home *** CD-ROM | disk | FTP | other *** search
-
- #ifdef __GNUC__
- /* so have assembler macros */
- /* Normally gcc for the 386 only allows 4 operands to an asm,
- however we need 5 for divul. You can easily make gcc accept
- more by changing one line in genconfig.c and then recompiling gcc
-
- printf ("\n#define MAX_RECOG_OPERANDS %d\n", max_recog_operands_flag + 3);
-
- */
- /* divul
- rem=hl; f=divul(x,y,rem);
- then
- hl:x == f*y + rem is true */
-
- #define divul(x,y,hiremainder) \
- ({ulong __x =(x),__y=(y); \
- asm volatile("divl %3" \
- :"=a" (__x),"=d" (hiremainder) \
- :"0" (__x),"rm"(__y),"1" (hiremainder) ); \
- __x;})
-
-
- /* mulul is a macro:
- f = mulul(a,b,h) <--> h:f == a*b
- */
-
- #define mulul(x,y,hiremainder) \
- ({ulong __x =(x),__y=(y); \
- asm volatile("mull %3" \
- :"=a" (__x),"=d" (hiremainder) \
- :"0" (__x),"rm"(__y)); \
- __x;})
-
-
- /* add_carry: add X and Y adding 1 to H if there was overflow
- H is presumed to be small enough not to overflow
- */
-
- #define add_carry(x,y,h) \
- ({ulong __res ; \
- asm volatile("addl %4,%1\n\tadcl $0,%0" \
- :"=rm,rm" (h),"=r,m" (__res): "0,0" (h),"1,1" (x),"rmn,r"(y)); \
- __res;})
-
-
- /* SET_MACHINE_CARRYSet the machine carry flag
- if overflow = 1 other wise clear it.
- */
-
- #define SET_MACHINE_CARRY(overflow) \
- asm volatile("addl $-1,%0" : "=r" (overflow) : "0" (overflow))
-
-
- /* SET_OVERFLOW Set the overflow = the current carry code
- Note that machine loads and mov's should not affect
- the carry code.
- */
-
- #define SET_OVERFLOW \
- asm volatile("movl $0,%0\n\tadcl $0,%0" \
- : "=rm" (overflow))
-
- /* x - y */
- #define SUBXCC(xp,yp)\
- ({unsigned long _res; asm volatile("sbbl %2,%0" \
- :"=r,rm" (_res): "0,0" (xp) , "rm,r" (yp)); _res;})
-
- #define ADDXCC(xp,yp)\
- ({unsigned long _res; asm volatile("adcl %2,%0" \
- :"=r,m" (_res): "0,0" (xp) , "rm,r" (yp)); _res;})
-
- /* index of the first non zero bit numbering from left */
- /* don't think there is an instruction.
- #define bfffo(x) \
- ({ulong _res; asm ("bfffo %1{#0:#0},%0" : "=r" (_res): "rm" (x)); _res;})
- */
-
- #define NEED_MULUL3
- #define NEED_DIVUL3
-
- #else /* not gcc */
-
- #endif
-
-
-
-
- #define BASE_COUNTER 0
-