1; RUN: opt < %s -loop-vectorize -force-vector-width=4 -S -pass-remarks-missed='loop-vectorize' -pass-remarks-analysis='loop-vectorize' 2>&1 | FileCheck %s
2
3; CHECK: remark: source.cpp:4:5: loop not vectorized: loop contains a switch statement
4; CHECK: remark: source.cpp:4:5: loop not vectorized: use -Rpass-analysis=loop-vectorize for more info (Force=true, Vector Width=4)
5; CHECK: warning: source.cpp:4:5: loop not vectorized: failed explicitly specified loop vectorization
6
7; CHECK: _Z11test_switchPii
8; CHECK-NOT: x i32>
9; CHECK: ret
10
11target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
12
13; Function Attrs: nounwind optsize ssp uwtable
14define void @_Z11test_switchPii(i32* nocapture %A, i32 %Length) #0 {
15entry:
16  %cmp18 = icmp sgt i32 %Length, 0, !dbg !10
17  br i1 %cmp18, label %for.body.preheader, label %for.end, !dbg !10, !llvm.loop !12
18
19for.body.preheader:                               ; preds = %entry
20  br label %for.body, !dbg !14
21
22for.body:                                         ; preds = %for.body.preheader, %for.inc
23  %indvars.iv = phi i64 [ %indvars.iv.next, %for.inc ], [ 0, %for.body.preheader ]
24  %arrayidx = getelementptr inbounds i32* %A, i64 %indvars.iv, !dbg !14
25  %0 = load i32* %arrayidx, align 4, !dbg !14, !tbaa !16
26  switch i32 %0, label %for.inc [
27    i32 0, label %sw.bb
28    i32 1, label %sw.bb3
29  ], !dbg !14
30
31sw.bb:                                            ; preds = %for.body
32  %1 = trunc i64 %indvars.iv to i32, !dbg !20
33  %mul = shl nsw i32 %1, 1, !dbg !20
34  br label %for.inc, !dbg !22
35
36sw.bb3:                                           ; preds = %for.body
37  %2 = trunc i64 %indvars.iv to i32, !dbg !23
38  store i32 %2, i32* %arrayidx, align 4, !dbg !23, !tbaa !16
39  br label %for.inc, !dbg !23
40
41for.inc:                                          ; preds = %sw.bb3, %for.body, %sw.bb
42  %storemerge = phi i32 [ %mul, %sw.bb ], [ 0, %for.body ], [ 0, %sw.bb3 ]
43  store i32 %storemerge, i32* %arrayidx, align 4, !dbg !20, !tbaa !16
44  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1, !dbg !10
45  %lftr.wideiv = trunc i64 %indvars.iv.next to i32, !dbg !10
46  %exitcond = icmp eq i32 %lftr.wideiv, %Length, !dbg !10
47  br i1 %exitcond, label %for.end.loopexit, label %for.body, !dbg !10, !llvm.loop !12
48
49for.end.loopexit:                                 ; preds = %for.inc
50  br label %for.end
51
52for.end:                                          ; preds = %for.end.loopexit, %entry
53  ret void, !dbg !24
54}
55
56attributes #0 = { nounwind }
57
58!llvm.dbg.cu = !{!0}
59!llvm.module.flags = !{!7, !8}
60!llvm.ident = !{!9}
61
62!0 = metadata !{i32 786449, metadata !1, i32 4, metadata !"clang version 3.5.0", i1 true, metadata !"", i32 0, metadata !2, metadata !2, metadata !3, metadata !2, metadata !2, metadata !"", i32 2}
63!1 = metadata !{metadata !"source.cpp", metadata !"."}
64!2 = metadata !{}
65!3 = metadata !{metadata !4}
66!4 = metadata !{i32 786478, metadata !1, metadata !5, metadata !"test_switch", metadata !"test_switch", metadata !"", i32 1, metadata !6, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 true, void (i32*, i32)* @_Z11test_switchPii, null, null, metadata !2, i32 1}
67!5 = metadata !{i32 786473, metadata !1}
68!6 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !2, i32 0, null, null, null}
69!7 = metadata !{i32 2, metadata !"Dwarf Version", i32 2}
70!8 = metadata !{i32 2, metadata !"Debug Info Version", i32 1}
71!9 = metadata !{metadata !"clang version 3.5.0"}
72!10 = metadata !{i32 3, i32 8, metadata !11, null}
73!11 = metadata !{i32 786443, metadata !1, metadata !4, i32 3, i32 3, i32 0, i32 0}
74!12 = metadata !{metadata !12, metadata !13, metadata !13}
75!13 = metadata !{metadata !"llvm.loop.vectorize.enable", i1 true}
76!14 = metadata !{i32 4, i32 5, metadata !15, null}
77!15 = metadata !{i32 786443, metadata !1, metadata !11, i32 3, i32 36, i32 0, i32 1}
78!16 = metadata !{metadata !17, metadata !17, i64 0}
79!17 = metadata !{metadata !"int", metadata !18, i64 0}
80!18 = metadata !{metadata !"omnipotent char", metadata !19, i64 0}
81!19 = metadata !{metadata !"Simple C/C++ TBAA"}
82!20 = metadata !{i32 6, i32 7, metadata !21, null}
83!21 = metadata !{i32 786443, metadata !1, metadata !15, i32 4, i32 18, i32 0, i32 2}
84!22 = metadata !{i32 7, i32 5, metadata !21, null}
85!23 = metadata !{i32 9, i32 7, metadata !21, null}
86!24 = metadata !{i32 14, i32 1, metadata !4, null}
87