Remove unnecessary HCompareNumericAndBranch when generating HShr instruction.

src/code-stubs-hydrogen.cc

 // Copyright 2012 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/v8.h"
 
 #include "src/code-stubs.h"
 #include "src/field-index.h"
 #include "src/hydrogen.h"
 #include "src/lithium.h"
@@ skipping 902 matching lines @@
   } else {
     result = BuildBinaryOperation(
             state.op(), left, right,
             left_type, right_type, result_type,
             state.fixed_right_arg(), allocation_mode);
   }
 
   // If we encounter a generic argument, the number conversion is
   // observable, thus we cannot afford to bail out after the fact.
   if (!state.HasSideEffects()) {
-    if (result_type->Is(Type::SignedSmall())) {
-      if (state.op() == Token::SHR) {
-        // TODO(olivf) Replace this by a SmiTagU Instruction.
-        // 0x40000000: this number would convert to negative when interpreting
-        // the register as signed value;
-        IfBuilder if_of(this);
-        if_of.IfNot<HCompareNumericAndBranch>(result,
-            Add<HConstant>(static_cast<int>(SmiValuesAre32Bits()
-                ? 0x80000000 : 0x40000000)), Token::EQ_STRICT);
-        if_of.Then();
-        if_of.ElseDeopt("UInt->Smi oveflow");
-        if_of.End();
-      }
-    }
     result = EnforceNumberType(result, result_type);
   }
 
   // Reuse the double box of one of the operands if we are allowed to (i.e.
   // chained binops).
   if (state.CanReuseDoubleBox()) {
     HValue* operand = (state.mode() == OVERWRITE_LEFT) ? left : right;
     IfBuilder if_heap_number(this);
     if_heap_number.If<HHasInstanceTypeAndBranch>(operand, HEAP_NUMBER_TYPE);
     if_heap_number.Then();
@@ skipping 768 matching lines @@
   return Pop();
 }
 
 
 Handle<Code> KeyedLoadGenericElementStub::GenerateCode() {
   return DoGenerateCode(this);
 }
 
 
 } }  // namespace v8::internal