[Bug tree-optimization/126143] phiopt does not flatten predicate-uniform multi-PHI diamonds: argmax-style scalar loops keep unpredictable branches at -O2

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126143

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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           Keywords|                            |missed-optimization

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Creating COND_EXPRs is something for RTL if-conversion (or vectorization
if-conversion, for the vector part).  We have no good way to cost such
transform on GIMPLE.