https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120032
--- Comment #6 from GCC 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:4a80eaefd93c2f1f7c9b71dbc1b97783214b7b2f commit r16-1202-g4a80eaefd93c2f1f7c9b71dbc1b97783214b7b2f Author: Richard Biener <rguent...@suse.de> Date: Thu Jun 5 14:23:06 2025 +0200 tree-optimization/120032 - CLZ matching, fallback for missing range-info The following allows us to emit a conditional move when the value of the table based CLZ/CLZ implementation at zero differs from what the target implementation guarantees or we cannot easily fixup otherwise. In that case emit a val == 0 ? table-based-zero-result : ... PR tree-optimization/120032 * tree-ssa-forwprop.cc (simplify_count_zeroes): When we cannot use the IFN to determine the result at zero use a conditional move to reproduce the correct result from the table-based algorithm. * gcc.target/i386/pr120032-3.c: New testcase.
