Lowering of atomic instructions can result in operands being
used more than once. If ISel had put a kill flag on one of them,
it's not valid to transfer the kill flag to each new instance.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103799 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index ea4da9d..8821bef 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -7988,9 +7988,15 @@
MachineOperand& dest1Oper = bInstr->getOperand(0);
MachineOperand& dest2Oper = bInstr->getOperand(1);
MachineOperand* argOpers[2 + X86AddrNumOperands];
- for (int i=0; i < 2 + X86AddrNumOperands; ++i)
+ for (int i=0; i < 2 + X86AddrNumOperands; ++i) {
argOpers[i] = &bInstr->getOperand(i+2);
+ // We use some of the operands multiple times, so conservatively just
+ // clear any kill flags that might be present.
+ if (argOpers[i]->isReg() && argOpers[i]->isUse())
+ argOpers[i]->setIsKill(false);
+ }
+
// x86 address has 5 operands: base, index, scale, displacement, and segment.
int lastAddrIndx = X86AddrNumOperands - 1; // [0,3]