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From: Eric Botcazou <ebotcazou@libertysurf.fr>
To: nobody@gcc.gnu.org
Cc: gcc-prs@gcc.gnu.org,
Subject: Re: optimization/9052: in C code, "if" statement fails to execute  if optimized
Date: Wed, 12 Feb 2003 16:56:00 -0000	[thread overview]
Message-ID: <20030212165600.23755.qmail@sources.redhat.com> (raw)

The following reply was made to PR optimization/9052; it has been noted by GNATS.

From: Eric Botcazou <ebotcazou@libertysurf.fr>
To: Richard.Earnshaw@arm.com
Cc: Steven Bosscher <s.bosscher@student.tudelft.nl>,
 gcc-gnats@gcc.gnu.org,
 gcc-bugs@gcc.gnu.org,
 nobody@gcc.gnu.org,
 phama@webjockey.net
Subject: Re: optimization/9052: in C code, "if" statement fails to execute  if optimized
Date: Wed, 12 Feb 2003 17:55:22 +0100

 > Adding -ffloat-store will probably also make the "misbehaviour" go away.
 
 It does.
 
 > GCC is almost certainly using the register result from the current
 > iteration to compare with the memory result from an earlier iteration.
 > Since the register result has excess precision the compare for equality
 > fails.  That's not a bug, it's just the FP works on the X86.
 >
 > So in summary, almost certainly "not a bug".
 
 I fully concur. I think the PR can be closed.
 
 -- 
 Eric Botcazou


             reply	other threads:[~2003-02-12 16:56 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-02-12 16:56 Eric Botcazou [this message]
  -- strict thread matches above, loose matches on Subject: below --
2003-02-18 10:41 ebotcazou
2003-02-14 21:16 Toon Moene
2003-02-13 21:56 Eric Botcazou
2003-02-13 19:46 Toon Moene
2003-02-13 11:56 Eric Botcazou
2003-02-12 17:06 Steven Bosscher
2003-02-12 16:46 Richard Earnshaw
2003-02-12 16:36 Steven Bosscher
2003-02-12 16:26 Richard Earnshaw
2003-02-12 15:26 Steven Bosscher
2002-12-24  5:36 phma

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