sysdeps/sparc/sparc64/sfp-machine.h

   1 /* Machine-dependent software floating-point definitions.
   2    Sparc64 userland (_Q_* and _Qp_*) version.
   3    Copyright (C) 1997-2023 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 <fpu_control.h>
  21 #include <fenv.h>
  22 #include <stdlib.h>
  23
  24 #define _FP_W_TYPE_SIZE         64
  25 #define _FP_W_TYPE              unsigned long
  26 #define _FP_WS_TYPE             signed long
  27 #define _FP_I_TYPE              long
  28
  29 /* Helper macros for _FP_MUL_MEAT_2_120_240_double.  */
  30 #define _FP_MUL_MEAT_SET_FE_TZ                                  \
  31 do {                                                            \
  32   static fpu_control_t _fetz = _FPU_RC_DOWN;                    \
  33   _FPU_SETCW(_fetz);                                            \
  34 } while (0)
  35 #ifndef _FP_MUL_MEAT_RESET_FE
  36 #define _FP_MUL_MEAT_RESET_FE _FPU_SETCW(_fcw)
  37 #endif
  38
  39 #define _FP_MUL_MEAT_S(R,X,Y)                                   \
  40   _FP_MUL_MEAT_1_imm(_FP_WFRACBITS_S,R,X,Y)
  41 #define _FP_MUL_MEAT_D(R,X,Y)                                   \
  42   _FP_MUL_MEAT_1_wide(_FP_WFRACBITS_D,R,X,Y,umul_ppmm)
  43 #define _FP_MUL_MEAT_Q(R,X,Y)                                   \
  44   _FP_MUL_MEAT_2_120_240_double(_FP_WFRACBITS_Q,R,X,Y,          \
  45                                 _FP_MUL_MEAT_SET_FE_TZ,         \
  46                                 _FP_MUL_MEAT_RESET_FE)
  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 << 1) - 1)
  53 #define _FP_NANFRAC_D           ((_FP_QNANBIT_D << 1) - 1)
  54 #define _FP_NANFRAC_Q           ((_FP_QNANBIT_Q << 1) - 1), -1
  55 #define _FP_NANSIGN_S           0
  56 #define _FP_NANSIGN_D           0
  57 #define _FP_NANSIGN_Q           0
  58
  59 #define _FP_KEEPNANFRACP 1
  60 #define _FP_QNANNEGATEDP 0
  61
  62 /* If one NaN is signaling and the other is not,
  63  * we choose that one, otherwise we choose Y.
  64  */
  65 #define _FP_CHOOSENAN(fs, wc, R, X, Y, OP)                      \
  66   do {                                                          \
  67     if ((_FP_FRAC_HIGH_RAW_##fs(Y) & _FP_QNANBIT_##fs)          \
  68         && !(_FP_FRAC_HIGH_RAW_##fs(X) & _FP_QNANBIT_##fs))     \
  69       {                                                         \
  70         R##_s = X##_s;                                          \
  71         _FP_FRAC_COPY_##wc(R,X);                                \
  72       }                                                         \
  73     else                                                        \
  74       {                                                         \
  75         R##_s = Y##_s;                                          \
  76         _FP_FRAC_COPY_##wc(R,Y);                                \
  77       }                                                         \
  78     R##_c = FP_CLS_NAN;                                         \
  79   } while (0)
  80
  81 /* Obtain the current rounding mode. */
  82 #ifndef FP_ROUNDMODE
  83 #define FP_ROUNDMODE    ((_fcw >> 30) & 0x3)
  84 #endif
  85
  86 /* Exception flags. */
  87 #define FP_EX_INVALID           (1 << 4)
  88 #define FP_EX_OVERFLOW          (1 << 3)
  89 #define FP_EX_UNDERFLOW         (1 << 2)
  90 #define FP_EX_DIVZERO           (1 << 1)
  91 #define FP_EX_INEXACT           (1 << 0)
  92
  93 #define _FP_TININESS_AFTER_ROUNDING 0
  94
  95 #define _FP_DECL_EX \
  96   fpu_control_t _fcw __attribute__ ((unused)) = (FP_RND_NEAREST << 30)
  97
  98 #define FP_INIT_ROUNDMODE                                       \
  99 do {                                                            \
 100   _FPU_GETCW(_fcw);                                             \
 101 } while (0)
 102
 103 #define FP_TRAPPING_EXCEPTIONS ((_fcw >> 23) & 0x1f)
 104 #define FP_INHIBIT_RESULTS ((_fcw >> 23) & _fex)
 105
 106 /* Simulate exceptions using double arithmetics. */
 107 extern void __Qp_handle_exceptions(int exc);
 108
 109 #define FP_HANDLE_EXCEPTIONS                                    \
 110 do {                                                            \
 111   if (!_fex)                                                    \
 112     {                                                           \
 113       /* This is the common case, so we do it inline.           \
 114        * We need to clear cexc bits if any.                     \
 115        */                                                       \
 116       __asm__ __volatile__("fzero %%f62\n\t"                    \
 117                            "faddd %%f62, %%f62, %%f62"          \
 118                            : : : "f62");                        \
 119     }                                                           \
 120   else                                                          \
 121     {                                                           \
 122       __Qp_handle_exceptions (_fex);                            \
 123     }                                                           \
 124 } while (0)
 125
 126 #define QP_HANDLE_EXCEPTIONS(_a)                                \
 127 do {                                                            \
 128   if ((_fcw >> 23) & _fex)                                      \
 129     {                                                           \
 130       _a;                                                       \
 131     }                                                           \
 132   else                                                          \
 133     {                                                           \
 134       _fcw = (_fcw & ~0x1fL) | (_fex << 5) | _fex;              \
 135       _FPU_SETCW(_fcw);                                         \
 136     }                                                           \
 137 } while (0)
 138
 139 #define QP_NO_EXCEPTIONS                                        \
 140   __asm ("fzero %%f62\n\t"                                      \
 141          "faddd %%f62, %%f62, %%f62" : : : "f62")
 142
 143 #define QP_CLOBBER "memory", "f52", "f54", "f56", "f58", "f60", "f62"
 144 #define QP_CLOBBER_CC QP_CLOBBER , "cc"