Quote:
Originally Posted by LigH
@ Nintendo Maniac 64:
Even AMD Athlon64/Phenom (K8-K10 arch.) support some SSE3; but x264/x265 does not use it, considers their implementation as "too slow", I believe.
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SSE3 is not particularly useful for multimedia and it's just a few instructions introduced in Presscot P4 and Venice 90nm K8.
You probably mean SSSE3 (SSS instead of SS) aka "Suplemental SSE3" which is a confusing and dumb name. Probably should have been SSE4 but got renamed for marketing reasons. Or SSE3 was not supposed to be SSE3 originally.
SSSE3 is
very useful for encoding and decoding, but only comes on Core 2 chips, and Bobcat/Bulldozer and later cores from AMD. K10 and K8 end at the not-so-important SSE3.
(Note that x265 actually needs SSSE3 + SSE4 to be useful, you are barred from most of assembly optimization if you only have SSSE3, like with 65nm Core 2s or pre-Sandy Bridge Pentium/Celeron).