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Re: M4 1.4.9b testsuite failure

From: Andreas Schwab
Subject: Re: M4 1.4.9b testsuite failure
Date: Wed, 30 May 2007 16:24:37 +0200
User-agent: Gnus/5.110006 (No Gnus v0.6) Emacs/22.0.97 (gnu/linux)

Eric Blake <address@hidden> writes:

> Bruno Haible wrote the isnanl replacement.  Care to enlighten us how the
> ia64 long double is laid out in memory?  I'm looking at google results,
> such as http://gcc.gnu.org/ml/gcc-patches/2000-08/msg00589.html as starters.

The problem is that the test is bogus.  The position of one of the
exponent bits does not say anything about the position of the SNAN bit.
For example, the Motorola double extended format has 16 bits of padding
between the exponent and the mantissa.  Even with out padding there is
no requirement that the SNAN bit is adjacent to the exponent.


Andreas Schwab, SuSE Labs, address@hidden
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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