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What are reasons for -march=native to be detrimental With -march=native, GCC will likely vectorize loops using the more advanced and more recent AVX instruction set (supported by your processor but not on many old x86 processors) While the use of AVX instruction should speed your program up, it is not always the case in few pathological cases (less efficient code generated by compiler heuristics
How to specify -march=native using pragmas (or otherwise) in gcc Currently it will be called 370 with either "arch" or "tune" as argument depending on if -march=native 371 or -mtune=native is to be substituted 372 373 It returns a string containing new command line parameters to be 374 put at the place of the above two options, depending on what CPU 375 this is executed
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 –
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
linux - How to fix error: bad value (native) for -march= switch and . . . 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 -mtune=native, but not for -march=native The driver code is supposed to change the -march=native to be -march=XXX for your CPU
gcc - Error: bad value for -march= switch - Stack Overflow It appears the problem is with -march=arm7tdmi I think the workaround is to avoid using -march=arm7tdmi; and use -march=cpu-type, where cpu-type is one of the ones listed at 3 17 4 ARM Options of the GCC manual Here's part of the page:-march=name This specifies the name of the target ARM architecture
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?
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
-march=haswell vs -march=core-avx2 vs -mavx2 - Stack Overflow -march=core-i7 is I think just a synonym for Nehalem, which is really dumb because Nehalem (1st-gen i7) is a different microarchitecture from Sandy Bridge and later (2nd-gen i7) Intel unfortunately kept that branding through SnB's major re-architecting of the internals , although the 3-level cache with shared inclusive L3 has been a constant