[Packetizer] Add function to check for aliasing between instructions
llvm-svn: 316243
diff --git a/llvm/lib/CodeGen/DFAPacketizer.cpp b/llvm/lib/CodeGen/DFAPacketizer.cpp
index 853b9af..cf21316 100644
--- a/llvm/lib/CodeGen/DFAPacketizer.cpp
+++ b/llvm/lib/CodeGen/DFAPacketizer.cpp
@@ -336,6 +336,38 @@
VLIWScheduler->finishBlock();
}
+bool VLIWPacketizerList::alias(const MachineMemOperand &Op1,
+ const MachineMemOperand &Op2,
+ bool UseTBAA) const {
+ if (!Op1.getValue() || !Op2.getValue())
+ return true;
+
+ int64_t MinOffset = std::min(Op1.getOffset(), Op2.getOffset());
+ int64_t Overlapa = Op1.getSize() + Op1.getOffset() - MinOffset;
+ int64_t Overlapb = Op2.getSize() + Op2.getOffset() - MinOffset;
+
+ AliasResult AAResult =
+ AA->alias(MemoryLocation(Op1.getValue(), Overlapa,
+ UseTBAA ? Op1.getAAInfo() : AAMDNodes()),
+ MemoryLocation(Op2.getValue(), Overlapb,
+ UseTBAA ? Op2.getAAInfo() : AAMDNodes()));
+
+ return AAResult != NoAlias;
+}
+
+bool VLIWPacketizerList::alias(const MachineInstr &MI1,
+ const MachineInstr &MI2,
+ bool UseTBAA) const {
+ if (MI1.memoperands_empty() || MI2.memoperands_empty())
+ return true;
+
+ for (const MachineMemOperand *Op1 : MI1.memoperands())
+ for (const MachineMemOperand *Op2 : MI2.memoperands())
+ if (alias(*Op1, *Op2, UseTBAA))
+ return true;
+ return false;
+}
+
// Add a DAG mutation object to the ordered list.
void VLIWPacketizerList::addMutation(
std::unique_ptr<ScheduleDAGMutation> Mutation) {