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[Bug tree-optimization/32540] [4.3 Regression] Exponential time behavior in PRE
- 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: 20 Oct 2007 10:14:53 -0000
- Subject: [Bug tree-optimization/32540] [4.3 Regression] Exponential time behavior in PRE
- References: <bug-32540-2744@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #7 from rguenth at gcc dot gnu dot org 2007-10-20 10:14 -------
I guess we just compute all 2**26 constants that can end up at the conditional
store. And indeed, the number of 'Created value .*' in the dump matches this
(modulo some constant offset). This is PPRE at work, which probably should
be limited to a sub-CFG somehow.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32540