[wasm] Int64Lowering of I64Shl on ia32.

src/compiler/instruction-selector.cc

Index: src/compiler/instruction-selector.cc
diff --git a/src/compiler/instruction-selector.cc b/src/compiler/instruction-selector.cc
index 814c454d443066636489f574fdd968065da48a98..e8cf4f0e93dcd39a1519227fc02aab3eef03730c 100644
--- a/src/compiler/instruction-selector.cc
+++ b/src/compiler/instruction-selector.cc
@@ -1147,6 +1147,8 @@ void InstructionSelector::VisitNode(Node* node) {
     }
     case IrOpcode::kCheckedStore:
       return VisitCheckedStore(node);
+    case IrOpcode::kWasmWord64Shl:
+      return MarkAsWord32(node), VisitWasmWord64Shl(node);

[titzer, 2016/03/02 22:32:53]

I don't think you want to do MarkAsWord32 here; you probably need to mark both
projections in the platform-specific methods.

[ahaas, 2016/03/04 10:21:11]

Done. PTAL here, I'm not sure I understood you correctly.

     default:
       V8_Fatal(__FILE__, __LINE__, "Unexpected operator #%d:%s @ node #%d",
                node->opcode(), node->op()->mnemonic(), node->id());
@@ -1370,6 +1372,10 @@ void InstructionSelector::VisitBitcastInt64ToFloat64(Node* node) {
 
 #endif  // V8_TARGET_ARCH_32_BIT
 
+// 32 bit targets do not implement the following instructions.
+#if V8_TARGET_ARCH_64_BIT
+void InstructionSelector::VisitWasmWord64Shl(Node* node) { UNIMPLEMENTED(); }
+#endif  // V8_TARGET_ARCH_64_BIT
 
 void InstructionSelector::VisitFinishRegion(Node* node) {
   OperandGenerator g(this);
@@ -1448,6 +1454,7 @@ void InstructionSelector::VisitProjection(Node* node) {
     case IrOpcode::kTryTruncateFloat64ToInt64:
     case IrOpcode::kTryTruncateFloat32ToUint64:
     case IrOpcode::kTryTruncateFloat64ToUint64:
+    case IrOpcode::kWasmWord64Shl:
       if (ProjectionIndexOf(node->op()) == 0u) {
         Emit(kArchNop, g.DefineSameAsFirst(node), g.Use(value));
       } else {