X64: Remove optimization of SHR by constant, due to unfixed bug.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2663 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/x64/codegen-x64.cc

@@ -5258,58 +5258,6 @@ void CodeGenerator::ConstantSmiBinaryOperation(Token::Value op,
       }
       break;
 
-    case Token::SHL:
-      if (reversed) {
-        Result constant_operand(value);
-        LikelySmiBinaryOperation(op, &constant_operand, operand,
-                                 overwrite_mode);
-      } else {
-        // Only the least significant 5 bits of the shift value are used.
-        // In the slow case, this masking is done inside the runtime call.
-        int shift_value = int_value & 0x1f;
-        operand->ToRegister();
-        if (shift_value == 0) {
-          // Spill operand so it can be overwritten in the slow case.
-          frame_->Spill(operand->reg());
-          DeferredInlineSmiOperation* deferred =
-              new DeferredInlineSmiOperation(op,
-                                             operand->reg(),
-                                             operand->reg(),
-                                             smi_value,
-                                             overwrite_mode);
-          __ testl(operand->reg(), Immediate(kSmiTagMask));
-          deferred->Branch(not_zero);
-          deferred->BindExit();
-          frame_->Push(operand);
-        } else {
-          // Use a fresh temporary for nonzero shift values.
-          Result answer = allocator()->Allocate();
-          ASSERT(answer.is_valid());
-          DeferredInlineSmiOperation* deferred =
-              new DeferredInlineSmiOperation(op,
-                                             answer.reg(),
-                                             operand->reg(),
-                                             smi_value,
-                                             overwrite_mode);
-          __ testl(operand->reg(), Immediate(kSmiTagMask));
-          deferred->Branch(not_zero);
-          __ movl(answer.reg(), operand->reg());
-          ASSERT(kSmiTag == 0);  // adjust code if not the case
-          // We do no shifts, only the Smi conversion, if shift_value is 1.
-          if (shift_value > 1) {
-            __ shll(answer.reg(), Immediate(shift_value - 1));
-          }
-          // Convert int result to Smi, checking that it is in int range.
-          ASSERT(kSmiTagSize == 1);  // adjust code if not the case
-          __ addl(answer.reg(), answer.reg());
-          deferred->Branch(overflow);
-          deferred->BindExit();
-          operand->Unuse();
-          frame_->Push(&answer);
-        }
-      }
-      break;
-
     case Token::BIT_OR:
     case Token::BIT_XOR:
     case Token::BIT_AND: {