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1; Confirm that the line number for the do.body.preheader block2; branch is the the start of the loop.3 4; RUN: opt -passes=simplifycfg,loop-simplify -keep-loops="false" -simplifycfg-require-and-preserve-domtree=1 -S <%s | FileCheck %s5 6; CHECK: do.body.preheader:7; CHECK-NEXT: phi8; CHECK-NEXT: phi9; CHECK-NEXT: br label %do.body, !dbg ![[DL:[0-9]+]]10; CHECK: ![[DL]] = !DILocation(line: 4,11 12; This IR can be generated by running:13; clang src.cpp -O2 -g -S -emit-llvm -mllvm -opt-bisect-limit=62 -o -14;15; Where src.cpp contains:16; int foo(char *Bytes, int Count)17; {18; int Total = 0;19; do20; Total += Bytes[--Count];21; while (Count);22; return Total;23; }24 25define dso_local i32 @"foo"(ptr nocapture readonly %Bytes, i32 %Count) local_unnamed_addr !dbg !8 {26entry:27 %0 = sext i32 %Count to i64, !dbg !1028 %min.iters.check = icmp ult i32 %Count, 8, !dbg !1029 br i1 %min.iters.check, label %do.body.preheader, label %vector.ph, !dbg !1030 31vector.ph: ; preds = %entry32 %n.vec = and i64 %0, -8, !dbg !1033 %ind.end = sub nsw i64 %0, %n.vec, !dbg !1034 br label %vector.body, !dbg !1035 36vector.body: ; preds = %vector.body, %vector.ph37 %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]38 %vec.phi = phi <4 x i32> [ zeroinitializer, %vector.ph ], [ %11, %vector.body ]39 %vec.phi5 = phi <4 x i32> [ zeroinitializer, %vector.ph ], [ %12, %vector.body ]40 %1 = xor i64 %index, -1, !dbg !1141 %2 = add i64 %1, %0, !dbg !1142 %3 = getelementptr inbounds i8, ptr %Bytes, i64 %2, !dbg !1143 %4 = getelementptr inbounds i8, ptr %3, i64 -3, !dbg !1144 %5 = bitcast ptr %4 to ptr, !dbg !1145 %wide.load = load <4 x i8>, ptr %5, align 1, !dbg !11, !tbaa !1246 %reverse = shufflevector <4 x i8> %wide.load, <4 x i8> undef, <4 x i32> <i32 3, i32 2, i32 1, i32 0>, !dbg !1147 %6 = getelementptr inbounds i8, ptr %3, i64 -4, !dbg !1148 %7 = getelementptr inbounds i8, ptr %6, i64 -3, !dbg !1149 %8 = bitcast ptr %7 to ptr, !dbg !1150 %wide.load6 = load <4 x i8>, ptr %8, align 1, !dbg !11, !tbaa !1251 %reverse7 = shufflevector <4 x i8> %wide.load6, <4 x i8> undef, <4 x i32> <i32 3, i32 2, i32 1, i32 0>, !dbg !1152 %9 = sext <4 x i8> %reverse to <4 x i32>, !dbg !1153 %10 = sext <4 x i8> %reverse7 to <4 x i32>, !dbg !1154 %11 = add nsw <4 x i32> %vec.phi, %9, !dbg !1155 %12 = add nsw <4 x i32> %vec.phi5, %10, !dbg !1156 %index.next = add i64 %index, 857 %13 = icmp eq i64 %index.next, %n.vec58 br i1 %13, label %middle.block, label %vector.body, !llvm.loop !1559 60middle.block: ; preds = %vector.body61 %.lcssa12 = phi <4 x i32> [ %11, %vector.body ], !dbg !1162 %.lcssa = phi <4 x i32> [ %12, %vector.body ], !dbg !1163 %bin.rdx = add <4 x i32> %.lcssa, %.lcssa12, !dbg !1164 %rdx.shuf = shufflevector <4 x i32> %bin.rdx, <4 x i32> undef, <4 x i32> <i32 2, i32 3, i32 undef, i32 undef>, !dbg !1165 %bin.rdx8 = add <4 x i32> %bin.rdx, %rdx.shuf, !dbg !1166 %rdx.shuf9 = shufflevector <4 x i32> %bin.rdx8, <4 x i32> undef, <4 x i32> <i32 1, i32 undef, i32 undef, i32 undef>, !dbg !1167 %bin.rdx10 = add <4 x i32> %bin.rdx8, %rdx.shuf9, !dbg !1168 %14 = extractelement <4 x i32> %bin.rdx10, i32 0, !dbg !1169 %cmp.n = icmp eq i64 %n.vec, %070 br i1 %cmp.n, label %do.end, label %do.body.preheader, !dbg !1071 72do.body.preheader: ; preds = %middle.block, %entry73 %indvars.iv.ph = phi i64 [ %0, %entry ], [ %ind.end, %middle.block ]74 %Total.0.ph = phi i32 [ 0, %entry ], [ %14, %middle.block ]75 br label %do.body, !dbg !1176 77do.body: ; preds = %do.body.preheader, %do.body78 %indvars.iv = phi i64 [ %indvars.iv.next, %do.body ], [ %indvars.iv.ph, %do.body.preheader ]79 %Total.0 = phi i32 [ %add, %do.body ], [ %Total.0.ph, %do.body.preheader ], !dbg !1880 %indvars.iv.next = add nsw i64 %indvars.iv, -1, !dbg !1181 %arrayidx = getelementptr inbounds i8, ptr %Bytes, i64 %indvars.iv.next, !dbg !1182 %15 = load i8, ptr %arrayidx, align 1, !dbg !11, !tbaa !1283 %conv = sext i8 %15 to i32, !dbg !1184 %add = add nsw i32 %Total.0, %conv, !dbg !1185 %16 = icmp eq i64 %indvars.iv.next, 086 br i1 %16, label %do.end.loopexit, label %do.body, !dbg !11, !llvm.loop !1987 88do.end.loopexit: ; preds = %do.body89 %add.lcssa11 = phi i32 [ %add, %do.body ], !dbg !1190 br label %do.end, !dbg !2191 92do.end: ; preds = %do.end.loopexit, %middle.block93 %add.lcssa = phi i32 [ %14, %middle.block ], [ %add.lcssa11, %do.end.loopexit ], !dbg !1194 ret i32 %add.lcssa, !dbg !2195}96 97!llvm.dbg.cu = !{!0}98!llvm.module.flags = !{!3, !4, !5, !6}99!llvm.ident = !{!7}100 101!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !2, nameTableKind: None)102!1 = !DIFile(filename: "src2.cpp", directory: "")103!2 = !{}104!3 = !{i32 2, !"CodeView", i32 1}105!4 = !{i32 2, !"Debug Info Version", i32 3}106!5 = !{i32 1, !"wchar_size", i32 2}107!6 = !{i32 7, !"PIC Level", i32 2}108!7 = !{!""}109!8 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 1, type: !9, scopeLine: 2, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !2)110!9 = !DISubroutineType(types: !2)111!10 = !DILocation(line: 4, scope: !8)112!11 = !DILocation(line: 5, scope: !8)113!12 = !{!13, !13, i64 0}114!13 = !{!"omnipotent char", !14, i64 0}115!14 = !{!"Simple C++ TBAA"}116!15 = distinct !{!15, !10, !16, !17}117!16 = !DILocation(line: 6, scope: !8)118!17 = !{!"llvm.loop.isvectorized", i32 1}119!18 = !DILocation(line: 0, scope: !8)120!19 = distinct !{!19, !10, !16, !20, !17}121!20 = !{!"llvm.loop.unroll.runtime.disable"}122!21 = !DILocation(line: 7, scope: !8)123