PPC: [turbofan] Introduce integer multiplication with overflow.

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

Index: src/compiler/ppc/instruction-selector-ppc.cc
diff --git a/src/compiler/ppc/instruction-selector-ppc.cc b/src/compiler/ppc/instruction-selector-ppc.cc
index 85eeb2c2a1d33178fecff159eb80510fc55a8b3b..65e36aa7e48295cb727dd7e3d55342ceb9b6d06b 100644
--- a/src/compiler/ppc/instruction-selector-ppc.cc
+++ b/src/compiler/ppc/instruction-selector-ppc.cc
@@ -989,6 +989,36 @@ void InstructionSelector::VisitInt64Sub(Node* node) {
 }
 #endif
 
+namespace {
+
+void VisitCompare(InstructionSelector* selector, InstructionCode opcode,
+                  InstructionOperand left, InstructionOperand right,
+                  FlagsContinuation* cont);
+void EmitInt32MulWithOverflow(InstructionSelector* selector, Node* node,
+                              FlagsContinuation* cont) {
+  PPCOperandGenerator g(selector);
+  Int32BinopMatcher m(node);
+  InstructionOperand result_operand = g.DefineAsRegister(node);
+  InstructionOperand high32_operand = g.TempRegister();
+  InstructionOperand temp_operand = g.TempRegister();
+  {
+    InstructionOperand outputs[] = {result_operand, high32_operand};
+    InstructionOperand inputs[] = {g.UseRegister(m.left().node()),
+                                   g.UseRegister(m.right().node())};
+    selector->Emit(kPPC_Mul32WithHigh32, 2, outputs, 2, inputs);
+  }
+  {
+    InstructionOperand shift_31 = g.UseImmediate(31);
+    InstructionOperand outputs[] = {temp_operand};
+    InstructionOperand inputs[] = {result_operand, shift_31};
+    selector->Emit(kPPC_ShiftRightAlg32, 1, outputs, 2, inputs);
+  }
+
+  VisitCompare(selector, kPPC_Cmp32, high32_operand, temp_operand, cont);
+}
+
+}  // namespace
+
 
 void InstructionSelector::VisitInt32Mul(Node* node) {
   VisitRRR(this, kPPC_Mul32, node);
@@ -1626,6 +1656,9 @@ void VisitWordCompareZero(InstructionSelector* selector, Node* user,
                 return VisitBinop<Int32BinopMatcher>(selector, node,
                                                      kPPC_SubWithOverflow32,
                                                      kInt16Imm_Negate, cont);
+              case IrOpcode::kInt32MulWithOverflow:
+                cont->OverwriteAndNegateIfEqual(kNotEqual);
+                return EmitInt32MulWithOverflow(selector, node, cont);
 #if V8_TARGET_ARCH_PPC64
               case IrOpcode::kInt64AddWithOverflow:
                 cont->OverwriteAndNegateIfEqual(kOverflow);
@@ -1820,6 +1853,15 @@ void InstructionSelector::VisitUint64LessThanOrEqual(Node* node) {
 }
 #endif
 
+void InstructionSelector::VisitInt32MulWithOverflow(Node* node) {
+  if (Node* ovf = NodeProperties::FindProjection(node, 1)) {
+    FlagsContinuation cont = FlagsContinuation::ForSet(kNotEqual, ovf);
+    return EmitInt32MulWithOverflow(this, node, &cont);
+  }
+  FlagsContinuation cont;
+  EmitInt32MulWithOverflow(this, node, &cont);
+}
+
 
 void InstructionSelector::VisitFloat32Equal(Node* node) {
   FlagsContinuation cont = FlagsContinuation::ForSet(kEqual, node);