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On Sunday 18 January 2015 21:44:05 Michał Górny wrote: |
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> Hello, |
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> |
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> I would like to commit the following flags as cpu_flags_x86_desc. |
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> The list combines global USE flags with some local USE flags I've been |
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> able to find. |
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> |
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> |
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> 3dnow - Use the 3DNow! instruction set |
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> 3dnowext - Use the Enhanced 3DNow! instruction set |
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Those are kinda mostly dead (no new CPUs have them anymore) |
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> aes-ni - Enable support for Intel's AES instruction set (aes in cpuinfo) |
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> avx - Adds support for Advanced Vector Extensions instructions |
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> avx2 - Adds support for Advanced Vector Extensions 2 instructions |
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> fma - Use the Fused Multiply Add instruction set |
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> mmx - Use the MMX instruction set |
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Not sure if this one needs to be specified - amd64 always has it, and on x86 |
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your code should do cpu feature detection anyway |
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> mmxext - Use the Extended MMX instruction set (intersection of Enhanced |
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> 3DNow! and SSE instruction sets) (3dnowext or sse in cpuinfo) padlock - Use |
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> VIA padlock instructions |
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Kinda very dead, even more than 3dnow |
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> popcnt - Enable popcnt instruction support |
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Why?! |
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> sse - Use the SSE instruction set |
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Always exists on amd64, so this would be x86 special |
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> sse2 - Use the SSE2 instruction set |
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> sse3 - Use the SSE3 instruction set (pni in cpuinfo) |
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> sse4 - Enable SSE4 instruction support |
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> sse4_1 - Enable SSE4.1 instruction support |
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> sse4_2 - Enable SSE4.2 instruction support |
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> sse4a - Enable SSE4a instruction support |
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> ssse3 - Use the SSSE3 instruction set |
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Wow, such a wonderful mess :) |
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So half of those are obsolete/dead, and the other half you need to do proper |
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feature detection - why do we want that as useflags again? |
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