[Bug tree-optimization/126142] Missed vectorization: std::max_element-style pointer-iterator argmax loops stay scalar (no integer index in the IR)

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126142

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
             Blocks|                            |53947

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
There's the IVCANON pass which would insert a counting IV, but this is really
PR88259 for the case of reducing the index but not the maximum value (PRE
transforms it to a more similar case).


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53947
[Bug 53947] [meta-bug] vectorizer missed-optimizations