SSE4 instruction set

[Mathieu Monnier]

Hi,

Attached is the promised source code. It confirms the pmulhrsw behavior, 
it shows that abs(-128) = -128, and it shows that pmaddubsw is quite 
more tricky than one would have think : it does a ( unsigned char x 
signed char) multiplication, and then a signed word saturated addition. 
So pmaddubsw mm0, mm1 != pmaddubsw mm1, mm0 ( that's the price to pay 
for a much more useful instruction ).

Regards,

Mathieu


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