[llvm-dev] Unreferenced BlockAddress broke IR compilation?

[Arthur Eubanks via llvm-dev]

Does https://reviews.llvm.org/rG90af134473331095adcf2c7e4a511ac35d9f2f4a
help?

On Sun, Apr 11, 2021 at 8:41 PM Zhang via llvm-dev <llvm-dev at lists.llvm.org>
wrote:

> Hi:
> I'm currently using 176249bd @ release/11.x for a downstream project that
> contains two passes.
> The first pass randomly introduces DeadBasicBlocks (BasicBlocks that are
> not branched to in any way).
> The second pass creates BlockAddress of all BasicBlocks in a function, put
> them into a GlobalVariable and patch br instructions to GEP+Load+indibr
> instructions.
>
> When the first pass didn't create deadBasicBlock, the transformed IR fully
> works as intended, however if deadbasicblock is introduced, all elements in
> the GV created in the second pass references to the same address in the
> compiled object file.
>
> Not sure if this is a bug on LLVM side or not
>
>
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