https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108358
--- Comment #7 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The trunk branch has been updated by Andrew Pinski <pins...@gcc.gnu.org>: https://gcc.gnu.org/g:069caa5cea91fab3f1579ee1fdf50b923b75a6de commit r16-1113-g069caa5cea91fab3f1579ee1fdf50b923b75a6de Author: Andrew Pinski <quic_apin...@quicinc.com> Date: Thu Feb 20 22:05:38 2025 -0800 gimple-fold: Implement simple copy propagation for aggregates [PR14295] This implements a simple copy propagation for aggregates in the similar fashion as we already do for copy prop of zeroing. Right now this only looks at the previous vdef statement but this allows us to catch a lot of cases that show up in C++ code. This used to deleted aggregate copies that are to the same location (PR57361) But that was found to delete statements that are needed for aliasing markers reason. So we need to keep them around until that is solved. Note DSE will delete the statements anyways so there is no testcase added since we expose the latent bug in the same way. See https://gcc.gnu.org/pipermail/gcc-patches/2025-May/685003.html for the testcase and explaintation there. Also adds a variant of pr22237.c which was found while working on this patch. Changes since v1: * v2: change check for vuse to use default definition. Remove dest/src arguments for optimize_agr_copyprop Changed dump messages slightly. Added stats Don't delete `a = a` until aliasing markers are added. PR tree-optimization/14295 PR tree-optimization/108358 PR tree-optimization/114169 gcc/ChangeLog: * tree-ssa-forwprop.cc (optimize_agr_copyprop): New function. (pass_forwprop::execute): Call optimize_agr_copyprop for load/store statements. gcc/testsuite/ChangeLog: * gcc.dg/tree-ssa/20031106-6.c: Un-xfail. Add scan for forwprop1. * g++.dg/opt/pr66119.C: Disable forwprop since that does the copy prop now. * gcc.dg/tree-ssa/pr108358-a.c: New test. * gcc.dg/tree-ssa/pr114169-1.c: New test. * gcc.c-torture/execute/builtins/pr22237-1-lib.c: New test. * gcc.c-torture/execute/builtins/pr22237-1.c: New test. * gcc.dg/tree-ssa/pr57361.c: Disable forwprop1. * gcc.dg/tree-ssa/pr57361-1.c: New test. Signed-off-by: Andrew Pinski <quic_apin...@quicinc.com>
