[webkit-dev] cti_op_call_ArityCheck question

[Darin Adler]

On Jun 4, 2009, at 1:50 PM, Toshiyasu Morita wrote:

> I don't understand this code in JITStubs::cti_op_call_arityCheck():
>
>     ASSERT(argCount != newCodeBlock->m_numParameters);
>
> It's ensuring that the argument count does not equal the number of  
> parameters expected by the newCodeBlock. I could understand if it  
> was ensuring the argCount was the same, but why different?

This slower code path must only be used when the number of parameters  
is not equal. If it was used when the number of parameters was equal,  
it would be a performance bug.

     -- Darin