[turbofan] Introduce integer multiplication with overflow.

src/compiler/x64/instruction-selector-x64.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 <algorithm>
 
 #include "src/base/adapters.h"
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
@@ skipping 821 matching lines @@
                    g.UseImmediate(right));
   } else {
     if (g.CanBeBetterLeftOperand(right)) {
       std::swap(left, right);
     }
     selector->Emit(opcode, g.DefineSameAsFirst(node), g.UseRegister(left),
                    g.Use(right));
   }
 }
 
-
 void VisitMulHigh(InstructionSelector* selector, Node* node,
                   ArchOpcode opcode) {
   X64OperandGenerator g(selector);
   Node* left = node->InputAt(0);
   Node* right = node->InputAt(1);
   if (selector->IsLive(left) && !selector->IsLive(right)) {
     std::swap(left, right);
   }
   InstructionOperand temps[] = {g.TempRegister(rax)};
   // TODO(turbofan): We use UseUniqueRegister here to improve register
@@ skipping 27 matching lines @@
   Int32ScaleMatcher m(node, true);
   if (m.matches()) {
     Node* index = node->InputAt(0);
     Node* base = m.power_of_two_plus_one() ? index : nullptr;
     EmitLea(this, kX64Lea32, node, index, m.scale(), base, nullptr);
     return;
   }
   VisitMul(this, node, kX64Imul32);
 }
 
+void InstructionSelector::VisitInt32MulWithOverflow(Node* node) {
+  // TODO(mvstanton): Use Int32ScaleMatcher somehow.
+  if (Node* ovf = NodeProperties::FindProjection(node, 1)) {
+    FlagsContinuation cont = FlagsContinuation::ForSet(kOverflow, ovf);
+    return VisitBinop(this, node, kX64Imul32, &cont);
+  }
+  FlagsContinuation cont;
+  VisitBinop(this, node, kX64Imul32, &cont);
+}
 
 void InstructionSelector::VisitInt64Mul(Node* node) {
   VisitMul(this, node, kX64Imul);
 }
 
-
 void InstructionSelector::VisitInt32MulHigh(Node* node) {
   VisitMulHigh(this, node, kX64ImulHigh32);
 }
 
 
 void InstructionSelector::VisitInt32Div(Node* node) {
   VisitDiv(this, node, kX64Idiv32);
 }
 
 
@@ skipping 853 matching lines @@
           Node* const node = value->InputAt(0);
           Node* const result = NodeProperties::FindProjection(node, 0);
           if (result == nullptr || selector->IsDefined(result)) {
             switch (node->opcode()) {
               case IrOpcode::kInt32AddWithOverflow:
                 cont->OverwriteAndNegateIfEqual(kOverflow);
                 return VisitBinop(selector, node, kX64Add32, cont);
               case IrOpcode::kInt32SubWithOverflow:
                 cont->OverwriteAndNegateIfEqual(kOverflow);
                 return VisitBinop(selector, node, kX64Sub32, cont);
+              case IrOpcode::kInt32MulWithOverflow:
+                cont->OverwriteAndNegateIfEqual(kOverflow);
+                return VisitBinop(selector, node, kX64Imul32, cont);
               case IrOpcode::kInt64AddWithOverflow:
                 cont->OverwriteAndNegateIfEqual(kOverflow);
                 return VisitBinop(selector, node, kX64Add, cont);
               case IrOpcode::kInt64SubWithOverflow:
                 cont->OverwriteAndNegateIfEqual(kOverflow);
                 return VisitBinop(selector, node, kX64Sub, cont);
               default:
                 break;
             }
           }
@@ skipping 357 matching lines @@
 // static
 MachineOperatorBuilder::AlignmentRequirements
 InstructionSelector::AlignmentRequirements() {
   return MachineOperatorBuilder::AlignmentRequirements::
       FullUnalignedAccessSupport();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8