Ensure consistent result of transcendental functions.

src/ia32/lithium-ia32.cc

 // Copyright 2012 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 1177 matching lines @@
 LInstruction* LChunkBuilder::DoUnaryMathOperation(HUnaryMathOperation* instr) {
   BuiltinFunctionId op = instr->op();
   if (op == kMathLog) {
     ASSERT(instr->representation().IsDouble());
     ASSERT(instr->value()->representation().IsDouble());
     LOperand* context = UseAny(instr->context());  // Not actually used.
     LOperand* input = UseRegisterAtStart(instr->value());
     LUnaryMathOperation* result = new(zone()) LUnaryMathOperation(context,
                                                                   input);
     return DefineSameAsFirst(result);
-  } else if (op == kMathSin || op == kMathCos) {
+  } else if (op == kMathSin || op == kMathCos || op == kMathTan) {
     LOperand* context = UseFixed(instr->context(), esi);
     LOperand* input = UseFixedDouble(instr->value(), xmm1);
     LUnaryMathOperation* result = new(zone()) LUnaryMathOperation(context,
                                                                   input);
     return MarkAsCall(DefineFixedDouble(result, xmm1), instr);
   } else {
     LOperand* input = UseRegisterAtStart(instr->value());
     LOperand* context = UseAny(instr->context());  // Deferred use by MathAbs.
     if (op == kMathPowHalf) {
       LOperand* temp = TempRegister();
@@ skipping 1207 matching lines @@
 LInstruction* LChunkBuilder::DoLoadFieldByIndex(HLoadFieldByIndex* instr) {
   LOperand* object = UseRegister(instr->object());
   LOperand* index = UseTempRegister(instr->index());
   return DefineSameAsFirst(new(zone()) LLoadFieldByIndex(object, index));
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32