http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56507
--- Comment #2 from Alexander <bratsinot at gmail dot com> 2013-03-02 13:49:39 UTC --- (In reply to comment #1) > (In reply to comment #0) > > GCC -march=native includes only flags: -mmmx -msse -msse2 -msse3 -mssse3 > > but some Core2Duo processors have -msse4 -msse4.1. > > But yours must not. GCC's -march=native uses cpuid's flags field to see if > sse4/sse4.1 is supported. > > From driver-i386.c: > __cpuid (1, eax, ebx, ecx, edx); > ... > has_sse4_1 = ecx & bit_SSE4_1; > has_sse4_2 = ecx & bit_SSE4_2; > ... > const char *sse4_2 = has_sse4_2 ? " -msse4.2" : " -mno-sse4.2"; > const char *sse4_1 = has_sse4_1 ? " -msse4.1" : " -mno-sse4.1"; I have Core2Duo E8200, this is Wolfdale and this processor include SSE4.1.
