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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
c++ - equivalent of -march=native for msvc - Stack Overflow Yes, GCC clang -march=native detects ISA extensions supported by the host system and enables all of them Is also detects what CPU it actually is, and enables -mtune=icelake-client or -mtune=znver4 or whatever which can affect instruction-selection choices and for example -mprefer-vector-width=512 on Zen 4 vs 256 on other AVX-512 CPUs
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
-march=haswell vs -march=core-avx2 vs -mavx2 - Stack Overflow What are the differences and tradeoffs between -march=haswell, -march=core-avx2, and -mavx2 for compiling avx2 intrinsics? I know that -mavx2 is a flag and -march=haswell core-avx2 are architectures which just translate to a bunch of flags So -mavx2 is a subset of the other two But beyond that, how do I choose the right one for my application?