[llvm] [CodeGen] Use optimized domtree for MachineFunction (PR #102107)
Alexis Engelke via llvm-commits
llvm-commits at lists.llvm.org
Tue Aug 6 22:36:48 PDT 2024
aengelke wrote:
Thanks for catching this! I can take a look, but could you provide instructions to reproduce this? (Or maybe you could try this patch and see whether this fixes the problem?)
```diff
diff --git a/llvm/lib/CodeGen/MachineBlockPlacement.cpp b/llvm/lib/CodeGen/MachineBlockPlacement.cpp
index 9010c3cfc424..4ff24ee68b74 100644
--- a/llvm/lib/CodeGen/MachineBlockPlacement.cpp
+++ b/llvm/lib/CodeGen/MachineBlockPlacement.cpp
@@ -3649,7 +3649,7 @@ void MachineBlockPlacement::assignBlockOrder(
const std::vector<const MachineBasicBlock *> &NewBlockOrder) {
assert(F->size() == NewBlockOrder.size() && "Incorrect size of block order");
F->RenumberBlocks();
- MPDT->updateBlockNumbers();
+ MPDT = nullptr;
bool HasChanges = false;
for (size_t I = 0; I < NewBlockOrder.size(); I++) {
```
https://github.com/llvm/llvm-project/pull/102107
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