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[Bug tree-optimization/44683] [4.4/4.5/4.6 Regression] Optimization bug with copysign builtin
- From: "ebotcazou at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Sat, 22 Oct 2011 16:56:59 +0000
- Subject: [Bug tree-optimization/44683] [4.4/4.5/4.6 Regression] Optimization bug with copysign builtin
- Auto-submitted: auto-generated
- References: <bug-44683-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44683
Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |ebotcazou at gcc dot
| |gnu.org
Known to work| |
Known to fail| |
--- Comment #11 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2011-10-22 16:56:59 UTC ---
While working on a related subject, the testcase started to regress. IMHO the
fix only papers over the problem (try with -fno-trapping-math for example).
Even in the true edge of a conditional expression, you cannot infer a simple
equivalence as soon as there are or there might be signed zeros involved.