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