https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109944
Alexander Monakov <amonakov at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |amonakov at gcc dot gnu.org
--- Comment #5 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #3)
> so we're building SImode elements in %xmm regs and then
> unpack them - that's probably better than a series of
> pinsrw due to dependences. For uarchs where grp->xmm
> moves are costly it might be better to do
>
> pxor %xmm0, %xmm0
> pinsrw $0, (%rsi), %xmm0
> pinsrw $1, 32(%rsi), %xmm0
>
> though?
I'm afraid that is impossible, pinsrw will attempt to load 2 bytes, but only 1
is accessible (if at end of page).
