Don't use xgetbv instruction when NO_AVX=1

README.md

@@ -79,7 +79,7 @@ If you compile this lib with USE_OPENMP=1, you should set OMP_NUM_THREADS enviro
 
 ### Set the number of threads on runtime. 
 
-We provided the below functions to controll the number of threads on runtime. So far, we didn't support changing the number of threads on Windows. On Windows, these functions are dummy.
+We provided the below functions to controll the number of threads on runtime.
 
     void goto_set_num_threads(int num_threads);
 
@@ -97,6 +97,7 @@ OpenBLAS users mailing list: http://list.rdcps.ac.cn/mailman/listinfo/openblas
 Please see Changelog.txt to obtain the differences between GotoBLAS2 1.13 BSD version.
 
 ## Troubleshooting
+* Please read [Faq](https://github.com/xianyi/OpenBLAS/wiki/Faq) at first.
 * Please use gcc version 4.6 and above to compile Sandy Bridge AVX kernels on Linux/MingW/BSD.
 * Please use Clang version 3.1 and above to compile the library on Sandy Bridge microarchitecture. The Clang 3.0 will generate the wrong AVX binary code.
 * The number of CPUs/Cores should less than or equal to 256. 

cpuid_x86.c

@@ -114,12 +114,15 @@ static inline int have_excpuid(void){
   return eax & 0xffff;
 }
 
+#ifndef NO_AVX
 static inline void xgetbv(int op, int * eax, int * edx){
   __asm__ __volatile__
     ("xgetbv": "=a" (*eax), "=d" (*edx) : "c" (op) : "cc");
 }
+#endif
 
 int support_avx(){
+#ifndef NO_AVX
   int eax, ebx, ecx, edx;
   int ret=0;
   
@@ -131,8 +134,12 @@ int support_avx(){
     }
   }
   return ret;
+#else
+  return 0;
+#endif
 }
 
+
 int get_vendor(void){
   int eax, ebx, ecx, edx;
   char vendor[13];

driver/others/dynamic.c

@@ -76,12 +76,15 @@ extern gotoblas_t  gotoblas_SANDYBRIDGE;
 
 #define BITMASK(a, b, c) ((((a) >> (b)) & (c)))
 
+#ifndef NO_AVX
 static inline void xgetbv(int op, int * eax, int * edx){
   __asm__ __volatile__
     ("xgetbv": "=a" (*eax), "=d" (*edx) : "c" (op) : "cc");
 }
+#endif
 
 int support_avx(){
+#ifndef NO_AVX
   int eax, ebx, ecx, edx;
   int ret=0;
   
@@ -93,6 +96,9 @@ int support_avx(){
     }
   }
   return ret;
+#else
+  return 0;
+#endif
 }
 
 static int get_vendor(void){