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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/103266] [12 regression] llvm-13 miscompilation: __builtin_assume_aligned causes over-aggressive dce
Date: Thu, 18 Nov 2021 17:42:06 +0000 [thread overview]
Message-ID: <bug-103266-4-VZ2CKC5Lxt@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-103266-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103266
--- Comment #8 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jan Hubicka <hubicka@gcc.gnu.org>:
https://gcc.gnu.org/g:c331a75d49b6043399f5ccce72a02ccf3b0ddc56
commit r12-5379-gc331a75d49b6043399f5ccce72a02ccf3b0ddc56
Author: Jan Hubicka <jh@suse.cz>
Date: Thu Nov 18 18:41:43 2021 +0100
Fix modref wrt __builtin_assume_aligned
__builtin_assume_aligned has bit contraictionary fnspec description "1cX "
which means that parameter 1 is returned but also unused. PTA code takes
precedence to parameter being returned, while modref takes the info that
parameter is unused. This patch tweaks modref to follow PTA semantics (as
suggested by Richard in the PR log)
gcc/ChangeLog:
2021-11-18 Jan Hubicka <hubicka@ucw.cz>
PR ipa/103266
* ipa-modref.c (modref_eaf_analysis::merge_call_lhs_flags): Unused
parameter may still be returned.
(modref_eaf_analysis::analyze_ssa_name): Call merge_call_lhs_flags
even for unused function args.
gcc/testsuite/ChangeLog:
2021-11-18 Jan Hubicka <hubicka@ucw.cz>
PR ipa/103266
* g++.dg/torture/pr103266.C: New test.
next prev parent reply other threads:[~2021-11-18 17:42 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-15 19:24 [Bug tree-optimization/103266] New: " slyfox at gcc dot gnu.org
2021-11-15 19:45 ` [Bug tree-optimization/103266] " jakub at gcc dot gnu.org
2021-11-15 21:15 ` hubicka at gcc dot gnu.org
2021-11-15 21:33 ` hubicka at gcc dot gnu.org
2021-11-16 7:26 ` rguenther at suse dot de
2021-11-16 10:03 ` hubicka at kam dot mff.cuni.cz
2021-11-16 10:23 ` rguenther at suse dot de
2021-11-18 17:08 ` hubicka at gcc dot gnu.org
2021-11-18 17:42 ` cvs-commit at gcc dot gnu.org [this message]
2021-11-20 10:34 ` hubicka at gcc dot gnu.org
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