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1; RUN: opt -S -loop-reduce %s | FileCheck %s2; REQUIRES: x86-registered-target3 4;; Ensure that SCEV-based salvaging in Loop Strength Reduction can salvage5;; variadic dbg.value intrinsics. Generated from the following C++:6 7;; clang -S -emit-llvm -Xclang -disable-llvm-passes -g lsr-variadic.cpp -o8;; Then running 'opt -O2' up until LSR.9;; void mul_to_addition(unsigned k, unsigned l, unsigned m, unsigned size, unsigned *data) {10;; unsigned i = 0;11;; #pragma clang loop vectorize(disable)12;; while (i < size) {13;; unsigned comp = (4 * i) + k;14;; unsigned comp2 = comp * l;15;; unsigned comp3 = comp2 << m;16;; data[i] = comp;17;; i++;18;; }19;; }20;; This produces variadic dbg.value intrinsics with location op DIArglists 21;; of length two and three.22;; A fourth dbg.value was added artificially by copying a generated dbg.value23;; and the modifying the position of the optimised-out value in the location24;; list.25 26; CHECK: #dbg_value(!DIArgList(i64 %lsr.iv, i32 %k), ![[comp:[0-9]+]], !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_consts, 4, DW_OP_div, DW_OP_consts, 4, DW_OP_mul, DW_OP_LLVM_arg, 1, DW_OP_plus, DW_OP_stack_value),27; CHECK: #dbg_value(!DIArgList(i64 %lsr.iv, i32 %l, i32 %k), ![[comp2:[0-9]+]], !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_consts, 4, DW_OP_div, DW_OP_consts, 4, DW_OP_mul, DW_OP_LLVM_arg, 2, DW_OP_plus, DW_OP_LLVM_arg, 1, DW_OP_mul, DW_OP_stack_value),28; CHECK: #dbg_value(!DIArgList(i64 %lsr.iv, i32 %m, i32 %l, i32 %k), ![[comp3:[0-9]+]], !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_consts, 4, DW_OP_div, DW_OP_consts, 4, DW_OP_mul, DW_OP_LLVM_arg, 3, DW_OP_plus, DW_OP_LLVM_arg, 2, DW_OP_mul, DW_OP_LLVM_arg, 1, DW_OP_shl, DW_OP_stack_value),29; CHECK: #dbg_value(!DIArgList(i64 %lsr.iv, i32 %m, i32 %l, i32 %k), ![[comp3:[0-9]+]], !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_consts, 4, DW_OP_div, DW_OP_consts, 4, DW_OP_mul, DW_OP_LLVM_arg, 3, DW_OP_plus, DW_OP_LLVM_arg, 2, DW_OP_mul, DW_OP_LLVM_arg, 1, DW_OP_shl, DW_OP_stack_value),30; CHECK: ![[comp]] = !DILocalVariable(name: "comp"31; CHECK: ![[comp2]] = !DILocalVariable(name: "comp2"32; CHECK: ![[comp3]] = !DILocalVariable(name: "comp3"33 34 35target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"36target triple = "x86_64-unknown-linux-gnu"37 38define dso_local void @_Z15mul_to_additionjjjjPj(i32 %k, i32 %l, i32 %m, i32 %size, ptr nocapture %data) local_unnamed_addr #0 !dbg !7 {39entry:40 call void @llvm.dbg.value(metadata i32 %k, metadata !14, metadata !DIExpression()), !dbg !2441 call void @llvm.dbg.value(metadata i32 %l, metadata !15, metadata !DIExpression()), !dbg !2442 call void @llvm.dbg.value(metadata i32 %m, metadata !16, metadata !DIExpression()), !dbg !2443 call void @llvm.dbg.value(metadata i32 %size, metadata !17, metadata !DIExpression()), !dbg !2444 call void @llvm.dbg.value(metadata ptr %data, metadata !18, metadata !DIExpression()), !dbg !2445 call void @llvm.dbg.value(metadata i32 0, metadata !19, metadata !DIExpression()), !dbg !2446 %cmp9.not = icmp eq i32 %size, 0, !dbg !2547 br i1 %cmp9.not, label %while.end, label %while.body.preheader, !dbg !2648 49while.body.preheader: ; preds = %entry50 %wide.trip.count = zext i32 %size to i64, !dbg !2551 br label %while.body, !dbg !2652 53while.body: ; preds = %while.body, %while.body.preheader54 %indvars.iv = phi i64 [ 0, %while.body.preheader ], [ %indvars.iv.next, %while.body ]55 call void @llvm.dbg.value(metadata i64 %indvars.iv, metadata !19, metadata !DIExpression()), !dbg !2456 %0 = trunc i64 %indvars.iv to i32, !dbg !2757 %mul = shl i32 %0, 2, !dbg !2758 %add = add i32 %mul, %k, !dbg !2859 call void @llvm.dbg.value(metadata i32 %add, metadata !20, metadata !DIExpression()), !dbg !2960 call void @llvm.dbg.value(metadata !DIArgList(i32 %add, i32 %l), metadata !22, metadata !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 1, DW_OP_mul, DW_OP_stack_value)), !dbg !2961 call void @llvm.dbg.value(metadata !DIArgList(i32 %add, i32 %m, i32 %l), metadata !23, metadata !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 2, DW_OP_mul, DW_OP_LLVM_arg, 1, DW_OP_shl, DW_OP_stack_value)), !dbg !2962 call void @llvm.dbg.value(metadata !DIArgList(i32 %m, i32 %add, i32 %l), metadata !23, metadata !DIExpression(DW_OP_LLVM_arg, 1, DW_OP_LLVM_arg, 2, DW_OP_mul, DW_OP_LLVM_arg, 0, DW_OP_shl, DW_OP_stack_value)), !dbg !2963 %arrayidx = getelementptr inbounds i32, ptr %data, i64 %indvars.iv, !dbg !3064 store i32 %add, ptr %arrayidx, align 4, !dbg !3165 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1, !dbg !3266 call void @llvm.dbg.value(metadata i64 %indvars.iv.next, metadata !19, metadata !DIExpression()), !dbg !2467 %exitcond = icmp ne i64 %indvars.iv.next, %wide.trip.count, !dbg !2568 br i1 %exitcond, label %while.body, label %while.end.loopexit, !dbg !26, !llvm.loop !3369 70while.end.loopexit: ; preds = %while.body71 br label %while.end, !dbg !3772 73while.end: ; preds = %while.end.loopexit, %entry74 ret void, !dbg !3775}76 77; Function Attrs: nofree nosync nounwind readnone speculatable willreturn78declare void @llvm.dbg.value(metadata, metadata, metadata)79 80attributes #0 = { "target-cpu"="x86-64" }81 82 83!llvm.dbg.cu = !{!0}84!llvm.module.flags = !{!2, !3, !4, !5}85!llvm.ident = !{!6}86 87!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 14.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)88!1 = !DIFile(filename: "variadic2.cpp", directory: "/test")89!2 = !{i32 7, !"Dwarf Version", i32 4}90!3 = !{i32 2, !"Debug Info Version", i32 3}91!4 = !{i32 1, !"wchar_size", i32 4}92!5 = !{i32 7, !"uwtable", i32 1}93!6 = !{!"clang version 14.0.0"}94!7 = distinct !DISubprogram(name: "mul_to_addition", linkageName: "_Z15mul_to_additionjjjjPj", scope: !8, file: !8, line: 1, type: !9, scopeLine: 1, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !13)95!8 = !DIFile(filename: "./variadic2.cpp", directory: "/test")96!9 = !DISubroutineType(types: !10)97!10 = !{null, !11, !11, !11, !11, !12}98!11 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)99!12 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !11, size: 64)100!13 = !{!14, !15, !16, !17, !18, !19, !20, !22, !23}101!14 = !DILocalVariable(name: "k", arg: 1, scope: !7, file: !8, line: 1, type: !11)102!15 = !DILocalVariable(name: "l", arg: 2, scope: !7, file: !8, line: 1, type: !11)103!16 = !DILocalVariable(name: "m", arg: 3, scope: !7, file: !8, line: 1, type: !11)104!17 = !DILocalVariable(name: "size", arg: 4, scope: !7, file: !8, line: 1, type: !11)105!18 = !DILocalVariable(name: "data", arg: 5, scope: !7, file: !8, line: 1, type: !12)106!19 = !DILocalVariable(name: "i", scope: !7, file: !8, line: 2, type: !11)107!20 = !DILocalVariable(name: "comp", scope: !21, file: !8, line: 5, type: !11)108!21 = distinct !DILexicalBlock(scope: !7, file: !8, line: 4, column: 23)109!22 = !DILocalVariable(name: "comp2", scope: !21, file: !8, line: 6, type: !11)110!23 = !DILocalVariable(name: "comp3", scope: !21, file: !8, line: 7, type: !11)111!24 = !DILocation(line: 0, scope: !7)112!25 = !DILocation(line: 4, column: 15, scope: !7)113!26 = !DILocation(line: 4, column: 6, scope: !7)114!27 = !DILocation(line: 5, column: 29, scope: !21)115!28 = !DILocation(line: 5, column: 34, scope: !21)116!29 = !DILocation(line: 0, scope: !21)117!30 = !DILocation(line: 8, column: 10, scope: !21)118!31 = !DILocation(line: 8, column: 18, scope: !21)119!32 = !DILocation(line: 9, column: 11, scope: !21)120!33 = distinct !{!33, !26, !34, !35, !36}121!34 = !DILocation(line: 10, column: 6, scope: !7)122!35 = !{!"llvm.loop.mustprogress"}123!36 = !{!"llvm.loop.vectorize.width", i32 1}124!37 = !DILocation(line: 11, column: 2, scope: !7)125