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[Bug tree-optimization/19686] [4.0 Regression] loop performance decrease, not comparing against 0
- From: "schlie at comcast dot net" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 7 Feb 2005 02:42:38 -0000
- Subject: [Bug tree-optimization/19686] [4.0 Regression] loop performance decrease, not comparing against 0
- References: <20050129065037.19686.dmixm@marine.febras.ru>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From schlie at comcast dot net 2005-02-07 02:42 -------
(In reply to comment #2)
Might it be possible to change the severity to at least "normal"
and possibly reclassify it as a "mis-optimization", as it's very
typical for folks who know processors to intentionally write
code such that compairs are agaisnt zero, as they are typically
free; having the compiler de-optimize an otherwise more effecient
explicit code fragment would seem like something that would be fairly
critical to remedy?
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19686