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- Remove calls to copyKillDeadInfo which is an N^2 function. Instead, propagate kill / dead markers as new instructions are constructed in foldMemoryOperand, convertToThressAddress, etc.

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- Also remove LiveVariables::instructionChanged, etc. Replace all calls with cheaper calls which update VarInfo kill list.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53097 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2008-07-03 09:09:37 +00:00
parent f9d0318950
commit 9f1c8317a4
16 changed files with 225 additions and 260 deletions
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30
lib/CodeGen/MachineInstr.cpp
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@@ -647,9 +647,9 @@ void MachineInstr::copyPredicates(const MachineInstr *MI) {
}
}
/// isSafeToMove - Return true if it is safe to this instruction. If SawStore is
/// set to true, it means that there is a store (or call) between the
/// instruction's location and its intended destination.
/// isSafeToMove - Return true if it is safe to move this instruction. If
/// SawStore is set to true, it means that there is a store (or call) between
/// the instruction's location and its intended destination.
bool MachineInstr::isSafeToMove(const TargetInstrInfo *TII, bool &SawStore) {
// Ignore stuff that we obviously can't move.
if (TID->mayStore() || TID->isCall()) {
@@ -829,27 +829,3 @@ bool MachineInstr::addRegisterDead(unsigned IncomingReg,
}
return false;
}
/// copyKillDeadInfo - copies killed/dead information from one instr to another
void MachineInstr::copyKillDeadInfo(MachineInstr *OldMI,
const TargetRegisterInfo *RegInfo) {
// If the instruction defines any virtual registers, update the VarInfo,
// kill and dead information for the instruction.
for (unsigned i = 0, e = OldMI->getNumOperands(); i != e; ++i) {
MachineOperand &MO = OldMI->getOperand(i);
if (MO.isRegister() && MO.getReg() &&
TargetRegisterInfo::isVirtualRegister(MO.getReg())) {
unsigned Reg = MO.getReg();
if (MO.isDef()) {
if (MO.isDead()) {
MO.setIsDead(false);
addRegisterDead(Reg, RegInfo);
}
}
if (MO.isKill()) {
MO.setIsKill(false);
addRegisterKilled(Reg, RegInfo);
}
}
}
}