[llvm] r188507 - Don't do FoldCmpLoadFromIndexedGlobal for non inbounds GEPs

[Matt Arsenault]

On 08/16/2013 11:40 AM, Dan Gohman wrote:
> On Thu, Aug 15, 2013 at 4:11 PM, Matt Arsenault 
> <Matthew.Arsenault at amd.com <mailto:Matthew.Arsenault at amd.com>> wrote:
>
>     Author: arsenm
>     Date: Thu Aug 15 18:11:07 2013
>     New Revision: 188507
>
>     URL: http://llvm.org/viewvc/llvm-project?rev=188507&view=rev
>     Log:
>     Don't do FoldCmpLoadFromIndexedGlobal for non inbounds GEPs
>
>
> I don't see how inbounds is meaningful here. inbounds includes "one 
> past the end" pointers, so there is no guarantee that a load from an 
> inbounds getelementptr pointer value will load from within the bounds 
> of the object.
>
> Dan
>
If you actually load past the end of the object it's undefined, so it 
doesn't matter
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