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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, 20 Jul 2012 09:37:54 +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
Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Keywords| |wrong-code
Last reconfirmed| |2012-07-20
Component|c |tree-optimization
AssignedTo|unassigned at gcc dot |rguenth at gcc dot gnu.org
|gnu.org |
Ever Confirmed|0 |1
Summary|possible mis-optimization |[4.8 Regression] possible
|of signed left shift in c89 |mis-optimization of signed
|mode |left shift in c89 mode
Target Milestone|--- |4.8.0
--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-07-20 09:37:54 UTC ---
Mine. This is VRPs handling of left-shifts via the multiplication code. I
didn't know this was implementation defined.