; LLVM IR from ritikbanger/Hacktoberfest2022-DSA :: 05. Searching/BinarySearch_Using_Pivot.ll (Z12BinarySearchPiiii)

; 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: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z12BinarySearchPiiii(ptr noundef %0, i32 noundef %1, i32 noundef %2, i32 noundef %3) #1 {
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  %11 = alloca i32, align 4
  %12 = alloca i32, align 4
  %13 = alloca i32, align 4
  store ptr %0, ptr %6, align 8, !tbaa !5
  store i32 %1, ptr %7, align 4, !tbaa !9
  store i32 %2, ptr %8, align 4, !tbaa !9
  store i32 %3, ptr %9, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  %14 = load i32, ptr %7, align 4, !tbaa !9
  store i32 %14, ptr %10, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %11) #2
  %15 = load i32, ptr %8, align 4, !tbaa !9
  store i32 %15, ptr %11, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %12) #2
  %16 = load i32, ptr %10, align 4, !tbaa !9
  %17 = load i32, ptr %11, align 4, !tbaa !9
  %18 = load i32, ptr %10, align 4, !tbaa !9
  %19 = sub nsw i32 %17, %18
  %20 = sdiv i32 %19, 2
  %21 = add nsw i32 %16, %20
  store i32 %21, ptr %12, align 4, !tbaa !9
  br label %22

22:                                               ; preds = %50, %4
  %23 = load i32, ptr %10, align 4, !tbaa !9
  %24 = load i32, ptr %11, align 4, !tbaa !9
  %25 = icmp sle i32 %23, %24
  br i1 %25, label %26, label %57

26:                                               ; preds = %22
  %27 = load ptr, ptr %6, align 8, !tbaa !5
  %28 = load i32, ptr %12, 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 = load i32, ptr %9, align 4, !tbaa !9
  %33 = icmp eq i32 %31, %32
  br i1 %33, label %34, label %36

34:                                               ; preds = %26
  %35 = load i32, ptr %12, align 4, !tbaa !9
  store i32 %35, ptr %5, align 4
  store i32 1, ptr %13, align 4
  br label %58

36:                                               ; preds = %26
  %37 = load ptr, ptr %6, align 8, !tbaa !5
  %38 = load i32, ptr %12, 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 = load i32, ptr %9, align 4, !tbaa !9
  %43 = icmp slt i32 %41, %42
  br i1 %43, label %44, label %47

44:                                               ; preds = %36
  %45 = load i32, ptr %12, align 4, !tbaa !9
  %46 = add nsw i32 %45, 1
  store i32 %46, ptr %10, align 4, !tbaa !9
  br label %50

47:                                               ; preds = %36
  %48 = load i32, ptr %12, align 4, !tbaa !9
  %49 = sub nsw i32 %48, 1
  store i32 %49, ptr %11, align 4, !tbaa !9
  br label %50

50:                                               ; preds = %47, %44
  %51 = load i32, ptr %10, align 4, !tbaa !9
  %52 = load i32, ptr %11, align 4, !tbaa !9
  %53 = load i32, ptr %10, align 4, !tbaa !9
  %54 = sub nsw i32 %52, %53
  %55 = sdiv i32 %54, 2
  %56 = add nsw i32 %51, %55
  store i32 %56, ptr %12, align 4, !tbaa !9
  br label %22, !llvm.loop !11

57:                                               ; preds = %22
  store i32 -1, ptr %5, align 4
  store i32 1, ptr %13, align 4
  br label %58

58:                                               ; preds = %57, %34
  call void @llvm.lifetime.end.p0(i64 4, ptr %12) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %11) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  %59 = load i32, ptr %5, align 4
  ret i32 %59
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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 @_Z12BinarySearchPiiii(ptr nocapture noundef readonly %0, i32 noundef %1, i32 noundef %2, i32 noundef %3) local_unnamed_addr #0 {
  %.not25 = icmp sgt i32 %1, %2
  br i1 %.not25, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %4
  %5 = sub nsw i32 %2, %1
  %6 = sdiv i32 %5, 2
  %7 = add nsw i32 %6, %1
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %12
  %.028 = phi i32 [ %18, %12 ], [ %7, %.lr.ph.preheader ]
  %.01927 = phi i32 [ %.1, %12 ], [ %2, %.lr.ph.preheader ]
  %.02026 = phi i32 [ %.121, %12 ], [ %1, %.lr.ph.preheader ]
  %8 = sext i32 %.028 to i64
  %9 = getelementptr inbounds i32, ptr %0, i64 %8
  %10 = load i32, ptr %9, align 4, !tbaa !5
  %11 = icmp eq i32 %10, %3
  br i1 %11, label %._crit_edge, label %12

12:                                               ; preds = %.lr.ph
  %13 = icmp slt i32 %10, %3
  %14 = add nsw i32 %.028, 1
  %15 = add nsw i32 %.028, -1
  %.121 = select i1 %13, i32 %14, i32 %.02026
  %.1 = select i1 %13, i32 %.01927, i32 %15
  %16 = sub nsw i32 %.1, %.121
  %17 = sdiv i32 %16, 2
  %18 = add nsw i32 %17, %.121
  %.not = icmp sgt i32 %.121, %.1
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %12, %4
  %.022 = phi i32 [ -1, %4 ], [ -1, %12 ], [ %.028, %.lr.ph ]
  ret i32 %.022
}

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