efriedma-quic wrote:
> The ubsan handler cannot be eliminated because inaccessiblemem: readwrite
> indicates that it has externally observable side effects.
That is not how things work. For example:
```
$ echo "declare void @g() define void @f() nounwind { call void @g()
memory(argmem: read, inaccessiblemem: readwrite) willreturn unreachable }" |
opt -O3 -S
; ModuleID = '<stdin>'
source_filename = "<stdin>"
; Function Attrs: mustprogress nofree norecurse noreturn nosync nounwind
willreturn memory(none)
define void @f() local_unnamed_addr #0 {
unreachable
}
attributes #0 = { mustprogress nofree norecurse noreturn nosync nounwind
willreturn memory(none) }
```
https://github.com/llvm/llvm-project/pull/130990
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