| Issue |
173169
|
| Summary |
Clang hangs on valid code when compiling with profiled data using PGO at -O3
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
helloqirun
|
Reproducible at the latest commit 611a271e8df12d67f567dc9b71.
```
$ clang-trunk -v
clang version 22.0.0git (https://github.com/llvm/llvm-project.git 611a271e8df12d67f567dc9b71bd64d57b0629bb)
Target: x86_64-unknown-linux-gnu
```
The (attached) testcases are large, and I have done a bisection which pointed to the commit 5af27f8c208b4ba13f339801c9188cfc19cebdc0
[aa-105567.c](https://github.com/user-attachments/files/24274923/aa-105567.c)
[prof.txt](https://github.com/user-attachments/files/24274924/prof.txt)
The profiling data is produced by
`$ llvm-profdata merge prof.txt -o prof.profdata`
It compiles at -Os
`clang-trunk -Os -fprofile-instr-use=prof.profdata aa-105567.c`
However, it hangs at -O3.
`$ clang-trunk -O3 -fprofile-instr-use=prof.profdata aa-105567.c`
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