PPC: [wasm] Int64Lowering of Int64Sub.

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

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/base/adapters.h"
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
 #include "src/ppc/frames-ppc.h"
 
@@ skipping 767 matching lines @@
     } else if (mleft.right().Is(24) && m.right().Is(24)) {
       Emit(kPPC_ExtendSignWord8, g.DefineAsRegister(node),
            g.UseRegister(mleft.left().node()));
       return;
     }
   }
   VisitRRO(this, kPPC_ShiftRightAlg32, node, kShift32Imm);
 }
 
 #if !V8_TARGET_ARCH_PPC64
-void InstructionSelector::VisitInt32PairAdd(Node* node) {
-  PPCOperandGenerator g(this);
+void VisitPairBinop(InstructionSelector* selector, ArchOpcode opcode,
+                    Node* node) {
+  PPCOperandGenerator g(selector);
 
   // We use UseUniqueRegister here to avoid register sharing with the output
   // registers.
   InstructionOperand inputs[] = {
       g.UseRegister(node->InputAt(0)), g.UseUniqueRegister(node->InputAt(1)),
       g.UseRegister(node->InputAt(2)), g.UseUniqueRegister(node->InputAt(3))};
 
   InstructionOperand outputs[] = {
       g.DefineAsRegister(node),
       g.DefineAsRegister(NodeProperties::FindProjection(node, 1))};
 
-  Emit(kPPC_AddPair, 2, outputs, 4, inputs);
+  selector->Emit(opcode, 2, outputs, 4, inputs);
 }
 
-void InstructionSelector::VisitInt32PairSub(Node* node) { UNIMPLEMENTED(); }
+void InstructionSelector::VisitInt32PairAdd(Node* node) {
+  VisitPairBinop(this, kPPC_AddPair, node);
+}
+
+void InstructionSelector::VisitInt32PairSub(Node* node) {
+  VisitPairBinop(this, kPPC_SubPair, node);
+}
 
 void VisitPairShift(InstructionSelector* selector, ArchOpcode opcode,
                     Node* node) {
   PPCOperandGenerator g(selector);
   Int32Matcher m(node->InputAt(2));
   InstructionOperand shift_operand;
   if (m.HasValue()) {
     shift_operand = g.UseImmediate(m.node());
   } else {
     shift_operand = g.UseUniqueRegister(m.node());
@@ skipping 1068 matching lines @@
          MachineOperatorBuilder::kFloat64RoundTruncate |
          MachineOperatorBuilder::kFloat64RoundTiesAway |
          MachineOperatorBuilder::kWord32Popcnt |
          MachineOperatorBuilder::kWord64Popcnt;
   // We omit kWord32ShiftIsSafe as s[rl]w use 0x3f as a mask rather than 0x1f.
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8