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[Bug tree-optimization/54027] [4.8 Regression] possible mis-optimization of signed left shift in c89 mode
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 10 Aug 2012 08:34:01 +0000
- Subject: [Bug tree-optimization/54027] [4.8 Regression] possible mis-optimization of signed left shift in c89 mode
- Auto-submitted: auto-generated
- References: <bug-54027-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54027
--- Comment #5 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-08-10 08:34:01 UTC ---
Author: rguenth
Date: Fri Aug 10 08:33:57 2012
New Revision: 190286
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=190286
Log:
2012-08-10 Richard Guenther <rguenther@suse.de>
PR tree-optimization/54027
* tree-vrp.c (extract_range_from_binary_expr_1): Merge RSHIFT_EXPR
and LSHIFT_EXPR handling, force -fwrapv for the multiplication used
to handle LSHIFT_EXPR with a constant.
* gcc.dg/torture/pr54027.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/torture/pr54027.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-vrp.c