1 files changed, 50 insertions, 0 deletions
diff --git a/llvm/test/Transforms/SimplifyCFG/bbi-23595.ll b/llvm/test/Transforms/SimplifyCFG/bbi-23595.ll
new file mode 100644
index 00000000000..676a80bb33f
--- /dev/null
+++ b/llvm/test/Transforms/SimplifyCFG/bbi-23595.ll
@@ -0,0 +1,50 @@
+; RUN: opt < %s -S -simplifycfg | FileCheck %s
+
+; In 'simplifycfg', during the flattening of a 'br', the instructions for the
+; 'true' and 'false' parts, are moved out from their respective basic blocks.
+; Their original debug locations (DILocations) and debug intrinsic instructions
+; (dbg.values) are removed.
+; As those basic blocks are now empty, their associated labels are removed.
+;
+; For the given test case, the labels 'W' and 'cleanup4' are removed.
+; We're expecting the dbg.label associated with 'W' to disappear, because
+; the 'W' label was removed.
+
+; CHECK-LABEL: _Z7test_itv()
+; CHECK:       entry:
+; CHECK-NEXT:    %retval.0 = select i1 undef, i16 1, i16 0
+; CHECK-NEXT:    ret i16 0
+
+define i16 @_Z7test_itv() {
+entry:
+  br label %sw.bb
+
+sw.bb:                                            ; preds = %entry
+  br i1 undef, label %W, label %cleanup4
+
+W:                                                ; preds = %sw.bb
+  call void @llvm.dbg.label(metadata !1), !dbg !8
+  br label %cleanup4
+
+cleanup4:                                         ; preds = %W, %sw.bb
+  %retval.0 = phi i16 [ 1, %W ], [ 0, %sw.bb ]
+  ret i16 0
+}
+
+; Function Attrs: nounwind readnone speculatable
+declare void @llvm.dbg.label(metadata) #0
+
+attributes #0 = { nounwind readnone speculatable }
+
+!llvm.dbg.cu = !{}
+!llvm.module.flags = !{!0}
+
+!0 = !{i32 2, !"Debug Info Version", i32 3}
+!1 = !DILabel(scope: !2, name: "W", file: !3, line: 47)
+!2 = distinct !DILexicalBlock(scope: !4, file: !3, line: 40, column: 3)
+!3 = !DIFile(filename: "foo.c", directory: "./")
+!4 = distinct !DISubprogram(name: "test_it", scope: !3, file: !3, line: 35, type: !5, scopeLine: 36, unit: !7)
+!5 = !DISubroutineType(types: !6)
+!6 = !{}
+!7 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug)
+!8 = !DILocation(line: 47, column: 2, scope: !2)