1 ; RUN: opt -loop-reduce -S %s | FileCheck %s
2 ; RUN: opt --try-experimental-debuginfo-iterators -loop-reduce -S %s | FileCheck %s
4 ;; Test that LSR preserves debug-info for induction variables and scev-based
5 ;; salvaging produces short DIExpressions that use a constant offset from the
8 target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
10 define dso_local void @foo(ptr nocapture %p) local_unnamed_addr !dbg !7 {
13 call void @llvm.dbg.value(metadata ptr %p, metadata !13, metadata !DIExpression()), !dbg !16
14 call void @llvm.dbg.value(metadata i8 0, metadata !14, metadata !DIExpression()), !dbg !17
15 br label %for.body, !dbg !18
17 for.cond.cleanup: ; preds = %for.body
20 for.body: ; preds = %entry, %for.body
21 ; CHECK-LABEL: for.body:
22 %i.06 = phi i8 [ 0, %entry ], [ %inc, %for.body ]
23 %p.addr.05 = phi ptr [ %p, %entry ], [ %add.ptr, %for.body ]
24 call void @llvm.dbg.value(metadata i8 %i.06, metadata !14, metadata !DIExpression()), !dbg !17
25 call void @llvm.dbg.value(metadata ptr %p.addr.05, metadata !13, metadata !DIExpression()), !dbg !16
26 ; CHECK-NOT: #dbg_value(ptr undef
27 ; CHECK: #dbg_value(ptr %lsr.iv, ![[MID_p:[0-9]+]], !DIExpression(DW_OP_constu, 3, DW_OP_minus, DW_OP_stack_value),
28 %add.ptr = getelementptr inbounds i8, ptr %p.addr.05, i64 3, !dbg !20
29 call void @llvm.dbg.value(metadata ptr %add.ptr, metadata !13, metadata !DIExpression()), !dbg !16
30 ; CHECK-NOT: #dbg_value(ptr undef
31 ; CHECK: #dbg_value(ptr %lsr.iv, ![[MID_p]], !DIExpression(),
32 store i8 %i.06, ptr %add.ptr, align 1, !dbg !23, !tbaa !24
33 %inc = add nuw nsw i8 %i.06, 1, !dbg !27
34 call void @llvm.dbg.value(metadata i8 %inc, metadata !14, metadata !DIExpression()), !dbg !17
35 %exitcond.not = icmp eq i8 %inc, 32, !dbg !28
36 br i1 %exitcond.not, label %for.cond.cleanup, label %for.body, !dbg !18, !llvm.loop !29
39 declare void @llvm.dbg.value(metadata, metadata, metadata)
42 !llvm.module.flags = !{!3, !4, !5}
45 !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 12.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
46 !1 = !DIFile(filename: "lsrdbg.c", directory: "/")
48 !3 = !{i32 7, !"Dwarf Version", i32 4}
49 !4 = !{i32 2, !"Debug Info Version", i32 3}
50 !5 = !{i32 1, !"wchar_size", i32 4}
51 !6 = !{!"clang version 12.0.0"}
52 !7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 2, type: !8, scopeLine: 2, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !12)
53 !8 = !DISubroutineType(types: !9)
55 !10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !11, size: 64)
56 !11 = !DIBasicType(name: "unsigned char", size: 8, encoding: DW_ATE_unsigned_char)
58 !13 = !DILocalVariable(name: "p", arg: 1, scope: !7, file: !1, line: 2, type: !10)
59 ; CHECK: ![[MID_p]] = !DILocalVariable(name: "p", arg: 1, scope: !7, file: !1, line: 2, type: !10)
60 !14 = !DILocalVariable(name: "i", scope: !15, file: !1, line: 4, type: !11)
61 !15 = distinct !DILexicalBlock(scope: !7, file: !1, line: 4, column: 3)
62 !16 = !DILocation(line: 0, scope: !7)
63 !17 = !DILocation(line: 0, scope: !15)
64 !18 = !DILocation(line: 4, column: 3, scope: !15)
65 !19 = !DILocation(line: 8, column: 1, scope: !7)
66 !20 = !DILocation(line: 5, column: 7, scope: !21)
67 !21 = distinct !DILexicalBlock(scope: !22, file: !1, line: 4, column: 42)
68 !22 = distinct !DILexicalBlock(scope: !15, file: !1, line: 4, column: 3)
69 !23 = !DILocation(line: 6, column: 8, scope: !21)
70 !24 = !{!25, !25, i64 0}
71 !25 = !{!"omnipotent char", !26, i64 0}
72 !26 = !{!"Simple C/C++ TBAA"}
73 !27 = !DILocation(line: 4, column: 38, scope: !22)
74 !28 = !DILocation(line: 4, column: 31, scope: !22)
75 !29 = distinct !{!29, !18, !30, !31}
76 !30 = !DILocation(line: 7, column: 3, scope: !15)
77 !31 = !{!"llvm.loop.unroll.disable"}