PPC: [turbofan] Make MachineType a pair of enums.

Port bb2a830d
Port 56673804

Original commit messages:
    MachineType is now a class with two enum fields:
    - MachineRepresentation
    - MachineSemantic

    Both enums are usable on their own, and this change switches some places
    from using MachineType to use just MachineRepresentation. Most notably:
    - register allocator now uses just the representation.
    - Phi and Select nodes only refer to representations.

   Store nodes use only MachineRepresentation, not MachineType.

R=jarin@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1523373003

Cr-Commit-Position: refs/heads/master@{#32916}

src/compiler/ppc/instruction-selector-ppc.cc

@@ -142,32 +142,30 @@ void VisitBinop(InstructionSelector* selector, Node* node, ArchOpcode opcode,
 
 
 void InstructionSelector::VisitLoad(Node* node) {
-  MachineType rep = RepresentationOf(OpParameter<LoadRepresentation>(node));
-  MachineType typ = TypeOf(OpParameter<LoadRepresentation>(node));
+  LoadRepresentation load_rep = LoadRepresentationOf(node->op());
   PPCOperandGenerator g(this);
   Node* base = node->InputAt(0);
   Node* offset = node->InputAt(1);
-
   ArchOpcode opcode;
   ImmediateMode mode = kInt16Imm;
-  switch (rep) {
-    case kRepFloat32:
+  switch (load_rep.representation()) {
+    case MachineRepresentation::kFloat32:
       opcode = kPPC_LoadFloat32;
       break;
-    case kRepFloat64:
+    case MachineRepresentation::kFloat64:
       opcode = kPPC_LoadDouble;
       break;
-    case kRepBit:  // Fall through.
-    case kRepWord8:
-      opcode = (typ == kTypeInt32) ? kPPC_LoadWordS8 : kPPC_LoadWordU8;
+    case MachineRepresentation::kBit:  // Fall through.
+    case MachineRepresentation::kWord8:
+      opcode = load_rep.IsSigned() ? kPPC_LoadWordS8 : kPPC_LoadWordU8;
       break;
-    case kRepWord16:
-      opcode = (typ == kTypeInt32) ? kPPC_LoadWordS16 : kPPC_LoadWordU16;
+    case MachineRepresentation::kWord16:
+      opcode = load_rep.IsSigned() ? kPPC_LoadWordS16 : kPPC_LoadWordU16;
       break;
 #if !V8_TARGET_ARCH_PPC64
-    case kRepTagged:  // Fall through.
+    case MachineRepresentation::kTagged:  // Fall through.
 #endif
-    case kRepWord32:
+    case MachineRepresentation::kWord32:
       opcode = kPPC_LoadWordS32;
 #if V8_TARGET_ARCH_PPC64
       // TODO(mbrandy): this applies to signed loads only (lwa)
@@ -175,8 +173,8 @@ void InstructionSelector::VisitLoad(Node* node) {
 #endif
       break;
 #if V8_TARGET_ARCH_PPC64
-    case kRepTagged:  // Fall through.
-    case kRepWord64:
+    case MachineRepresentation::kTagged:  // Fall through.
+    case MachineRepresentation::kWord64:
       opcode = kPPC_LoadWord64;
       mode = kInt16Imm_4ByteAligned;
       break;
@@ -204,13 +202,13 @@ void InstructionSelector::VisitStore(Node* node) {
   Node* offset = node->InputAt(1);
   Node* value = node->InputAt(2);
 
-  StoreRepresentation store_rep = OpParameter<StoreRepresentation>(node);
+  StoreRepresentation store_rep = StoreRepresentationOf(node->op());
   WriteBarrierKind write_barrier_kind = store_rep.write_barrier_kind();
-  MachineType rep = RepresentationOf(store_rep.machine_type());
+  MachineRepresentation rep = store_rep.representation();
 
   // TODO(ppc): I guess this could be done in a better way.
   if (write_barrier_kind != kNoWriteBarrier) {
-    DCHECK_EQ(kRepTagged, rep);
+    DCHECK_EQ(MachineRepresentation::kTagged, rep);
     InstructionOperand inputs[3];
     size_t input_count = 0;
     inputs[input_count++] = g.UseUniqueRegister(base);
@@ -242,28 +240,28 @@ void InstructionSelector::VisitStore(Node* node) {
     ArchOpcode opcode;
     ImmediateMode mode = kInt16Imm;
     switch (rep) {
-      case kRepFloat32:
+      case MachineRepresentation::kFloat32:
         opcode = kPPC_StoreFloat32;
         break;
-      case kRepFloat64:
+      case MachineRepresentation::kFloat64:
         opcode = kPPC_StoreDouble;
         break;
-      case kRepBit:  // Fall through.
-      case kRepWord8:
+      case MachineRepresentation::kBit:  // Fall through.
+      case MachineRepresentation::kWord8:
         opcode = kPPC_StoreWord8;
         break;
-      case kRepWord16:
+      case MachineRepresentation::kWord16:
         opcode = kPPC_StoreWord16;
         break;
 #if !V8_TARGET_ARCH_PPC64
-      case kRepTagged:  // Fall through.
+      case MachineRepresentation::kTagged:  // Fall through.
 #endif
-      case kRepWord32:
+      case MachineRepresentation::kWord32:
         opcode = kPPC_StoreWord32;
         break;
 #if V8_TARGET_ARCH_PPC64
-      case kRepTagged:  // Fall through.
-      case kRepWord64:
+      case MachineRepresentation::kTagged:  // Fall through.
+      case MachineRepresentation::kWord64:
         opcode = kPPC_StoreWord64;
         mode = kInt16Imm_4ByteAligned;
         break;
@@ -287,30 +285,29 @@ void InstructionSelector::VisitStore(Node* node) {
 
 
 void InstructionSelector::VisitCheckedLoad(Node* node) {
-  MachineType rep = RepresentationOf(OpParameter<MachineType>(node));
-  MachineType typ = TypeOf(OpParameter<MachineType>(node));
+  CheckedLoadRepresentation load_rep = CheckedLoadRepresentationOf(node->op());
   PPCOperandGenerator g(this);
   Node* const base = node->InputAt(0);
   Node* const offset = node->InputAt(1);
   Node* const length = node->InputAt(2);
   ArchOpcode opcode;
-  switch (rep) {
-    case kRepWord8:
-      opcode = typ == kTypeInt32 ? kCheckedLoadInt8 : kCheckedLoadUint8;
+  switch (load_rep.representation()) {
+    case MachineRepresentation::kWord8:
+      opcode = load_rep.IsSigned() ? kCheckedLoadInt8 : kCheckedLoadUint8;
       break;
-    case kRepWord16:
-      opcode = typ == kTypeInt32 ? kCheckedLoadInt16 : kCheckedLoadUint16;
+    case MachineRepresentation::kWord16:
+      opcode = load_rep.IsSigned() ? kCheckedLoadInt16 : kCheckedLoadUint16;
       break;
-    case kRepWord32:
+    case MachineRepresentation::kWord32:
       opcode = kCheckedLoadWord32;
       break;
-    case kRepWord64:
+    case MachineRepresentation::kWord64:
       opcode = kCheckedLoadWord64;
       break;
-    case kRepFloat32:
+    case MachineRepresentation::kFloat32:
       opcode = kCheckedLoadFloat32;
       break;
-    case kRepFloat64:
+    case MachineRepresentation::kFloat64:
       opcode = kCheckedLoadFloat64;
       break;
     default:
@@ -325,7 +322,7 @@ void InstructionSelector::VisitCheckedLoad(Node* node) {
 
 
 void InstructionSelector::VisitCheckedStore(Node* node) {
-  MachineType rep = RepresentationOf(OpParameter<MachineType>(node));
+  MachineRepresentation rep = CheckedStoreRepresentationOf(node->op());
   PPCOperandGenerator g(this);
   Node* const base = node->InputAt(0);
   Node* const offset = node->InputAt(1);
@@ -333,22 +330,22 @@ void InstructionSelector::VisitCheckedStore(Node* node) {
   Node* const value = node->InputAt(3);
   ArchOpcode opcode;
   switch (rep) {
-    case kRepWord8:
+    case MachineRepresentation::kWord8:
       opcode = kCheckedStoreWord8;
       break;
-    case kRepWord16:
+    case MachineRepresentation::kWord16:
       opcode = kCheckedStoreWord16;
       break;
-    case kRepWord32:
+    case MachineRepresentation::kWord32:
       opcode = kCheckedStoreWord32;
       break;
-    case kRepWord64:
+    case MachineRepresentation::kWord64:
       opcode = kCheckedStoreWord64;
       break;
-    case kRepFloat32:
+    case MachineRepresentation::kFloat32:
       opcode = kCheckedStoreFloat32;
       break;
-    case kRepFloat64:
+    case MachineRepresentation::kFloat64:
       opcode = kCheckedStoreFloat64;
       break;
     default: