[Bug target/25661] Wrong long double to float conversion

[joseph at codesourcery dot com]

------- Comment #2 from joseph at codesourcery dot com  2006-01-04 16:47 -------
Subject: Re:  Wrong long double to float conversion

On Wed, 4 Jan 2006, pinskia at gcc dot gnu dot org wrote:

> Hmm, actually there is no rounding from TF to DF except for the fact that upper
> potion of the TF mode is taken only.
> 
> I am thinking this testcase is invalid for 128bit IBM long double format.
> 
> IBM 128bit long double format is not IEEE 128bit format at all.

C99 Annex F allows non-IEC 60559 formats for long double and it seems 
conversions from such types to float must follow the IEC 60559 rules.  Do 
you have a pointer to a specification for double+double long double which 
does something other than compute to infinite precision then round to 
nearest representable value according to current rounding mode?


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25661