Move DenseMapInfo for MachineInstr* to MachineInstr.h

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97667 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 62 insertions, 0 deletions

diff --git a/include/llvm/CodeGen/MachineInstr.h b/include/llvm/CodeGen/MachineInstr.h
index 66be26c950..0a9ad11399 100644
--- a/include/llvm/CodeGen/MachineInstr.h
+++ b/include/llvm/CodeGen/MachineInstr.h
@@ -419,6 +419,68 @@ private:
   void AddRegOperandsToUseLists(MachineRegisterInfo &RegInfo);
 };
 
+/// DenseMapInfo for MachineInstr*.
+template<> struct DenseMapInfo<MachineInstr*> {
+  static inline MachineInstr *getEmptyKey() {
+    return 0;
+  }
+
+  static inline MachineInstr *getTombstoneKey() {
+    return reinterpret_cast<MachineInstr*>(-1);
+  }
+
+  static unsigned getHashValue(const MachineInstr* const &MI) {
+    unsigned Hash = MI->getOpcode() * 37;
+    for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
+      const MachineOperand &MO = MI->getOperand(i);
+      uint64_t Key = (uint64_t)MO.getType() << 32;
+      switch (MO.getType()) {
+        default: break;
+        case MachineOperand::MO_Register:
+          if (MO.isDef())
+            continue;  // Skip defs.
+          Key |= MO.getReg();
+          break;
+        case MachineOperand::MO_Immediate:
+          Key |= MO.getImm();
+          break;
+        case MachineOperand::MO_FrameIndex:
+        case MachineOperand::MO_ConstantPoolIndex:
+        case MachineOperand::MO_JumpTableIndex:
+          Key |= MO.getIndex();
+          break;
+        case MachineOperand::MO_MachineBasicBlock:
+          Key |= DenseMapInfo<void*>::getHashValue(MO.getMBB());
+          break;
+        case MachineOperand::MO_GlobalAddress:
+          Key |= DenseMapInfo<void*>::getHashValue(MO.getGlobal());
+          break;
+        case MachineOperand::MO_BlockAddress:
+          Key |= DenseMapInfo<void*>::getHashValue(MO.getBlockAddress());
+          break;
+      }
+      Key += ~(Key << 32);
+      Key ^= (Key >> 22);
+      Key += ~(Key << 13);
+      Key ^= (Key >> 8);
+      Key += (Key << 3);
+      Key ^= (Key >> 15);
+      Key += ~(Key << 27);
+      Key ^= (Key >> 31);
+      Hash = (unsigned)Key + Hash * 37;
+    }
+    return Hash;
+  }
+
+  static bool isEqual(const MachineInstr* const &LHS,
+                      const MachineInstr* const &RHS) {
+    if (RHS == getEmptyKey() || RHS == getTombstoneKey() ||
+        LHS == getEmptyKey() || LHS == getTombstoneKey())
+      return LHS == RHS;
+    return LHS->isIdenticalTo(RHS, MachineInstr::IgnoreVRegDefs);
+  }
+};
+
 //===----------------------------------------------------------------------===//
 // Debugging Support