; LLVM IR from HarshCasper/NeoAlgo :: C-Plus-Plus/cp/Find_transition_point.ll (Z15transitionPointPii)

; 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 @_Z15transitionPointPii(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
  %9 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  %10 = load ptr, ptr %4, align 8, !tbaa !5
  %11 = getelementptr inbounds i32, ptr %10, i64 0
  %12 = load i32, ptr %11, align 4, !tbaa !9
  %13 = icmp ne i32 %12, 0
  br i1 %13, label %14, label %15

14:                                               ; preds = %2
  store i32 0, ptr %3, align 4
  br label %64

15:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 0, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  %16 = load i32, ptr %5, align 4, !tbaa !9
  %17 = sub nsw i32 %16, 1
  store i32 %17, ptr %7, align 4, !tbaa !9
  br label %18

18:                                               ; preds = %61, %15
  %19 = load i32, ptr %6, align 4, !tbaa !9
  %20 = load i32, ptr %7, align 4, !tbaa !9
  %21 = icmp sle i32 %19, %20
  br i1 %21, label %22, label %62

22:                                               ; preds = %18
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  %23 = load i32, ptr %6, align 4, !tbaa !9
  %24 = load i32, ptr %7, align 4, !tbaa !9
  %25 = add nsw i32 %23, %24
  %26 = sdiv i32 %25, 2
  store i32 %26, ptr %8, align 4, !tbaa !9
  %27 = load ptr, ptr %4, align 8, !tbaa !5
  %28 = load i32, ptr %8, align 4, !tbaa !9
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds i32, ptr %27, i64 %29
  %31 = load i32, ptr %30, align 4, !tbaa !9
  %32 = icmp eq i32 %31, 0
  br i1 %32, label %33, label %36

33:                                               ; preds = %22
  %34 = load i32, ptr %8, align 4, !tbaa !9
  %35 = add nsw i32 %34, 1
  store i32 %35, ptr %6, align 4, !tbaa !9
  br label %58

36:                                               ; preds = %22
  %37 = load ptr, ptr %4, align 8, !tbaa !5
  %38 = load i32, ptr %8, align 4, !tbaa !9
  %39 = sext i32 %38 to i64
  %40 = getelementptr inbounds i32, ptr %37, i64 %39
  %41 = load i32, ptr %40, align 4, !tbaa !9
  %42 = icmp eq i32 %41, 1
  br i1 %42, label %43, label %57

43:                                               ; preds = %36
  %44 = load ptr, ptr %4, align 8, !tbaa !5
  %45 = load i32, ptr %8, align 4, !tbaa !9
  %46 = sub nsw i32 %45, 1
  %47 = sext i32 %46 to i64
  %48 = getelementptr inbounds i32, ptr %44, i64 %47
  %49 = load i32, ptr %48, align 4, !tbaa !9
  %50 = icmp eq i32 %49, 0
  br i1 %50, label %51, label %53

51:                                               ; preds = %43
  %52 = load i32, ptr %8, align 4, !tbaa !9
  store i32 %52, ptr %3, align 4
  store i32 1, ptr %9, align 4
  br label %59

53:                                               ; preds = %43
  %54 = load i32, ptr %8, align 4, !tbaa !9
  %55 = sub nsw i32 %54, 1
  store i32 %55, ptr %7, align 4, !tbaa !9
  br label %56

56:                                               ; preds = %53
  br label %57

57:                                               ; preds = %56, %36
  br label %58

58:                                               ; preds = %57, %33
  store i32 0, ptr %9, align 4
  br label %59

59:                                               ; preds = %58, %51
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  %60 = load i32, ptr %9, align 4
  switch i32 %60, label %63 [
    i32 0, label %61
  ]

61:                                               ; preds = %59
  br label %18, !llvm.loop !11

62:                                               ; preds = %18
  store i32 -1, ptr %3, align 4
  store i32 1, ptr %9, align 4
  br label %63

63:                                               ; preds = %62, %59
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  br label %64

64:                                               ; preds = %63, %14
  %65 = load i32, ptr %3, align 4
  ret i32 %65
}

; 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"}


; 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 @_Z15transitionPointPii(ptr nocapture noundef readonly %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = load i32, ptr %0, align 4, !tbaa !5
  %.not = icmp eq i32 %3, 0
  br i1 %.not, label %4, label %.thread

4:                                                ; preds = %2
  %.not2429 = icmp slt i32 %1, 1
  br i1 %.not2429, label %.thread, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %4
  %5 = add nsw i32 %1, -1
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %19
  %.01731 = phi i32 [ %.219, %19 ], [ %5, %.lr.ph.preheader ]
  %.02030 = phi i32 [ %.222, %19 ], [ 0, %.lr.ph.preheader ]
  %6 = add nuw nsw i32 %.01731, %.02030
  %7 = lshr i32 %6, 1
  %8 = zext nneg i32 %7 to i64
  %9 = getelementptr inbounds i32, ptr %0, i64 %8
  %10 = load i32, ptr %9, align 4, !tbaa !5
  switch i32 %10, label %19 [
    i32 0, label %11
    i32 1, label %13
  ]

11:                                               ; preds = %.lr.ph
  %12 = add nuw nsw i32 %7, 1
  br label %19

13:                                               ; preds = %.lr.ph
  %14 = add nsw i32 %7, -1
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds i32, ptr %0, i64 %15
  %17 = load i32, ptr %16, align 4, !tbaa !5
  %18 = icmp eq i32 %17, 0
  br i1 %18, label %.thread, label %19

19:                                               ; preds = %13, %11, %.lr.ph
  %.222 = phi i32 [ %12, %11 ], [ %.02030, %.lr.ph ], [ %.02030, %13 ]
  %.219 = phi i32 [ %.01731, %11 ], [ %.01731, %.lr.ph ], [ %14, %13 ]
  %.not24 = icmp sgt i32 %.222, %.219
  br i1 %.not24, label %.thread, label %.lr.ph, !llvm.loop !9

.thread:                                          ; preds = %19, %13, %4, %2
  %.3 = phi i32 [ 0, %2 ], [ -1, %4 ], [ -1, %19 ], [ %7, %13 ]
  ret i32 %.3
}

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,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass