[llvm-dev] The bit pattern after stripPointerCasts()

Matt Arsenault via llvm-dev llvm-dev at lists.llvm.org
Thu Dec 13 19:40:01 PST 2018

> On Dec 14, 2018, at 2:21 PM, Finkel, Hal J. via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> On 12/11/18 6:51 PM, Doerfert, Johannes Rudolf via llvm-dev wrote:
>> Hi,
>> in a recent review [0], Florian Hahn helped me to realize something that
>> was rather surprising to me:
>>   The widely popular and very useful function
>>   llvm::Value::stripPointerCasts() can return a value with a different
>>   bit pattern than the input.
>> Now, I think this should not be the case but I want the hear other
>> opinions. Before I go on, please not that there is at least one location
>> in the code base [1] that makes a wrong assumption about the bit pattern
>> preservation.
> If there's really only one place that gets this wrong (or only a few), I'm inclined to suggest option (1) below and fix this one place.
> Matt, any thoughts on this?
>  -Hal

Yes, I’ve wanted a version which strips addrspacecast and which doesn’t before, so +1

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