[PATCH] D132657: [DSE] Eliminate noop store even through has clobbering between LoadI and StoreI

Fri Sep 2 02:58:00 PDT 2022

StephenFan added a comment.

In D132657#3766519 <https://reviews.llvm.org/D132657#3766519>, @nikic wrote:

> In D132657#3766472 <https://reviews.llvm.org/D132657#3766472>, @StephenFan wrote:
>
>> In D132657#3766284 <https://reviews.llvm.org/D132657#3766284>, @nikic wrote:
>>
>>> In D132657#3766253 <https://reviews.llvm.org/D132657#3766253>, @efriedma wrote:
>>>
>>>> Do you need some sort of alignment check here?
>>>
>>> Gah, you're right. If it doesn't happen to be a splat value, then writes at an offset become a problem.
>>
>> https://godbolt.org/z/5oEh8rdY6 Is this the problem you mentioned?
>
> Yes, exactly.

I found GCC would delete the last store. Is this a bug in GCC?

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  https://reviews.llvm.org/D132657/new/

https://reviews.llvm.org/D132657