1; RUN: opt -S -loop-reduce %s -o - | FileCheck %s 2; RUN: opt --try-experimental-debuginfo-iterators -S -loop-reduce %s -o - | FileCheck %s 3; REQUIRES: x86-registered-target 4 5;; Ensure that we retain debuginfo for the induction variable and dependant 6;; variables when loop strength reduction is applied to the loop. 7;; This IR produced from: 8;; 9;; clang -S -emit-llvm -Xclang -disable-llvm-passes -g lsr-basic.cpp -o 10;; Then executing opt -O2 up to the the loopFullUnroll pass. 11;; void mul_to_addition(unsigned k, unsigned size, unsigned *data) { 12;; int i = 0; 13;; #pragma clang loop vectorize(disable) 14;; while (i < size) { 15;; int comp = (4 * i) + k; 16;; data[i] = comp; 17;; i += 1; 18;; } 19;; } 20; CHECK: #dbg_value(i64 %lsr.iv, ![[i:[0-9]+]], !DIExpression(), 21; CHECK: #dbg_value(!DIArgList(i64 %lsr.iv, i32 %k), ![[comp:[0-9]+]], !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_consts, 4, DW_OP_mul, DW_OP_LLVM_arg, 1, DW_OP_plus, DW_OP_stack_value), 22; CHECK: #dbg_value(i64 %lsr.iv, ![[i]], !DIExpression(DW_OP_consts, 1, DW_OP_plus, DW_OP_stack_value), 23; CHECK: ![[i]] = !DILocalVariable(name: "i" 24; CHECK: ![[comp]] = !DILocalVariable(name: "comp" 25 26target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128" 27target triple = "x86_64-unknown-linux-gnu" 28 29define dso_local void @_Z15mul_to_additionjjPj(i32 %k, i32 %size, ptr nocapture %data) local_unnamed_addr !dbg !7 { 30entry: 31 call void @llvm.dbg.value(metadata i32 %k, metadata !13, metadata !DIExpression()), !dbg !14 32 call void @llvm.dbg.value(metadata i32 %size, metadata !15, metadata !DIExpression()), !dbg !14 33 call void @llvm.dbg.value(metadata ptr %data, metadata !16, metadata !DIExpression()), !dbg !14 34 call void @llvm.dbg.value(metadata i32 0, metadata !17, metadata !DIExpression()), !dbg !14 35 br label %while.cond, !dbg !14 36 37while.cond: ; preds = %while.body, %entry 38 %i.0 = phi i32 [ 0, %entry ], [ %add1, %while.body ], !dbg !14 39 call void @llvm.dbg.value(metadata i32 %i.0, metadata !17, metadata !DIExpression()), !dbg !14 40 %cmp = icmp ult i32 %i.0, %size, !dbg !14 41 br i1 %cmp, label %while.body, label %while.end, !dbg !14 42 43while.body: ; preds = %while.cond 44 %mul = mul nsw i32 %i.0, 4, !dbg !19 45 %add = add i32 %mul, %k, !dbg !19 46 call void @llvm.dbg.value(metadata i32 %add, metadata !21, metadata !DIExpression()), !dbg !19 47 %idxprom = zext i32 %i.0 to i64, !dbg !19 48 %arrayidx = getelementptr inbounds i32, ptr %data, i64 %idxprom, !dbg !19 49 store i32 %add, ptr %arrayidx, align 4, !dbg !19 50 %add1 = add nuw nsw i32 %i.0, 1, !dbg !19 51 call void @llvm.dbg.value(metadata i32 %add1, metadata !17, metadata !DIExpression()), !dbg !14 52 br label %while.cond, !dbg !14, !llvm.loop !22 53 54while.end: ; preds = %while.cond 55 ret void, !dbg !14 56} 57 58; Function Attrs: nofree nosync nounwind readnone speculatable willreturn 59declare void @llvm.dbg.value(metadata, metadata, metadata) 60 61!llvm.dbg.cu = !{!0} 62!llvm.module.flags = !{!3, !4, !5} 63!llvm.ident = !{!6} 64 65!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 12.0.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None) 66!1 = !DIFile(filename: "basic.cpp", directory: "/test") 67!2 = !{} 68!3 = !{i32 7, !"Dwarf Version", i32 4} 69!4 = !{i32 2, !"Debug Info Version", i32 3} 70!5 = !{i32 1, !"wchar_size", i32 4} 71!6 = !{!"clang version 12.0.0"} 72!7 = distinct !DISubprogram(name: "mul_to_addition", linkageName: "_Z15mul_to_additionjjPj", scope: !8, file: !8, line: 64, type: !9, scopeLine: 64, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2) 73!8 = !DIFile(filename: "./basic.cpp", directory: "/test") 74!9 = !DISubroutineType(types: !10) 75!10 = !{null, !11, !11, !12} 76!11 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned) 77!12 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !11, size: 64) 78!13 = !DILocalVariable(name: "k", arg: 1, scope: !7, file: !8, line: 64, type: !11) 79!14 = !DILocation(line: 0, scope: !7) 80!15 = !DILocalVariable(name: "size", arg: 2, scope: !7, file: !8, line: 64, type: !11) 81!16 = !DILocalVariable(name: "data", arg: 3, scope: !7, file: !8, line: 64, type: !12) 82!17 = !DILocalVariable(name: "i", scope: !7, file: !8, line: 65, type: !18) 83!18 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 84!19 = !DILocation(line: 68, column: 23, scope: !20) 85!20 = distinct !DILexicalBlock(scope: !7, file: !8, line: 67, column: 22) 86!21 = !DILocalVariable(name: "comp", scope: !20, file: !8, line: 68, type: !18) 87!22 = distinct !{!22, !23, !24, !25, !26} 88!23 = !DILocation(line: 67, column: 5, scope: !7) 89!24 = !DILocation(line: 71, column: 5, scope: !7) 90!25 = !{!"llvm.loop.mustprogress"} 91!26 = !{!"llvm.loop.vectorize.width", i32 1} 92