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x86 MSVC does not use SSE(2) #27646

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@hanna-kruppe

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@hanna-kruppe

@cmr noticed this on IRC. On i686-pc-windows-gnu and in fact on all other i686-* triples (except iOS, which is technically called i386-*), a SSE2-capable microarchitecture is assumed. @dotdash said that this was copied from Clang. Not doing so on MSVC might be an accident, and a rather costly one.

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