sysdeps/x86_64/tst-avx512.c

   1 /* Test case for preserved AVX512 registers in dynamic linker.
   2    Copyright (C) 2017-2023 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_avx512_aux (void);
  22
  23 static int
  24 avx512_enabled (void)
  25 {
  26 #ifdef bit_AVX512F
  27   unsigned int eax, ebx, ecx, edx;
  28
  29   if (__get_cpuid (1, &eax, &ebx, &ecx, &edx) == 0
  30       || (ecx & (bit_AVX | bit_OSXSAVE)) != (bit_AVX | bit_OSXSAVE))
  31     return 0;
  32
  33   __cpuid_count (7, 0, eax, ebx, ecx, edx);
  34   if (!(ebx & bit_AVX512F))
  35     return 0;
  36
  37   asm ("xgetbv" : "=a" (eax), "=d" (edx) : "c" (0));
  38
  39   /* Verify that ZMM, YMM and XMM states are enabled.  */
  40   return (eax & 0xe6) == 0xe6;
  41 #else
  42   return 0;
  43 #endif
  44 }
  45
  46 static int
  47 do_test (void)
  48 {
  49   /* Run AVX512 test only if AVX512 is supported.  */
  50   if (avx512_enabled ())
  51     return tst_avx512_aux ();
  52   else
  53     return 77;
  54 }
  55
  56 #define TEST_FUNCTION do_test ()
  57 #include "../../test-skeleton.c"