1; RUN: llc -start-after=codegenprepare -stop-before finalize-isel -o - %s | FileCheck %s
2
3; This is a reproducer based on the test case from PR37321.
4
5; We verify that the fragment for the last DBG_VALUE is limited depending
6; on the size of the original fragment (and that we do not emit more
7; DBG_VALUE instructions than needed in case we cover the whole original
8; fragment with just a few DBG_VALUE instructions).
9
10; CHECK-LABEL: bb.{{.*}}.if.end36:
11; CHECK:      [[REG1:%[0-9]+]]:gr32 = PHI
12; CHECK-NEXT: [[REG2:%[0-9]+]]:gr32 = PHI
13; CHECK-NEXT: [[REG3:%[0-9]+]]:gr32 = PHI
14; CHECK-NEXT: DBG_VALUE [[REG1]], $noreg, !13, !DIExpression(DW_OP_LLVM_fragment, 0, 32)
15; CHECK-NEXT: DBG_VALUE [[REG2]], $noreg, !13, !DIExpression(DW_OP_LLVM_fragment, 32, 32)
16; CHECK-NEXT: DBG_VALUE [[REG3]], $noreg, !13, !DIExpression(DW_OP_LLVM_fragment, 64, 16)
17; CHECK-NEXT: DBG_VALUE [[REG1]], $noreg, !12, !DIExpression(DW_OP_LLVM_fragment, 10, 32)
18; CHECK-NEXT: DBG_VALUE [[REG2]], $noreg, !12, !DIExpression(DW_OP_LLVM_fragment, 42, 13)
19; CHECK-NOT:  DBG_VALUE
20
21target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
22target triple = "i686-w64-windows-gnu"
23
24; Function Attrs: nounwind readnone
25define dso_local i64 @nextafterl(i80 %a) local_unnamed_addr #0 !dbg !6 {
26entry:
27  br i1 undef, label %if.else, label %if.then13, !dbg !28
28
29if.then13:                                        ; preds = %entry
30  %u.sroa.0.8.insert.insert = or i80 %a, 2222, !dbg !29
31  br label %if.end36, !dbg !33
32
33if.else:                                          ; preds = %entry
34  br label %if.end36
35
36if.end36:                                         ; preds = %if.else, %if.then13
37  %u.sroa.0.1.in = phi i80 [ %u.sroa.0.8.insert.insert, %if.then13 ], [ 1234567, %if.else ]
38  call void @llvm.dbg.value(metadata i80 %u.sroa.0.1.in, metadata !13, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 80)), !dbg !34
39  call void @llvm.dbg.value(metadata i80 %u.sroa.0.1.in, metadata !12, metadata !DIExpression(DW_OP_LLVM_fragment, 10, 45)), !dbg !34
40  %u.sroa.0.0.extract.ashr = ashr i80 %u.sroa.0.1.in, 8, !dbg !35
41  %u.sroa.0.0.extract.trunc = trunc i80 %u.sroa.0.0.extract.ashr to i64, !dbg !35
42  ret i64 %u.sroa.0.0.extract.trunc
43}
44
45; Function Attrs: nounwind readnone speculatable
46declare void @llvm.dbg.value(metadata, metadata, metadata) #1
47
48attributes #0 = { nounwind readnone }
49attributes #1 = { nounwind readnone speculatable }
50
51!llvm.dbg.cu = !{!0}
52!llvm.module.flags = !{!26, !27}
53
54!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 7.0.0 (trunk 330808) (llvm/trunk 330813)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !3)
55!1 = !DIFile(filename: "pr37321.c", directory: "")
56!2 = !{}
57!3 = !{!4}
58!4 = !DIGlobalVariableExpression(var: !5, expr: !DIExpression())
59!5 = distinct !DIGlobalVariable(name: "normal_bit", scope: !6, file: !1, line: 31, type: !25, isLocal: true, isDefinition: true)
60!6 = distinct !DISubprogram(name: "nextafterl", scope: !1, file: !1, line: 17, type: !7, isLocal: false, isDefinition: true, scopeLine: 18, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !10)
61!7 = !DISubroutineType(types: !8)
62!8 = !{!9, !9, !9}
63!9 = !DIBasicType(name: "long double", size: 96, encoding: DW_ATE_float)
64!10 = !{!11, !12, !13}
65!11 = !DILocalVariable(name: "x", arg: 1, scope: !6, file: !1, line: 17, type: !9)
66!12 = !DILocalVariable(name: "y", arg: 2, scope: !6, file: !1, line: 17, type: !9)
67!13 = !DILocalVariable(name: "u", scope: !6, file: !1, line: 27, type: !14)
68!14 = distinct !DICompositeType(tag: DW_TAG_union_type, scope: !6, file: !1, line: 19, size: 128, elements: !15)
69!15 = !{!16, !17}
70!16 = !DIDerivedType(tag: DW_TAG_member, name: "ld", scope: !14, file: !1, line: 20, baseType: !9, size: 96)
71!17 = !DIDerivedType(tag: DW_TAG_member, name: "parts", scope: !14, file: !1, line: 26, baseType: !18, size: 128)
72!18 = distinct !DICompositeType(tag: DW_TAG_structure_type, scope: !14, file: !1, line: 21, size: 128, elements: !19)
73!19 = !{!20, !22, !24}
74!20 = !DIDerivedType(tag: DW_TAG_member, name: "mantissa", scope: !18, file: !1, line: 23, baseType: !21, size: 64)
75!21 = !DIBasicType(name: "long long unsigned int", size: 64, encoding: DW_ATE_unsigned)
76!22 = !DIDerivedType(tag: DW_TAG_member, name: "expn", scope: !18, file: !1, line: 24, baseType: !23, size: 16, offset: 64)
77!23 = !DIBasicType(name: "unsigned short", size: 16, encoding: DW_ATE_unsigned)
78!24 = !DIDerivedType(tag: DW_TAG_member, name: "pad", scope: !18, file: !1, line: 25, baseType: !23, size: 16, offset: 80)
79!25 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !21)
80!26 = !{i32 2, !"Debug Info Version", i32 3}
81!27 = !{i32 1, !"wchar_size", i32 2}
82!28 = !DILocation(line: 47, column: 7, scope: !6)
83!29 = !DILocation(line: 51, column: 14, scope: !30)
84!30 = distinct !DILexicalBlock(scope: !31, file: !1, line: 50, column: 11)
85!31 = distinct !DILexicalBlock(scope: !32, file: !1, line: 48, column: 5)
86!32 = distinct !DILexicalBlock(scope: !6, file: !1, line: 47, column: 7)
87!33 = !DILocation(line: 51, column: 2, scope: !30)
88!34 = !DILocation(line: 27, column: 5, scope: !6)
89!35 = !DILocation(line: 63, column: 22, scope: !36)
90!36 = distinct !DILexicalBlock(scope: !6, file: !1, line: 62, column: 7)
91