S390: [wasm] Int64Lowering of Int64Sub.

src/compiler/s390/instruction-selector-s390.cc

Index: src/compiler/s390/instruction-selector-s390.cc
diff --git a/src/compiler/s390/instruction-selector-s390.cc b/src/compiler/s390/instruction-selector-s390.cc
index dbffdeccf0c3711134ff87b4559d4c3c01294575..d3fa86149dfdd29e1819f62b240340002837193f 100644
--- a/src/compiler/s390/instruction-selector-s390.cc
+++ b/src/compiler/s390/instruction-selector-s390.cc
@@ -754,8 +754,9 @@ void InstructionSelector::VisitWord32Sar(Node* node) {
 }
 
 #if !V8_TARGET_ARCH_S390X
-void InstructionSelector::VisitInt32PairAdd(Node* node) {
-  S390OperandGenerator g(this);
+void VisitPairBinop(InstructionSelector* selector, ArchOpcode opcode,
+                    Node* node) {
+  S390OperandGenerator g(selector);
 
   // We use UseUniqueRegister here to avoid register sharing with the output
   // registers.
@@ -767,7 +768,15 @@ void InstructionSelector::VisitInt32PairAdd(Node* node) {
       g.DefineAsRegister(node),
       g.DefineAsRegister(NodeProperties::FindProjection(node, 1))};
 
-  Emit(kS390_AddPair, 2, outputs, 4, inputs);
+  selector->Emit(opcode, 2, outputs, 4, inputs);
+}
+
+void InstructionSelector::VisitInt32PairAdd(Node* node) {
+  VisitPairBinop(this, kS390_AddPair, node);
+}
+
+void InstructionSelector::VisitInt32PairSub(Node* node) {
+  VisitPairBinop(this, kS390_SubPair, node);
 }
 
 void VisitPairShift(InstructionSelector* selector, ArchOpcode opcode,