Comment # 3 on bug 84977 from Tom Stellard

(In reply to David Heidelberger (okias) from comment #1)
> Created attachment 107809 [details]
> r300_regalloc.txt
> 
> Also, problematic swizzle can be seen on instruction 27: in diff wx -> wz.

.wz is a legal swizzle according to the native_swizzles table.  Can you add
printfs to lookup_native_swizzle to see why it is not being treated as a legal
swizzle?