| Issue |
139219
|
| Summary |
[DebugInfo][CodeGenPrepare] Debug value loss caused by deleting the and instruction
|
| Labels |
llvm:codegen,
debuginfo
|
| Assignees |
|
| Reporter |
Apochens
|
CodeGenPrepare pass deletes the `and` instruction without salvaging the debug value: https://godbolt.org/z/3d5f7v3oG
https://github.com/llvm/llvm-project/blob/fa2a6d68c6f35e478af3425760ae39e866049eee/llvm/lib/CodeGen/CodeGenPrepare.cpp#L2274
IR before CodeGenPrepare:
```llvm
entry:
%and = and i32 %a, 4, !dbg !13
#dbg_value(i32 %and, !9, !DIExpression(), !13)
br i1 %c, label %bb0, label %bb2, !dbg !14
```
IR after CodeGenPrepare:
```llvm
entry:
#dbg_value(i32 poison, !9, !DIExpression(), !11)
br i1 %c, label %bb0, label %bb2, !dbg !12
```
I'd like to give a PR to fix it.
cc @OCHyams, could you please give me an example of how regression tests check the debug info in CodeGen? (I'm not very familiar with CodeGen...)
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