[PATCH] R600/SI: Set isAllocatable = 0 on special register classes.
Matthew.Arsenault at amd.com
Wed Oct 8 17:02:37 PDT 2014
I'm not sure if this fixes any real problems.
copyPhysReg already has a comment that SCC should never be copied,
so set CopyCost = -1.
These all seem obviously not allocatable, but I'm not sure about VCC
since most instructions that use it can also use an arbitrary SGPR
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