MIPS64: [turbofan] Improve changes from and to Smi.

src/compiler/mips64/instruction-selector-mips64.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/base/bits.h"
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
 
@@ skipping 268 matching lines @@
   VisitRRO(this, kMips64Shr, node);
 }
 
 
 void InstructionSelector::VisitWord32Sar(Node* node) {
   VisitRRO(this, kMips64Sar, node);
 }
 
 
 void InstructionSelector::VisitWord64Shl(Node* node) {
+  Mips64OperandGenerator g(this);
+  Int64BinopMatcher m(node);
+  if ((m.left().IsChangeInt32ToInt64() || m.left().IsChangeUint32ToUint64()) &&
+      m.right().IsInRange(32, 63)) {
+    // There's no need to sign/zero-extend to 64-bit if we shift out the upper
+    // 32 bits anyway.
+    Emit(kMips64Dshl, g.DefineSameAsFirst(node),
+         g.UseRegister(m.left().node()->InputAt(0)),
+         g.UseImmediate(m.right().node()));
+    return;
+  }
   VisitRRO(this, kMips64Dshl, node);
 }
 
 
 void InstructionSelector::VisitWord64Shr(Node* node) {
   VisitRRO(this, kMips64Dshr, node);
 }
 
 
 void InstructionSelector::VisitWord64Sar(Node* node) {
@@ skipping 223 matching lines @@
 
 void InstructionSelector::VisitChangeUint32ToUint64(Node* node) {
   Mips64OperandGenerator g(this);
   Emit(kMips64Dext, g.DefineAsRegister(node), g.UseRegister(node->InputAt(0)),
        g.TempImmediate(0), g.TempImmediate(32));
 }
 
 
 void InstructionSelector::VisitTruncateInt64ToInt32(Node* node) {
   Mips64OperandGenerator g(this);
+  Node* value = node->InputAt(0);
+  if (CanCover(node, value)) {
+    switch (value->opcode()) {
+      case IrOpcode::kWord64Sar: {
+        Int64BinopMatcher m(value);
+        if (m.right().IsInRange(32, 63)) {
+          // After smi untagging no need for truncate. Combine sequence.
+          Emit(kMips64Dsar, g.DefineSameAsFirst(node),
+               g.UseRegister(m.left().node()), g.TempImmediate(kSmiShift));
+          return;
+        }
+        break;
+      }
+      default:
+        break;
+    }
+  }
   Emit(kMips64Ext, g.DefineAsRegister(node), g.UseRegister(node->InputAt(0)),
        g.TempImmediate(0), g.TempImmediate(32));
 }
 
 
 void InstructionSelector::VisitTruncateFloat64ToFloat32(Node* node) {
   VisitRR(this, kMips64CvtSD, node);
 }
 
 
@@ skipping 775 matching lines @@
 // static
 MachineOperatorBuilder::Flags
 InstructionSelector::SupportedMachineOperatorFlags() {
   return MachineOperatorBuilder::kFloat64RoundDown |
          MachineOperatorBuilder::kFloat64RoundTruncate;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8