[Bug tree-optimization/68695] [6 Regression] Performance regression related to ssa patch / ifcvt

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68695

--- Comment #12 from Richard Biener <rguenth at gcc dot gnu.org> ---
So for some reason no SSA coalescing is done for s390x here (compared to
x86_64).
That's the thing to look at, possibly related to some of the required parameter
coalescing / default def coalescing hackery.