1 files changed, 51 insertions, 0 deletions
diff --git a/llvm/test/Transforms/HotColdSplit/delete-use-without-def-dbg-val.ll b/llvm/test/Transforms/HotColdSplit/delete-use-without-def-dbg-val.ll
new file mode 100644
index 00000000000..97f5cb8ba6c
--- /dev/null
+++ b/llvm/test/Transforms/HotColdSplit/delete-use-without-def-dbg-val.ll
@@ -0,0 +1,51 @@
+; RUN: opt -hotcoldsplit -hotcoldsplit-threshold=0 -S < %s | FileCheck %s
+
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx10.14.0"
+
+; CHECK-LABEL: define {{.*}}@foo(
+; CHECK-NOT: call {{.*}}llvm.dbg.value
+
+; CHECK-LABEL: define {{.*}}@foo.cold
+; CHECK-NOT: call {{.*}}llvm.dbg.value
+
+define void @foo() !dbg !6 {
+entry:
+  br i1 undef, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry
+  br label %cleanup
+
+if.end:                                           ; preds = %entry
+  ; We expect this block to be outlined. That kills the definition of %var.
+  %var = add i32 0, 0, !dbg !11
+  call void @sink()
+  br label %cleanup
+
+cleanup:
+  ; This dbg.value should be deleted after outlining, otherwise the verifier
+  ; complains about function-local metadata being used outside of a function.
+  call void @llvm.dbg.value(metadata i32 %var, metadata !9, metadata !DIExpression()), !dbg !11
+  ret void
+}
+
+declare void @llvm.dbg.value(metadata, metadata, metadata)
+
+declare void @sink() cold
+
+!llvm.dbg.cu = !{!0}
+!llvm.debugify = !{!3, !4}
+!llvm.module.flags = !{!5}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C, file: !1, producer: "debugify", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
+!1 = !DIFile(filename: "<stdin>", directory: "/")
+!2 = !{}
+!3 = !{i32 7}
+!4 = !{i32 1}
+!5 = !{i32 2, !"Debug Info Version", i32 3}
+!6 = distinct !DISubprogram(name: "foo", linkageName: "foo", scope: null, file: !1, line: 1, type: !7, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: true, unit: !0, retainedNodes: !8)
+!7 = !DISubroutineType(types: !2)
+!8 = !{!9}
+!9 = !DILocalVariable(name: "1", scope: !6, file: !1, line: 1, type: !10)
+!10 = !DIBasicType(name: "ty32", size: 32, encoding: DW_ATE_unsigned)
+!11 = !DILocation(line: 1, column: 1, scope: !6)