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Differential D58403 Diff 232525 llvm/test/DebugInfo/Generic/codegenprep-addrsink.ll

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llvm/test/DebugInfo/Generic/codegenprep-addrsink.ll

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1​; RUN: llc -start-before=codegenprepare -stop-after=codegenprepare %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​;
13​; Due to placeDbgValues, the dbg.values currently get shifted up a few
14​; instructions.
15​
16​define dso_local i8 @foo(i32 *%p, i32 %cond) !dbg !7 {
17​entry:
18​; The first dbg.value of %arith, in the 'next' block, will be moved up here
19​; by placeDbgValues,
20​; CHECK-LABEL: entry:
21​; CHECK: dbg.value(metadata i8* %arith, metadata ![[DIVAR:[0-9]+]],
22​; CHECK-SAME: metadata !DIExpression()
23​ %casted = bitcast i32 *%p to i8*
24​ %arith = getelementptr i8, i8 *%casted, i32 3
25​ %load1 = load i8, i8 *%arith
26​ %cmpresult = icmp eq i32 %cond, 0
27​ br i1 %cmpresult, label %next, label %ret
28​
29​next:
30​; Address calcs should be duplicated into this block. One dbg.value should be
31​; updated, and the other should not.
32​; CHECK-LABEL: next:
33​; CHECK: %[[CASTVAR:[0-9a-zA-Z]+]] = bitcast i32* %p to i8*
34​; CHECK-NEXT: %[[GEPVAR:[0-9a-zA-Z]+]] = getelementptr i8, i8* %[[CASTVAR]],
35​; CHECK-SAME: i64 3
36​; CHECK-NEXT: call void @llvm.dbg.value(metadata i8* %[[GEPVAR]],
37​; CHECK-SAME: metadata ![[DIVAR]],
38​; CHECK-NEXT: %loaded = load i8, i8* %[[GEPVAR]]
39​ call void @llvm.dbg.value(metadata i8 *%arith, metadata !12, metadata !DIExpression()), !dbg !14
40​ %loaded = load i8, i8 *%arith
41​ call void @llvm.dbg.value(metadata i8 *%arith, metadata !12, metadata !DIExpression()), !dbg !14
42​ ret i8 %loaded
43​
44​ret:
45​ ret i8 0
46​}
47​
48​; CHECK: ![[DIVAR]] = !DILocalVariable(name: "p",
49​
50​declare void @llvm.dbg.value(metadata, metadata, metadata)
51​
52​!llvm.dbg.cu = !{!0}
53​!llvm.module.flags = !{!3, !4, !5}
54​!llvm.ident = !{!6}
55​
56​!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
57​!1 = !DIFile(filename: "test.cpp", directory: ".")
58​!2 = !{}
59​!3 = !{i32 2, !"Dwarf Version", i32 4}
60​!4 = !{i32 2, !"Debug Info Version", i32 3}
61​!5 = !{i32 1, !"wchar_size", i32 4}
62​!6 = !{!"clang version 8.0.0 (trunk 348209)"}
63​!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)
64​!8 = !DISubroutineType(types: !9)
65​!9 = !{null, !10}
66​!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
67​!11 = !{!12}
68​!12 = !DILocalVariable(name: "p", arg: 1, scope: !7, file: !1, line: 4, type: !10)
69​!14 = !DILocation(line: 4, column: 15, scope: !7)
70​!20 = distinct !DILexicalBlock(scope: !7, file: !1, line: 8, column: 7)