sysdeps/s390/fpu/math_private.h

   1 /* Configure optimized libm functions.  S390 version.
   2    Copyright (C) 2019-2020 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_PRIVATE_H
  20 #define S390_MATH_PRIVATE_H 1
  21
  22 #include <stdint.h>
  23 #include <math.h>
  24
  25 #ifdef HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT
  26 # define TOINT_INTRINSICS 1
  27
  28 static inline double_t
  29 roundtoint (double_t x)
  30 {
  31   double_t y;
  32   /* The z196 zarch "load fp integer" (fidbra) instruction is rounding
  33      x to the nearest integer with ties away from zero (M3-field: 1)
  34      where inexact exceptions are suppressed (M4-field: 4).  */
  35   __asm__ ("fidbra %0,1,%1,4" : "=f" (y) : "f" (x));
  36   return y;
  37 }
  38
  39 static inline int32_t
  40 converttoint (double_t x)
  41 {
  42   int32_t y;
  43   /* The z196 zarch "convert to fixed" (cfdbra) instruction is rounding
  44      x to the nearest integer with ties away from zero (M3-field: 1)
  45      where inexact exceptions are suppressed (M4-field: 4).  */
  46   __asm__ ("cfdbra %0,1,%1,4" : "=d" (y) : "f" (x) : "cc");
  47   return y;
  48 }
  49 #endif
  50
  51 #include_next <math_private.h>
  52
  53 #endif