My machine is Core2 microarchitecture and I try to compile some arithmetic codes by using the SSE instruction set. I search on the web and official manual, the answer is everything I need to do （in simplest way） to add the flag: march=native, because my chip support SSE. But when I use "gcc -march=native -Q --help=target -v" to check if the flag really works, the results display on the screen is a little bit beyond expectation, like：-msse [disabled]-msse2 [disabled]-msse2avx [disabled]-msse3 [disabled]-msse4 [disabled]-msse4.1 [disabled]-msse4.2 [disabled]-msse4a [disabled]-msse5-msseregparm [disabled]-mssse3 [disabled]I find all the SSE (even MMX) is disabled. Can any body tell me why and how to solve it? Many thanks！PS: I know,an alternative way to active the option is to add the flags like -mmsse ...manually. But, I am just curiosity, why march=native doesn't works in my system:core2,Ubuntu 12.04(64bit system), gcc 4.6.3 -- View this message in context: http://gcc.1065356.n5.nabble.com/Unable-to-ative-the-SSE-instruction-set-byadding-compile-flag-march-native-in-gcc-tp964751.html Sent from the gcc - Help mailing list archive at Nabble.com.
