comiss vs. ucomiss

Tom Rodriguez Thomas.Rodriguez at Sun.COM
Tue Oct 14 11:03:47 PDT 2008

I was just making some comparisons between and and  
noticed that uses comiss/comisd for floating point compares  
with SSE but uses ucomiss/ucomisd.  The only difference  
between them is that the ucom versions don't signal for quiet NaNs.   
We have fp exception suppressed so functionally it doesn't make any  
difference.  It does seem like they should be doing the same thing  
though.  Anyone know why they emit different things?


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