Move swapping of operands for commutative binary operations to the lithium IR...

src/arm/lithium-arm.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 712 matching lines @@
   return AssignEnvironment(new LDeoptimize);
 }
 
 
 LInstruction* LChunkBuilder::DoBit(Token::Value op,
                                    HBitwiseBinaryOperation* instr) {
   ASSERT(instr->representation().IsInteger32());
   ASSERT(instr->left()->representation().IsInteger32());
   ASSERT(instr->right()->representation().IsInteger32());
 
-  LOperand* left = UseRegisterAtStart(instr->LeastConstantOperand());
-  LOperand* right = UseOrConstantAtStart(instr->MostConstantOperand());
+  LOperand* left = UseRegisterAtStart(instr->left()->IsConstant()
+                                      ? instr->right()
+                                      : instr->left());
+  LOperand* right = UseOrConstantAtStart(instr->left()->IsConstant()
+                                         ? instr->left()
+                                         : instr->right());
   return DefineSameAsFirst(new LBitI(op, left, right));
 }
 
 
 LInstruction* LChunkBuilder::DoShift(Token::Value op,
                                      HBitwiseBinaryOperation* instr) {
   ASSERT(instr->representation().IsInteger32());
   ASSERT(instr->OperandAt(0)->representation().IsInteger32());
   ASSERT(instr->OperandAt(1)->representation().IsInteger32());
   LOperand* left = UseRegisterAtStart(instr->OperandAt(0));
@@ skipping 522 matching lines @@
     LArithmeticD* result = new LArithmeticD(Token::MOD, left, right);
     return MarkAsCall(DefineFixedDouble(result, d1), instr);
   }
 }
 
 
 LInstruction* LChunkBuilder::DoMul(HMul* instr) {
   if (instr->representation().IsInteger32()) {
     ASSERT(instr->left()->representation().IsInteger32());
     ASSERT(instr->right()->representation().IsInteger32());
-    LOperand* left = UseRegisterAtStart(instr->LeastConstantOperand());
-    LOperand* right = UseOrConstant(instr->MostConstantOperand());
+    LOperand* left = UseRegisterAtStart(instr->left()->IsConstant()
+                                        ? instr->right()
+                                        : instr->left());
+    LOperand* right = UseOrConstant(instr->left()->IsConstant()
+                                    ? instr->left()
+                                    : instr->right());
     LOperand* temp = NULL;
     if (instr->CheckFlag(HValue::kBailoutOnMinusZero)) {
       temp = TempRegister();
     }
     LMulI* mul = new LMulI(left, right, temp);
     return AssignEnvironment(DefineSameAsFirst(mul));
   } else if (instr->representation().IsDouble()) {
     return DoArithmeticD(Token::MUL, instr);
   } else {
     return DoArithmeticT(Token::MUL, instr);
@@ skipping 18 matching lines @@
   } else {
     return DoArithmeticT(Token::SUB, instr);
   }
 }
 
 
 LInstruction* LChunkBuilder::DoAdd(HAdd* instr) {
   if (instr->representation().IsInteger32()) {
     ASSERT(instr->left()->representation().IsInteger32());
     ASSERT(instr->right()->representation().IsInteger32());
-    LOperand* left = UseRegisterAtStart(instr->LeastConstantOperand());
-    LOperand* right = UseOrConstantAtStart(instr->MostConstantOperand());
+    LOperand* left = UseRegisterAtStart(instr->left()->IsConstant()
+                                        ? instr->right()
+                                        : instr->left());
+    LOperand* right = UseOrConstantAtStart(instr->left()->IsConstant()
+                                           ? instr->left()
+                                           : instr->right());
     LAddI* add = new LAddI(left, right);
     LInstruction* result = DefineSameAsFirst(add);
     if (instr->CheckFlag(HValue::kCanOverflow)) {
       result = AssignEnvironment(result);
     }
     return result;
   } else if (instr->representation().IsDouble()) {
     return DoArithmeticD(Token::ADD, instr);
   } else {
     ASSERT(instr->representation().IsTagged());
@@ skipping 512 matching lines @@
 
 
 LInstruction* LChunkBuilder::DoLeaveInlined(HLeaveInlined* instr) {
   HEnvironment* outer = current_block_->last_environment()->outer();
   current_block_->UpdateEnvironment(outer);
   return NULL;
 }
 
 
 } }  // namespace v8::internal