1; RUN: llc -start-before=codegenprepare -stop-after=codegenprepare -mtriple=x86_64-unknown-unknown %s -o - | FileCheck %s
2;
3; CGP duplicates address calculation into each basic block that contains loads
4; or stores, so that they can be folded into instruction memory operands for
5; example. dbg.value's should be redirected to identify such local address
6; computations, to give the best opportunity for variable locations to be
7; preserved.
8; This test has two dbg.values in it, one before and one after the relevant
9; memory instruction. Test that the one before does _not_ get updated (as that
10; would either make it use-before-def or shift when the variable appears), and
11; that the dbg.value after the memory instruction does get updated.
12
13define dso_local i8 @foo(i32 *%p, i32 %cond) !dbg !7 {
14entry:
15; There should be no dbg.values in this block.
16; CHECK-LABEL: entry:
17; CHECK-NOT:   dbg.value
18  %casted = bitcast i32 *%p to i8*
19  %arith = getelementptr i8, i8 *%casted, i32 3
20  %load1 = load i8, i8 *%arith
21  %cmpresult = icmp eq i32 %cond, 0
22  br i1 %cmpresult, label %next, label %ret
23
24next:
25; Address calcs should be duplicated into this block. One dbg.value should be
26; updated, and the other should not.
27; CHECK-LABEL: next:
28; CHECK:       dbg.value(metadata i8* %arith, metadata ![[DIVAR:[0-9]+]],
29; CHECK-SAME:    metadata !DIExpression()
30; CHECK-NEXT:  %[[CASTVAR:[0-9a-zA-Z]+]] = bitcast i32* %p to i8*
31; CHECK-NEXT:  %[[GEPVAR:[0-9a-zA-Z]+]] = getelementptr i8, i8* %[[CASTVAR]],
32; CHECK-SAME:                             i64 3
33; CHECK-NEXT:  %loaded = load i8, i8* %[[GEPVAR]]
34; CHECK-NEXT:  call void @llvm.dbg.value(metadata i8* %[[GEPVAR]],
35; CHECK-SAME:                            metadata ![[DIVAR]],
36  call void @llvm.dbg.value(metadata i8 *%arith, metadata !12, metadata !DIExpression()), !dbg !14
37  %loaded = load i8, i8 *%arith
38  call void @llvm.dbg.value(metadata i8 *%arith, metadata !12, metadata !DIExpression()), !dbg !14
39  ret i8 %loaded
40
41ret:
42  ret i8 0
43}
44
45; CHECK: ![[DIVAR]] = !DILocalVariable(name: "p",
46
47declare void @llvm.dbg.value(metadata, metadata, metadata)
48
49!llvm.dbg.cu = !{!0}
50!llvm.module.flags = !{!3, !4, !5}
51!llvm.ident = !{!6}
52
53!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
54!1 = !DIFile(filename: "test.cpp", directory: ".")
55!2 = !{}
56!3 = !{i32 2, !"Dwarf Version", i32 4}
57!4 = !{i32 2, !"Debug Info Version", i32 3}
58!5 = !{i32 1, !"wchar_size", i32 4}
59!6 = !{!"clang version 8.0.0 (trunk 348209)"}
60!7 = distinct !DISubprogram(name: "foo", linkageName: "foo", scope: !1, file: !1, line: 4, type: !8, scopeLine: 5, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11)
61!8 = !DISubroutineType(types: !9)
62!9 = !{null, !10}
63!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
64!11 = !{!12}
65!12 = !DILocalVariable(name: "p", arg: 1, scope: !7, file: !1, line: 4, type: !10)
66!14 = !DILocation(line: 4, column: 15, scope: !7)
67!20 = distinct !DILexicalBlock(scope: !7, file: !1, line: 8, column: 7)
68