1  /* Machine-dependent software floating-point definitions.
       2     Alpha userland IEEE 128-bit version.
       3     Copyright (C) 2004-2023 Free Software Foundation, Inc.
       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_libc.h>
      21  
      22  #define _FP_W_TYPE_SIZE		64
      23  #define _FP_W_TYPE		unsigned long
      24  #define _FP_WS_TYPE		signed long
      25  #define _FP_I_TYPE		long
      26  
      27  #define _FP_MUL_MEAT_S(R,X,Y)					\
      28    _FP_MUL_MEAT_1_imm(_FP_WFRACBITS_S,R,X,Y)
      29  #define _FP_MUL_MEAT_D(R,X,Y)					\
      30    _FP_MUL_MEAT_1_wide(_FP_WFRACBITS_D,R,X,Y,umul_ppmm)
      31  #define _FP_MUL_MEAT_Q(R,X,Y)					\
      32    _FP_MUL_MEAT_2_wide(_FP_WFRACBITS_Q,R,X,Y,umul_ppmm)
      33  
      34  #define _FP_DIV_MEAT_S(R,X,Y)	_FP_DIV_MEAT_1_imm(S,R,X,Y,_FP_DIV_HELP_imm)
      35  #define _FP_DIV_MEAT_D(R,X,Y)	_FP_DIV_MEAT_1_udiv_norm(D,R,X,Y)
      36  #define _FP_DIV_MEAT_Q(R,X,Y)	_FP_DIV_MEAT_2_udiv(Q,R,X,Y)
      37  
      38  #define _FP_NANFRAC_S		((_FP_QNANBIT_S << 1) - 1)
      39  #define _FP_NANFRAC_D		((_FP_QNANBIT_D << 1) - 1)
      40  #define _FP_NANFRAC_Q		((_FP_QNANBIT_Q << 1) - 1), -1
      41  #define _FP_NANSIGN_S		0
      42  #define _FP_NANSIGN_D		0
      43  #define _FP_NANSIGN_Q		0
      44  
      45  #define _FP_KEEPNANFRACP 1
      46  #define _FP_QNANNEGATEDP 0
      47  
      48  /* Alpha Architecture Handbook, 4.7.10.4 sez that we should prefer any
      49     type of NaN in Fb, then Fa.  */
      50  #define _FP_CHOOSENAN(fs, wc, R, X, Y, OP)                      \
      51    do {                                                          \
      52      R##_s = Y##_s;                                              \
      53      _FP_FRAC_COPY_##wc(R,X);                                    \
      54      R##_c = FP_CLS_NAN;                                         \
      55    } while (0)
      56  
      57  /* Rounding mode settings.  */
      58  #define FP_RND_NEAREST		FE_TONEAREST
      59  #define FP_RND_ZERO		FE_TOWARDZERO
      60  #define FP_RND_PINF		FE_UPWARD
      61  #define FP_RND_MINF		FE_DOWNWARD
      62  
      63  /* Obtain the current rounding mode.  It's given as an argument to
      64     all the Ots functions, with 4 meaning "dynamic".  */
      65  #define FP_ROUNDMODE		_round
      66  
      67  /* Exception flags. */
      68  #define FP_EX_INVALID		FE_INVALID
      69  #define FP_EX_OVERFLOW		FE_OVERFLOW
      70  #define FP_EX_UNDERFLOW		FE_UNDERFLOW
      71  #define FP_EX_DIVZERO		FE_DIVBYZERO
      72  #define FP_EX_INEXACT		FE_INEXACT
      73  
      74  #define _FP_TININESS_AFTER_ROUNDING 1
      75  
      76  #define FP_INIT_ROUNDMODE					\
      77  do {								\
      78    if (__builtin_expect (_round == 4, 0))			\
      79      {								\
      80        unsigned long t;						\
      81        __asm__ __volatile__("excb; mf_fpcr %0" : "=f"(t));	\
      82        _round = (t >> FPCR_ROUND_SHIFT) & 3;			\
      83      }								\
      84  } while (0)
      85  
      86  /* We copy the libm function into libc for soft-fp.  */
      87  extern int __feraiseexcept (int __excepts) attribute_hidden;
      88  
      89  #define FP_HANDLE_EXCEPTIONS					\
      90  do {								\
      91    if (__builtin_expect (_fex, 0))				\
      92      __feraiseexcept (_fex);					\
      93  } while (0)
      94  
      95  #define FP_TRAPPING_EXCEPTIONS					\
      96    ((__ieee_get_fp_control () & SWCR_ENABLE_MASK) << SWCR_ENABLE_SHIFT)