__ j(not_zero, deferred->enter(), not_taken);
__ sar(ebx, kSmiTagSize);
__ shl(ebx, shift_value);
- // This is the Smi check for the shifted result.
- // After signed subtraction of 0xc0000000, the valid
- // Smis are positive.
- __ cmp(ebx, 0xc0000000);
- __ j(sign, deferred->enter(), not_taken);
- // tag result and store it in TOS (eax)
- ASSERT(kSmiTagSize == times_2); // adjust code if not the case
- __ lea(eax, Operand(ebx, ebx, times_1, kSmiTag));
+ // Convert the int to a Smi, and check that it is in
+ // the range of valid Smis.
+ ASSERT(kSmiTagSize == times_2); // Adjust code if not true.
+ ASSERT(kSmiTag == 0); // Adjust code if not true.
+ __ add(ebx, Operand(ebx));
+ __ j(overflow, deferred->enter(), not_taken);
+ __ mov(eax, Operand(ebx));
+
__ bind(deferred->exit());
frame_->Push(eax);
}