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[Bug tree-optimization/32073] Loop unrolling does not exploit VRP for loop bound
- From: "rguenth at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 24 May 2007 21:48:10 -0000
- Subject: [Bug tree-optimization/32073] Loop unrolling does not exploit VRP for loop bound
- References: <bug-32073-14600@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #1 from rguenth at gcc dot gnu dot org 2007-05-24 22:48 -------
VRP information is not preserved over optimization passes, so loop unrolling
does not know about it. But VRP recognizes that count is <= 4.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rguenth at gcc dot gnu dot
| |org, rakdver at gcc dot gnu
| |dot org
Status|UNCONFIRMED |NEW
Component|c++ |tree-optimization
Ever Confirmed|0 |1
Keywords| |missed-optimization
Last reconfirmed|0000-00-00 00:00:00 |2007-05-24 22:48:10
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32073