[llvm] r179569 - We are not able to bitcast a pointer to an integral value.

[Bill Wendling]

On Apr 16, 2013, at 9:42 AM, Duncan Sands <baldrick at free.fr> wrote:

> Hi Bill,
> 
> On 16/04/13 00:33, Bill Wendling wrote:
>> Author: void
>> Date: Mon Apr 15 17:33:50 2013
>> New Revision: 179569
>> 
>> URL: http://llvm.org/viewvc/llvm-project?rev=179569&view=rev
>> Log:
>> We are not able to bitcast a pointer to an integral value.
>> 
>> Two return types are not equivalent if one is a pointer and the other is an
>> integral. This is because we cannot bitcast a pointer to an integral value.
>> PR15185
> 
> you can always ptrtoint it.  I thought the idea of mergefunctions was to
> ignore types, and consider two values the same if they have the same bits,
> regardless of whether they are pointers, integers, floats or whatever.  If
> so, it seems a pity to suddenly decide that type differences matter.
> 
It wasn't me who decided that, but the bitcast instruction. :-) It expressly prohibits casting a pointer to an integer value.

-bw