Refs #187. Use binary code for xgetbv, which is compatible with old compiler.

2013-01-22 00:18:21 +08:00
parent 4db6660de4
commit 8cdb795438
2 changed files with 4 additions and 2 deletions
--- a/cpuid_x86.c
+++ b/cpuid_x86.c
@@ -116,8 +116,9 @@ static inline int have_excpuid(void){

 #ifndef NO_AVX
 static inline void xgetbv(int op, int * eax, int * edx){
+  //Use binary code for xgetbv
  __asm__ __volatile__
-    ("xgetbv": "=a" (*eax), "=d" (*edx) : "c" (op) : "cc");
+    (".byte 0x0f, 0x01, 0xd0": "=a" (*eax), "=d" (*edx) : "c" (op) : "cc");
 }
 #endif