Enable Enhanced Instruction Set

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Gabest - 17 Jun 2004 11:45 GMT

I'd like to know if there is a compiler definition set after this compiler
option, so I can adjust my code to use see/sse2 instructions as well in
those build configurations which have this option turned on.

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Carl Daniel [VC++ MVP] - 17 Jun 2004 14:33 GMT

> I'd like to know if there is a compiler definition set after this
> compiler option, so I can adjust my code to use see/sse2 instructions
> as well in those build configurations which have this option turned
> on.

This is undocumented but...

_M_IX86_FP = null for "normal" builds
_M_IX86_FP = 1 for /arch:SSE
_M_IX86_FP = 2 for /arch:SSE2

Being undocumented, I'd expect that this macro could change meaning or
disappear in any later version. However, these values do hold for VC7.1 and
Whidbey.

-cd

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Gabest - 17 Jun 2004 14:40 GMT

> This is undocumented but...
>
[quoted text clipped - 7 lines]
>
> -cd

I really hoped they existed, thank you very much!

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