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[Bug tree-optimization/60930] [4.8/4.9/4.10 Regression] Wrong folding of - ((unsigned long long) a * (unsigned long long) (unsigned int)-1)
- From: "wschmidt at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 02 May 2014 21:49:58 +0000
- Subject: [Bug tree-optimization/60930] [4.8/4.9/4.10 Regression] Wrong folding of - ((unsigned long long) a * (unsigned long long) (unsigned int)-1)
- Auto-submitted: auto-generated
- References: <bug-60930-4 at http dot gcc dot gnu dot org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60930
--- Comment #13 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Author: wschmidt
Date: Fri May 2 21:49:26 2014
New Revision: 210020
URL: http://gcc.gnu.org/viewcvs?rev=210020&root=gcc&view=rev
Log:
[gcc]
2014-05-02 Bill Schmidt <wschmidt@linux.vnet.ibm.com>
PR tree-optimization/60930
* gimple-ssa-strength-reduction.c (create_mul_imm_cand): Reject
creating a multiply candidate by folding two constant
multiplicands when the result overflows.
[gcc/testsuite]
2014-05-02 Bill Schmidt <wschmidt@linux.vnet.ibm.com>
PR tree-optimization/60930
* gcc.dg/torture/pr60930.c: New test.
Added:
branches/gcc-4_9-branch/gcc/testsuite/gcc.dg/torture/pr60930.c
Modified:
branches/gcc-4_9-branch/gcc/ChangeLog
branches/gcc-4_9-branch/gcc/gimple-ssa-strength-reduction.c
branches/gcc-4_9-branch/gcc/testsuite/ChangeLog