rust-lang
Missing x86/_64 MMX functions
It seems like _mm_empty, _mm_madd_pi16, _mm_xor_si64 and a handful of other simd functions don't exist, neither in stable nor behind the stdsimd feature. In fact, it seems like the remaining TODO list in #40 is unimplemented.
I was just wondering if there is any technical reason for these missing functions, or have they just not been implemented yet?
Thanks!
Ah if these are missing it's just by mistake! Then can be added at any time :)
Ah, that's good to know! So most of the functions that I've found to be missing seem to be in the aforementioned TODO list under MMX & SSE. I've also found these two which aren't listed there: _mm_cvtph_ps & _mm_mulhrs_pi16 but can be found in the standard C SIMD headers
Edit: Another one not listed which seems to be missing: _mm_setr_epi64x. I can't find it in the intel intrinsics guide, but seems to be a thing from what I've read... and _mm_set_epi64x is the corresponding non reverse initializer
Ah so we haven't actually stabilized (or pursued too aggressively) the MMX-related intrinsics as they have weird ABI issues in LLVM and don't seem to be too widely used in the wild (those intrinsics with __m64), but we can always add them as unstable at least!
Direct MMX support is no longer in scope for std::arch, see:
- https://github.com/rust-lang/stdarch/pull/890
