[Bug target/52572] suboptimal assignment to avx element

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52572

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |enhancement
   Last reconfirmed|                            |2021-12-25
             Target|                            |x86_64-linux-gnu
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
LLVM produces:

        vxorps  %xmm1, %xmm1, %xmm1
        vblendps        $3, %ymm1, %ymm0, %ymm0         # ymm0 =
ymm1[0,1],ymm0[2,3,4,5,6,7]

and

        vxorps  %xmm0, %xmm0, %xmm0
        vblendps        $252, (%rdi), %ymm0, %ymm0      # ymm0 =
ymm0[0,1],mem[2,3,4,5,6,7]

Which I suspect is better.