176 lines
8.6 KiB
Modula-2
176 lines
8.6 KiB
Modula-2
/* This file contains the definitions and documentation for the
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machine modes used in the GNU compiler.
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Copyright (C) 1987, 1992, 1994, 1997, 1998, 2000 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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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 GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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/* This file defines all the MACHINE MODES used by GCC.
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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 - PQImode, PHImode, 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_VECTOR_INT, MODE_VECTOR_FLOAT - vector
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MODE_RANDOM - anything else
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Fourth argument is the relative size of the object, in bits,
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so we can have modes smaller than 1 byte.
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Fifth 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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Sixth arg is the relative size of subunits of the object.
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It is same as the fifth argument except for complexes and vectors,
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since they are really made of many equal size subunits.
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Seventh arg is next wider natural mode of the same class. 0 if
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there is none. Vector modes use this field to point to the next
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vector size, so we can iterate through the different vectors modes.
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The ordering is by increasing byte size, with QI coming before HI,
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HI before SI, etc.
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Eigth arg is the mode of the internal elements in a vector or
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complex, and VOIDmode if not applicable.
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*/
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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, 0, VOIDmode, VOIDmode)
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DEF_MACHMODE (BImode, "BI", MODE_INT, 1, 1, 1, QImode, VOIDmode)
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DEF_MACHMODE (QImode, "QI", MODE_INT, BITS_PER_UNIT, 1, 1, HImode, VOIDmode)
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DEF_MACHMODE (HImode, "HI", MODE_INT, BITS_PER_UNIT*2, 2, 2, SImode, VOIDmode)
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DEF_MACHMODE (SImode, "SI", MODE_INT, BITS_PER_UNIT*4, 4, 4, DImode, VOIDmode)
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DEF_MACHMODE (DImode, "DI", MODE_INT, BITS_PER_UNIT*8, 8, 8, TImode, VOIDmode)
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DEF_MACHMODE (TImode, "TI", MODE_INT, BITS_PER_UNIT*16, 16, 16, OImode, VOIDmode)
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DEF_MACHMODE (OImode, "OI", MODE_INT, BITS_PER_UNIT*32, 32, 32, VOIDmode, VOIDmode)
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/* Pointers on some machines use these types to distinguish them from
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ints. Useful if a pointer is 4 bytes but has some bits that are
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not significant, so it is really not quite as wide as an integer. */
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DEF_MACHMODE (PQImode, "PQI", MODE_PARTIAL_INT, BITS_PER_UNIT, 1, 1, PHImode, VOIDmode)
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DEF_MACHMODE (PHImode, "PHI", MODE_PARTIAL_INT, BITS_PER_UNIT*2, 2, 2, PSImode, VOIDmode)
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DEF_MACHMODE (PSImode, "PSI", MODE_PARTIAL_INT, BITS_PER_UNIT*4, 4, 4, PDImode, VOIDmode)
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DEF_MACHMODE (PDImode, "PDI", MODE_PARTIAL_INT, BITS_PER_UNIT*8, 8, 8, VOIDmode, VOIDmode)
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DEF_MACHMODE (QFmode, "QF", MODE_FLOAT, BITS_PER_UNIT, 1, 1, HFmode, VOIDmode)
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DEF_MACHMODE (HFmode, "HF", MODE_FLOAT, BITS_PER_UNIT*2, 2, 2, TQFmode, VOIDmode)
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DEF_MACHMODE (TQFmode, "TQF", MODE_FLOAT, BITS_PER_UNIT*3, 3, 3, SFmode, VOIDmode) /* MIL-STD-1750A */
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DEF_MACHMODE (SFmode, "SF", MODE_FLOAT, BITS_PER_UNIT*4, 4, 4, DFmode, VOIDmode)
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DEF_MACHMODE (DFmode, "DF", MODE_FLOAT, BITS_PER_UNIT*8, 8, 8, XFmode, VOIDmode)
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DEF_MACHMODE (XFmode, "XF", MODE_FLOAT, BITS_PER_UNIT*12, 12, 12, TFmode, VOIDmode) /* IEEE extended */
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DEF_MACHMODE (TFmode, "TF", MODE_FLOAT, BITS_PER_UNIT*16, 16, 16, VOIDmode, VOIDmode)
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/* Complex modes. */
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DEF_MACHMODE (QCmode, "QC", MODE_COMPLEX_FLOAT, BITS_PER_UNIT*2, 2, 1, HCmode, QFmode)
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DEF_MACHMODE (HCmode, "HC", MODE_COMPLEX_FLOAT, BITS_PER_UNIT*4, 4, 2, SCmode, HFmode)
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DEF_MACHMODE (SCmode, "SC", MODE_COMPLEX_FLOAT, BITS_PER_UNIT*8, 8, 4, DCmode, SFmode)
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DEF_MACHMODE (DCmode, "DC", MODE_COMPLEX_FLOAT, BITS_PER_UNIT*16, 16, 8, XCmode, DFmode)
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DEF_MACHMODE (XCmode, "XC", MODE_COMPLEX_FLOAT, BITS_PER_UNIT*24, 24, 12, TCmode, XFmode)
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DEF_MACHMODE (TCmode, "TC", MODE_COMPLEX_FLOAT, BITS_PER_UNIT*32, 32, 16, VOIDmode, TFmode)
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DEF_MACHMODE (CQImode, "CQI", MODE_COMPLEX_INT, BITS_PER_UNIT*2, 2, 1, CHImode, QImode)
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DEF_MACHMODE (CHImode, "CHI", MODE_COMPLEX_INT, BITS_PER_UNIT*4, 4, 2, CSImode, HImode)
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DEF_MACHMODE (CSImode, "CSI", MODE_COMPLEX_INT, BITS_PER_UNIT*8, 8, 4, CDImode, SImode)
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DEF_MACHMODE (CDImode, "CDI", MODE_COMPLEX_INT, BITS_PER_UNIT*16, 16, 8, CTImode, DImode)
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DEF_MACHMODE (CTImode, "CTI", MODE_COMPLEX_INT, BITS_PER_UNIT*32, 32, 16, COImode, TImode)
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DEF_MACHMODE (COImode, "COI", MODE_COMPLEX_INT, BITS_PER_UNIT*64, 64, 32, VOIDmode, OImode)
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/* Vector modes. */
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/* There are no V1xx vector modes. These are equivalent to normal
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scalar modes. */
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/* The wider mode field for vectors follows in order of increasing bit
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size with QI coming before HI, HI before SI, and SI before DI
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within same bit sizes. */
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DEF_MACHMODE (V2QImode, "V2QI", MODE_VECTOR_INT, BITS_PER_UNIT*2, 2, 1, V4QImode, QImode)
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DEF_MACHMODE (V2HImode, "V2HI", MODE_VECTOR_INT, BITS_PER_UNIT*4, 4, 2, V8QImode, HImode)
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DEF_MACHMODE (V2SImode, "V2SI", MODE_VECTOR_INT, BITS_PER_UNIT*8, 8, 4, V16QImode, SImode)
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DEF_MACHMODE (V2DImode, "V2DI", MODE_VECTOR_INT, BITS_PER_UNIT*16, 16, 8, V8SImode, DImode)
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DEF_MACHMODE (V4QImode, "V4QI", MODE_VECTOR_INT, BITS_PER_UNIT*4, 4, 1, V2HImode, QImode)
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DEF_MACHMODE (V4HImode, "V4HI", MODE_VECTOR_INT, BITS_PER_UNIT*8, 8, 2, V2SImode, HImode)
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DEF_MACHMODE (V4SImode, "V4SI", MODE_VECTOR_INT, BITS_PER_UNIT*16, 16, 4, V2DImode, SImode)
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DEF_MACHMODE (V4DImode, "V4DI", MODE_VECTOR_INT, BITS_PER_UNIT*32, 32, 8, V8DImode, DImode)
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DEF_MACHMODE (V8QImode, "V8QI", MODE_VECTOR_INT, BITS_PER_UNIT*8, 8, 1, V4HImode, QImode)
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DEF_MACHMODE (V8HImode, "V8HI", MODE_VECTOR_INT, BITS_PER_UNIT*16, 16, 2, V4SImode, HImode)
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DEF_MACHMODE (V8SImode, "V8SI", MODE_VECTOR_INT, BITS_PER_UNIT*32, 32, 4, V4DImode, SImode)
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DEF_MACHMODE (V8DImode, "V8DI", MODE_VECTOR_INT, BITS_PER_UNIT*64, 64, 8, VOIDmode, DImode)
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DEF_MACHMODE (V16QImode, "V16QI", MODE_VECTOR_INT, BITS_PER_UNIT*16, 16, 1, V8HImode, QImode)
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DEF_MACHMODE (V2SFmode, "V2SF", MODE_VECTOR_FLOAT, BITS_PER_UNIT*8, 8, 4, V4SFmode, SFmode)
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DEF_MACHMODE (V2DFmode, "V2DF", MODE_VECTOR_FLOAT, BITS_PER_UNIT*16, 16, 8, V8SFmode, DFmode)
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DEF_MACHMODE (V4SFmode, "V4SF", MODE_VECTOR_FLOAT, BITS_PER_UNIT*16, 16, 4, V2DFmode, SFmode)
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DEF_MACHMODE (V4DFmode, "V4DF", MODE_VECTOR_FLOAT, BITS_PER_UNIT*32, 32, 8, V8DFmode, DFmode)
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DEF_MACHMODE (V8SFmode, "V8SF", MODE_VECTOR_FLOAT, BITS_PER_UNIT*32, 32, 4,V4DFmode, SFmode)
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DEF_MACHMODE (V8DFmode, "V8DF", MODE_VECTOR_FLOAT, BITS_PER_UNIT*64, 64, 8, VOIDmode, DFmode)
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DEF_MACHMODE (V16SFmode, "V16SF", MODE_VECTOR_FLOAT, 512, 64, 4, VOIDmode, SFmode)
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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, 0, VOIDmode, VOIDmode)
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/* The modes for representing the condition codes come last. CCmode
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is always defined. Additional modes for the condition code can be
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specified in the EXTRA_CC_MODES macro. All MODE_CC modes are the
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same width as SImode and have VOIDmode as their next wider mode. */
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#define CC(E, M) DEF_MACHMODE (E, M, MODE_CC, BITS_PER_UNIT*4, 4, 4, VOIDmode, VOIDmode)
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CC (CCmode, "CC")
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#ifdef EXTRA_CC_MODES
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EXTRA_CC_MODES
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#endif
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#undef CC
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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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