https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110743
--- Comment #12 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Richard Biener <[email protected]>: https://gcc.gnu.org/g:6d842965024cad9f6d3588d300c11c2c2e4a2dba commit r17-1765-g6d842965024cad9f6d3588d300c11c2c2e4a2dba Author: Richard Biener <[email protected]> Date: Fri Jun 19 11:45:46 2026 +0200 tree-optimization/110743 - do not warn for bit sets/clears to uninit memory The following avoids diagnosing bit sets/clears that involve RMW cycles to uninitialized memory. This is for example exposed by __builtin_clear_padding lowering which suppresses diagnostics but those can re-surface with vectorization. PR tree-optimization/110743 * tree-ssa-uninit.cc (maybe_warn_operand): Suppress diagnostics on RMW cycles setting/clearing bits. * gcc.dg/uninit-pr110743.c: New testcase.
