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From: "law at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/105517] New: [13 Regression] Missing diagnostic after recent optimizer improvements Date: Sat, 07 May 2022 15:12:49 +0000 [thread overview] Message-ID: <bug-105517-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105517 Bug ID: 105517 Summary: [13 Regression] Missing diagnostic after recent optimizer improvements Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: law at gcc dot gnu.org Target Milestone: --- This change: commit ee1cb43bc76de800efa0ade687b0cd28e62a5f82 Author: Richard Biener <rguenther@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 <rguenther@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. Is causing various ports (ft32-elf for example) to fail the Warray-bounds.c test: Running /home/jlaw/test/gcc/gcc/testsuite/gcc.dg/dg.exp ... FAIL: c-c++-common/Warray-bounds.c -Wc++-compat (test for warnings, line 187) FAIL: c-c++-common/Warray-bounds.c -Wc++-compat (test for warnings, line 188) I think you ought to be able to see this with just a cross compiler and shouldn't need a full cross environment. I haven't debugged this in any way other than bisection.
next reply other threads:[~2022-05-07 15:12 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-05-07 15:12 law at gcc dot gnu.org [this message] 2022-05-09 8:08 ` [Bug tree-optimization/105517] " rguenth at gcc dot gnu.org 2022-05-09 9:33 ` rguenth at gcc dot gnu.org 2022-05-09 11:42 ` cvs-commit at gcc dot gnu.org 2022-05-09 11:46 ` rguenth at gcc dot gnu.org
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