glibc/sysdeps/riscv/sfp-machine.h

/* RISC-V softfloat definitions
   Copyright (C) 2017-2024 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library.  If not, see
   <https://www.gnu.org/licenses/>.  */

#include <fenv.h>
#include <fpu_control.h>

#if __riscv_xlen == 32

# define _FP_W_TYPE_SIZE	32
# define _FP_W_TYPE		unsigned long
# define _FP_WS_TYPE		signed long
# define _FP_I_TYPE		long

# define _FP_MUL_MEAT_S(R, X, Y)				\
  _FP_MUL_MEAT_1_wide (_FP_WFRACBITS_S, R, X, Y, umul_ppmm)
# define _FP_MUL_MEAT_D(R, X, Y)				\
  _FP_MUL_MEAT_2_wide (_FP_WFRACBITS_D, R, X, Y, umul_ppmm)
# define _FP_MUL_MEAT_Q(R, X, Y)				\
  _FP_MUL_MEAT_4_wide (_FP_WFRACBITS_Q, R, X, Y, umul_ppmm)

# define _FP_MUL_MEAT_DW_S(R, X, Y)					\
  _FP_MUL_MEAT_DW_1_wide (_FP_WFRACBITS_S, R, X, Y, umul_ppmm)
# define _FP_MUL_MEAT_DW_D(R, X, Y)					\
  _FP_MUL_MEAT_DW_2_wide (_FP_WFRACBITS_D, R, X, Y, umul_ppmm)
# define _FP_MUL_MEAT_DW_Q(R, X, Y)					\
  _FP_MUL_MEAT_DW_4_wide (_FP_WFRACBITS_Q, R, X, Y, umul_ppmm)

# define _FP_DIV_MEAT_S(R, X, Y)	_FP_DIV_MEAT_1_udiv_norm (S, R, X, Y)
# define _FP_DIV_MEAT_D(R, X, Y)	_FP_DIV_MEAT_2_udiv (D, R, X, Y)
# define _FP_DIV_MEAT_Q(R, X, Y)	_FP_DIV_MEAT_4_udiv (Q, R, X, Y)

# define _FP_NANFRAC_S		_FP_QNANBIT_S
# define _FP_NANFRAC_D		_FP_QNANBIT_D, 0
# define _FP_NANFRAC_Q		_FP_QNANBIT_Q, 0, 0, 0

#else

# define _FP_W_TYPE_SIZE		64
# define _FP_W_TYPE		unsigned long long
# define _FP_WS_TYPE		signed long long
# define _FP_I_TYPE		long long

# define _FP_MUL_MEAT_S(R, X, Y)					\
  _FP_MUL_MEAT_1_imm (_FP_WFRACBITS_S, R, X, Y)
# define _FP_MUL_MEAT_D(R, X, Y)					\
  _FP_MUL_MEAT_1_wide (_FP_WFRACBITS_D, R, X, Y, umul_ppmm)
# define _FP_MUL_MEAT_Q(R, X, Y)					\
  _FP_MUL_MEAT_2_wide_3mul (_FP_WFRACBITS_Q, R, X, Y, umul_ppmm)

# define _FP_MUL_MEAT_DW_S(R, X, Y)					\
  _FP_MUL_MEAT_DW_1_imm (_FP_WFRACBITS_S, R, X, Y)
# define _FP_MUL_MEAT_DW_D(R, X, Y)					\
  _FP_MUL_MEAT_DW_1_wide (_FP_WFRACBITS_D, R, X, Y, umul_ppmm)
# define _FP_MUL_MEAT_DW_Q(R, X, Y)					\
  _FP_MUL_MEAT_DW_2_wide_3mul (_FP_WFRACBITS_Q, R, X, Y, umul_ppmm)

# define _FP_DIV_MEAT_S(R, X, Y)	_FP_DIV_MEAT_1_imm (S, R, X, Y, _FP_DIV_HELP_imm)
# define _FP_DIV_MEAT_D(R, X, Y)	_FP_DIV_MEAT_1_udiv_norm (D, R, X, Y)
# define _FP_DIV_MEAT_Q(R, X, Y)	_FP_DIV_MEAT_2_udiv (Q, R, X, Y)

# define _FP_NANFRAC_S		_FP_QNANBIT_S
# define _FP_NANFRAC_D		_FP_QNANBIT_D
# define _FP_NANFRAC_Q		_FP_QNANBIT_Q, 0

#endif

#define _FP_NANSIGN_S		0
#define _FP_NANSIGN_D		0
#define _FP_NANSIGN_Q		0

#define _FP_KEEPNANFRACP 0
#define _FP_QNANNEGATEDP 0

#define _FP_CHOOSENAN(fs, wc, R, X, Y, OP)	\
  do {						\
    R##_s = _FP_NANSIGN_##fs;			\
    _FP_FRAC_SET_##wc (R, _FP_NANFRAC_##fs);	\
    R##_c = FP_CLS_NAN;				\
  } while (0)

#define _FP_DECL_EX		int _frm __attribute__ ((unused));
#define FP_ROUNDMODE		_frm

#define FP_RND_NEAREST		FE_TONEAREST
#define FP_RND_ZERO		FE_TOWARDZERO
#define FP_RND_PINF		FE_UPWARD
#define FP_RND_MINF		FE_DOWNWARD

#define FP_EX_INVALID		FE_INVALID
#define FP_EX_OVERFLOW		FE_OVERFLOW
#define FP_EX_UNDERFLOW		FE_UNDERFLOW
#define FP_EX_DIVZERO		FE_DIVBYZERO
#define FP_EX_INEXACT		FE_INEXACT

#define _FP_TININESS_AFTER_ROUNDING 1

#ifdef __riscv_flen
# define FP_INIT_ROUNDMODE			\
do {						\
  __asm__ volatile ("frrm %0" : "=r" (_frm));	\
} while (0)

# define FP_HANDLE_EXCEPTIONS					\
do {								\
  if (__builtin_expect (_fex, 0))				\
    __asm__ volatile ("csrs fflags, %0" : : "rK" (_fex));	\
} while (0)
#else
# define FP_INIT_ROUNDMODE	_frm = FP_RND_NEAREST
#endif