if I enable AVX instructions in code gen will the code just not run on CPUs without them or will they just use something else and be slower in that case?
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If we’re talking custom packers, that’ll need to be done at the level of mainCRTStartup though, since compilers are gonna introduce AVX instructions throughout the CRT initialisation (that is if you’re using the CRT). Or are we talking 2 binaries (AVX/SSE) + launcher?
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Neither - you can just compile multiple CPPs, some with AVX and some with SSE into the same binary. Presumably if you're worried about this sort of thing you are not calling the CRT for anything math-related, since it is an epic disaster! So you can just use SSE CRT.
End of conversation
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