; LLVM IR from devparthgarg/Data-Structures-and-Algorithms :: 06. Searching/16 Repeating Element/16a.ll (Z16repeatingElementPii)

; Unoptimized IR (clang -disable-llvm-passes):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z16repeatingElementPii(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 0, ptr %6, align 4, !tbaa !9
  br label %9

9:                                                ; preds = %47, %2
  %10 = load i32, ptr %6, align 4, !tbaa !9
  %11 = load i32, ptr %5, align 4, !tbaa !9
  %12 = icmp slt i32 %10, %11
  br i1 %12, label %14, label %13

13:                                               ; preds = %9
  store i32 2, ptr %7, align 4
  br label %50

14:                                               ; preds = %9
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  %15 = load i32, ptr %6, align 4, !tbaa !9
  %16 = add nsw i32 %15, 1
  store i32 %16, ptr %8, align 4, !tbaa !9
  br label %17

17:                                               ; preds = %41, %14
  %18 = load i32, ptr %8, align 4, !tbaa !9
  %19 = load i32, ptr %5, align 4, !tbaa !9
  %20 = icmp slt i32 %18, %19
  br i1 %20, label %22, label %21

21:                                               ; preds = %17
  store i32 5, ptr %7, align 4
  br label %44

22:                                               ; preds = %17
  %23 = load ptr, ptr %4, align 8, !tbaa !5
  %24 = load i32, ptr %6, align 4, !tbaa !9
  %25 = sext i32 %24 to i64
  %26 = getelementptr inbounds i32, ptr %23, i64 %25
  %27 = load i32, ptr %26, align 4, !tbaa !9
  %28 = load ptr, ptr %4, align 8, !tbaa !5
  %29 = load i32, ptr %8, align 4, !tbaa !9
  %30 = sext i32 %29 to i64
  %31 = getelementptr inbounds i32, ptr %28, i64 %30
  %32 = load i32, ptr %31, align 4, !tbaa !9
  %33 = icmp eq i32 %27, %32
  br i1 %33, label %34, label %40

34:                                               ; preds = %22
  %35 = load ptr, ptr %4, align 8, !tbaa !5
  %36 = load i32, ptr %6, align 4, !tbaa !9
  %37 = sext i32 %36 to i64
  %38 = getelementptr inbounds i32, ptr %35, i64 %37
  %39 = load i32, ptr %38, align 4, !tbaa !9
  store i32 %39, ptr %3, align 4
  store i32 1, ptr %7, align 4
  br label %44

40:                                               ; preds = %22
  br label %41

41:                                               ; preds = %40
  %42 = load i32, ptr %8, align 4, !tbaa !9
  %43 = add nsw i32 %42, 1
  store i32 %43, ptr %8, align 4, !tbaa !9
  br label %17, !llvm.loop !11

44:                                               ; preds = %34, %21
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  %45 = load i32, ptr %7, align 4
  switch i32 %45, label %50 [
    i32 5, label %46
  ]

46:                                               ; preds = %44
  br label %47

47:                                               ; preds = %46
  %48 = load i32, ptr %6, align 4, !tbaa !9
  %49 = add nsw i32 %48, 1
  store i32 %49, ptr %6, align 4, !tbaa !9
  br label %9, !llvm.loop !13

50:                                               ; preds = %44, %13
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  %51 = load i32, ptr %7, align 4
  switch i32 %51, label %55 [
    i32 2, label %52
    i32 1, label %53
  ]

52:                                               ; preds = %50
  store i32 -1, ptr %3, align 4
  br label %53

53:                                               ; preds = %52, %50
  %54 = load i32, ptr %3, align 4
  ret i32 %54

55:                                               ; preds = %50
  unreachable
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

attributes #0 = { mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { nounwind }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}


; Optimized IR (opt -passes='default<O3>'):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: read) uwtable
define dso_local noundef i32 @_Z16repeatingElementPii(ptr nocapture noundef readonly %0, i32 noundef %1) local_unnamed_addr #0 {
  %.not2327 = icmp sgt i32 %1, 0
  br i1 %.not2327, label %.lr.ph29.preheader, label %.thread

.lr.ph29.preheader:                               ; preds = %2
  %3 = zext nneg i32 %1 to i64
  %wide.trip.count37 = zext nneg i32 %1 to i64
  br label %.lr.ph29

.loopexit:                                        ; preds = %6, %.lr.ph29
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond38.not = icmp eq i64 %indvars.iv.next35, %wide.trip.count37
  br i1 %exitcond38.not, label %.thread, label %.lr.ph29

.lr.ph29:                                         ; preds = %.lr.ph29.preheader, %.loopexit
  %indvars.iv34 = phi i64 [ 0, %.lr.ph29.preheader ], [ %indvars.iv.next35, %.loopexit ]
  %indvars.iv = phi i64 [ 1, %.lr.ph29.preheader ], [ %indvars.iv.next, %.loopexit ]
  %indvars.iv.next35 = add nuw nsw i64 %indvars.iv34, 1
  %.not25 = icmp ult i64 %indvars.iv.next35, %3
  br i1 %.not25, label %.lr.ph, label %.loopexit

.lr.ph:                                           ; preds = %.lr.ph29
  %4 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv34
  %5 = load i32, ptr %4, align 4, !tbaa !5
  br label %7

6:                                                ; preds = %7
  %indvars.iv.next32 = add nuw nsw i64 %indvars.iv31, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next32, %wide.trip.count37
  br i1 %exitcond.not, label %.loopexit, label %7, !llvm.loop !9

7:                                                ; preds = %.lr.ph, %6
  %indvars.iv31 = phi i64 [ %indvars.iv, %.lr.ph ], [ %indvars.iv.next32, %6 ]
  %8 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv31
  %9 = load i32, ptr %8, align 4, !tbaa !5
  %10 = icmp eq i32 %5, %9
  br i1 %10, label %.thread, label %6

.thread:                                          ; preds = %.loopexit, %7, %2
  %spec.select = phi i32 [ -1, %2 ], [ %5, %7 ], [ -1, %.loopexit ]
  ret i32 %spec.select
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: read) uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopInstSimplifyPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass