>>>>> Newer clangs support the "K" constraint? Fixed in response to its use
>>>>> in pixman? :)
> 
> And to close the loop on this, the fix has landed in clang trunk and will be 
> in 3.1:
> http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20120319/055254.html


And the other half of the issue seems to be a bug in pixman (at least that's 
what I am told):

"""
> FWIW the problem happening here with inlining is that at -O0 the constant 
> isn't being propagated through the inlining and so we have the 'K' constant 
> error that you see.

IMO, the source of this problem is that pixman isn't using clang's 
xmmintrin.h, which defines _mm_shuffle_pi16 for exactly this reason.  They 
should fix that.
"""

--Jeremy



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