Don't try to sink 3-address instruction if convertToThreeAddress created more than one instructions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48336 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/TwoAddressInstructionPass.cpp b/lib/CodeGen/TwoAddressInstructionPass.cpp
index 7380327..30727a6 100644
--- a/lib/CodeGen/TwoAddressInstructionPass.cpp
+++ b/lib/CodeGen/TwoAddressInstructionPass.cpp
@@ -291,7 +291,12 @@
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;