[PATCH] Fix rounding bug in emulation for double floatoperating

[Kumar Gala]

>> When I run this on a G5 (w/HW FP) I get:
>>
>> dmul 3fe0000000000000 * 1 = 0 expected 0 (PASS)
>> dmul bfe0000000000000 * 1 = 8000000000000000 expected 0 (PASS)
>> dmul 8000000000000001 * bfe0000000000000 = 0 expected 0 (PASS)
>>
>> ddiv 1 / 4000000000000000 = 0 expected 0 (PASS)
>>
>> and on the 85xx w/FP emu:
>>
>> dmul 3fe0000000000000 * 1 = 0 expected 0 (PASS)
>> dmul bfe0000000000000 * 1 = 8000000000000000 expected 0 (PASS)
>> dmul 8000000000000001 * bfe0000000000000 = 0 expected 0 (PASS)
>>
>> ddiv 1 / 4000000000000000 = 0 expected 0 (PASS)
>>
>> Maybe I'm missing where the error is.
> I am missing ...
> It is supposed to run based on previous IEEE 754 patch.
> http://ozlabs.org/pipermail/linuxppc-dev/2007-February/031351.html

I'd really like to see to see a testcase show the issue with "classic  
FP emu" on a 85xx system.

(seems like it should be pretty straight forward).

- k