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[AMDGPU] Avoid use of V_READLANE into EXEC in SGPR spills

Authored by critson on Jun 19 2020, 6:23 PM.

Description

[AMDGPU] Avoid use of V_READLANE into EXEC in SGPR spills

Always prefer to clobber input SGPRs and restore them after the
spill. This applies to both spills to VGPRs and scratch.

Reviewed By: arsenm

Differential Revision: https://reviews.llvm.org/D81914

Details

Committed
critsonJun 19 2020, 8:10 PM
Reviewer
arsenm
Differential Revision
D81914: [AMDGPU] Avoid use of V_READLANE into EXEC in SGPR spills
Parents
rGb885b1b92d3d: [mlir] Fix gcc build break due to previous commit
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