Small changes for SIMD SAD/SSD float variants

	modified:   ../cvt/util/SIMD.cpp
	modified:   ../cvt/util/SIMD.h
	modified:   ../cvt/util/SIMDAVX.cpp
	modified:   ../cvt/util/SIMDAVX.h
	modified:   ../cvt/util/SIMDSSE.h
	modified:   ../cvt/util/SIMDSSE2.cpp
	modified:   ../cvt/util/SIMDSSE2.h
	modified:   ../cvt/util/SIMDTest.cpp