| Issue |
150229
|
| Summary |
[GVN] hits assertion "Cannot split critical edge from IndirectBrInst" in llvm::SplitKnownCriticalEdge
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
tetzank
|
The gvn pass cannot handle the indirectbr instruction with more than one destination. It hits an assertion in llvm::SplitKnownCriticalEdge trying to add a "dead" block after the indirectbr.
The newgvn pass works fine.
Reproducer:
```llvm
define void @foo(i1 %cmp) {
first:
br i1 %cmp, label %exit, label %second
second:
br i1 %cmp, label %ibr, label %exit ; cmp must be false to reach this, branch to ibr never taken
ibr: ; this block is dead
indirectbr ptr blockaddress(@foo, %exit), [label %exit, label %exit] ; double label required, works with just one
exit:
ret void
}
```
`opt --passes=gvn -S minimal.ll`
Related Bug: https://github.com/llvm/llvm-project/issues/49237
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