Re: PATCH] x86: Compile avx2-vpcmpgtq-1.c with -fno-fuse-ops-with-volatile-access

[Hongtao Liu]

On Mon, Dec 8, 2025 at 1:42 PM H.J. Lu <hjl.to...@gmail.com> wrote:
>
> When -march=cascadelake is added, we generate
>
> vmovdqa x(%rip), %ymm0
> vpcmpq $1, x(%rip), %ymm0, %k0
> vpmovm2q %k0, %ymm0
> vmovdqa %ymm0, x(%rip)
>
> instead of
>
> vmovdqa x(%rip), %ymm1
> vmovdqa x(%rip), %ymm0
> vpcmpgtq %ymm1, %ymm0, %ymm0
> vmovdqa %ymm0, x(%rip)
>
> Compile avx2-vpcmpgtq-1.c with -fno-fuse-ops-with-volatile-access to
> generate vpcmpgtq instead of vpcmpq.
>
> PR target/122343
> * gcc.target/i386/avx2-vpcmpgtq-1.c: Compile with
> -fno-fuse-ops-with-volatile-access.

I didn't see the patch, but I think it should be an obvious patch.
>
>
> --
> H.J.



-- 
BR,
Hongtao