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[Bug middle-end/33611] [4.1/4.2/4.3 regression] Optimizations generate incorrect code
- From: "macracan at yahoo dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 1 Oct 2007 17:43:01 -0000
- Subject: [Bug middle-end/33611] [4.1/4.2/4.3 regression] Optimizations generate incorrect code
- References: <bug-33611-15175@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #4 from macracan at yahoo dot com 2007-10-01 17:43 -------
(In reply to comment #3)
> For once a real floating point bug. In this code
> double p = 0.422244 * f[a.e];
> if (f[0] < p)
>
> with a.e=1, f[1]=0.285433, we should calculate p=0.285433. Since
> f[0]=0.0461109, we shouldn't enter the if-clause, but we do when
Sorry, but this isn't quite accurate; the math is off, and the code _should_
enter
the if branch the first time around, just not the second time around.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33611