; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes='loop-mssa(simple-loop-unswitch<nontrivial>),verify<loops>' -S < %s | FileCheck %s
;
;; Check that when we duplicate the load in the loop header, we also duplicate
;; the corresponding dbg.value.
;; FIXME: the hoisted load dominates the duplicated dbg.value, however as it's
;; not subsequently used in the loop, so it doesn't get remapped into the
;; debug user and we get a undef/poison dbg.value. This is suboptimal, but it's
;; important that the dbg.value gets duplicated nonetheless.

declare void @clobber()
declare void @llvm.dbg.value(metadata, metadata, metadata)

define i32 @partial_unswitch_true_successor(ptr %ptr, i32 %N) {
; CHECK-LABEL: @partial_unswitch_true_successor(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[TMP0:%.*]] = load i32, ptr [[PTR:%.*]], align 4
; CHECK-NEXT:    [[TMP1:%.*]] = icmp eq i32 [[TMP0]], 100
; CHECK-NEXT:    br i1 [[TMP1]], label [[ENTRY_SPLIT_US:%.*]], label [[ENTRY_SPLIT:%.*]]
; CHECK:       entry.split.us:
; CHECK-NEXT:    br label [[LOOP_HEADER_US:%.*]]
; CHECK:       loop.header.us:
; CHECK-NEXT:    [[IV_US:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT_US]] ], [ [[IV_NEXT_US:%.*]], [[LOOP_LATCH_US:%.*]] ]
; CHECK-NEXT:      #dbg_value(i32 poison, [[META3:![0-9]+]], !DIExpression(), [[META8:![0-9]+]])
; CHECK-NEXT:    br label [[NOCLOBBER_US:%.*]]
; CHECK:       noclobber.us:
; CHECK-NEXT:    br label [[LOOP_LATCH_US]]
; CHECK:       loop.latch.us:
; CHECK-NEXT:    [[C_US:%.*]] = icmp ult i32 [[IV_US]], [[N:%.*]]
; CHECK-NEXT:    [[IV_NEXT_US]] = add i32 [[IV_US]], 1
; CHECK-NEXT:    br i1 [[C_US]], label [[LOOP_HEADER_US]], label [[EXIT_SPLIT_US:%.*]]
; CHECK:       exit.split.us:
; CHECK-NEXT:    br label [[EXIT:%.*]]
; CHECK:       entry.split:
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT]] ], [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[LV:%.*]] = load i32, ptr [[PTR]], align 4
; CHECK-NEXT:      #dbg_value(i32 [[LV]], [[META3]], !DIExpression(), [[META8]])
; CHECK-NEXT:    [[SC:%.*]] = icmp eq i32 [[LV]], 100
; CHECK-NEXT:    br i1 [[SC]], label [[NOCLOBBER:%.*]], label [[CLOBBER:%.*]]
; CHECK:       noclobber:
; CHECK-NEXT:    br label [[LOOP_LATCH]]
; CHECK:       clobber:
; CHECK-NEXT:    call void @clobber()
; CHECK-NEXT:    br label [[LOOP_LATCH]]
; CHECK:       loop.latch:
; CHECK-NEXT:    [[C:%.*]] = icmp ult i32 [[IV]], [[N]]
; CHECK-NEXT:    [[IV_NEXT]] = add i32 [[IV]], 1
; CHECK-NEXT:    br i1 [[C]], label [[LOOP_HEADER]], label [[EXIT_SPLIT:%.*]], !llvm.loop [[LOOP9:![0-9]+]]
; CHECK:       exit.split:
; CHECK-NEXT:    br label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret i32 10
;
entry:
  br label %loop.header

loop.header:
  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop.latch ]
  %lv = load i32, ptr %ptr
  call void @llvm.dbg.value(metadata i32 %lv, metadata !6, metadata !DIExpression()), !dbg !7
  %sc = icmp eq i32 %lv, 100
  br i1 %sc, label %noclobber, label %clobber

noclobber:
  br label %loop.latch

clobber:
  call void @clobber()
  br label %loop.latch

loop.latch:
  %c = icmp ult i32 %iv, %N
  %iv.next = add i32 %iv, 1
  br i1 %c, label %loop.header, label %exit

exit:
  ret i32 10
}

!llvm.module.flags = !{!21}
!llvm.dbg.cu = !{!2}

!0 = distinct !DISubprogram(name: "foo", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !2, file: !20, scope: !1, type: !3)
!1 = !DIFile(filename: "b.c", directory: "/private/tmp")
!2 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang", isOptimized: true, emissionKind: FullDebug, file: !20)
!3 = !DISubroutineType(types: !4)
!4 = !{!5}
!5 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!6 = !DILocalVariable(name: "i", line: 2, arg: 1, scope: !0, file: !1, type: !5)
!7 = !DILocation(line: 2, column: 13, scope: !0)
!9 = !DILocalVariable(name: "k", line: 3, scope: !10, file: !1, type: !5)
!10 = distinct !DILexicalBlock(line: 2, column: 16, file: !20, scope: !0)
!11 = !DILocation(line: 3, column: 12, scope: !10)
!12 = !DILocation(line: 4, column: 3, scope: !10)
!13 = !DILocation(line: 5, column: 5, scope: !14)
!14 = distinct !DILexicalBlock(line: 4, column: 10, file: !20, scope: !10)
!15 = !DILocation(line: 6, column: 3, scope: !14)
!16 = !DILocation(line: 7, column: 5, scope: !17)
!17 = distinct !DILexicalBlock(line: 6, column: 10, file: !20, scope: !10)
!18 = !DILocation(line: 8, column: 3, scope: !17)
!19 = !DILocation(line: 9, column: 3, scope: !10)
!20 = !DIFile(filename: "b.c", directory: "/private/tmp")
!21 = !{i32 1, !"Debug Info Version", i32 3}