On Wed, 11 Mar 2015 03:25:24 +0000 (UTC) Duncan <1i5t5.dun...@cox.net> wrote:
> > Meanwhile, the 19 new MMX instructions were a subset of Intel's SSE (v1) > instruction set. This SSE subset of 19 instructions is apparently what > mmxext actually refers to. Thus, anything with sse in the cpuflags by > definition has mmxext as well. > These flags have to be maintained for backwards compatibility, I suppose, even though mmxext no longer makes sense on newer processors. Also, why the need to even specify the string of "sse sse2 sse3 sse4_1 sse4_2 ssse3?" Each successive SSEX includes all previous instructions so only the highest "X" for a given processor would be appropriate. Frank Peters
