Bug#339319: marked as done (Bug in fesetenv() [LIBC6.1])
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and subject line Bug#339319: Bug in fesetenv() [LIBC6.1]
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Subject: Bug in fesetenv() [LIBC6.1]
From: Juan Jose Garcia Ripoll <jlr@mpq.mpg.de>
To: submit@bugs.debian.org
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Date: Tue, 15 Nov 2005 14:50:37 +0100
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Package: libc6.1
Version: 2.2.5-11.5
Architecture: Linux usf-cf-alpha-linux-1 2.2.20 #2 Wed Mar 20 19:57:28 EST 2002 alpha unknown
Summary: Under some circumstances, invoking fesetenv() results
in a floating point exception being raised.
Description:
I have a piece of code which may result in underflows. I enclose
the code in between
fenv_t env;
feholdexcept(&env);
...
fesetenv(&env);
Now the code in [...] is reading floating point numbers which may
be very small and result in underflow floating point signals.
However, since we have used feholdexcept() the signals should not
be produced. And indeed they are not, until we reach fesetenv()
where the signal is raised.
If you read the manual of LIBC for fesetenv()
The fesetenv function restores the floating point environ-
ment from the object *envp. This object must be known to
be valid, e.g., the result of a call to fegetenv or
feholdexcept or equal to FE_DFL_ENV. This call does not
raise exceptions.
it says no exception should be raised.
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>From drow@nevyn.them.org Sun Nov 20 09:06:25 2005
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Date: Sun, 20 Nov 2005 12:06:21 -0500
From: Daniel Jacobowitz <drow@false.org>
To: Juan Jose Garcia Ripoll <jlr@mpq.mpg.de>, 339319-close@bugs.debian.org
Subject: Re: Bug#339319: Bug in fesetenv() [LIBC6.1]
Message-ID: <20051120170621.GA28243@nevyn.them.org>
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On Tue, Nov 15, 2005 at 02:50:37PM +0100, Juan Jose Garcia Ripoll wrote:
> Package: libc6.1
> Version: 2.2.5-11.5
> Architecture: Linux usf-cf-alpha-linux-1 2.2.20 #2 Wed Mar 20 19:57:28 EST 2002 alpha unknown
> Summary: Under some circumstances, invoking fesetenv() results
> in a floating point exception being raised.
This is a duplicate of 339318, closing - will follow up there.
--
Daniel Jacobowitz
CodeSourcery, LLC
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