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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
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
linux - How to fix error: bad value (native) for -march= switch and . . . How to fix error: bad value (native) for -march= switch and -mtune= switch? The problem is with -march=nartive According to Ian Lance Taylor on GCC's mailing list (Ian is one of the GCC devs): The problem is that the driver code is not working, and the bug is that gcc doesn't handle that [-march=native] correctly There is some code in gcc to handle the driver code failing, and it works for
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
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
What are my available march mtune options? - Stack Overflow Is there a way to get gcc to output the available -march=arch options? I'm getting build errors (tried -march=x86_64) and I don't know what my options are The compiler I'm using is a proprietary
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
What is the default for gcc -march option? - Stack Overflow There is no `-march=generic' option because `-march' indicates the instruction set the compiler can use, and there is no generic instruction set applicable to all processors In contrast, `-mtune' indicates the processor (or, in this case, collection of processors) for which the code is optimized
How to see which flags -march=native will activate? I'm compiling my C++ app using GCC 4 3 Instead of manually selecting the optimization flags I'm using -march=native, which in theory should add all optimization flags applicable to the hardware I'm