sysdeps/x86_64/tst-avx.c

   1 /* Test case for preserved AVX registers in dynamic linker.
   2    Copyright (C) 2017-2020 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 #include <cpuid.h>
  20
  21 int tst_avx_aux (void);
  22
  23 static int
  24 avx_enabled (void)
  25 {
  26   unsigned int eax, ebx, ecx, edx;
  27
  28   if (__get_cpuid (1, &eax, &ebx, &ecx, &edx) == 0
  29       || (ecx & (bit_AVX | bit_OSXSAVE)) != (bit_AVX | bit_OSXSAVE))
  30     return 0;
  31
  32   /* Check the OS has AVX and SSE saving enabled.  */
  33   asm ("xgetbv" : "=a" (eax), "=d" (edx) : "c" (0));
  34
  35   return (eax & 6) == 6;
  36 }
  37
  38 static int
  39 do_test (void)
  40 {
  41   /* Run AVX test only if AVX is supported.  */
  42   if (avx_enabled ())
  43     return tst_avx_aux ();
  44   else
  45     return 77;
  46 }
  47
  48 #define TEST_FUNCTION do_test ()
  49 #include "../../test-skeleton.c"