Dougall"Add" instructions: SSE (x86) vs SVE (ARM).
(x86 info from https://www.officedaytime.com/simd512e/ – may not be complete)
I Can't Believe It's Not Zero!@dougall If we extend our reach to AVX-512, the intel side gets quite a bit fuller =)
@dougall devil's partially in how you count, too, of course. Is PMADDUBSW "an add"? Probably not, but it gets used as one all the time.
(Love to multiply by 1 just to add some numbers.)
@dougall Are the AVX-512 instructions with rounding control / masking / broadcast all "one instruction", or are they many? ARM would tend to call them different instructions, x86 would tend to say they're all ADDPS.
@steve Good point! On the other side, I’ve also carefully dodged the fact that ARM uses the same mnemonic for all lane sizes.
@dougall Yet another reason why the lane size should have gone on the mnemonic rather than the register, as in Apple's assembly dialect... 😂
@steve true 😂 I’ve been meaning to ask – does Apple syntax double up on suffixes now that they’re not uniquely identified by the destination size? (eg FCVT.D.S or UDOT.S.H)
@steve Sorry – I probably shouldn't ask – but for anyone else wondering Apple tools (clang/otool) only use standard syntax for SVE as of Xcode 15 beta 5.