/* Portable C Implementation */ int Foo(int); /* Use C version on MMX processors */ #define Foo_MMX Foo /* Hand-tuned SSE implementation */ int Foo_SSE(int) /* Use SSE version on SSE2 processors */ #define Foo_SSE2 Foo_SSE
Example 3: Sample header.
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/* Portable C Implementation */ int Foo(int); /* Use C version on MMX processors */ #define Foo_MMX Foo /* Hand-tuned SSE implementation */ int Foo_SSE(int) /* Use SSE version on SSE2 processors */ #define Foo_SSE2 Foo_SSE
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