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From: "joseph at codesourcery dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/52907] Underflowing floating point expressions wrongly folded to zero
Date: Mon, 23 Apr 2012 20:03:00 -0000	[thread overview]
Message-ID: <bug-52907-4-rWEXjCzRBy@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-52907-4@http.gcc.gnu.org/bugzilla/>

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52907

--- Comment #2 from joseph at codesourcery dot com <joseph at codesourcery dot com> 2012-04-23 20:02:50 UTC ---
On Tue, 10 Apr 2012, rguenth at gcc dot gnu.org wrote:

> Does real.c even communicate this fact?

You can identify underflow from the result of multiplication or division 
being zero or subnormal (unless an operand is zero or infinite), just as 
overflow is identified from an infinite result.  Information about 
subnormal results may not be conveniently communicated by real.c, but 
simply handling zero results here would be enough for the use cases in 
glibc.


  parent reply	other threads:[~2012-04-23 20:03 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-04-08 21:45 [Bug tree-optimization/52907] New: " jsm28 at gcc dot gnu.org
2012-04-10 12:20 ` [Bug tree-optimization/52907] " rguenth at gcc dot gnu.org
2012-04-23 20:03 ` joseph at codesourcery dot com [this message]
2024-03-11  0:09 ` [Bug middle-end/52907] " pinskia at gcc dot gnu.org

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