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[Bug middle-end/17503] [4.0 Regression] Huge performance regression in invalid_mode_change_p
- From: "roger at eyesopen dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 15 Sep 2004 19:09:04 -0000
- Subject: [Bug middle-end/17503] [4.0 Regression] Huge performance regression in invalid_mode_change_p
- References: <20040915165050.17503.drow@gcc.gnu.org>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From roger at eyesopen dot com 2004-09-15 19:09 -------
I find it extremely unlikely that the patch mentioned in comment #2 could have
any performance impact, even on code that declares register variables which
should be the only observable functionality change.
Daniel, I wonder whether you could re-run your profiles after reverting my
patch and confirm there's no performance change, i.e. that it's innocent?
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17503