; LLVM IR from JessonYue/LeetCodeLearning :: BaseDataStructure/BinarySearch.ll (Z12binarySearchPiii)

; 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: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z12binarySearchPiii(ptr noundef %0, i32 noundef %1, i32 noundef %2) #1 {
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %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
  store ptr %0, ptr %5, align 8, !tbaa !5
  store i32 %1, ptr %6, align 4, !tbaa !9
  store i32 %2, ptr %7, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  store i32 1, ptr %8, align 4, !tbaa !9
  %12 = load i32, ptr %6, align 4, !tbaa !9
  store i32 %12, ptr %9, align 4, !tbaa !9
  br label %13

13:                                               ; preds = %46, %3
  %14 = load i32, ptr %8, align 4, !tbaa !9
  %15 = load i32, ptr %9, align 4, !tbaa !9
  %16 = icmp sle i32 %14, %15
  br i1 %16, label %17, label %47

17:                                               ; preds = %13
  %18 = load i32, ptr %8, align 4, !tbaa !9
  %19 = load i32, ptr %9, align 4, !tbaa !9
  %20 = add nsw i32 %18, %19
  %21 = sdiv i32 %20, 2
  store i32 %21, ptr %10, align 4, !tbaa !9
  %22 = load i32, ptr %7, align 4, !tbaa !9
  %23 = load ptr, ptr %5, align 8, !tbaa !5
  %24 = load i32, ptr %10, 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 = icmp slt i32 %22, %27
  br i1 %28, label %29, label %32

29:                                               ; preds = %17
  %30 = load i32, ptr %10, align 4, !tbaa !9
  %31 = sub nsw i32 %30, 1
  store i32 %31, ptr %9, align 4, !tbaa !9
  br label %46

32:                                               ; preds = %17
  %33 = load i32, ptr %7, align 4, !tbaa !9
  %34 = load ptr, ptr %5, align 8, !tbaa !5
  %35 = load i32, ptr %10, align 4, !tbaa !9
  %36 = sext i32 %35 to i64
  %37 = getelementptr inbounds i32, ptr %34, i64 %36
  %38 = load i32, ptr %37, align 4, !tbaa !9
  %39 = icmp sgt i32 %33, %38
  br i1 %39, label %40, label %43

40:                                               ; preds = %32
  %41 = load i32, ptr %10, align 4, !tbaa !9
  %42 = add nsw i32 %41, 1
  store i32 %42, ptr %8, align 4, !tbaa !9
  br label %45

43:                                               ; preds = %32
  %44 = load i32, ptr %10, align 4, !tbaa !9
  store i32 %44, ptr %4, align 4
  store i32 1, ptr %11, align 4
  br label %48

45:                                               ; preds = %40
  br label %46

46:                                               ; preds = %45, %29
  br label %13, !llvm.loop !11

47:                                               ; preds = %13
  store i32 0, ptr %4, align 4
  store i32 1, ptr %11, align 4
  br label %48

48:                                               ; preds = %47, %43
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  %49 = load i32, ptr %4, align 4
  ret i32 %49
}

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

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 range(i32 0, 1073741824) i32 @_Z12binarySearchPiii(ptr nocapture noundef readonly %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %.not19 = icmp slt i32 %1, 1
  br i1 %.not19, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %3, %16
  %.01421 = phi i32 [ %.1, %16 ], [ %1, %3 ]
  %.01520 = phi i32 [ %.116, %16 ], [ 1, %3 ]
  %4 = add nuw nsw i32 %.01421, %.01520
  %5 = lshr i32 %4, 1
  %6 = zext nneg i32 %5 to i64
  %7 = getelementptr inbounds i32, ptr %0, i64 %6
  %8 = load i32, ptr %7, align 4, !tbaa !5
  %9 = icmp sgt i32 %8, %2
  br i1 %9, label %10, label %12

10:                                               ; preds = %.lr.ph
  %11 = add nsw i32 %5, -1
  br label %16

12:                                               ; preds = %.lr.ph
  %13 = icmp slt i32 %8, %2
  br i1 %13, label %14, label %._crit_edge

14:                                               ; preds = %12
  %15 = add nuw nsw i32 %5, 1
  br label %16

16:                                               ; preds = %14, %10
  %.116 = phi i32 [ %.01520, %10 ], [ %15, %14 ]
  %.1 = phi i32 [ %11, %10 ], [ %.01421, %14 ]
  %.not = icmp sgt i32 %.116, %.1
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %12, %16, %3
  %.0 = phi i32 [ 0, %3 ], [ 0, %16 ], [ %5, %12 ]
  ret i32 %.0
}

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