107 lines
4.2 KiB
Modula-2
107 lines
4.2 KiB
Modula-2
/* This file contains the definitions and documentation for the
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machine modes used in the the GNU compiler.
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Copyright (C) 1987-1990 Free Software Foundation, Inc.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* This file defines all the MACHINE MODES used by GNU CC.
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A machine mode specifies a size and format of data
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at the machine level.
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Each RTL expression has a machine mode.
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At the syntax tree level, each ..._TYPE and each ..._DECL node
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has a machine mode which describes data of that type or the
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data of the variable declared. */
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/* The first argument is the internal name of the machine mode
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used in the C source.
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By convention these are in UPPER_CASE, except for the word "mode".
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The second argument is the name of the machine mode in the
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external ASCII format used for reading and printing RTL and trees.
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By convention these names in UPPER_CASE.
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Third argument states the kind of representation:
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MODE_INT - integer
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MODE_FLOAT - floating
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MODE_PARTIAL_INT - PSImode and PDImode
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MODE_CC - modes used for representing the condition code in a register
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MODE_COMPLEX_INT, MODE_COMPLEX_FLOAT - complex number
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MODE_RANDOM - anything else
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Fourth argument is the relative size of the object, in bytes.
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It is zero when the size is meaningless or not determined.
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A byte's size is determined by BITS_PER_UNIT in tm.h.
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Fifth arg is the relative size of subunits of the object.
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It is same as the fourth argument except for complexes,
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since they are really made of two equal size subunits.
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Sixth arg is next wider natural mode of the same class.
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0 if there is none. */
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/* VOIDmode is used when no mode needs to be specified,
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as for example on CONST_INT RTL expressions. */
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DEF_MACHMODE (VOIDmode, "VOID", MODE_RANDOM, 0, 0, VOIDmode)
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DEF_MACHMODE (QImode, "QI", MODE_INT, 1, 1, HImode) /* int types */
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DEF_MACHMODE (HImode, "HI", MODE_INT, 2, 2, SImode)
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/* Pointers on some machines use this type to distinguish them from ints.
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Useful if a pointer is 4 bytes but has some bits that are not significant,
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so it is really not quite as wide as an integer. */
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DEF_MACHMODE (PSImode, "PSI", MODE_PARTIAL_INT, 4, 4, VOIDmode)
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DEF_MACHMODE (SImode, "SI", MODE_INT, 4, 4, DImode)
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DEF_MACHMODE (PDImode, "PDI", MODE_PARTIAL_INT, 8, 8, VOIDmode)
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DEF_MACHMODE (DImode, "DI", MODE_INT, 8, 8, TImode)
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DEF_MACHMODE (TImode, "TI", MODE_INT, 16, 16, VOIDmode)
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DEF_MACHMODE (SFmode, "SF", MODE_FLOAT, 4, 4, DFmode)
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DEF_MACHMODE (DFmode, "DF", MODE_FLOAT, 8, 8, XFmode)
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DEF_MACHMODE (XFmode, "XF", MODE_FLOAT, 12, 12, TFmode) /* IEEE extended */
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DEF_MACHMODE (TFmode, "TF", MODE_FLOAT, 16, 16, VOIDmode)
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DEF_MACHMODE (SCmode, "SC", MODE_COMPLEX_FLOAT, 8, 4, DCmode)
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DEF_MACHMODE (DCmode, "DC", MODE_COMPLEX_FLOAT, 16, 8, XCmode)
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DEF_MACHMODE (XCmode, "XC", MODE_COMPLEX_FLOAT, 24, 12, TCmode)
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DEF_MACHMODE (TCmode, "TC", MODE_COMPLEX_FLOAT, 32, 16, VOIDmode)
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/* BLKmode is used for structures, arrays, etc.
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that fit no more specific mode. */
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DEF_MACHMODE (BLKmode, "BLK", MODE_RANDOM, 0, 0, VOIDmode)
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/* The modes for representing the condition codes come last. CCmode is
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always defined. Additional modes for the condition code can be specified
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in the EXTRA_CC_MODES macro. Everything but the names of the modes
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are copied from CCmode. For these modes, GET_MODE_WIDER_MODE points
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to the next defined CC mode, if any. */
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DEF_MACHMODE (CCmode, "CC", MODE_CC, 4, 4, VOIDmode)
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/* The symbol Pmode stands for one of the above machine modes (usually SImode).
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The tm file specifies which one. It is not a distinct mode. */
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/*
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Local variables:
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mode:c
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version-control: t
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End:
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*/
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