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[Bug rtl-optimization/13931] [3.3/3.4/4.0 Regression] combiner much slower on big basic blocks
- From: "echristo at redhat dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 7 Dec 2004 19:54:34 -0000
- Subject: [Bug rtl-optimization/13931] [3.3/3.4/4.0 Regression] combiner much slower on big basic blocks
- References: <20040130124106.13931.bonzini@gnu.org>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From echristo at redhat dot com 2004-12-07 19:54 -------
The patch was put in to stop erroneous REG_DEAD notes from being created where
they shouldn't IIRC. Now, we may be able to rerun cfg as Paolo suggests, but I
don't know for certain. Unless we can prove that new speedups do the right thing
all the time I don't think we can put them back in - there was even a note in
the old code that we didn't always do the right thing.
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What |Removed |Added
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Status|NEW |WAITING
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13931