sysdeps/powerpc/powerpc64/fpu/multiarch/s_llroundf.c

   1 /* Multiple versions of llroundf.
   2    Copyright (C) 2017-2019 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    <http://www.gnu.org/licenses/>.  */
  18 /* Redefine lroundf/__lroundf so that the compiler won't complain about
  19    the type mismatch with the IFUNC selector in strong_alias below.  */
  20 #define lroundf __hidden_lroundf
  21 #define __lroundf __hidden___lroundf
  22
  23 #include <math.h>
  24 #undef lroundf
  25 #undef __lroundf
  26 #include "init-arch.h"
  27 #include <libm-alias-float.h>
  28
  29 extern __typeof (__llroundf) __llroundf_ppc64 attribute_hidden;
  30 extern __typeof (__llroundf) __llround_power6x attribute_hidden;
  31 extern __typeof (__llroundf) __llround_power8 attribute_hidden;
  32
  33 /* The ppc64 ABI passes float and double parameters in 64bit floating point
  34    registers (at least up to a point) as IEEE binary64 format, so effectively
  35    of "double" type.  Both l[l]round and l[l]roundf return long type.  So these
  36    functions have identical signatures and functionality, and can use a
  37    single implementation.  */
  38 libc_ifunc (__llroundf,
  39             (hwcap2 & PPC_FEATURE2_ARCH_2_07)
  40             ? __llround_power8 :
  41             (hwcap & PPC_FEATURE_POWER6_EXT)
  42             ? __llround_power6x
  43             : __llroundf_ppc64);
  44
  45 libm_alias_float (__llround, llround)
  46 strong_alias (__llroundf, __lroundf)
  47 libm_alias_float (__lround, lround)