Commit 14cffe0b authored Jun 04, 2016 by Tom Stellard

Merging r268287:

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r268287 | thomas.stellard | 2016-05-02 12:37:56 -0700 (Mon, 02 May 2016) | 19 lines

AMDGPU/SI: Set the kill flag on temp VGPRs used to restore SGPRs from scratch

Summary:
When we restore an SGPR value from scratch, we first load it into a
temporary VGPR and then use v_readlane_b32 to copy the value from the
VGPR back into an SGPR.

We weren't setting the kill flag on the VGPR in the v_readlane_b32
instruction, so the register scavenger wasn't able to re-use this
temp value later.

I wasn't able to create a lit test for this.

Reviewers: arsenm

Subscribers: arsenm, llvm-commits

Differential Revision: http://reviews.llvm.org/D19744

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llvm-svn: 271770

parent 8310438f

llvm/lib/Target/AMDGPU/SIRegisterInfo.cpp

+1 −1

Original line number	Diff line number	Diff line
		@@ -411,7 +411,7 @@ void SIRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator MI,
		.addMemOperand(MMO);
		BuildMI(*MBB, MI, DL,
		TII->getMCOpcodeFromPseudo(AMDGPU::V_READLANE_B32), SubReg)
		.addReg(TmpReg)
		.addReg(TmpReg, RegState::Kill)
		.addImm(0)
		.addReg(MI->getOperand(0).getReg(), RegState::ImplicitDefine);
		}