[Bug target/112879] [14 Regression] 4% exec time regression of 525.x264_r on AMD Zen4

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112879

--- Comment #2 from Hongtao Liu <liuhongt at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #1)
> Possibly the reduc_* support in the backend now BB vectorizes unprofitable
> cases.

maybe zmm reduction, and we should have reasonable cost for reduction
vec_to_scalar.