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[Bug tree-optimization/26719] [4.1/4.2 Regression] Computed (integer) table changes with -O
- 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: 16 Mar 2006 18:50:24 -0000
- Subject: [Bug tree-optimization/26719] [4.1/4.2 Regression] Computed (integer) table changes with -O
- References: <bug-26719-12374@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #2 from rakdver at gcc dot gnu dot org 2006-03-16 18:50 -------
This is a scev analysis problem; on code
D.2160_17 = (signed char) j_15;
D.2161_18 = (int) D.2160_17;
it says D.2161_18 = {0, +, 1}; however, since it wraps at 128 to -127, this is
not correct -- (int) {0, +, 1} (where the type of the chrec is char) would be.
--
rakdver at gcc dot gnu dot org changed:
What |Removed |Added
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CC| |sebastian dot pop at cri dot
| |ensmp dot fr
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26719