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One more. Transfer kill of the larger register when lowering an EXTRACT_SUBREG.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78145 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2009-08-05 02:25:11 +00:00
parent a72dfb522d
commit b018a1e5a7
2 changed files with 60 additions and 4 deletions
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10
lib/CodeGen/LowerSubregs.cpp
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@ -56,7 +56,8 @@ namespace {
void TransferDeadFlag(MachineInstr *MI, unsigned DstReg,
const TargetRegisterInfo &TRI);
void TransferKillFlag(MachineInstr *MI, unsigned SrcReg,
const TargetRegisterInfo &TRI);
const TargetRegisterInfo &TRI,
bool AddIfNotFound = false);
};
char LowerSubregsInstructionPass::ID = 0;
@ -88,10 +89,11 @@ LowerSubregsInstructionPass::TransferDeadFlag(MachineInstr *MI,
void
LowerSubregsInstructionPass::TransferKillFlag(MachineInstr *MI,
unsigned SrcReg,
const TargetRegisterInfo &TRI) {
const TargetRegisterInfo &TRI,
bool AddIfNotFound) {
for (MachineBasicBlock::iterator MII =
prior(MachineBasicBlock::iterator(MI)); ; --MII) {
if (MII->addRegisterKilled(SrcReg, &TRI))
if (MII->addRegisterKilled(SrcReg, &TRI, AddIfNotFound))
break;
assert(MII != MI->getParent()->begin() &&
"copyRegToReg output doesn't reference source register!");
@ -142,7 +144,7 @@ bool LowerSubregsInstructionPass::LowerExtract(MachineInstr *MI) {
if (MI->getOperand(0).isDead())
TransferDeadFlag(MI, DstReg, TRI);
if (MI->getOperand(1).isKill())
TransferKillFlag(MI, SrcReg, TRI);
TransferKillFlag(MI, SuperReg, TRI, true);
#ifndef NDEBUG
MachineBasicBlock::iterator dMI = MI;