| Issue |
176421
|
| Summary |
[WinEH] Incorrect block label reference in unwind table
|
| Labels |
backend:AArch64,
miscompilation,
platform:windows
|
| Assignees |
|
| Reporter |
nikic
|
```llvm
target triple = "aarch64-pc-windows-msvc"
declare void @func()
define void @test(ptr %p) personality ptr @__CxxFrameHandler3 {
%v0 = load i32, ptr %p
%v1 = load i32, ptr %p
%xor = xor i32 %v0, %v1
%cmp = icmp eq i32 %xor, 0
br i1 %cmp, label %exit, label %bb
bb:
invoke void @func()
to label %unreachable unwind label %unwind
unreachable:
unreachable
unwind:
%cp = cleanuppad within none []
store volatile i32 0, ptr %p
cleanupret from %cp unwind to caller
exit:
ret void
}
declare i32 @__CxxFrameHandler3(...)
```
Produces something like this:
```
$stateUnwindMap$test:
.word -1 // ToState
.word "?dtor$-1@?0?test@4HA"@IMGREL // Action
```
Note the `?dtor$-1` referring to an unnumbered MBB. This ultimately causes linker errors.
Only observed on AArch64 Windows.
![]()
_______________________________________________
llvm-bugs mailing list
[email protected]
https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
