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