[llvm-dev] Finding "last uses" of an alloca in the function.

Min-Yih Hsu via llvm-dev llvm-dev at lists.llvm.org
Tue Sep 24 09:45:20 PDT 2019


I think you can sort all basic blocks in SCC order by using SCCIterator. Then you can get a total order of all alloca users.

- Min

> On Sep 24, 2019, at 3:22 AM, Gleb Popov via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> Hello, LLVMDev.
> Given an alloca in the entry block, I want to find all its uses after which it is used no more. I tried naive approach by recursively iterating over uses(), but faced 2 problems:
> 1. I have to take into account "indirect" uses introduced by stores/loads.
> 2. In case of loops the use chain I built become circular.
> I came up with an idea by tracking current "use path", but wanted to ask if there is a LLVM analysis for this first.
> Thanks in advance.
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