| Issue |
136532
|
| Summary |
[DebugInfo][LoopDistribute] Removing instructions without salvaging the debug variable Info
|
| Labels |
question,
debuginfo,
llvm:transforms
|
| Assignees |
|
| Reporter |
Apochens
|
I found a case in LoopDistribute, where debug value informaiton is not salvaged when removing unused instructions in the distributed loops. Here is an example: https://godbolt.org/z/soc3YxGMe.
According to the documentation _How to Update Debug Info_, the debug value info should be salvaged. However, in LoopDistribute, although some of the debug value addresses inside a distributed loop become `poison`, the correct addresses of them can be obtained in other distributed loop. In addition, salvaging the debug value info will leads to some long `DIExpression`s in the given example. So, it seems that the current debug info maintenance in LoopDistribute works well.
I'm not sure whether the conclusion is right. So, this issue is currently a question. cc @OCHyams
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