MIPS: [turbofan] Improve test and equality compare with zero and constants.

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 1001 matching lines @@
 void VisitWordCompare(InstructionSelector* selector, Node* node,
                       InstructionCode opcode, FlagsContinuation* cont,
                       bool commutative) {
   Mips64OperandGenerator g(selector);
   Node* left = node->InputAt(0);
   Node* right = node->InputAt(1);
 
   // Match immediates on left or right side of comparison.
   if (g.CanBeImmediate(right, opcode)) {
     switch (cont->condition()) {
+      case kEqual:
+      case kNotEqual:
+        if (cont->IsSet()) {
+          VisitCompare(selector, opcode, g.UseRegister(left),
+                       g.UseImmediate(right), cont);
+        } else {
+          VisitCompare(selector, opcode, g.UseRegister(left),
+                       g.UseRegister(right), cont);
+        }
+        break;
       case kSignedLessThan:
       case kSignedGreaterThanOrEqual:
       case kUnsignedLessThan:
       case kUnsignedGreaterThanOrEqual:
         VisitCompare(selector, opcode, g.UseRegister(left),
                      g.UseImmediate(right), cont);
         break;
       default:
         VisitCompare(selector, opcode, g.UseRegister(left),
                      g.UseRegister(right), cont);
     }
   } else if (g.CanBeImmediate(left, opcode)) {
     if (!commutative) cont->Commute();
     switch (cont->condition()) {
+      case kEqual:
+      case kNotEqual:
+        if (cont->IsSet()) {
+          VisitCompare(selector, opcode, g.UseRegister(right),
+                       g.UseImmediate(left), cont);
+        } else {
+          VisitCompare(selector, opcode, g.UseRegister(right),
+                       g.UseRegister(left), cont);
+        }
+        break;
       case kSignedLessThan:
       case kSignedGreaterThanOrEqual:
       case kUnsignedLessThan:
       case kUnsignedGreaterThanOrEqual:
         VisitCompare(selector, opcode, g.UseRegister(right),
                      g.UseImmediate(left), cont);
         break;
       default:
         VisitCompare(selector, opcode, g.UseRegister(right),
                      g.UseRegister(left), cont);
@@ skipping 338 matching lines @@
 // static
 MachineOperatorBuilder::Flags
 InstructionSelector::SupportedMachineOperatorFlags() {
   return MachineOperatorBuilder::kFloat64RoundDown |
          MachineOperatorBuilder::kFloat64RoundTruncate;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8