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From: ebotcazou@gcc.gnu.org
To: Petr.Savicky@cuni.cz, gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org,
	nobody@gcc.gnu.org
Subject: Re: optimization/7719: gcc with -O2 generates wrong code
Date: Wed, 19 Feb 2003 08:35:00 -0000	[thread overview]
Message-ID: <20030219083513.11271.qmail@sources.redhat.com> (raw)

Synopsis: gcc with -O2 generates wrong code

State-Changed-From-To: open->feedback
State-Changed-By: ebotcazou
State-Changed-When: Wed Feb 19 08:35:13 2003
State-Changed-Why:
    Probably not a bug. On x86, at -O2, floating point values
    may be kept in FP registers when doing comparison with
    others stored in memory. Now x86 FP registers have
    extra-precision over a 'double', which may invalid
    an equality comparison. Compile your code with '-ffloat-store'
    if it relies on exact IEEE floating-point semantics.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7719


             reply	other threads:[~2003-02-19  8:35 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-02-19  8:35 ebotcazou [this message]
  -- strict thread matches above, loose matches on Subject: below --
2003-03-14 11:30 ebotcazou
2003-02-19 14:56 Eric Botcazou
2003-02-19 14:16 Petr.Savicky
2002-08-25 18:16 Petr.Savicky

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