search for: dhave_mmx

...ants and I have implemented several variants: C, MMX assembly and MMXEXT assembly (something like SSE maybe, recent extensions apparently, found in PIII and Athlon). Preprocessor directive HAVE_MMX and HAVE_MMXEXT allow to select at compile-time which code gets used for real. So, use CFLAGS="-DHAVE_MMX" to get the MMX implementation, and CFLAGS="-DHAVE_MMX -DHAVE_MMXEXT" to get the MMXEXT implementation (which uses both MMX and extMMX instructions). The wrappers also allow back-to-back testing of the C and assembly implementations (very useful for testing). Use -DTEST_MMX for this...