| blob | efeab891d2941112198077e7923afe503597e04e |
1 ; Confirm that the line number for the do.body.preheader block
2 ; branch is the the start of the loop.
4 ; RUN: opt -passes=simplifycfg,loop-simplify -keep-loops="false" -simplifycfg-require-and-preserve-domtree=1 -S <%s | FileCheck %s
6 ; CHECK: do.body.preheader:
7 ; CHECK-NEXT: phi
8 ; CHECK-NEXT: phi
9 ; CHECK-NEXT: br label %do.body, !dbg ![[DL:[0-9]+]]
10 ; CHECK: ![[DL]] = !DILocation(line: 4,
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 ; do
20 ; Total += Bytes[--Count];
21 ; while (Count);
22 ; return Total;
23 ; }
25 define dso_local i32 @"foo"(ptr nocapture readonly %Bytes, i32 %Count) local_unnamed_addr !dbg !8 {
26 entry:
27 %0 = sext i32 %Count to i64, !dbg !10
28 %min.iters.check = icmp ult i32 %Count, 8, !dbg !10
29 br i1 %min.iters.check, label %do.body.preheader, label %vector.ph, !dbg !10
31 vector.ph: ; preds = %entry
32 %n.vec = and i64 %0, -8, !dbg !10
33 %ind.end = sub nsw i64 %0, %n.vec, !dbg !10
34 br label %vector.body, !dbg !10
36 vector.body: ; preds = %vector.body, %vector.ph
37 %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 !11
41 %2 = add i64 %1, %0, !dbg !11
42 %3 = getelementptr inbounds i8, ptr %Bytes, i64 %2, !dbg !11
43 %4 = getelementptr inbounds i8, ptr %3, i64 -3, !dbg !11
44 %5 = bitcast ptr %4 to ptr, !dbg !11
45 %wide.load = load <4 x i8>, ptr %5, align 1, !dbg !11, !tbaa !12
46 %reverse = shufflevector <4 x i8> %wide.load, <4 x i8> poison, <4 x i32> <i32 3, i32 2, i32 1, i32 0>, !dbg !11
47 %6 = getelementptr inbounds i8, ptr %3, i64 -4, !dbg !11
48 %7 = getelementptr inbounds i8, ptr %6, i64 -3, !dbg !11
49 %8 = bitcast ptr %7 to ptr, !dbg !11
50 %wide.load6 = load <4 x i8>, ptr %8, align 1, !dbg !11, !tbaa !12
51 %reverse7 = shufflevector <4 x i8> %wide.load6, <4 x i8> poison, <4 x i32> <i32 3, i32 2, i32 1, i32 0>, !dbg !11
52 %9 = sext <4 x i8> %reverse to <4 x i32>, !dbg !11
53 %10 = sext <4 x i8> %reverse7 to <4 x i32>, !dbg !11
54 %11 = add nsw <4 x i32> %vec.phi, %9, !dbg !11
55 %12 = add nsw <4 x i32> %vec.phi5, %10, !dbg !11
56 %index.next = add i64 %index, 8
57 %13 = icmp eq i64 %index.next, %n.vec
58 br i1 %13, label %middle.block, label %vector.body, !llvm.loop !15
60 middle.block: ; preds = %vector.body
61 %.lcssa12 = phi <4 x i32> [ %11, %vector.body ], !dbg !11
62 %.lcssa = phi <4 x i32> [ %12, %vector.body ], !dbg !11
63 %bin.rdx = add <4 x i32> %.lcssa, %.lcssa12, !dbg !11
64 %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
65 %bin.rdx8 = add <4 x i32> %bin.rdx, %rdx.shuf, !dbg !11
66 %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
67 %bin.rdx10 = add <4 x i32> %bin.rdx8, %rdx.shuf9, !dbg !11
68 %14 = extractelement <4 x i32> %bin.rdx10, i32 0, !dbg !11
69 %cmp.n = icmp eq i64 %n.vec, %0
70 br i1 %cmp.n, label %do.end, label %do.body.preheader, !dbg !10
72 do.body.preheader: ; preds = %middle.block, %entry
73 %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 !11
77 do.body: ; preds = %do.body.preheader, %do.body
78 %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 !18
80 %indvars.iv.next = add nsw i64 %indvars.iv, -1, !dbg !11
81 %arrayidx = getelementptr inbounds i8, ptr %Bytes, i64 %indvars.iv.next, !dbg !11
82 %15 = load i8, ptr %arrayidx, align 1, !dbg !11, !tbaa !12
83 %conv = sext i8 %15 to i32, !dbg !11
84 %add = add nsw i32 %Total.0, %conv, !dbg !11
85 %16 = icmp eq i64 %indvars.iv.next, 0
86 br i1 %16, label %do.end.loopexit, label %do.body, !dbg !11, !llvm.loop !19
88 do.end.loopexit: ; preds = %do.body
89 %add.lcssa11 = phi i32 [ %add, %do.body ], !dbg !11
90 br label %do.end, !dbg !21
92 do.end: ; preds = %do.end.loopexit, %middle.block
93 %add.lcssa = phi i32 [ %14, %middle.block ], [ %add.lcssa11, %do.end.loopexit ], !dbg !11
94 ret i32 %add.lcssa, !dbg !21
95 }
97 !llvm.dbg.cu = !{!0}
98 !llvm.module.flags = !{!3, !4, !5, !6}
99 !llvm.ident = !{!7}
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)