On 2002.04.12 14:43 Jos� Fonseca wrote:
> On 2002.04.10 19:40 Jos� Fonseca wrote:
>>
>> ... since the specs give some tolerance it would be nice to run the
>> conformance tests with different settings in mmx_blend.S, specially the
>> "single multiply w/o rouding" ...
>
> I've started to play with glean and I tried to check this myself, but it
> seems there is no effect in the results no matter what changes I make in
> mmx_blend.S. ...
>
I've come to the conclusion that glean requirements lowered quite a deal!
It even passes making
s = (p*a + q*(255 - a)) >> 8
without a warning, thought it recognizes the less accuracy when comparing
with the default implementation.
The only way I managed to make it fail was setting a &= 0xf0, to reduce
heavily the precision of results!!
It seems that there is a bug on glean. I'm using latest CVS.
I'll try to run the glperf tests now and see if I can get to the bottom of
this issue.
Jos� Fonseca
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