Revert r68073. It's causing a failure in the Apple-style builds.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68092 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/VirtRegMap.cpp b/lib/CodeGen/VirtRegMap.cpp
index cb0f764..c5bfcfd 100644
--- a/lib/CodeGen/VirtRegMap.cpp
+++ b/lib/CodeGen/VirtRegMap.cpp
@@ -188,7 +188,7 @@
if (MF->getFrameInfo()->isFixedObjectIndex(FI))
continue;
// This stack reference was produced by instruction selection and
- // is not a spill
+ // is not a spill.
if (FI < LowSpillSlot)
continue;
assert((unsigned)FI-LowSpillSlot < SpillSlotToUsesMap.size()
@@ -201,6 +201,27 @@
EmergencySpillMap.erase(MI);
}
+bool VirtRegMap::OnlyUseOfStackSlot(const MachineInstr *MI) const {
+ for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
+ const MachineOperand &MO = MI->getOperand(i);
+ if (!MO.isFI())
+ continue;
+ int FI = MO.getIndex();
+ if (MF->getFrameInfo()->isFixedObjectIndex(FI))
+ continue;
+ // This stack reference was produced by instruction selection and
+ // is not a spill.
+ if (FI < LowSpillSlot)
+ continue;
+ assert((unsigned)FI-LowSpillSlot < SpillSlotToUsesMap.size()
+ && "Invalid spill slot");
+ if (SpillSlotToUsesMap[FI - LowSpillSlot].size() != 1)
+ return false;
+ }
+
+ return true;
+}
+
void VirtRegMap::print(std::ostream &OS, const Module* M) const {
const TargetRegisterInfo* TRI = MF->getTarget().getRegisterInfo();