[Bug tree-optimization/115843] [14/15 Regression] 531.deepsjeng_r fails to verify with -O3 -march=znver4 --param vect-partial-vector-usage=2

[liuhongt at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115843

Hongtao Liu <liuhongt at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |liuhongt at gcc dot gnu.org

--- Comment #9 from Hongtao Liu <liuhongt at gcc dot gnu.org> ---
Observed one miss-optimization:

        kxorw   %k4, %k4, %k4 # 262     [c=4 l=4]  *movqi_internal/14
        vmovdqu64       %zmm0, KingPressureMask1-120(%rip){%k4}       # 44 
[c=65 l=10]  avx512f_storev8di_mask
        vmovdqu64       %zmm0, KingPressureMask1-56(%rip){%k4}        # 47   
[c=65 l=10]  avx512f_storev8di_mask

when mask is 0, maskstore can be optimized off.