[llvm-commits] [llvm] r71688 - /llvm/trunk/lib/Transforms/Utils/SimplifyCFG.cpp

[Dale Johannesen]

On May 13, 2009, at 1:15 PMPDT, Eli Friedman wrote:

> On Wed, May 13, 2009 at 12:03 PM, Dale Johannesen <dalej at apple.com>  
> wrote:
>> The previous test
>>
>>>>        if (!isa<AllocaInst>(I->getOperand(0)) &&
>>>>            !isa<Constant>(I->getOperand(0)))
>>>>          return false;
>>
>> will reject GEP's won't it?
>
> It will reject GEP instructions, but not GEP constant expressions.

Right, a couple people have explained that.  However, the case we want  
to look for is a weak external, which is undefined and therefore  
cannot be initialized.  I think constant expressions can only arise  
from initializers?