--- /dev/null
+# RUN: llc -O1 -filetype=asm -mtriple x86_64-unknown-linux-gnu -mcpu=x86-64 -o - %s -start-before=simple-register-coalescing -stop-after=simple-register-coalescing | FileCheck %s
+
+--- |
+ target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+ target triple = "x86_64-unknown-linux-gnu"
+
+ define i32 @main() local_unnamed_addr !dbg !14 {
+ entry:
+ %shl = shl i32 undef, undef, !dbg !19
+ tail call void @llvm.dbg.value(metadata i32 %shl, metadata !18, metadata !DIExpression()), !dbg !20
+ ret i32 %shl, !dbg !21
+ }
+
+ declare void @llvm.dbg.value(metadata, metadata, metadata)
+
+ !llvm.dbg.cu = !{!0}
+ !llvm.module.flags = !{!12, !13}
+
+ !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !2)
+ !1 = !DIFile(filename: "bar.c", directory: "")
+ !2 = !{}
+ !7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+ !12 = !{i32 2, !"Debug Info Version", i32 3}
+ !13 = !{i32 1, !"wchar_size", i32 4}
+ !14 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 12, type: !15, isLocal: false, isDefinition: true, scopeLine: 12, isOptimized: true, unit: !0, variables: !17)
+ !15 = !DISubroutineType(types: !16)
+ !16 = !{!7}
+ !17 = !{!18}
+ !18 = !DILocalVariable(name: "bazinga", scope: !14, file: !1, line: 13, type: !7)
+ !19 = !DILocation(line: 14, column: 11, scope: !14)
+ !20 = !DILocation(line: 13, column: 7, scope: !14)
+ !21 = !DILocation(line: 16, column: 3, scope: !14)
+
+...
+---
+name: main
+alignment: 4
+registers:
+ - { id: 0, class: gr32, preferred-register: '' }
+body: |
+ bb.0.entry:
+ %0 = MOV32r0 implicit-def dead %eflags, debug-location !19
+ DBG_VALUE debug-use %0, debug-use _, !18, !DIExpression(), debug-location !20
+ %eax = COPY killed %0, debug-location !21
+ RET 0, killed %eax, debug-location !21
+
+...
+
+# CHECK: %eax = MOV32r0
+# CHECK-NEXT: DBG_VALUE debug-use %eax