Hi,
The following commands showed that -msse2 has to be used with -O (or
its variants -O1, -O2, etc.) But I don't find this documented in the
gcc manual. Does anybody know where this is documented? Thanks!
~/linux/test/cpp/sse2/_mm_load_ps$ g++ -msse2 main.cpp -O -o main.exe
~/linux/test/cpp/sse2/_mm_load_ps$ ./main.exe
1
2
3
4
~/linux/test/cpp/sse2/_mm_load_ps$ g++ -msse2 main.cpp -o main.exe
~/linux/test/cpp/sse2/_mm_load_ps$ ./main.exe
Segmentation fault: 11
#include <xmmintrin.h>
#include <stdio.h>
int main() {
float p[4]={1,2,3,4};
__m128 a = _mm_load_ps(p);
float p1[4];
_mm_store_ps(p1, a);
for(int i=0; i < 4; i++) {
printf("%g\n", p1[i]);
}
}
--
Regards,
Peng
