https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116585
--- Comment #8 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-12 branch has been updated by Qing Zhao <qinz...@gcc.gnu.org>: https://gcc.gnu.org/g:8e5bd9b4b38f5b4fbd2a95d8f61168d9eeea97d3 commit r12-10739-g8e5bd9b4b38f5b4fbd2a95d8f61168d9eeea97d3 Author: Richard Biener <rguent...@suse.de> Date: Wed Sep 18 09:52:55 2024 +0200 tree-optimization/116585 - SSA corruption with split_constant_offset split_constant_offset when looking through SSA defs can end up picking SSA leafs that are subject to abnormal coalescing. This can lead to downstream consumers to insert code based on the result (like from dataref analysis) in places that violate constraints for abnormal coalescing. It's best to not expand defs whose operands are subject to abnormal coalescing - and not either do something when a subexpression has operands like that already. PR tree-optimization/116585 * tree-data-ref.cc (split_constant_offset_1): When either operand is subject to abnormal coalescing do no further processing. * gcc.dg/torture/pr116585.c: New testcase. (cherry picked from commit 1d0cb3b5fca69b81e69cfdb4aea0eebc1ac04750)
