| Issue |
71312
|
| Summary |
SIGILL with new libc qsort_r implementation in BranchFolder::MergePotentialsElt
|
| Labels |
libc
|
| Assignees |
|
| Reporter |
crrodriguez
|
https://github.com/llvm/llvm-project/blob/7c1ad51e018c5a1517ca6fb58a4d7027a8bec64e/llvm/lib/CodeGen/BranchFolding.cpp#L491
Now glibc compares an object with itself, just like when _GLIBCXX_DEBUG is enabled therefore explicit unreachable triggers. this breaks at least any rustc compiler available.
```
#0 0x000015129e40516a in int llvm::array_pod_sort_comparator<llvm::BranchFolder::MergePotentialsElt>(void const*, void const*) () from /home/crrodriguez/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/[libLLVM-17-rust-1.75.0-nightly.so](http://libllvm-17-rust-1.75.0-nightly.so/)
#1 0x00001512a0043779 in __GI___qsort_r (pbase=0x15128c90bd80, total_elems=<optimized out>, size=0x10, cmp=<optimized out>, arg=<optimized out>) at qsort.c:335
#2 0x000015129e4df6e6 in llvm::BranchFolder::TryTailMergeBlocks(llvm::MachineBasicBlock*, llvm::MachineBasicBlock*, unsigned int) () from /home/crrodriguez/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/[libLLVM-17-rust-1.75.0-nightly.so](http://libllvm-17-rust-1.75.0-nightly.so/)
```
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