Floating point trouble with x86's extended precision

[Richard Henderson]

On Wed, Aug 20, 2003 at 11:27:02PM +0200, Gabriel Dos Reis wrote:
> Somes compilers (e.g. VC++) seem to manage to get around those
> problems on x86.  GCC should be able to do something.

IIRC, VC++ just sets rounding precision to 64.  So you have
excess precision if you try to do stuff with "float" but
don't with "double".

> | 3) Set the FP reg rounding precision to 64 bits.  This has the flaw
> | that you can no longer perform XFmode operations.  This is only a
> | partial fix, in that we still have excess precision problems for
> | SFmode operations.
> 
> Agreed.  But wouldn't it be better than current situation?

No, not better, just different.  You anger a different set of folk.


r~