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

/* softfp machine description for LoongArch.
   Copyright (C) 2021-2022 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/>.  */

#ifdef __loongarch64
#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

typedef int TItype __attribute__ ((mode (TI)));
typedef unsigned int UTItype __attribute__ ((mode (TI)));
#define TI_BITS (__CHAR_BIT__ * (int) sizeof (TItype))

#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_1_wide (_FP_WFRACBITS_D, R, X, Y, umul_ppmm)
#define _FP_MUL_MEAT_Q(R, X, Y) \
  _FP_MUL_MEAT_2_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_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 << 1) - 1)
#define _FP_NANFRAC_D ((_FP_QNANBIT_D << 1) - 1)
#define _FP_NANFRAC_Q ((_FP_QNANBIT_Q << 1) - 1), -1
#else
#define _FP_W_TYPE_SIZE 32
#define _FP_W_TYPE unsigned int
#define _FP_WS_TYPE signed int
#define _FP_I_TYPE int

#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_S ((_FP_QNANBIT_S << 1) - 1)
#define _FP_NANFRAC_D ((_FP_QNANBIT_D << 1) - 1), -1
#define _FP_NANFRAC_Q ((_FP_QNANBIT_Q << 1) - 1), -1, -1, -1
#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_S 0
#define _FP_NANSIGN_D 0
#define _FP_NANSIGN_Q 0

#define _FP_KEEPNANFRACP 1
#define _FP_QNANNEGATEDP 0

/* NaN payloads should be preserved for NAN2008.  */
#define _FP_CHOOSENAN(fs, wc, R, X, Y, OP) \
  do \
    { \
      R##_s = X##_s; \
      _FP_FRAC_COPY_##wc (R, X); \
      R##_c = FP_CLS_NAN; \
    } \
  while (0)

#ifdef __loongarch_hard_float
#define FP_EX_INVALID 0x100000
#define FP_EX_DIVZERO 0x080000
#define FP_EX_OVERFLOW 0x040000
#define FP_EX_UNDERFLOW 0x020000
#define FP_EX_INEXACT 0x010000
#define FP_EX_ALL \
  (FP_EX_INVALID | FP_EX_DIVZERO | FP_EX_OVERFLOW | FP_EX_UNDERFLOW \
   | FP_EX_INEXACT)

#define FP_EX_ENABLE_SHIFT 16
#define FP_EX_CAUSE_SHIFT 8

#define FP_RND_NEAREST 0x000
#define FP_RND_ZERO 0x100
#define FP_RND_PINF 0x200
#define FP_RND_MINF 0x300
#define FP_RND_MASK 0x300

#define _FP_DECL_EX \
  unsigned long int _fcsr __attribute__ ((unused)) = FP_RND_NEAREST

#define FP_INIT_ROUNDMODE \
  do \
    { \
      _fcsr = __builtin_loongarch_movfcsr2gr (0); \
    } \
  while (0)

#define FP_ROUNDMODE (_fcsr & FP_RND_MASK)

#define FP_TRAPPING_EXCEPTIONS ((_fcsr << FP_EX_ENABLE_SHIFT) & FP_EX_ALL)

#define FP_HANDLE_EXCEPTIONS \
  do \
    { \
      _fcsr &= ~(FP_EX_ALL << FP_EX_CAUSE_SHIFT); \
      _fcsr |= _fex | (_fex << FP_EX_CAUSE_SHIFT); \
      __builtin_loongarch_movgr2fcsr (0, _fcsr); \
    } \
  while (0)

#else
#define FP_EX_INVALID (1 << 4)
#define FP_EX_DIVZERO (1 << 3)
#define FP_EX_OVERFLOW (1 << 2)
#define FP_EX_UNDERFLOW (1 << 1)
#define FP_EX_INEXACT (1 << 0)
#endif

#define _FP_TININESS_AFTER_ROUNDING 1

#define __LITTLE_ENDIAN 1234

#define __BYTE_ORDER __LITTLE_ENDIAN

/* 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)));