https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114627
--- Comment #2 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by J?rgen Kvalsvik <j...@gcc.gnu.org>: https://gcc.gnu.org/g:a2447556a5405d2cde20afc134b90cd1d199ce04 commit r14-9864-ga2447556a5405d2cde20afc134b90cd1d199ce04 Author: Jørgen Kvalsvik <j...@lambda.is> Date: Mon Apr 8 15:19:55 2024 +0200 Generate constant at start of loop, without UB Generating the constants used for recording the edges taken for condition coverage would trigger undefined behavior when an expression had exactly 64 (== sizeof (1ULL)) conditions, as it would generate the constant for the next iteration at the end of the loop body, even if there was never a next iteration. By moving the check and constant generation to the top of the loop and hoisting the increment flag there is no opportunity for UB. PR middle-end/114627 gcc/ChangeLog: * tree-profile.cc (instrument_decisions): Generate constant at the start of loop.
