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Don't try to sink 3-address instruction if convertToThreeAddress created more than one instructions.

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llvm-svn: 48336
This commit is contained in:
Evan Cheng 2008-03-13 07:56:58 +00:00
parent a76bb6e64e
commit 9a7395ba78
1 changed files with 6 additions and 1 deletions
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7
lib/CodeGen/TwoAddressInstructionPass.cpp
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@ -291,7 +291,12 @@ bool TwoAddressInstructionPass::runOnMachineFunction(MachineFunction &MF) {
if (MachineInstr *New=TII->convertToThreeAddress(mbbi, mi, *LV)) {
DOUT << "2addr: CONVERTING 2-ADDR: " << *mi;
DOUT << "2addr: TO 3-ADDR: " << *New;
bool Sunk = Sink3AddrInstruction(mbbi, New, regB, mi);
bool Sunk = false;
if (New->findRegisterUseOperand(regB, New, TRI))
// FIXME: Temporary workaround. If the new instruction doesn't
// uses regB, convertToThreeAddress must have created more
// then one instruction.
Sunk = Sink3AddrInstruction(mbbi, New, regB, mi);
mbbi->erase(mi); // Nuke the old inst.
if (!Sunk) mi = New;
++NumConvertedTo3Addr;