MIPS:[turbofan] Improve boolean materialization compares.

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 949 matching lines @@
 // Shared routine for multiple word compare operations.
 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)) {
-    VisitCompare(selector, opcode, g.UseRegister(left), g.UseImmediate(right),
-                 cont);
+    switch (cont->condition()) {
+      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();
-    VisitCompare(selector, opcode, g.UseRegister(right), g.UseImmediate(left),
-                 cont);
+    switch (cont->condition()) {
+      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);
+    }
   } else {
     VisitCompare(selector, opcode, g.UseRegister(left), g.UseRegister(right),
                  cont);
   }
 }
 
 
 void VisitWord32Compare(InstructionSelector* selector, Node* node,
                         FlagsContinuation* cont) {
   VisitWordCompare(selector, node, kMips64Cmp, cont, false);
@@ skipping 331 matching lines @@
 // static
 MachineOperatorBuilder::Flags
 InstructionSelector::SupportedMachineOperatorFlags() {
   return MachineOperatorBuilder::kFloat64RoundDown |
          MachineOperatorBuilder::kFloat64RoundTruncate;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8