_asm_insn (AS2 (xor%B0,%2,%h0), xops);
- /* jne label */
- break;
-
- case GTU:
- case LTU:
- case GEU:
- case LEU:
- default:
- abort ();
- }
- RET;
- }
-
- #ifdef MACHO_PIC
- #define MAX_386_STACK_LOCALS 3
- #else
- #define MAX_386_STACK_LOCALS 2
- #endif
-
- static rtx i386_stack_locals[(int) MAX_MACHINE_MODE][MAX_386_STACK_LOCALS];
-
- /* Define the structure for the machine field in struct function. */
- struct machine_function
- {
- rtx i386_stack_locals[(int) MAX_MACHINE_MODE][MAX_386_STACK_LOCALS];
- };
-
- /* Functions to save and restore i386_stack_locals.
- These will be called, via pointer variables,
- from push_function_context and pop_function_context. */
-
- void
- save_386_machine_status (p)
- struct function *p;
- {
- p->machine = (struct machine_function *) xmalloc (sizeof i386_stack_locals);
- bcopy ((char *) i386_stack_locals, (char *) p->machine->i386_stack_locals,
- sizeof i386_stack_locals);
- }
-
- void
- restore_386_machine_status (p)
- struct function *p;
- {
- bcopy ((char *) p->machine->i386_stack_locals, (char *) i386_stack_locals,
- sizeof i386_stack_locals);
- free (p->machine);
- }
-
- /* Clear stack slot assignments remembered from previous functions.
- This is called from INIT_EXPANDERS once before RTL is emitted for each
- function. */
-
- void
- clear_386_stack_locals ()
- {
- enum machine_mode mode;
- int n;
-
- for (mode = VOIDmode; (int) mode < (int) MAX_MACHINE_MODE;
- mode = (enum machine_mode) ((int) mode + 1))
- for (n = 0; n < MAX_386_STACK_LOCALS; n++)
- i386_stack_locals[(int) mode][n] = NULL_RTX;
-
- /* Arrange to save and restore i386_stack_locals around nested functions. */
- save_machine_status = save_386_machine_status;
- restore_machine_status = restore_386_machine_status;
- }
-
- /* Return a MEM corresponding to a stack slot with mode MODE.
- Allocate a new slot if necessary.
-
- The RTL for a function can have several slots available: N is
- which slot to use. */
-
- rtx
- assign_386_stack_local (mode, n)
- enum machine_mode mode;
- int n;
- {
- if (n < 0 || n >= MAX_386_STACK_LOCALS)
- abort ();
-
- if (i386_stack_locals[(int) mode][n] == NULL_RTX)
- i386_stack_locals[(int) mode][n]
- = assign_stack_local (mode, GET_MODE_SIZE (mode), 0);
-
- return i386_stack_locals[(int) mode][n];
- }
-
- #ifdef NEXT_SEMANTICS
- static rtx
- lookup_i386_stack_local (mode, n)
- enum machine_mode mode;
- int n;
- {
- if (n < 0 || n >= MAX_386_STACK_LOCALS)
- abort ();
-
- return i386_stack_locals[(int) mode][n];
- }
- #endif
-