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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/103417] [12 Regression] wrong code at -O1 and above on x86_64-linux-gnu since r12-5489 Date: Wed, 24 Nov 2021 21:16:18 +0000 [thread overview] Message-ID: <bug-103417-4-FephNCPGAg@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-103417-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103417 --- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> --- generic_simplify_GE_EXPR is called with BIT_FIELD_REF <c, 32, 0> & 4294967040U and 0U arguments, and transforms that into BIT_FIELD_REF <c, 32, 0> <= 255. That is wrong, (BIT_FIELD_REF <c, 32, 0> & 4294967040U) >= 0U is always true (anything >= 0U is true).
next prev parent reply other threads:[~2021-11-24 21:16 UTC|newest] Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-11-24 20:49 [Bug tree-optimization/103417] New: wrong code at -O1 and above on x86_64-linux-gnu zhendong.su at inf dot ethz.ch 2021-11-24 21:02 ` [Bug tree-optimization/103417] " pinskia at gcc dot gnu.org 2021-11-24 21:02 ` [Bug tree-optimization/103417] [12 Regression] " pinskia at gcc dot gnu.org 2021-11-24 21:03 ` [Bug tree-optimization/103417] [12 Regression] wrong code at -O1 and above on x86_64-linux-gnu since r12-5489 jakub at gcc dot gnu.org 2021-11-24 21:16 ` jakub at gcc dot gnu.org [this message] 2021-11-24 21:45 ` jakub at gcc dot gnu.org 2021-11-25 2:44 ` tnfchris at gcc dot gnu.org 2021-11-25 9:48 ` cvs-commit at gcc dot gnu.org 2021-11-25 15:22 ` jakub at gcc dot gnu.org
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