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- /* This file contains the definitions and documentation for the
- machine modes used in the the GNU compiler.
- Copyright (C) 1987 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 1, 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, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
-
- /* This file defines all the MACHINE MODES used by GNU CC.
-
- A machine mode specifies a size and format of data
- at the machine level.
-
- Each RTL expression has a machine mode.
-
- At the syntax tree level, each ..._TYPE and each ..._DECL node
- has a machine mode which describes data of that type or the
- data of the variable declared. */
-
- /* The first argument is the internal name of the machine mode
- used in the C source.
- By convention these are in UPPER_CASE, except for the word "mode".
-
- The second argument is the name of the machine mode in the
- external ASCII format used for reading and printing RTL and trees.
- By convention these names in UPPER_CASE.
-
- Third argument states the kind of representation:
- MODE_INT - integer
- MODE_FLOAT - floating
- MODE_COMPLEX_INT - pair of integers
- MODE_COMPLEX_FLOAT - pair of floats
- MODE_FUNCTION - Algol or Pascal function-variable incl. static chain
- MODE_RANDOM - anything else
-
- Fourth argument is the relative size of the object.
- It is zero when the size is meaningless or not determined.
- On most machines, this is also the actual size in bytes.
- However, the general rule is that the size of SImode in bytes
- is UNITS_PER_WORD and the other sizes are proportional to that.
- (If UNITS_PER_WORD is less than 4, some modes would be less than
- one byte. Their sizes are rounded up to 1.)
-
- Fifth arg is the relative size of subunits of the object.
- It is same as the fourth argument except for complexes and EPmode,
- since they are really made of two equal size subunits.
-
- Sixth arg is next wider natural mode of the same class,
- for widening multiply and narrowing divide. 0 if there is none. */
-
- /* The compiler assumes that a mode may be widened to another
- HIGHER NUMBERED mode if both those modes AND ALL MODES IN BETWEEN
- are in the same mode class. Thus, you must should assign all
- MODE_INT and MODE_FLOAT modes in separate contiguous blocks. */
-
- /* VOIDmode is used when no mode needs to be specified,
- as for example on CONST_INT RTL expressions. */
- DEF_MACHMODE (VOIDmode, "VOID", MODE_RANDOM, 0, 0, 0)
-
- DEF_MACHMODE (QImode, "QI", MODE_INT, 1, 1, HImode) /* int types */
- DEF_MACHMODE (HImode, "HI", MODE_INT, 2, 2, SImode)
- /* Pointers on some machines use this type to distinguish them from ints.
- Useful if a pointer is 4 bytes but has some bits that are not significant,
- so it is really not quite as wide as an integer. */
- DEF_MACHMODE (PSImode, "PSI", MODE_INT, 4, 4, 0)
- DEF_MACHMODE (SImode, "SI", MODE_INT, 4, 4, DImode)
- DEF_MACHMODE (PDImode, "PDI", MODE_INT, 8, 8, 0)
- DEF_MACHMODE (DImode, "DI", MODE_INT, 8, 8, TImode)
- DEF_MACHMODE (TImode, "TI", MODE_INT, 16, 16, 0)
- DEF_MACHMODE (QFmode, "QF", MODE_FLOAT, 1, 1, 0)
- DEF_MACHMODE (HFmode, "HF", MODE_FLOAT, 2, 2, 0) /* floating types */
- DEF_MACHMODE (SFmode, "SF", MODE_FLOAT, 4, 4, 0)
- DEF_MACHMODE (DFmode, "DF", MODE_FLOAT, 8, 8, 0)
- DEF_MACHMODE (XFmode, "XF", MODE_FLOAT, 12, 12, 0) /* IEEE extended float */
- DEF_MACHMODE (TFmode, "TF", MODE_FLOAT, 16, 16, 0)
- DEF_MACHMODE (CQImode, "CQI", MODE_COMPLEX_INT, 2, 1, 0)
- DEF_MACHMODE (CHImode, "CHI", MODE_COMPLEX_INT, 4, 2, 0) /* complex ints */
- DEF_MACHMODE (CSImode, "CSI", MODE_COMPLEX_INT, 8, 4, 0)
- DEF_MACHMODE (CDImode, "CDI", MODE_COMPLEX_INT, 16, 8, 0)
- DEF_MACHMODE (CTImode, "CTI", MODE_COMPLEX_INT, 32, 16, 0)
- DEF_MACHMODE (CQFmode, "CQF", MODE_COMPLEX_FLOAT, 2, 1, 0)
- DEF_MACHMODE (CHFmode, "CHF", MODE_COMPLEX_FLOAT, 4, 2, 0) /* complex floats */
- DEF_MACHMODE (CSFmode, "CSF", MODE_COMPLEX_FLOAT, 8, 4, 0)
- DEF_MACHMODE (CDFmode, "CDF", MODE_COMPLEX_FLOAT, 16, 8, 0)
- DEF_MACHMODE (CXFmode, "CXF", MODE_COMPLEX_FLOAT, 24, 12, 0)
- DEF_MACHMODE (CTFmode, "CTF", MODE_COMPLEX_FLOAT, 32, 16, 0)
-
- /* BImode is used only in FIELD_DECL nodes for bit fields
- whose size and alignment are not such as to fit any other mode. */
- DEF_MACHMODE (BImode, "BI", MODE_INT, 0, 0, 0) /* signed bit field */
-
- /* BLKmode is used for structures, arrays, etc.
- that fit no more specific mode. */
- DEF_MACHMODE (BLKmode, "BLK", MODE_RANDOM, 0, 0, 0)
-
- /* Function-variable that includes a static chain. */
- DEF_MACHMODE (EPmode, "EP", MODE_RANDOM, 8, 4, 0)
-
- /* The symbol Pmode stands for one of the above machine modes (usually SImode).
- The tm file specifies which one. It is not a distinct mode. */
-
- /*
- Local variables:
- mode:c
- version-control: t
- End:
- */
-