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Author SHA1 Message Date
Stanislav Mekhanoshin 61e7a61bdc [AMDGPU] Allow folding of sgpr to vgpr copy 
Potentially sgpr to sgpr copy should also be possible.
That is however trickier because we may end up with a
wrong register class at use because of xm0/xexec permutations.

Differential Revision: https://reviews.llvm.org/D69280
 2019-10-23 18:42:48 -07:00
Stanislav Mekhanoshin f9b1dc5553 [AMDGPU] Updated fold-vgpr-copy.mir test. NFC. 2019-10-22 12:43:23 -07:00
Stanislav Mekhanoshin 48f57138be [AMDGPU] Allow tied operand subreg folding 
Turns out it makes sense, contrarily to what comment said.

Differential Revision: https://reviews.llvm.org/D69287
 2019-10-22 11:27:36 -07:00
Stanislav Mekhanoshin b080adfc0c [AMDGPU] Fold copy (copy vgpr) 
This allows to reduce a number of used VGPRs in some cases.

Differential Revision: https://reviews.llvm.org/D52577

llvm-svn: 343249
 2018-09-27 18:55:20 +00:00