1 ; RUN: opt -loop-reduce -S %s | FileCheck %s
3 ;; Test that LSR preserves debug-info for induction variables and scev-based
4 ;; salvaging produces short DIExpressions that use a constant offset from the
7 target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
9 define dso_local void @foo(ptr nocapture %p) local_unnamed_addr !dbg !7 {
12 call void @llvm.dbg.value(metadata ptr %p, metadata !13, metadata !DIExpression()), !dbg !16
13 call void @llvm.dbg.value(metadata i8 0, metadata !14, metadata !DIExpression()), !dbg !17
14 br label %for.body, !dbg !18
16 for.cond.cleanup: ; preds = %for.body
19 for.body: ; preds = %entry, %for.body
20 ; CHECK-LABEL: for.body:
21 %i.06 = phi i8 [ 0, %entry ], [ %inc, %for.body ]
22 %p.addr.05 = phi ptr [ %p, %entry ], [ %add.ptr, %for.body ]
23 call void @llvm.dbg.value(metadata i8 %i.06, metadata !14, metadata !DIExpression()), !dbg !17
24 call void @llvm.dbg.value(metadata ptr %p.addr.05, metadata !13, metadata !DIExpression()), !dbg !16
25 ; CHECK-NOT: call void @llvm.dbg.value(metadata ptr undef
26 ; CHECK: all void @llvm.dbg.value(metadata ptr %lsr.iv, metadata ![[MID_p:[0-9]+]], metadata !DIExpression(DW_OP_constu, 3, DW_OP_minus, DW_OP_stack_value))
27 %add.ptr = getelementptr inbounds i8, ptr %p.addr.05, i64 3, !dbg !20
28 call void @llvm.dbg.value(metadata ptr %add.ptr, metadata !13, metadata !DIExpression()), !dbg !16
29 ; CHECK-NOT: call void @llvm.dbg.value(metadata ptr undef
30 ; CHECK: call void @llvm.dbg.value(metadata ptr %lsr.iv, metadata ![[MID_p]], metadata !DIExpression())
31 store i8 %i.06, ptr %add.ptr, align 1, !dbg !23, !tbaa !24
32 %inc = add nuw nsw i8 %i.06, 1, !dbg !27
33 call void @llvm.dbg.value(metadata i8 %inc, metadata !14, metadata !DIExpression()), !dbg !17
34 %exitcond.not = icmp eq i8 %inc, 32, !dbg !28
35 br i1 %exitcond.not, label %for.cond.cleanup, label %for.body, !dbg !18, !llvm.loop !29
38 declare void @llvm.dbg.value(metadata, metadata, metadata)
41 !llvm.module.flags = !{!3, !4, !5}
44 !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)
45 !1 = !DIFile(filename: "lsrdbg.c", directory: "/")
47 !3 = !{i32 7, !"Dwarf Version", i32 4}
48 !4 = !{i32 2, !"Debug Info Version", i32 3}
49 !5 = !{i32 1, !"wchar_size", i32 4}
50 !6 = !{!"clang version 12.0.0"}
51 !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)
52 !8 = !DISubroutineType(types: !9)
54 !10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !11, size: 64)
55 !11 = !DIBasicType(name: "unsigned char", size: 8, encoding: DW_ATE_unsigned_char)
57 !13 = !DILocalVariable(name: "p", arg: 1, scope: !7, file: !1, line: 2, type: !10)
58 ; CHECK: ![[MID_p]] = !DILocalVariable(name: "p", arg: 1, scope: !7, file: !1, line: 2, type: !10)
59 !14 = !DILocalVariable(name: "i", scope: !15, file: !1, line: 4, type: !11)
60 !15 = distinct !DILexicalBlock(scope: !7, file: !1, line: 4, column: 3)
61 !16 = !DILocation(line: 0, scope: !7)
62 !17 = !DILocation(line: 0, scope: !15)
63 !18 = !DILocation(line: 4, column: 3, scope: !15)
64 !19 = !DILocation(line: 8, column: 1, scope: !7)
65 !20 = !DILocation(line: 5, column: 7, scope: !21)
66 !21 = distinct !DILexicalBlock(scope: !22, file: !1, line: 4, column: 42)
67 !22 = distinct !DILexicalBlock(scope: !15, file: !1, line: 4, column: 3)
68 !23 = !DILocation(line: 6, column: 8, scope: !21)
69 !24 = !{!25, !25, i64 0}
70 !25 = !{!"omnipotent char", !26, i64 0}
71 !26 = !{!"Simple C/C++ TBAA"}
72 !27 = !DILocation(line: 4, column: 38, scope: !22)
73 !28 = !DILocation(line: 4, column: 31, scope: !22)
74 !29 = distinct !{!29, !18, !30, !31}
75 !30 = !DILocation(line: 7, column: 3, scope: !15)
76 !31 = !{!"llvm.loop.unroll.disable"}