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[Bug tree-optimization/22348] [4.0/4.1 Regression] IV canonicalization causes execution of loops past their end condition
- From: "rakdver at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 15 Jul 2005 10:09:16 -0000
- Subject: [Bug tree-optimization/22348] [4.0/4.1 Regression] IV canonicalization causes execution of loops past their end condition
- References: <20050707165800.22348.matt+gccbugs@ucc.asn.au>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From rakdver at gcc dot gnu dot org 2005-07-15 10:09 -------
extract_muldiv(51 - 7, 3, FLOOR_MOD_EXPR) returns incorrectly 0.
The reason is that 51 - 7 is replaced with 51 + ~6, and both 51 and ~6 are
divisible by 3, so the result obviously is 0 :-) Someone forgot about overflows.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22348