sysdeps/powerpc/fpu/fenv_private.h

   1 /* Private floating point rounding and exceptions handling. PowerPC version.
   2    Copyright (C) 2013-2019 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    <https://www.gnu.org/licenses/>.  */
  18
  19 #ifndef POWERPC_FENV_PRIVATE_H
  20 #define POWERPC_FENV_PRIVATE_H 1
  21
  22 #include <fenv.h>
  23 #include <fenv_libc.h>
  24 #include <fpu_control.h>
  25
  26 static __always_inline void
  27 libc_feholdexcept_setround_ppc (fenv_t *envp, int r)
  28 {
  29   fenv_union_t old, new;
  30
  31   old.fenv = *envp = fegetenv_register ();
  32
  33   __TEST_AND_ENTER_NON_STOP (old.l, 0ULL);
  34
  35   /* Clear everything and set the rounding mode.  */
  36   new.l = r;
  37   fesetenv_register (new.fenv);
  38 }
  39
  40 static __always_inline unsigned long long
  41 __libc_femergeenv_ppc (const fenv_t *envp, unsigned long long old_mask,
  42         unsigned long long new_mask)
  43 {
  44   fenv_union_t old, new;
  45
  46   new.fenv = *envp;
  47   old.fenv = fegetenv_register ();
  48
  49   /* Merge bits while masking unwanted bits from new and old env.  */
  50   new.l = (old.l & old_mask) | (new.l & new_mask);
  51
  52   __TEST_AND_EXIT_NON_STOP (old.l, new.l);
  53   __TEST_AND_ENTER_NON_STOP (old.l, new.l);
  54
  55   /* If requesting to keep status, replace control, and merge exceptions,
  56      and exceptions haven't changed, we can just set new control instead
  57      of the whole FPSCR.  */
  58   if ((old_mask & (FPSCR_CONTROL_MASK|FPSCR_STATUS_MASK|FPSCR_EXCEPTIONS_MASK))
  59       == (FPSCR_STATUS_MASK|FPSCR_EXCEPTIONS_MASK) &&
  60       (new_mask & (FPSCR_CONTROL_MASK|FPSCR_STATUS_MASK|FPSCR_EXCEPTIONS_MASK))
  61       == (FPSCR_CONTROL_MASK|FPSCR_EXCEPTIONS_MASK) &&
  62       (old.l & FPSCR_EXCEPTIONS_MASK) == (new.l & FPSCR_EXCEPTIONS_MASK))
  63   {
  64     fesetenv_mode (new.fenv);
  65   }
  66   else
  67     /* Atomically enable and raise (if appropriate) exceptions set in `new'.  */
  68     fesetenv_register (new.fenv);
  69
  70   return old.l;
  71 }
  72
  73 static __always_inline void
  74 libc_fesetenv_ppc (const fenv_t *envp)
  75 {
  76   /* Replace the entire environment.  */
  77   __libc_femergeenv_ppc (envp, 0LL, -1LL);
  78 }
  79
  80 static __always_inline void
  81 libc_feresetround_ppc (fenv_t *envp)
  82 {
  83   fenv_union_t new = { .fenv = *envp };
  84   fegetenv_and_set_rn (new.l & FPSCR_RN_MASK);
  85 }
  86
  87 static __always_inline int
  88 libc_feupdateenv_test_ppc (fenv_t *envp, int ex)
  89 {
  90   return __libc_femergeenv_ppc (envp, ~FPSCR_CONTROL_MASK,
  91                                 ~FPSCR_STATUS_MASK) & ex;
  92 }
  93
  94 static __always_inline void
  95 libc_feupdateenv_ppc (fenv_t *e)
  96 {
  97   libc_feupdateenv_test_ppc (e, 0);
  98 }
  99
 100 #define libc_feholdexceptf           libc_feholdexcept_ppc
 101 #define libc_feholdexcept            libc_feholdexcept_ppc
 102 #define libc_feholdexcept_setroundf  libc_feholdexcept_setround_ppc
 103 #define libc_feholdexcept_setround   libc_feholdexcept_setround_ppc
 104 #define libc_fetestexceptf           libc_fetestexcept_ppc
 105 #define libc_fetestexcept            libc_fetestexcept_ppc
 106 #define libc_fesetroundf             libc_fesetround_ppc
 107 #define libc_fesetround              libc_fesetround_ppc
 108 #define libc_fesetenvf               libc_fesetenv_ppc
 109 #define libc_fesetenv                libc_fesetenv_ppc
 110 #define libc_feupdateenv_testf       libc_feupdateenv_test_ppc
 111 #define libc_feupdateenv_test        libc_feupdateenv_test_ppc
 112 #define libc_feupdateenvf            libc_feupdateenv_ppc
 113 #define libc_feupdateenv             libc_feupdateenv_ppc
 114 #define libc_feholdsetroundf         libc_feholdsetround_ppc
 115 #define libc_feholdsetround          libc_feholdsetround_ppc
 116 #define libc_feresetroundf           libc_feresetround_ppc
 117 #define libc_feresetround            libc_feresetround_ppc
 118
 119
 120 /* We have support for rounding mode context.  */
 121 #define HAVE_RM_CTX 1
 122
 123 static __always_inline void
 124 libc_feholdsetround_ppc_ctx (struct rm_ctx *ctx, int r)
 125 {
 126   fenv_union_t old;
 127
 128   ctx->env = old.fenv = fegetenv_and_set_rn (r);
 129   ctx->updated_status = (r != (old.l & FPSCR_RN_MASK));
 130 }
 131
 132 static __always_inline void
 133 libc_feholdsetround_noex_ppc_ctx (struct rm_ctx *ctx, int r)
 134 {
 135   fenv_union_t old, new;
 136
 137   old.fenv = fegetenv_register ();
 138
 139   new.l = (old.l & ~(FPSCR_ENABLES_MASK|FPSCR_RN_MASK)) | r;
 140
 141   ctx->env = old.fenv;
 142   if (__glibc_unlikely (new.l != old.l))
 143     {
 144       __TEST_AND_ENTER_NON_STOP (old.l, 0ULL);
 145       fesetenv_mode (new.fenv);
 146       ctx->updated_status = true;
 147     }
 148   else
 149     ctx->updated_status = false;
 150 }
 151
 152 static __always_inline void
 153 libc_fesetenv_ppc_ctx (struct rm_ctx *ctx)
 154 {
 155   libc_fesetenv_ppc (&ctx->env);
 156 }
 157
 158 static __always_inline void
 159 libc_feupdateenv_ppc_ctx (struct rm_ctx *ctx)
 160 {
 161   if (__glibc_unlikely (ctx->updated_status))
 162     libc_feresetround_ppc (&ctx->env);
 163 }
 164
 165 static __always_inline void
 166 libc_feresetround_ppc_ctx (struct rm_ctx *ctx)
 167 {
 168   if (__glibc_unlikely (ctx->updated_status))
 169     libc_feresetround_ppc (&ctx->env);
 170 }
 171
 172 #define libc_fesetenv_ctx                libc_fesetenv_ppc_ctx
 173 #define libc_fesetenvf_ctx               libc_fesetenv_ppc_ctx
 174 #define libc_fesetenvl_ctx               libc_fesetenv_ppc_ctx
 175 #define libc_feholdsetround_ctx          libc_feholdsetround_ppc_ctx
 176 #define libc_feholdsetroundf_ctx         libc_feholdsetround_ppc_ctx
 177 #define libc_feholdsetroundl_ctx         libc_feholdsetround_ppc_ctx
 178 #define libc_feholdsetround_noex_ctx     libc_feholdsetround_noex_ppc_ctx
 179 #define libc_feholdsetround_noexf_ctx    libc_feholdsetround_noex_ppc_ctx
 180 #define libc_feholdsetround_noexl_ctx    libc_feholdsetround_noex_ppc_ctx
 181 #define libc_feresetround_ctx            libc_feresetround_ppc_ctx
 182 #define libc_feresetroundf_ctx           libc_feresetround_ppc_ctx
 183 #define libc_feresetroundl_ctx           libc_feresetround_ppc_ctx
 184 #define libc_feupdateenv_ctx             libc_feupdateenv_ppc_ctx
 185 #define libc_feupdateenvf_ctx            libc_feupdateenv_ppc_ctx
 186 #define libc_feupdateenvl_ctx            libc_feupdateenv_ppc_ctx
 187
 188 #include_next <fenv_private.h>
 189
 190 #endif