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[Bug middle-end/37921] __builtin_constant_p seems to be giving false positives
- From: "manu at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 2 Jan 2010 20:33:26 -0000
- Subject: [Bug middle-end/37921] __builtin_constant_p seems to be giving false positives
- References: <bug-37921-12259@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #9 from manu at gcc dot gnu dot org 2010-01-02 20:33 -------
(In reply to comment #8)
> Re-confirmed. The issue is that we fold __builtin_constant_p only after
> VRP1 so the dead code remains and we warn about it.
Perhaps this is the root cause of both PR35392 and PR35903.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37921