[llvm] [ARM] Ignore `ANNOTATION_LABEL` node in scheduler (PR #190499)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-llvm-selectiondag

@llvm/pr-subscribers-backend-arm

Author: Trung Nguyen (trungnt2910)

<details>
<summary>Changes</summary>

This fixes a crash in `clang` for `armv7` targets when optimizations are enabled.

Fixes #<!-- -->190497

---
Full diff: https://github.com/llvm/llvm-project/pull/190499.diff


2 Files Affected:

- (modified) llvm/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp (+1) 
- (added) llvm/test/CodeGen/ARM/pr190497.ll (+13) 


``````````diff
diff --git a/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp b/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
index 12fc26d949581..bc747d250afae 100644
--- a/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
@@ -712,6 +712,7 @@ void ScheduleDAGRRList::EmitNode(SUnit *SU) {
   case ISD::CopyToReg:
   case ISD::CopyFromReg:
   case ISD::EH_LABEL:
+  case ISD::ANNOTATION_LABEL:
     // Noops don't affect the scoreboard state. Copies are likely to be
     // removed.
     return;
diff --git a/llvm/test/CodeGen/ARM/pr190497.ll b/llvm/test/CodeGen/ARM/pr190497.ll
new file mode 100644
index 0000000000000..8d852819a09de
--- /dev/null
+++ b/llvm/test/CodeGen/ARM/pr190497.ll
@@ -0,0 +1,13 @@
+; RUN: llc -mtriple=thumbv7-windows-msvc -O1 < %s
+
+; No check in a crash test
+
+declare void @llvm.codeview.annotation(metadata)
+
+define void @foo() {
+entry:
+  call void @llvm.codeview.annotation(metadata !0)
+  ret void
+}
+
+!0 = !{!"annotation"}

``````````

</details>


https://github.com/llvm/llvm-project/pull/190499