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R600/SI: Don't copy flags when extracting subreg 

This was resulting in use of a register after a kill.
For some reason this showed up as a problem in many tests
when moving the SIFixSGPRCopies pass closer to instruction
selection.

llvm-svn: 222175
This commit is contained in:
Matt Arsenault 2014-11-17 21:11:37 +00:00
parent 6f679785f4
commit 7480a0e163
1 changed files with 8 additions and 6 deletions
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14
llvm/lib/Target/R600/SIInstrInfo.cpp
View File

@ -1281,13 +1281,15 @@ unsigned SIInstrInfo::buildExtractSubReg(MachineBasicBlock::iterator MI,
// value so we don't need to worry about merging its subreg index with the
// SubIdx passed to this function. The register coalescer should be able to
// eliminate this extra copy.
BuildMI(*MI->getParent(), MI, MI->getDebugLoc(), get(TargetOpcode::COPY),
NewSuperReg)
.addOperand(SuperReg);
MachineBasicBlock *MBB = MI->getParent();
DebugLoc DL = MI->getDebugLoc();
BuildMI(*MBB, MI, DL, get(TargetOpcode::COPY), NewSuperReg)
.addReg(SuperReg.getReg(), 0, SuperReg.getSubReg());
BuildMI(*MBB, MI, DL, get(TargetOpcode::COPY), SubReg)
.addReg(NewSuperReg, 0, SubIdx);
BuildMI(*MI->getParent(), MI, MI->getDebugLoc(), get(TargetOpcode::COPY),
SubReg)
.addReg(NewSuperReg, 0, SubIdx);
return SubReg;
}