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[Bug tree-optimization/31136] [4.2 Regression] FRE ignores bit-field truncation (C and C++ front-end don't produce bit-field truncation
- From: "mmitchel at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 26 Mar 2007 04:43:38 -0000
- Subject: [Bug tree-optimization/31136] [4.2 Regression] FRE ignores bit-field truncation (C and C++ front-end don't produce bit-field truncation
- References: <bug-31136-12896@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #12 from mmitchel at gcc dot gnu dot org 2007-03-26 05:43 -------
I agree with Joseph that STRIP_SIGN_NOPS should not be removing changes in
precision that may change the value and that, indeed, mode is probably being
used as an inaccurate proxy for precision.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31136