Add xcr0 (os support) check

2019-01-05 18:07:14 +01:00
parent 0afaae4b23
commit 68eb3146ce
1 changed files with 2 additions and 0 deletions
--- a/cpuid_x86.c
+++ b/cpuid_x86.c
@@ -239,6 +239,8 @@ int support_avx512(){
      ret=0;  //OS does not even support AVX2
  }
  if((ebx & (1<<31)) != 0){
+    xgetbv(0, &eax, &edx); 
+    if((eax & 0xe0) == 0xe0)
      ret=1;  //OS supports AVX512VL
  }
  return ret;