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Preserve subregs on PHI source operands. Patch by Krister Wombell!

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111366 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2010-08-18 16:09:47 +00:00
parent ca9460f5a0
commit 9ac248848f
1 changed files with 4 additions and 1 deletions
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5
lib/CodeGen/PHIElimination.cpp
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@@ -181,6 +181,7 @@ void llvm::PHIElimination::LowerAtomicPHINode(
unsigned NumSrcs = (MPhi->getNumOperands() - 1) / 2; unsigned NumSrcs = (MPhi->getNumOperands() - 1) / 2;
unsigned DestReg = MPhi->getOperand(0).getReg(); unsigned DestReg = MPhi->getOperand(0).getReg();
assert(MPhi->getOperand(0).getSubReg() == 0 && "Can't handle sub-reg PHIs");
bool isDead = MPhi->getOperand(0).isDead(); bool isDead = MPhi->getOperand(0).isDead();
// Create a new register for the incoming PHI arguments. // Create a new register for the incoming PHI arguments.
@@ -267,6 +268,8 @@ void llvm::PHIElimination::LowerAtomicPHINode(
SmallPtrSet<MachineBasicBlock*, 8> MBBsInsertedInto; SmallPtrSet<MachineBasicBlock*, 8> MBBsInsertedInto;
for (int i = NumSrcs - 1; i >= 0; --i) { for (int i = NumSrcs - 1; i >= 0; --i) {
unsigned SrcReg = MPhi->getOperand(i*2+1).getReg(); unsigned SrcReg = MPhi->getOperand(i*2+1).getReg();
unsigned SrcSubReg = MPhi->getOperand(i*2+1).getSubReg();
assert(TargetRegisterInfo::isVirtualRegister(SrcReg) && assert(TargetRegisterInfo::isVirtualRegister(SrcReg) &&
"Machine PHI Operands must all be virtual registers!"); "Machine PHI Operands must all be virtual registers!");
@@ -296,7 +299,7 @@ void llvm::PHIElimination::LowerAtomicPHINode(
// Insert the copy. // Insert the copy.
if (!reusedIncoming && IncomingReg) if (!reusedIncoming && IncomingReg)
BuildMI(opBlock, InsertPos, MPhi->getDebugLoc(), BuildMI(opBlock, InsertPos, MPhi->getDebugLoc(),
TII->get(TargetOpcode::COPY), IncomingReg).addReg(SrcReg); TII->get(TargetOpcode::COPY), IncomingReg).addReg(SrcReg, 0, SrcSubReg);
// Now update live variable information if we have it. Otherwise we're done // Now update live variable information if we have it. Otherwise we're done
if (!LV) continue; if (!LV) continue;