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What are reasons for -march=native to be detrimental 7 There are plenty of reasons why a code can be slower with -march=native, although this is quite exceptional That being said, in your specific context, one possible scenario is the use of slower SIMD instructions, or more precisely different SIMD instructions finally making the program slower
Why is -march=native not enabled by default by compilers IDEs? For -O0, whether -march=native or -march=<generic> is the default still specifies the same family, so both are perfectly compatibly with -O0; and whenever another optimization level is specified, -march=native is beneficial to performance So, for me, the fact that -O0 is the default doesn't matter for -march 's default
How to set gcc option -march? - Stack Overflow I tried to set -march=i686+nommx and -march=i686,+nommx, but it's not correct! gcc reported error: error: bad value (i686,+nommx) for -march= switch I want to build my program to i686 without mmx target, how to set the -march option?
what is march parameter when compile a c file - Stack Overflow I saw these two kinds of make parameters: make -march=corei7-avx xxxx xxxx make -march-icelake-server xxxx xxx arch is understood, what's the m meaning? Where can I find which arch can be used
gcc - How is -march different from -mtune? - Stack Overflow -march=foo implies -mtune=foo unless you also specify a different -mtune This is one reason why using -march is better than just enabling options like -mavx without doing anything about tuning Caveat: -march=native on a CPU that GCC doesn't specifically recognize will still enable new instruction sets that GCC can detect, but will leave -mtune=generic Use a new enough GCC that knows about
c++ - What exactly does -march=native do? - Stack Overflow Gentoo Wiki told me the following: Warning: GCC 4 2 and above support -march=native -march=native applies additional settings beyond -march, specific to your CPU Unless you have a specific reaso
cc1plus: error: unrecognized argument in option -march=native I'm trying to cross compile OpenPano for linux arm using cmake I'm getting an error: cc1plus: error: unrecognized argument in option '-march=native' But then it says that this is a valid argumen