https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104162
--- Comment #7 from CVS 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:ee1cb43bc76de800efa0ade687b0cd28e62a5f82 commit r13-137-gee1cb43bc76de800efa0ade687b0cd28e62a5f82 Author: Richard Biener <rguent...@suse.de> Date: Wed Jan 26 15:34:54 2022 +0100 tree-optimization/104162 - CSE of &MEM[ptr].a[i] and ptr + CST This adds the capability to value-numbering of treating complex address expressions where the offset becomes invariant as equal to a POINTER_PLUS_EXPR. This restores CSE that is now prevented by early lowering of &MEM[ptr + CST] to a POINTER_PLUS_EXPR. Unfortunately this regresses gcc.dg/asan/pr99673.c again, so the testcase is adjusted accordingly. 2022-01-26 Richard Biener <rguent...@suse.de> PR tree-optimization/104162 * tree-ssa-sccvn.cc (vn_reference_lookup): Handle &MEM[_1 + 5].a[i] like a POINTER_PLUS_EXPR if the offset becomes invariant. (vn_reference_insert): Likewise. * gcc.dg/tree-ssa/ssa-fre-99.c: New testcase. * gcc.dg/asan/pr99673.c: Adjust.
