Problem with interpreted double operations on IA64

[Boehm, Hans]

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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