gcc/config/i386/i386-modes.def

/* Definitions of target machine for GCC for IA-32.
   Copyright (C) 2002-2021 Free Software Foundation, Inc.

This file is part of GCC.

GCC 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 3, or (at your option)
any later version.

GCC 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 GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */

/* The x86_64 ABI specifies both XF and TF modes.
   XFmode is __float80 is IEEE extended; TFmode is __float128
   is IEEE quad.  */

FRACTIONAL_FLOAT_MODE (XF, 80, 12, ieee_extended_intel_96_format);
FLOAT_MODE (TF, 16, ieee_quad_format);
FLOAT_MODE (HF, 2, ieee_half_format);

/* In ILP32 mode, XFmode has size 12 and alignment 4.
   In LP64 mode, XFmode has size and alignment 16.  */
ADJUST_FLOAT_FORMAT (XF, (TARGET_128BIT_LONG_DOUBLE
			  ? &ieee_extended_intel_128_format
			  : TARGET_96_ROUND_53_LONG_DOUBLE
			  ? &ieee_extended_intel_96_round_53_format
			  : &ieee_extended_intel_96_format));
ADJUST_BYTESIZE  (XF, TARGET_128BIT_LONG_DOUBLE ? 16 : 12);
ADJUST_ALIGNMENT (XF, TARGET_128BIT_LONG_DOUBLE ? 16 : 4);

/* Add any extra modes needed to represent the condition code.

   For the i386, we need separate modes when floating-point
   equality comparisons are being done.

   Add CCNO to indicate comparisons against zero that require
   Overflow flag to be unset.  Sign bit test is used instead and
   thus can be used to form "a&b>0" type of tests.

   Add CCGC to indicate comparisons against zero that allow
   unspecified garbage in the Carry flag.  This mode is used
   by inc/dec instructions.

   Add CCGOC to indicate comparisons against zero that allow
   unspecified garbage in the Carry and Overflow flag. This
   mode is used to simulate comparisons of (a-b) and (a+b)
   against zero using sub/cmp/add operations.

   Add CCGZ to indicate comparisons that allow unspecified garbage
   in the Zero flag.  This mode is used in double-word comparisons.

   Add CCA to indicate that only the Above flag is valid.
   Add CCC to indicate that only the Carry flag is valid.
   Add CCO to indicate that only the Overflow flag is valid.
   Add CCP to indicate that only the Parity flag is valid.
   Add CCS to indicate that only the Sign flag is valid.
   Add CCZ to indicate that only the Zero flag is valid.  */

CC_MODE (CCGC);
CC_MODE (CCGOC);
CC_MODE (CCNO);
CC_MODE (CCGZ);
CC_MODE (CCA);
CC_MODE (CCC);
CC_MODE (CCO);
CC_MODE (CCP);
CC_MODE (CCS);
CC_MODE (CCZ);

CC_MODE (CCFP);

/* Vector modes.  Note that VEC_CONCAT patterns require vector
   sizes twice as big as implemented in hardware.  */
VECTOR_MODES (INT, 4);        /*              V4QI V2HI */
VECTOR_MODES (INT, 8);        /*         V8QI V4HI V2SI */
VECTOR_MODES (INT, 16);       /*   V16QI V8HI V4SI V2DI */
VECTOR_MODES (INT, 32);       /*  V32QI V16HI V8SI V4DI */
VECTOR_MODES (INT, 64);       /* V64QI V32HI V16SI V8DI */
VECTOR_MODES (INT, 128);      /* V128QI V64HI V32SI V16DI */
VECTOR_MODES (FLOAT, 8);      /*              V4HF V2SF */
VECTOR_MODES (FLOAT, 16);     /*         V8HF V4SF V2DF */
VECTOR_MODES (FLOAT, 32);     /*   V16HF V8SF V4DF V2TF */
VECTOR_MODES (FLOAT, 64);     /*  V32HF V16SF V8DF V4TF */
VECTOR_MODES (FLOAT, 128);    /* V64HF V32SF V16DF V8TF */
VECTOR_MODES (FLOAT, 256);    /* V128HF V64SF V32DF V16TF */
VECTOR_MODE (INT, TI, 1);     /*                   V1TI */
VECTOR_MODE (INT, DI, 1);     /*                   V1DI */
VECTOR_MODE (INT, SI, 1);     /*                   V1SI */
VECTOR_MODE (INT, QI, 2);     /*                   V2QI */
VECTOR_MODE (INT, QI, 12);    /*                  V12QI */
VECTOR_MODE (INT, QI, 14);    /*                  V14QI */
VECTOR_MODE (INT, HI, 6);     /*                   V6HI */
VECTOR_MODE (INT, SI, 64);    /* 		  V64SI */

INT_MODE (OI, 32);
INT_MODE (XI, 64);

/* Modes needs a consecutive register pair.
   Note that Using PARTIAL_INT_MODE but not INT_MODE is to avoid mode promotion
   issues.  */
PARTIAL_INT_MODE (HI, 16, P2QI);
PARTIAL_INT_MODE (SI, 32, P2HI);

/* Mode used for signed overflow checking of TImode.  For the overflow
   checking we actually need just 1 or 2 bits beyond TImode precision.
   Use 160 bits to have a multiple of 32.  */
PARTIAL_INT_MODE (OI, 160, POI);

/* The symbol Pmode stands for one of the above machine modes (usually SImode).
   The tm.h file specifies which one.  It is not a distinct mode.  */