sysdeps/riscv/sfp-machine.h

   1 /* RISC-V softfloat definitions
   2    Copyright (C) 2017-2023 Free Software Foundation, Inc.
   3
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library.  If not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #include <fenv.h>
  21 #include <fpu_control.h>
  22
  23 #if __riscv_xlen == 32
  24
  25 # define _FP_W_TYPE_SIZE        32
  26 # define _FP_W_TYPE             unsigned long
  27 # define _FP_WS_TYPE            signed long
  28 # define _FP_I_TYPE             long
  29
  30 # define _FP_MUL_MEAT_S(R, X, Y)                                \
  31   _FP_MUL_MEAT_1_wide (_FP_WFRACBITS_S, R, X, Y, umul_ppmm)
  32 # define _FP_MUL_MEAT_D(R, X, Y)                                \
  33   _FP_MUL_MEAT_2_wide (_FP_WFRACBITS_D, R, X, Y, umul_ppmm)
  34 # define _FP_MUL_MEAT_Q(R, X, Y)                                \
  35   _FP_MUL_MEAT_4_wide (_FP_WFRACBITS_Q, R, X, Y, umul_ppmm)
  36
  37 # define _FP_MUL_MEAT_DW_S(R, X, Y)                                     \
  38   _FP_MUL_MEAT_DW_1_wide (_FP_WFRACBITS_S, R, X, Y, umul_ppmm)
  39 # define _FP_MUL_MEAT_DW_D(R, X, Y)                                     \
  40   _FP_MUL_MEAT_DW_2_wide (_FP_WFRACBITS_D, R, X, Y, umul_ppmm)
  41 # define _FP_MUL_MEAT_DW_Q(R, X, Y)                                     \
  42   _FP_MUL_MEAT_DW_4_wide (_FP_WFRACBITS_Q, R, X, Y, umul_ppmm)
  43
  44 # define _FP_DIV_MEAT_S(R, X, Y)        _FP_DIV_MEAT_1_udiv_norm (S, R, X, Y)
  45 # define _FP_DIV_MEAT_D(R, X, Y)        _FP_DIV_MEAT_2_udiv (D, R, X, Y)
  46 # define _FP_DIV_MEAT_Q(R, X, Y)        _FP_DIV_MEAT_4_udiv (Q, R, X, Y)
  47
  48 # define _FP_NANFRAC_S          _FP_QNANBIT_S
  49 # define _FP_NANFRAC_D          _FP_QNANBIT_D, 0
  50 # define _FP_NANFRAC_Q          _FP_QNANBIT_Q, 0, 0, 0
  51
  52 #else
  53
  54 # define _FP_W_TYPE_SIZE                64
  55 # define _FP_W_TYPE             unsigned long long
  56 # define _FP_WS_TYPE            signed long long
  57 # define _FP_I_TYPE             long long
  58
  59 # define _FP_MUL_MEAT_S(R, X, Y)                                        \
  60   _FP_MUL_MEAT_1_imm (_FP_WFRACBITS_S, R, X, Y)
  61 # define _FP_MUL_MEAT_D(R, X, Y)                                        \
  62   _FP_MUL_MEAT_1_wide (_FP_WFRACBITS_D, R, X, Y, umul_ppmm)
  63 # define _FP_MUL_MEAT_Q(R, X, Y)                                        \
  64   _FP_MUL_MEAT_2_wide_3mul (_FP_WFRACBITS_Q, R, X, Y, umul_ppmm)
  65
  66 # define _FP_MUL_MEAT_DW_S(R, X, Y)                                     \
  67   _FP_MUL_MEAT_DW_1_imm (_FP_WFRACBITS_S, R, X, Y)
  68 # define _FP_MUL_MEAT_DW_D(R, X, Y)                                     \
  69   _FP_MUL_MEAT_DW_1_wide (_FP_WFRACBITS_D, R, X, Y, umul_ppmm)
  70 # define _FP_MUL_MEAT_DW_Q(R, X, Y)                                     \
  71   _FP_MUL_MEAT_DW_2_wide_3mul (_FP_WFRACBITS_Q, R, X, Y, umul_ppmm)
  72
  73 # define _FP_DIV_MEAT_S(R, X, Y)        _FP_DIV_MEAT_1_imm (S, R, X, Y, _FP_DIV_HELP_imm)
  74 # define _FP_DIV_MEAT_D(R, X, Y)        _FP_DIV_MEAT_1_udiv_norm (D, R, X, Y)
  75 # define _FP_DIV_MEAT_Q(R, X, Y)        _FP_DIV_MEAT_2_udiv (Q, R, X, Y)
  76
  77 # define _FP_NANFRAC_S          _FP_QNANBIT_S
  78 # define _FP_NANFRAC_D          _FP_QNANBIT_D
  79 # define _FP_NANFRAC_Q          _FP_QNANBIT_Q, 0
  80
  81 #endif
  82
  83 #define _FP_NANSIGN_S           0
  84 #define _FP_NANSIGN_D           0
  85 #define _FP_NANSIGN_Q           0
  86
  87 #define _FP_KEEPNANFRACP 0
  88 #define _FP_QNANNEGATEDP 0
  89
  90 #define _FP_CHOOSENAN(fs, wc, R, X, Y, OP)      \
  91   do {                                          \
  92     R##_s = _FP_NANSIGN_##fs;                   \
  93     _FP_FRAC_SET_##wc (R, _FP_NANFRAC_##fs);    \
  94     R##_c = FP_CLS_NAN;                         \
  95   } while (0)
  96
  97 #define _FP_DECL_EX             int _frm __attribute__ ((unused));
  98 #define FP_ROUNDMODE            _frm
  99
 100 #define FP_RND_NEAREST          FE_TONEAREST
 101 #define FP_RND_ZERO             FE_TOWARDZERO
 102 #define FP_RND_PINF             FE_UPWARD
 103 #define FP_RND_MINF             FE_DOWNWARD
 104
 105 #define FP_EX_INVALID           FE_INVALID
 106 #define FP_EX_OVERFLOW          FE_OVERFLOW
 107 #define FP_EX_UNDERFLOW         FE_UNDERFLOW
 108 #define FP_EX_DIVZERO           FE_DIVBYZERO
 109 #define FP_EX_INEXACT           FE_INEXACT
 110
 111 #define _FP_TININESS_AFTER_ROUNDING 1
 112
 113 #ifdef __riscv_flen
 114 # define FP_INIT_ROUNDMODE                      \
 115 do {                                            \
 116   __asm__ volatile ("frrm %0" : "=r" (_frm));   \
 117 } while (0)
 118
 119 # define FP_HANDLE_EXCEPTIONS                                   \
 120 do {                                                            \
 121   if (__builtin_expect (_fex, 0))                               \
 122     __asm__ volatile ("csrs fflags, %0" : : "rK" (_fex));       \
 123 } while (0)
 124 #else
 125 # define FP_INIT_ROUNDMODE      _frm = FP_RND_NEAREST
 126 #endif