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authormycroft <mycroft@138bc75d-0d04-0410-961f-82ee72b054a4>1991-05-31 20:43:32 +0000
committermycroft <mycroft@138bc75d-0d04-0410-961f-82ee72b054a4>1991-05-31 20:43:32 +0000
commit34af06d14eedc1220bfb44a3a49eb71d1cd7655c (patch)
tree28228a9ca9652731b653f318f72df445e087a8b6 /gcc/machmode.def
parenta63fe6f494be77cf19b28fb76686883c3b5b4a48 (diff)
downloadgcc-34af06d14eedc1220bfb44a3a49eb71d1cd7655c.tar.gz
Initial revision
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@26 138bc75d-0d04-0410-961f-82ee72b054a4
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+/* This file contains the definitions and documentation for the
+ machine modes used in the the GNU compiler.
+ Copyright (C) 1987-1990 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, 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_PARTIAL_INT - PSImode and PDImode
+ MODE_CC - modes used for representing the condition code in a register
+ MODE_COMPLEX_INT, MODE_COMPLEX_FLOAT - complex number
+ MODE_RANDOM - anything else
+
+ Fourth argument is the relative size of the object, in bytes.
+ It is zero when the size is meaningless or not determined.
+ A byte's size is determined by BITS_PER_UNIT in tm.h.
+
+
+ Fifth arg is the relative size of subunits of the object.
+ It is same as the fourth argument except for complexes,
+ since they are really made of two equal size subunits.
+
+ Sixth arg is next wider natural mode of the same class.
+ 0 if there is none. */
+
+/* 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, VOIDmode)
+
+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_PARTIAL_INT, 4, 4, VOIDmode)
+DEF_MACHMODE (SImode, "SI", MODE_INT, 4, 4, DImode)
+DEF_MACHMODE (PDImode, "PDI", MODE_PARTIAL_INT, 8, 8, VOIDmode)
+DEF_MACHMODE (DImode, "DI", MODE_INT, 8, 8, TImode)
+DEF_MACHMODE (TImode, "TI", MODE_INT, 16, 16, VOIDmode)
+
+DEF_MACHMODE (SFmode, "SF", MODE_FLOAT, 4, 4, DFmode)
+DEF_MACHMODE (DFmode, "DF", MODE_FLOAT, 8, 8, XFmode)
+DEF_MACHMODE (XFmode, "XF", MODE_FLOAT, 12, 12, TFmode) /* IEEE extended */
+DEF_MACHMODE (TFmode, "TF", MODE_FLOAT, 16, 16, VOIDmode)
+
+DEF_MACHMODE (SCmode, "SC", MODE_COMPLEX_FLOAT, 8, 4, DCmode)
+DEF_MACHMODE (DCmode, "DC", MODE_COMPLEX_FLOAT, 16, 8, XCmode)
+DEF_MACHMODE (XCmode, "XC", MODE_COMPLEX_FLOAT, 24, 12, TCmode)
+DEF_MACHMODE (TCmode, "TC", MODE_COMPLEX_FLOAT, 32, 16, VOIDmode)
+
+/* BLKmode is used for structures, arrays, etc.
+ that fit no more specific mode. */
+DEF_MACHMODE (BLKmode, "BLK", MODE_RANDOM, 0, 0, VOIDmode)
+
+/* The modes for representing the condition codes come last. CCmode is
+ always defined. Additional modes for the condition code can be specified
+ in the EXTRA_CC_MODES macro. Everything but the names of the modes
+ are copied from CCmode. For these modes, GET_MODE_WIDER_MODE points
+ to the next defined CC mode, if any. */
+
+DEF_MACHMODE (CCmode, "CC", MODE_CC, 4, 4, VOIDmode)
+
+/* 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:
+*/