[Bug tree-optimization/88464] AVX-512 vectorization of masked scatter failing with "not suitable for scatter store"

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88464

--- Comment #20 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Uroš Bizjak from comment #19)
> FYI, there are quite some sequences like:
> 
>         kmovw   %k1, %r11d
>         testb   %r11b, %r11b
>         jne     .L63
> 
> (e.g. when compiling avx512f-pr88464-1.c).
> 
> Perhaps ktest insn can be utilized here?

It can if -mavx512dq, because we need ktestb rather than ktestw.  Or we could
do kandw first, but that would be longer (movl $255, %r11d; kmovw $r11d, %k2;
kandw %k1, %k2; ktestw %k2, %k2).  Have you tried with -mavx512dq?  I haven't
added it to dg-options of the tests, because I wanted to test the behavior
without it too and duplicating all the tests also for -mavx512dq would be too
much.