Problem with interpreted double operations on IA64

Tue Apr 9 09:43:00 GMT 2002

It's attached, but probably not very informative; __java_double is
understood by the front end. But it's a bit hard for me to follow what it
does with it, or why it exists as a type distinct from double.
Hans
> -----Original Message-----
> From: Andrew Haley [mailto:aph@cambridge.redhat.com]
> Sent: Tuesday, April 09, 2002 9:37 AM
> To: Boehm, Hans
> Cc: 'java@gcc.gnu.org'; 'tromey@redhat.com'
> Subject: Problem with interpreted double operations on IA64
>>> Boehm, Hans writes:
> > Could someone point me at a description of exactly how 
> type __java_double
> > should differ from double? As far as I can tell, 
> __java_double is used
> > primarily by the interpreter? On X86 this seems to work 
> correctly. On IA64
> > (and perhaps other 64-bit platforms?), it seems to get 
> confused about the
> > low order bits. This means that "double precision" results in the
> > interpreter are computed at most to single precision 
> accuracy. Here's a C++
> > example to demonstrate the issue. Gij runs into the same 
> problems, causing
> > scimark to fail, etc. (This is with a very recent 3.1 tree.)
>> Weird. Could you please run gcc with '-save-temps -dD' and let us
> have the double.ii file you get?
>> Andrew.
>
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