Hi,



VRP assumes that it is run after inlining. Therefore, if there is a call 
to __builtin_constant_p with function parameter, it resolve it to false 
to avoid bogus warnings. Since we use this as an early vrp before 
inling, it leads to  wrong code. As a workaround I have disabled it for 
the time being. That is, this patch is not intended for committing but 
just to get the VRP tested.



Original patch which introduced this also talks about doing it earlier.





Thanks,

Kugan