[Bug tree-optimization/107569] [13 Regression] Failure to optimize std::isfinite since r13-3596

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107569

--- Comment #50 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rgue...@gcc.gnu.org>:

https://gcc.gnu.org/g:41ade3399bd1ec9927be1bb818965831232eda4b

commit r13-6834-g41ade3399bd1ec9927be1bb818965831232eda4b
Author: Richard Biener <rguent...@suse.de>
Date:   Thu Mar 23 14:52:01 2023 +0100

    tree-optimization/107569 - avoid wrecking earlier folding in FRE/PRE

    The following avoids picking up dead code left over from folding
    during FRE/PRE, effectively undoing propagations.

            PR tree-optimization/107569
            * tree-ssa-sccvn.cc (eliminate_dom_walker::eliminate_stmt):
            Do not push SSA names with zero uses as available leader.
            (process_bb): Likewise.

            * g++.dg/opt/pr107569.C: New testcase.