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Author SHA1 Message Date
Matt Arsenault 08906a3c62 AMDGPU: Fix using incorrect private resource with no allocation 
It's possible to have a use of the private resource descriptor or
scratch wave offset registers even though there are no allocated
stack objects. This would result in continuing to use the maximum
number reserved registers. This could go over the number of SGPRs
available on VI, or violate the SGPR limit requested by
the function attributes.

llvm-svn: 285435
 2016-10-28 19:43:31 +00:00
Matt Arsenault 253640e18d AMDGPU: Assume spilling will occur at -O0 
Because everything live is spilled at the end of a
block by fast regalloc, assume this will happen and
avoid the copies of the resource descriptor.

llvm-svn: 284119
 2016-10-13 13:10:00 +00:00