gcc/config/rs6000/rs6000-modes.def

   1 /* Definitions of target machine for GNU compiler, for IBM RS/6000.
   2    Copyright (C) 2002-2023 Free Software Foundation, Inc.
   3    Contributed by Richard Kenner (kenner@vlsi1.ultra.nyu.edu)
   4
   5    This file is part of GCC.
   6
   7    GCC is free software; you can redistribute it and/or modify it
   8    under the terms of the GNU General Public License as published
   9    by the Free Software Foundation; either version 3, or (at your
  10    option) any later version.
  11
  12    GCC is distributed in the hope that it will be useful, but WITHOUT
  13    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  15    License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with GCC; see the file COPYING3.  If not see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 /* We order the 3 128-bit floating point types so that IFmode (IBM 128-bit
  22    floating point) is the 128-bit floating point type with the highest
  23    precision (128 bits).  This so that machine independent parts of the
  24    compiler do not try to widen IFmode to TFmode on ISA 3.0 (power9) that has
  25    hardware support for IEEE 128-bit.  We set TFmode (long double mode) in
  26    between, and KFmode (explicit __float128) below it.
  27
  28    Previously, IFmode and KFmode were defined to be fractional modes and TFmode
  29    was the standard mode.  Since IFmode does not define the normal arithmetic
  30    insns (other than neg/abs), on a ISA 3.0 system, the machine independent
  31    parts of the compiler would see that TFmode has the necessary hardware
  32    support, and widen the operation from IFmode to TFmode.  However, IEEE
  33    128-bit is not strictly a super-set of IBM extended double and the
  34    conversion to/from IEEE 128-bit was a function call.
  35
  36    We now make IFmode the highest fractional mode, which means its values are
  37    not considered for widening.  Since we don't define insns for IFmode, the
  38    IEEE 128-bit modes would not widen to IFmode.  */
  39
  40 #ifndef RS6000_MODES_H
  41 #include "config/rs6000/rs6000-modes.h"
  42 #endif
  43
  44 /* IBM 128-bit floating point.  */
  45 FRACTIONAL_FLOAT_MODE (IF, FLOAT_PRECISION_IFmode, 16, ibm_extended_format);
  46
  47 /* Explicit IEEE 128-bit floating point.  */
  48 FRACTIONAL_FLOAT_MODE (KF, FLOAT_PRECISION_KFmode, 16, ieee_quad_format);
  49
  50 /* 128-bit floating point, either IBM 128-bit or IEEE 128-bit.  This is
  51    adjusted in rs6000_option_override_internal to be the appropriate floating
  52    point type.  */
  53 FRACTIONAL_FLOAT_MODE (TF, FLOAT_PRECISION_TFmode, 16, ieee_quad_format);
  54
  55 /* Add any extra modes needed to represent the condition code.
  56
  57    For the RS/6000, we need separate modes when unsigned (logical) comparisons
  58    are being done and we need a separate mode for floating-point.  We also
  59    use a mode for the case when we are comparing the results of two
  60    comparisons, as then only the EQ bit is valid in the register.  */
  61
  62 CC_MODE (CCUNS);
  63 CC_MODE (CCFP);
  64 CC_MODE (CCEQ);
  65
  66 /* Vector modes.  */
  67
  68 /* VMX/VSX.  */
  69 VECTOR_MODES (INT, 16);       /* V16QI V8HI  V4SI V2DI */
  70 VECTOR_MODE (INT, TI, 1);     /*                  V1TI */
  71 VECTOR_MODES (FLOAT, 16);     /*       V8HF  V4SF V2DF */
  72
  73 /* Two VMX/VSX vectors (for permute, select, concat, etc.)  */
  74 VECTOR_MODES (INT, 32);       /* V32QI V16HI V8SI V4DI */
  75 VECTOR_MODES (FLOAT, 32);     /*       V16HF V8SF V4DF */
  76
  77 /* Half VMX/VSX vector (for internal use)  */
  78 VECTOR_MODE (FLOAT, SF, 2);   /*                 V2SF  */
  79 VECTOR_MODE (INT, SI, 2);     /*                 V2SI  */
  80
  81 /* Replacement for TImode that only is allowed in GPRs.  We also use PTImode
  82    for quad memory atomic operations to force getting an even/odd register
  83    combination.  */
  84 PARTIAL_INT_MODE (TI, 128, PTI);
  85
  86 /* Modes used by __vector_pair and __vector_quad.  */
  87 OPAQUE_MODE (OO, 32);
  88 OPAQUE_MODE (XO, 64);
  89
  90 /* Modes used by __dmr.  */
  91 OPAQUE_MODE (TDO, 128);
  92