xref: /src/external/gpl3/gcc/dist/libgcc/config/riscv/sfp-machine.h

/* Software floating-point machine description for RISC-V.

   Copyright (C) 2016-2024 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.

Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
<http://www.gnu.org/licenses/>.  */

#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_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_H		_FP_QNANBIT_H
#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_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_H		_FP_QNANBIT_H
#define _FP_NANFRAC_S		_FP_QNANBIT_S
#define _FP_NANFRAC_D		_FP_QNANBIT_D
#define _FP_NANFRAC_Q		_FP_QNANBIT_Q, 0

#endif

#if __riscv_xlen == 64
typedef int TItype __attribute__ ((mode (TI)));
typedef unsigned int UTItype __attribute__ ((mode (TI)));
#define TI_BITS (__CHAR_BIT__ * (int)sizeof(TItype))
#endif

/* The type of the result of a floating point comparison.  This must
   match __libgcc_cmp_return__ in GCC for the target.  */
typedef int __gcc_CMPtype __attribute__ ((mode (__libgcc_cmp_return__)));
#define CMPtype __gcc_CMPtype

#define _FP_NANSIGN_H		0
#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		0x0
#define FP_RND_ZERO		0x1
#define FP_RND_PINF		0x3
#define FP_RND_MINF		0x2

#define FP_EX_INVALID		0x10
#define FP_EX_OVERFLOW		0x04
#define FP_EX_UNDERFLOW		0x02
#define FP_EX_DIVZERO		0x08
#define FP_EX_INEXACT		0x01

#define _FP_TININESS_AFTER_ROUNDING 1

#if defined(__riscv_flen) || defined(__riscv_zfinx)
#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

#define	__LITTLE_ENDIAN	1234
#define	__BIG_ENDIAN	4321

#if defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
#define __BYTE_ORDER __BIG_ENDIAN
#else
#define __BYTE_ORDER __LITTLE_ENDIAN
#endif


/* Define ALIASNAME as a strong alias for NAME.  */
# define strong_alias(name, aliasname) _strong_alias(name, aliasname)
# define _strong_alias(name, aliasname) \
  extern __typeof (name) aliasname __attribute__ ((alias (#name)));