sysdeps/mips/math_private.h

   1 /* Internal math stuff.  MIPS version.
   2    Copyright (C) 2013-2015 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _MATH_PRIVATE_H
  20
  21 #ifdef __mips_nan2008
  22 /* MIPS aligned to IEEE 754-2008.  */
  23 #else
  24 /* One of the few architectures where the meaning of the quiet/signaling bit is
  25    inverse to IEEE 754-2008 (as well as common practice for IEEE 754-1985).  */
  26 # define HIGH_ORDER_BIT_IS_SET_FOR_SNAN
  27 #endif
  28
  29 /* Inline functions to speed up the math library implementation.  The
  30    default versions of these routines are in generic/math_private.h
  31    and call fesetround, feholdexcept, etc.  These routines use inlined
  32    code instead.  */
  33
  34 #ifdef __mips_hard_float
  35
  36 # include <fenv.h>
  37 # include <fenv_libc.h>
  38 # include <fpu_control.h>
  39
  40 # define _FPU_MASK_ALL (_FPU_MASK_V | _FPU_MASK_Z | _FPU_MASK_O \
  41                         |_FPU_MASK_U | _FPU_MASK_I | FE_ALL_EXCEPT)
  42
  43 static __always_inline void
  44 libc_feholdexcept_mips (fenv_t *envp)
  45 {
  46   fpu_control_t cw;
  47
  48   /* Save the current state.  */
  49   _FPU_GETCW (cw);
  50   envp->__fp_control_register = cw;
  51
  52   /* Clear all exception enable bits and flags.  */
  53   cw &= ~(_FPU_MASK_ALL);
  54   _FPU_SETCW (cw);
  55 }
  56 # define libc_feholdexcept libc_feholdexcept_mips
  57 # define libc_feholdexceptf libc_feholdexcept_mips
  58 # define libc_feholdexceptl libc_feholdexcept_mips
  59
  60 static __always_inline void
  61 libc_fesetround_mips (int round)
  62 {
  63   fpu_control_t cw;
  64
  65   /* Get current state.  */
  66   _FPU_GETCW (cw);
  67
  68   /* Set rounding bits.  */
  69   cw &= ~_FPU_RC_MASK;
  70   cw |= round;
  71
  72   /* Set new state.  */
  73   _FPU_SETCW (cw);
  74 }
  75 # define libc_fesetround libc_fesetround_mips
  76 # define libc_fesetroundf libc_fesetround_mips
  77 # define libc_fesetroundl libc_fesetround_mips
  78
  79 static __always_inline void
  80 libc_feholdexcept_setround_mips (fenv_t *envp, int round)
  81 {
  82   fpu_control_t cw;
  83
  84   /* Save the current state.  */
  85   _FPU_GETCW (cw);
  86   envp->__fp_control_register = cw;
  87
  88   /* Clear all exception enable bits and flags.  */
  89   cw &= ~(_FPU_MASK_ALL);
  90
  91   /* Set rounding bits.  */
  92   cw &= ~_FPU_RC_MASK;
  93   cw |= round;
  94
  95   /* Set new state.  */
  96   _FPU_SETCW (cw);
  97 }
  98 # define libc_feholdexcept_setround libc_feholdexcept_setround_mips
  99 # define libc_feholdexcept_setroundf libc_feholdexcept_setround_mips
 100 # define libc_feholdexcept_setroundl libc_feholdexcept_setround_mips
 101
 102 # define libc_feholdsetround libc_feholdexcept_setround_mips
 103 # define libc_feholdsetroundf libc_feholdexcept_setround_mips
 104 # define libc_feholdsetroundl libc_feholdexcept_setround_mips
 105
 106 static __always_inline void
 107 libc_fesetenv_mips (fenv_t *envp)
 108 {
 109   fpu_control_t cw;
 110
 111   /* Read current state to flush fpu pipeline.  */
 112   _FPU_GETCW (cw);
 113
 114   _FPU_SETCW (envp->__fp_control_register);
 115 }
 116 # define libc_fesetenv libc_fesetenv_mips
 117 # define libc_fesetenvf libc_fesetenv_mips
 118 # define libc_fesetenvl libc_fesetenv_mips
 119
 120 static __always_inline int
 121 libc_feupdateenv_test_mips (fenv_t *envp, int excepts)
 122 {
 123   /* int ret = fetestexcept (excepts); feupdateenv (envp); return ret; */
 124   int cw, temp;
 125
 126   /* Get current control word.  */
 127   _FPU_GETCW (cw);
 128
 129   /* Set flag bits (which are accumulative), and *also* set the
 130      cause bits.  The setting of the cause bits is what actually causes
 131      the hardware to generate the exception, if the corresponding enable
 132      bit is set as well.  */
 133   temp = cw & FE_ALL_EXCEPT;
 134   temp |= envp->__fp_control_register | (temp << CAUSE_SHIFT);
 135
 136   /* Set new state.  */
 137   _FPU_SETCW (temp);
 138
 139   return cw & excepts & FE_ALL_EXCEPT;
 140 }
 141 # define libc_feupdateenv_test libc_feupdateenv_test_mips
 142 # define libc_feupdateenv_testf libc_feupdateenv_test_mips
 143 # define libc_feupdateenv_testl libc_feupdateenv_test_mips
 144
 145 static __always_inline void
 146 libc_feupdateenv_mips (fenv_t *envp)
 147 {
 148   libc_feupdateenv_test_mips (envp, 0);
 149 }
 150 # define libc_feupdateenv libc_feupdateenv_mips
 151 # define libc_feupdateenvf libc_feupdateenv_mips
 152 # define libc_feupdateenvl libc_feupdateenv_mips
 153
 154 # define libc_feresetround libc_feupdateenv_mips
 155 # define libc_feresetroundf libc_feupdateenv_mips
 156 # define libc_feresetroundl libc_feupdateenv_mips
 157
 158 static __always_inline int
 159 libc_fetestexcept_mips (int excepts)
 160 {
 161   int cw;
 162
 163   /* Get current control word.  */
 164   _FPU_GETCW (cw);
 165
 166   return cw & excepts & FE_ALL_EXCEPT;
 167 }
 168 # define libc_fetestexcept libc_fetestexcept_mips
 169 # define libc_fetestexceptf libc_fetestexcept_mips
 170 # define libc_fetestexceptl libc_fetestexcept_mips
 171
 172 /*  Enable support for rounding mode context.  */
 173 # define HAVE_RM_CTX 1
 174
 175 static __always_inline void
 176 libc_feholdexcept_setround_mips_ctx (struct rm_ctx *ctx, int round)
 177 {
 178   fpu_control_t old, new;
 179
 180   /* Save the current state.  */
 181   _FPU_GETCW (old);
 182   ctx->env.__fp_control_register = old;
 183
 184   /* Clear all exception enable bits and flags.  */
 185   new = old & ~(_FPU_MASK_ALL);
 186
 187   /* Set rounding bits.  */
 188   new = (new & ~_FPU_RC_MASK) | round;
 189
 190   if (__glibc_unlikely (new != old))
 191     {
 192       _FPU_SETCW (new);
 193       ctx->updated_status = true;
 194     }
 195   else
 196     ctx->updated_status = false;
 197 }
 198 # define libc_feholdexcept_setround_ctx   libc_feholdexcept_setround_mips_ctx
 199 # define libc_feholdexcept_setroundf_ctx  libc_feholdexcept_setround_mips_ctx
 200 # define libc_feholdexcept_setroundl_ctx  libc_feholdexcept_setround_mips_ctx
 201
 202 static __always_inline void
 203 libc_fesetenv_mips_ctx (struct rm_ctx *ctx)
 204 {
 205   libc_fesetenv_mips (&ctx->env);
 206 }
 207 # define libc_fesetenv_ctx                libc_fesetenv_mips_ctx
 208 # define libc_fesetenvf_ctx               libc_fesetenv_mips_ctx
 209 # define libc_fesetenvl_ctx               libc_fesetenv_mips_ctx
 210
 211 static __always_inline void
 212 libc_feupdateenv_mips_ctx (struct rm_ctx *ctx)
 213 {
 214   if (__glibc_unlikely (ctx->updated_status))
 215     libc_feupdateenv_test_mips (&ctx->env, 0);
 216 }
 217 # define libc_feupdateenv_ctx             libc_feupdateenv_mips_ctx
 218 # define libc_feupdateenvf_ctx            libc_feupdateenv_mips_ctx
 219 # define libc_feupdateenvl_ctx            libc_feupdateenv_mips_ctx
 220 # define libc_feresetround_ctx            libc_feupdateenv_mips_ctx
 221 # define libc_feresetroundf_ctx           libc_feupdateenv_mips_ctx
 222 # define libc_feresetroundl_ctx           libc_feupdateenv_mips_ctx
 223
 224 static __always_inline void
 225 libc_feholdsetround_mips_ctx (struct rm_ctx *ctx, int round)
 226 {
 227   fpu_control_t old, new;
 228
 229   /* Save the current state.  */
 230   _FPU_GETCW (old);
 231   ctx->env.__fp_control_register = old;
 232
 233   /* Set rounding bits.  */
 234   new = (old & ~_FPU_RC_MASK) | round;
 235
 236   if (__glibc_unlikely (new != old))
 237     {
 238       _FPU_SETCW (new);
 239       ctx->updated_status = true;
 240     }
 241   else
 242     ctx->updated_status = false;
 243 }
 244 # define libc_feholdsetround_ctx          libc_feholdsetround_mips_ctx
 245 # define libc_feholdsetroundf_ctx         libc_feholdsetround_mips_ctx
 246 # define libc_feholdsetroundl_ctx         libc_feholdsetround_mips_ctx
 247
 248 #endif
 249
 250 #include_next <math_private.h>
 251
 252 #endif