https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101523
--- Comment #50 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Segher Boessenkool <seg...@gcc.gnu.org>: https://gcc.gnu.org/g:839bc42772ba7af66af3bd16efed4a69511312ae commit r14-9692-g839bc42772ba7af66af3bd16efed4a69511312ae Author: Segher Boessenkool <seg...@kernel.crashing.org> Date: Wed Mar 27 14:09:52 2024 +0000 combine: Don't combine if I2 does not change In some cases combine will "combine" an I2 and I3, but end up putting exactly the same thing back as I2 as was there before. This is never progress, so we shouldn't do it, it will lead to oscillating behaviour and the like. If we want to canonicalise things, that's fine, but this is not the way to do it. 2024-03-27 Segher Boessenkool <seg...@kernel.crashing.org> PR rtl-optimization/101523 * combine.cc (try_combine): Don't do a 2-insn combination if it does not in fact change I2.
