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From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/23666] Fold does not reduce C - ~a into a + (C+1)
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------- Additional Comments From pinskia at gcc dot gnu dot org  2005-09-01 11:59 -------
(In reply to comment #1)
> Works for me on alphaev68-unknown-linux-gnu
>  tiw with 4.1.0 20050819.

And does not with 4.1.0 20050901 on i686-pc-linux-gnu or on powerpc-darwin.

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23666