Merging r352555:

    // When the value is absent it is interpreted as 'attribute set'.

    return true;

  case 2:

    return mdconst::extract_or_null<ConstantInt>(MD->getOperand(1).get());

    if (ConstantInt *IntMD =

            mdconst::extract_or_null<ConstantInt>(MD->getOperand(1).get()))

      return IntMD->getZExtValue();

    return true;

  }

  llvm_unreachable("unexpected number of options");

}

; RUN: opt < %s -loop-vectorize -force-vector-width=4 -transform-warning -S 2>&1 | FileCheck %s

; RUN: opt < %s -loop-vectorize -force-vector-width=1 -transform-warning -S 2>&1 | FileCheck %s -check-prefix=NOANALYSIS

; RUN: opt < %s -loop-vectorize -force-vector-width=4 -transform-warning -pass-remarks-missed='loop-vectorize' -S 2>&1 | FileCheck %s -check-prefix=MOREINFO

; This test is a copy of no_switch.ll, with the "llvm.loop.vectorize.enable" metadata set to false.

; It tests that vectorization is explicitly disabled and no warnings are emitted.

; CHECK-NOT: remark: source.cpp:4:5: loop not vectorized: loop contains a switch statement

; CHECK-NOT: warning: source.cpp:4:5: loop not vectorized: the optimizer was unable to perform the requested transformation; the transformation might be disabled or specified as part of an unsupported transformation ordering

; NOANALYSIS-NOT: remark: {{.*}}

; NOANALYSIS-NOT: warning: source.cpp:4:5: loop not vectorized: the optimizer was unable to perform the requested transformation; the transformation might be disabled or specified as part of an unsupported transformation ordering

; MOREINFO: remark: source.cpp:4:5: loop not vectorized: vectorization is explicitly disabled

; MOREINFO-NOT: warning: source.cpp:4:5: loop not vectorized: the optimizer was unable to perform the requested transformation; the transformation might be disabled or specified as part of an unsupported transformation ordering

; CHECK: _Z11test_switchPii

; CHECK-NOT: x i32>

; CHECK: ret

target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"

; Function Attrs: nounwind optsize ssp uwtable

define void @_Z11test_switchPii(i32* nocapture %A, i32 %Length) #0 !dbg !4 {

entry:

  %cmp18 = icmp sgt i32 %Length, 0, !dbg !10

  br i1 %cmp18, label %for.body.preheader, label %for.end, !dbg !10, !llvm.loop !12

for.body.preheader:                               ; preds = %entry

  br label %for.body, !dbg !14

for.body:                                         ; preds = %for.body.preheader, %for.inc

  %indvars.iv = phi i64 [ %indvars.iv.next, %for.inc ], [ 0, %for.body.preheader ]

  %arrayidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv, !dbg !14

  %0 = load i32, i32* %arrayidx, align 4, !dbg !14, !tbaa !16

  switch i32 %0, label %for.inc [

    i32 0, label %sw.bb

    i32 1, label %sw.bb3

  ], !dbg !14

sw.bb:                                            ; preds = %for.body

  %1 = trunc i64 %indvars.iv to i32, !dbg !20

  %mul = shl nsw i32 %1, 1, !dbg !20

  br label %for.inc, !dbg !22

sw.bb3:                                           ; preds = %for.body

  %2 = trunc i64 %indvars.iv to i32, !dbg !23

  store i32 %2, i32* %arrayidx, align 4, !dbg !23, !tbaa !16

  br label %for.inc, !dbg !23

for.inc:                                          ; preds = %sw.bb3, %for.body, %sw.bb

  %storemerge = phi i32 [ %mul, %sw.bb ], [ 0, %for.body ], [ 0, %sw.bb3 ]

  store i32 %storemerge, i32* %arrayidx, align 4, !dbg !20, !tbaa !16

  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1, !dbg !10

  %lftr.wideiv = trunc i64 %indvars.iv.next to i32, !dbg !10

  %exitcond = icmp eq i32 %lftr.wideiv, %Length, !dbg !10

  br i1 %exitcond, label %for.end.loopexit, label %for.body, !dbg !10, !llvm.loop !12

for.end.loopexit:                                 ; preds = %for.inc

  br label %for.end

for.end:                                          ; preds = %for.end.loopexit, %entry

  ret void, !dbg !24

}

attributes #0 = { nounwind }

!llvm.dbg.cu = !{!0}

!llvm.module.flags = !{!7, !8}

!llvm.ident = !{!9}

!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0", isOptimized: true, runtimeVersion: 6, emissionKind: LineTablesOnly, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)

!1 = !DIFile(filename: "source.cpp", directory: ".")

!2 = !{}

!4 = distinct !DISubprogram(name: "test_switch", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 1, file: !1, scope: !5, type: !6, retainedNodes: !2)

!5 = !DIFile(filename: "source.cpp", directory: ".")

!6 = !DISubroutineType(types: !2)

!7 = !{i32 2, !"Dwarf Version", i32 2}

!8 = !{i32 2, !"Debug Info Version", i32 3}

!9 = !{!"clang version 3.5.0"}

!10 = !DILocation(line: 3, column: 8, scope: !11)

!11 = distinct !DILexicalBlock(line: 3, column: 3, file: !1, scope: !4)

!12 = !{!12, !13, !13}

!13 = !{!"llvm.loop.vectorize.enable", i1 false}

!14 = !DILocation(line: 4, column: 5, scope: !15)

!15 = distinct !DILexicalBlock(line: 3, column: 36, file: !1, scope: !11)

!16 = !{!17, !17, i64 0}

!17 = !{!"int", !18, i64 0}

!18 = !{!"omnipotent char", !19, i64 0}

!19 = !{!"Simple C/C++ TBAA"}

!20 = !DILocation(line: 6, column: 7, scope: !21)

!21 = distinct !DILexicalBlock(line: 4, column: 18, file: !1, scope: !15)

!22 = !DILocation(line: 7, column: 5, scope: !21)

!23 = !DILocation(line: 9, column: 7, scope: !21)

!24 = !DILocation(line: 14, column: 1, scope: !4)