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References: <bug-28230-7667@http.gcc.gnu.org/bugzilla/>
Subject: [Bug other/28230] -O2 -fwrapv miscompiles gcc, binutils, gzip.
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From: "pluto at agmk dot net" <gcc-bugzilla@gcc.gnu.org>
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------- Comment #8 from pluto at agmk dot net  2006-09-20 20:44 -------
(In reply to comment #7)
> and one more misscompiled program -> gzip-1.3.5.
> this time 4.1.2 with -O2 -fwrapv produces wrong code.
> 
> $ dd if=/dev/zero of=foo count=10
> $ gzip foo
> $ gzip -d foo.gz
> $ gzip: foo.gz: invalid compressed data--format violated

further investigation shows that only `-O1 -ftree-vrp -fwrapv'
miscompiles the gzip/inflate.o.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28230