| ; Confirm that the line number for the do.body.preheader block |
| ; branch is the the start of the loop. |
| |
| ; RUN: opt -simplifycfg -simplifycfg-require-and-preserve-domtree=1 -loop-simplify -keep-loops="false" -S <%s | FileCheck %s |
| |
| ; CHECK: do.body.preheader: |
| ; CHECK-NEXT: phi |
| ; CHECK-NEXT: phi |
| ; CHECK-NEXT: br label %do.body, !dbg ![[DL:[0-9]+]] |
| ; CHECK: ![[DL]] = !DILocation(line: 4, |
| |
| ; This IR can be generated by running: |
| ; clang src.cpp -O2 -g -S -emit-llvm -mllvm -opt-bisect-limit=62 -o - |
| ; |
| ; Where src.cpp contains: |
| ; int foo(char *Bytes, int Count) |
| ; { |
| ; int Total = 0; |
| ; do |
| ; Total += Bytes[--Count]; |
| ; while (Count); |
| ; return Total; |
| ; } |
| |
| define dso_local i32 @"foo"(i8* nocapture readonly %Bytes, i32 %Count) local_unnamed_addr !dbg !8 { |
| entry: |
| %0 = sext i32 %Count to i64, !dbg !10 |
| %min.iters.check = icmp ult i32 %Count, 8, !dbg !10 |
| br i1 %min.iters.check, label %do.body.preheader, label %vector.ph, !dbg !10 |
| |
| vector.ph: ; preds = %entry |
| %n.vec = and i64 %0, -8, !dbg !10 |
| %ind.end = sub nsw i64 %0, %n.vec, !dbg !10 |
| br label %vector.body, !dbg !10 |
| |
| vector.body: ; preds = %vector.body, %vector.ph |
| %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ] |
| %vec.phi = phi <4 x i32> [ zeroinitializer, %vector.ph ], [ %11, %vector.body ] |
| %vec.phi5 = phi <4 x i32> [ zeroinitializer, %vector.ph ], [ %12, %vector.body ] |
| %1 = xor i64 %index, -1, !dbg !11 |
| %2 = add i64 %1, %0, !dbg !11 |
| %3 = getelementptr inbounds i8, i8* %Bytes, i64 %2, !dbg !11 |
| %4 = getelementptr inbounds i8, i8* %3, i64 -3, !dbg !11 |
| %5 = bitcast i8* %4 to <4 x i8>*, !dbg !11 |
| %wide.load = load <4 x i8>, <4 x i8>* %5, align 1, !dbg !11, !tbaa !12 |
| %reverse = shufflevector <4 x i8> %wide.load, <4 x i8> poison, <4 x i32> <i32 3, i32 2, i32 1, i32 0>, !dbg !11 |
| %6 = getelementptr inbounds i8, i8* %3, i64 -4, !dbg !11 |
| %7 = getelementptr inbounds i8, i8* %6, i64 -3, !dbg !11 |
| %8 = bitcast i8* %7 to <4 x i8>*, !dbg !11 |
| %wide.load6 = load <4 x i8>, <4 x i8>* %8, align 1, !dbg !11, !tbaa !12 |
| %reverse7 = shufflevector <4 x i8> %wide.load6, <4 x i8> poison, <4 x i32> <i32 3, i32 2, i32 1, i32 0>, !dbg !11 |
| %9 = sext <4 x i8> %reverse to <4 x i32>, !dbg !11 |
| %10 = sext <4 x i8> %reverse7 to <4 x i32>, !dbg !11 |
| %11 = add nsw <4 x i32> %vec.phi, %9, !dbg !11 |
| %12 = add nsw <4 x i32> %vec.phi5, %10, !dbg !11 |
| %index.next = add i64 %index, 8 |
| %13 = icmp eq i64 %index.next, %n.vec |
| br i1 %13, label %middle.block, label %vector.body, !llvm.loop !15 |
| |
| middle.block: ; preds = %vector.body |
| %.lcssa12 = phi <4 x i32> [ %11, %vector.body ], !dbg !11 |
| %.lcssa = phi <4 x i32> [ %12, %vector.body ], !dbg !11 |
| %bin.rdx = add <4 x i32> %.lcssa, %.lcssa12, !dbg !11 |
| %rdx.shuf = shufflevector <4 x i32> %bin.rdx, <4 x i32> poison, <4 x i32> <i32 2, i32 3, i32 undef, i32 undef>, !dbg !11 |
| %bin.rdx8 = add <4 x i32> %bin.rdx, %rdx.shuf, !dbg !11 |
| %rdx.shuf9 = shufflevector <4 x i32> %bin.rdx8, <4 x i32> poison, <4 x i32> <i32 1, i32 undef, i32 undef, i32 undef>, !dbg !11 |
| %bin.rdx10 = add <4 x i32> %bin.rdx8, %rdx.shuf9, !dbg !11 |
| %14 = extractelement <4 x i32> %bin.rdx10, i32 0, !dbg !11 |
| %cmp.n = icmp eq i64 %n.vec, %0 |
| br i1 %cmp.n, label %do.end, label %do.body.preheader, !dbg !10 |
| |
| do.body.preheader: ; preds = %middle.block, %entry |
| %indvars.iv.ph = phi i64 [ %0, %entry ], [ %ind.end, %middle.block ] |
| %Total.0.ph = phi i32 [ 0, %entry ], [ %14, %middle.block ] |
| br label %do.body, !dbg !11 |
| |
| do.body: ; preds = %do.body.preheader, %do.body |
| %indvars.iv = phi i64 [ %indvars.iv.next, %do.body ], [ %indvars.iv.ph, %do.body.preheader ] |
| %Total.0 = phi i32 [ %add, %do.body ], [ %Total.0.ph, %do.body.preheader ], !dbg !18 |
| %indvars.iv.next = add nsw i64 %indvars.iv, -1, !dbg !11 |
| %arrayidx = getelementptr inbounds i8, i8* %Bytes, i64 %indvars.iv.next, !dbg !11 |
| %15 = load i8, i8* %arrayidx, align 1, !dbg !11, !tbaa !12 |
| %conv = sext i8 %15 to i32, !dbg !11 |
| %add = add nsw i32 %Total.0, %conv, !dbg !11 |
| %16 = icmp eq i64 %indvars.iv.next, 0 |
| br i1 %16, label %do.end.loopexit, label %do.body, !dbg !11, !llvm.loop !19 |
| |
| do.end.loopexit: ; preds = %do.body |
| %add.lcssa11 = phi i32 [ %add, %do.body ], !dbg !11 |
| br label %do.end, !dbg !21 |
| |
| do.end: ; preds = %do.end.loopexit, %middle.block |
| %add.lcssa = phi i32 [ %14, %middle.block ], [ %add.lcssa11, %do.end.loopexit ], !dbg !11 |
| ret i32 %add.lcssa, !dbg !21 |
| } |
| |
| !llvm.dbg.cu = !{!0} |
| !llvm.module.flags = !{!3, !4, !5, !6} |
| !llvm.ident = !{!7} |
| |
| !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !2, nameTableKind: None) |
| !1 = !DIFile(filename: "src2.cpp", directory: "") |
| !2 = !{} |
| !3 = !{i32 2, !"CodeView", i32 1} |
| !4 = !{i32 2, !"Debug Info Version", i32 3} |
| !5 = !{i32 1, !"wchar_size", i32 2} |
| !6 = !{i32 7, !"PIC Level", i32 2} |
| !7 = !{!""} |
| !8 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 1, type: !9, scopeLine: 2, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !2) |
| !9 = !DISubroutineType(types: !2) |
| !10 = !DILocation(line: 4, scope: !8) |
| !11 = !DILocation(line: 5, scope: !8) |
| !12 = !{!13, !13, i64 0} |
| !13 = !{!"omnipotent char", !14, i64 0} |
| !14 = !{!"Simple C++ TBAA"} |
| !15 = distinct !{!15, !10, !16, !17} |
| !16 = !DILocation(line: 6, scope: !8) |
| !17 = !{!"llvm.loop.isvectorized", i32 1} |
| !18 = !DILocation(line: 0, scope: !8) |
| !19 = distinct !{!19, !10, !16, !20, !17} |
| !20 = !{!"llvm.loop.unroll.runtime.disable"} |
| !21 = !DILocation(line: 7, scope: !8) |