sysdeps/s390/fpu/math-barriers.h

   1 /* Control when floating-point expressions are evaluated.  s390 version.
   2    Copyright (C) 2019-2021 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 S390_MATH_BARRIERS_H
  20 #define S390_MATH_BARRIERS_H 1
  21
  22 #ifdef HAVE_S390_VX_GCC_SUPPORT
  23 # define ASM_CONSTRAINT_VR "v"
  24 #else
  25 # define ASM_CONSTRAINT_VR
  26 #endif
  27
  28 #define math_opt_barrier(x)                                             \
  29   ({ __typeof (x) __x = (x);                                            \
  30     if (__builtin_types_compatible_p (__typeof (x), _Float128))         \
  31       __asm__ ("# math_opt_barrier_f128 %0" : "+fm" (__x));             \
  32     else                                                                \
  33       __asm__ ("# math_opt_barrier %0"                                  \
  34                : "+f" ASM_CONSTRAINT_VR "m" (__x));                     \
  35     __x; })
  36 #define math_force_eval(x)                                              \
  37   ({ __typeof (x) __x = (x);                                            \
  38     if (__builtin_types_compatible_p (__typeof (x), _Float128))         \
  39       __asm__ __volatile__ ("# math_force_eval_f128 %0"                 \
  40                             : : "fm" (__x));                            \
  41     else                                                                \
  42       __asm__ __volatile__ ("# math_force_eval %0"                      \
  43                             : : "f" ASM_CONSTRAINT_VR "m" (__x));       \
  44   })
  45
  46 #endif