[Mingw-users] [mingw - StupidTechiQuestions] RE: Optimizing for the Athlon 64 under Window

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By: kristo605

I don't think a cross-compiler is necessary in this case, because the Athlon
64 is backward-compatibile with the x86 instruction set.  According to the GCC
manual, you should be ok with "-mtune=athlon64".  Just don't use "-march=athlon64"
as well:

"While picking a specific cpu-type will schedule things appropriately for that
particular chip, the compiler will not generate any code that does not run on
the i386 without the -march=cpu-type option being used."

The -mtune option merely controls instruction scheduling, i.e., "-mtune=athlon64"
alone won't give you 64-bit code.

FWIW, this question is probably better asked on a GCC mailing list.

Hope this helps.

Michael

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