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From: "evancheng at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug target/24418] Redudant compare to zero not eliminated Date: Tue, 25 Oct 2005 22:55:00 -0000 [thread overview] Message-ID: <20051025225521.11711.qmail@sourceware.org> (raw) In-Reply-To: <bug-24418-11457@http.gcc.gnu.org/bugzilla/> ------- Comment #4 from evancheng at gcc dot gnu dot org 2005-10-25 22:55 ------- Closing this. It's not a bug. It's not safe to eliminate the cmpl. Its result are read by je and jg: je reads ZF, jg reads ZF and OF. Now consider subl 0x80000000 0x1 (OF <- 1) cmpl 0x7fffffff (OF <- 0) -- evancheng at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution| |INVALID http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24418
prev parent reply other threads:[~2005-10-25 22:55 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2005-10-18 0:01 [Bug rtl-optimization/24418] New: " evancheng at gcc dot gnu dot org 2005-10-18 0:02 ` [Bug rtl-optimization/24418] " evancheng at gcc dot gnu dot org 2005-10-18 0:07 ` pinskia at gcc dot gnu dot org 2005-10-18 0:10 ` pinskia at gcc dot gnu dot org 2005-10-25 22:55 ` evancheng at gcc dot gnu dot org [this message]
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