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For some targets, a copy can use a register multiple times, e.g. ppc.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@88895 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2009-11-16 05:52:06 +00:00
parent 2d947263d5
commit 285a7d57dc
2 changed files with 110 additions and 0 deletions
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lib/CodeGen/ProcessImplicitDefs.cpp
+5
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@@ -77,6 +77,7 @@ bool ProcessImplicitDefs::runOnMachineFunction(MachineFunction &fn) {
SmallVector<MachineInstr*, 8> ImpDefMIs;
MachineBasicBlock *Entry = fn.begin();
SmallPtrSet<MachineBasicBlock*,16> Visited;
SmallPtrSet<MachineInstr*, 8> ModInsts;
for (df_ext_iterator<MachineBasicBlock*, SmallPtrSet<MachineBasicBlock*,16> >
DFI = df_ext_begin(Entry, Visited), E = df_ext_end(Entry, Visited);
@@ -201,6 +202,8 @@ bool ProcessImplicitDefs::runOnMachineFunction(MachineFunction &fn) {
MachineOperand &RMO = UI.getOperand();
MachineInstr *RMI = &*UI;
++UI;
if (ModInsts.count(RMI))
continue;
MachineBasicBlock *RMBB = RMI->getParent();
if (RMBB == MBB)
continue;
@@ -216,6 +219,7 @@ bool ProcessImplicitDefs::runOnMachineFunction(MachineFunction &fn) {
RMI->setDesc(tii_->get(TargetInstrInfo::IMPLICIT_DEF));
for (int j = RMI->getNumOperands() - 1, ee = 0; j > ee; --j)
RMI->RemoveOperand(j);
ModInsts.insert(RMI);
continue;
}
@@ -226,6 +230,7 @@ bool ProcessImplicitDefs::runOnMachineFunction(MachineFunction &fn) {
RMO.setIsKill();
}
}
ModInsts.clear();
ImpDefRegs.clear();
ImpDefMIs.clear();
}