Find supported SIMD extensions by requesting cpuid. When an SIMD extension is found, the -m"simdextensionname" is added to SIMD_FLAGS if compiler supports it. For example, if "sse2" is available, then "-msse2" is added to SIMD_FLAGS.
This macro calls:
HAVE_MMX / HAVE_SSE / HAVE_SSE2 / HAVE_SSE3 / HAVE_SSSE3 / HAVE_SSE4.1 / HAVE_SSE4.2 / HAVE_AVX
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Copyright © 2007 Christophe Tournayre firstname.lastname@example.org
Copyright © 2013 Michael Petch email@example.com
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