sysdeps/riscv/sfp-machine.h

   1 /* RISC-V softfloat definitions
   2    Copyright (C) 2017-2018 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    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <fenv.h>
  21 #include <fpu_control.h>
  22
  23 #if __riscv_xlen == 32
  24
  25 # error "rv32i-based targets are not supported"
  26
  27 #else
  28
  29 # define _FP_W_TYPE_SIZE                64
  30 # define _FP_W_TYPE             unsigned long long
  31 # define _FP_WS_TYPE            signed long long
  32 # define _FP_I_TYPE             long long
  33
  34 # define _FP_MUL_MEAT_S(R, X, Y)                                        \
  35   _FP_MUL_MEAT_1_imm (_FP_WFRACBITS_S, R, X, Y)
  36 # define _FP_MUL_MEAT_D(R, X, Y)                                        \
  37   _FP_MUL_MEAT_1_wide (_FP_WFRACBITS_D, R, X, Y, umul_ppmm)
  38 # define _FP_MUL_MEAT_Q(R, X, Y)                                        \
  39   _FP_MUL_MEAT_2_wide_3mul (_FP_WFRACBITS_Q, R, X, Y, umul_ppmm)
  40
  41 # define _FP_MUL_MEAT_DW_S(R, X, Y)                                     \
  42   _FP_MUL_MEAT_DW_1_imm (_FP_WFRACBITS_S, R, X, Y)
  43 # define _FP_MUL_MEAT_DW_D(R, X, Y)                                     \
  44   _FP_MUL_MEAT_DW_1_wide (_FP_WFRACBITS_D, R, X, Y, umul_ppmm)
  45 # define _FP_MUL_MEAT_DW_Q(R, X, Y)                                     \
  46   _FP_MUL_MEAT_DW_2_wide_3mul (_FP_WFRACBITS_Q, R, X, Y, umul_ppmm)
  47
  48 # define _FP_DIV_MEAT_S(R, X, Y)        _FP_DIV_MEAT_1_imm (S, R, X, Y, _FP_DIV_HELP_imm)
  49 # define _FP_DIV_MEAT_D(R, X, Y)        _FP_DIV_MEAT_1_udiv_norm (D, R, X, Y)
  50 # define _FP_DIV_MEAT_Q(R, X, Y)        _FP_DIV_MEAT_2_udiv (Q, R, X, Y)
  51
  52 # define _FP_NANFRAC_S          _FP_QNANBIT_S
  53 # define _FP_NANFRAC_D          _FP_QNANBIT_D
  54 # define _FP_NANFRAC_Q          _FP_QNANBIT_Q, 0
  55
  56 #endif
  57
  58 #define _FP_NANSIGN_S           0
  59 #define _FP_NANSIGN_D           0
  60 #define _FP_NANSIGN_Q           0
  61
  62 #define _FP_KEEPNANFRACP 0
  63 #define _FP_QNANNEGATEDP 0
  64
  65 #define _FP_CHOOSENAN(fs, wc, R, X, Y, OP)      \
  66   do {                                          \
  67     R##_s = _FP_NANSIGN_##fs;                   \
  68     _FP_FRAC_SET_##wc (R, _FP_NANFRAC_##fs);    \
  69     R##_c = FP_CLS_NAN;                         \
  70   } while (0)
  71
  72 #define _FP_DECL_EX             int _frm __attribute__ ((unused));
  73 #define FP_ROUNDMODE            _frm
  74
  75 #define FP_RND_NEAREST          FE_TONEAREST
  76 #define FP_RND_ZERO             FE_TOWARDZERO
  77 #define FP_RND_PINF             FE_UPWARD
  78 #define FP_RND_MINF             FE_DOWNWARD
  79
  80 #define FP_EX_INVALID           FE_INVALID
  81 #define FP_EX_OVERFLOW          FE_OVERFLOW
  82 #define FP_EX_UNDERFLOW         FE_UNDERFLOW
  83 #define FP_EX_DIVZERO           FE_DIVBYZERO
  84 #define FP_EX_INEXACT           FE_INEXACT
  85
  86 #define _FP_TININESS_AFTER_ROUNDING 1
  87
  88 #ifdef __riscv_flen
  89 # define FP_INIT_ROUNDMODE                      \
  90 do {                                            \
  91   __asm__ volatile ("frrm %0" : "=r" (_frm));   \
  92 } while (0)
  93
  94 # define FP_HANDLE_EXCEPTIONS                                   \
  95 do {                                                            \
  96   if (__builtin_expect (_fex, 0))                               \
  97     __asm__ volatile ("csrs fflags, %0" : : "rK" (_fex));       \
  98 } while (0)
  99 #else
 100 # define FP_INIT_ROUNDMODE      _frm = FP_RND_NEAREST
 101 #endif