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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/101508] [9/10/11/12 Regression] Possible undefined behaviour in cpp program using "unsigned" type starting with r9-4145 Date: Mon, 24 Jan 2022 12:15:31 +0000 [thread overview] Message-ID: <bug-101508-4-vP60tQlqer@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-101508-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101508 --- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>: https://gcc.gnu.org/g:f1af8528d34418bc874ae9d993ee0dc3559972d2 commit r12-6844-gf1af8528d34418bc874ae9d993ee0dc3559972d2 Author: Richard Biener <rguenther@suse.de> Date: Mon Jan 24 11:50:06 2022 +0100 tree-optimization/102131 - fix niter analysis wrt overflow This fixes the overflow issues seen with analyzing BASE0 + STEP0 cmp BASE1 + STEP1 as BASE0 + STEP0 - STEP1 cmp BASE1 by following the logic we have when simplifying comparisons. 2022-01-24 Richard Biener <rguenther@suse.de> Jiufu Guo <guojiufu@linux.ibm.com> PR tree-optimization/100740 PR tree-optimization/101508 PR tree-optimization/101972 PR tree-optimization/102131 * tree-ssa-loop-niter.cc (number_of_iterations_cond): Properly constrain BASE0 + STEP0 cmp BASE1 + STEP1 to BASE0 + STEP0 - STEP1 cmp BASE1 transform. * gcc.dg/torture/pr100740.c: New testcase. * gcc.dg/torture/pr101508.c: Likewise. * gcc.dg/torture/pr101972.c: Likewise. * gcc.dg/torture/pr102131-1.c: Likewise. * gcc.dg/torture/pr102131-2.c: Likewise. * gcc.dg/torture/pr102131-3.c: Likewise. * gcc.dg/torture/pr102131-4.c: Likewise.
next prev parent reply other threads:[~2022-01-24 12:15 UTC|newest] Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-07-19 10:25 [Bug tree-optimization/101508] New: Possible undefined behaviour in cpp program using "unsigned" type starting from GCC 9 pnarsing at mathworks dot com 2021-07-19 10:46 ` [Bug tree-optimization/101508] [9/10/11/12 Regression] Possible undefined behaviour in cpp program using "unsigned" type starting with r9-4145 jakub at gcc dot gnu.org 2021-07-19 11:00 ` rguenth at gcc dot gnu.org 2022-01-17 14:02 ` rguenth at gcc dot gnu.org 2022-01-24 12:15 ` cvs-commit at gcc dot gnu.org [this message] 2022-01-24 12:44 ` [Bug tree-optimization/101508] [9/10/11 " rguenth at gcc dot gnu.org 2022-01-24 12:46 ` rguenth at gcc dot gnu.org
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