Revert change 5989, which causes failures in some benchmarks.

src/ia32/lithium-ia32.cc

 // Copyright 2010 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 1337 matching lines @@
 
 LInstruction* LChunkBuilder::DoCallConstantFunction(
     HCallConstantFunction* instr) {
   argument_count_ -= instr->argument_count();
   return MarkAsCall(DefineFixed(new LCallConstantFunction, eax), instr);
 }
 
 
 LInstruction* LChunkBuilder::DoUnaryMathOperation(HUnaryMathOperation* instr) {
   MathFunctionId op = instr->op();
-  if (op == kMathLog) {
-    LOperand* input = UseFixedDouble(instr->value(), xmm1);
-    LInstruction* result = new LUnaryMathOperation(input);
-    return MarkAsCall(DefineFixedDouble(result, xmm1), instr);
-  } else {
-    LOperand* input = UseRegisterAtStart(instr->value());
-    LInstruction* result = new LUnaryMathOperation(input);
-    switch (op) {
-      case kMathAbs:
-        return AssignEnvironment(AssignPointerMap(DefineSameAsFirst(result)));
-      case kMathFloor:
-        return AssignEnvironment(DefineAsRegister(result));
-      case kMathRound:
-        return AssignEnvironment(DefineAsRegister(result));
-      case kMathSqrt:
-        return DefineSameAsFirst(result);
-      case kMathPowHalf:
-        return AssignEnvironment(DefineSameAsFirst(result));
-      default:
-        UNREACHABLE();
-        return NULL;
-    }
+  LOperand* input = UseRegisterAtStart(instr->value());
+  LInstruction* result = new LUnaryMathOperation(input);
+  switch (op) {
+    case kMathAbs:
+      return AssignEnvironment(AssignPointerMap(DefineSameAsFirst(result)));
+    case kMathFloor:
+      return AssignEnvironment(DefineAsRegister(result));
+    case kMathRound:
+      return AssignEnvironment(DefineAsRegister(result));
+    case kMathSqrt:
+      return DefineSameAsFirst(result);
+    case kMathPowHalf:
+      return AssignEnvironment(DefineSameAsFirst(result));
+    default:
+      UNREACHABLE();
+      return NULL;
   }
 }
 
 
 LInstruction* LChunkBuilder::DoCallKeyed(HCallKeyed* instr) {
   ASSERT(instr->key()->representation().IsTagged());
   argument_count_ -= instr->argument_count();
   UseFixed(instr->key(), ecx);
   return MarkAsCall(DefineFixed(new LCallKeyed, eax), instr);
 }
@@ skipping 715 matching lines @@
 void LPointerMap::PrintTo(StringStream* stream) const {
   stream->Add("{");
   for (int i = 0; i < pointer_operands_.length(); ++i) {
     if (i != 0) stream->Add(";");
     pointer_operands_[i]->PrintTo(stream);
   }
   stream->Add("} @%d", position());
 }
 
 } }  // namespace v8::internal