; LLVM IR from HarshCasper/NeoAlgo :: C-Plus-Plus/search/Binary_Search.ll (Z13binary_searchPiiii)

; 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 zeroext i1 @_Z13binary_searchPiiii(ptr noundef %0, i32 noundef %1, i32 noundef %2, i32 noundef %3) #0 {
  %5 = alloca i1, align 1
  %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
  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
  br label %12

12:                                               ; preds = %49, %4
  %13 = load i32, ptr %8, align 4, !tbaa !9
  %14 = load i32, ptr %9, align 4, !tbaa !9
  %15 = icmp sle i32 %13, %14
  br i1 %15, label %16, label %50

16:                                               ; preds = %12
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  %17 = load i32, ptr %8, align 4, !tbaa !9
  %18 = load i32, ptr %9, align 4, !tbaa !9
  %19 = load i32, ptr %8, align 4, !tbaa !9
  %20 = sub nsw i32 %18, %19
  %21 = sdiv i32 %20, 2
  %22 = add nsw i32 %17, %21
  store i32 %22, ptr %10, align 4, !tbaa !9
  %23 = load ptr, ptr %6, 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 = load i32, ptr %7, align 4, !tbaa !9
  %29 = icmp eq i32 %27, %28
  br i1 %29, label %30, label %31

30:                                               ; preds = %16
  store i1 true, ptr %5, align 1
  store i32 1, ptr %11, align 4
  br label %47

31:                                               ; preds = %16
  %32 = load ptr, ptr %6, align 8, !tbaa !5
  %33 = load i32, ptr %10, align 4, !tbaa !9
  %34 = sext i32 %33 to i64
  %35 = getelementptr inbounds i32, ptr %32, i64 %34
  %36 = load i32, ptr %35, align 4, !tbaa !9
  %37 = load i32, ptr %7, align 4, !tbaa !9
  %38 = icmp sgt i32 %36, %37
  br i1 %38, label %39, label %42

39:                                               ; preds = %31
  %40 = load i32, ptr %10, align 4, !tbaa !9
  %41 = sub nsw i32 %40, 1
  store i32 %41, ptr %9, align 4, !tbaa !9
  br label %45

42:                                               ; preds = %31
  %43 = load i32, ptr %10, align 4, !tbaa !9
  %44 = add nsw i32 %43, 1
  store i32 %44, ptr %8, align 4, !tbaa !9
  br label %45

45:                                               ; preds = %42, %39
  br label %46

46:                                               ; preds = %45
  store i32 0, ptr %11, align 4
  br label %47

47:                                               ; preds = %46, %30
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  %48 = load i32, ptr %11, align 4
  switch i32 %48, label %53 [
    i32 0, label %49
    i32 1, label %51
  ]

49:                                               ; preds = %47
  br label %12, !llvm.loop !11

50:                                               ; preds = %12
  store i1 false, ptr %5, align 1
  br label %51

51:                                               ; preds = %50, %47
  %52 = load i1, ptr %5, align 1
  ret i1 %52

53:                                               ; preds = %47
  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"}


; 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 zeroext i1 @_Z13binary_searchPiiii(ptr nocapture noundef readonly %0, i32 noundef %1, i32 noundef %2, i32 noundef %3) local_unnamed_addr #0 {
  %.not26.not = icmp sgt i32 %2, %3
  br i1 %.not26.not, label %.thread, label %.lr.ph

.lr.ph:                                           ; preds = %4, %12
  %.01528 = phi i32 [ %.116, %12 ], [ %3, %4 ]
  %.01827 = phi i32 [ %.119, %12 ], [ %2, %4 ]
  %5 = sub nsw i32 %.01528, %.01827
  %6 = sdiv i32 %5, 2
  %7 = add nsw i32 %6, %.01827
  %8 = sext i32 %7 to i64
  %9 = getelementptr inbounds i32, ptr %0, i64 %8
  %10 = load i32, ptr %9, align 4, !tbaa !5
  %11 = icmp eq i32 %10, %1
  br i1 %11, label %.thread, label %12

12:                                               ; preds = %.lr.ph
  %13 = icmp sgt i32 %10, %1
  %14 = add nsw i32 %7, -1
  %15 = add nsw i32 %7, 1
  %.119 = select i1 %13, i32 %.01827, i32 %15
  %.116 = select i1 %13, i32 %14, i32 %.01528
  %.not.not = icmp sgt i32 %.119, %.116
  br i1 %.not.not, label %.thread, label %.lr.ph

.thread:                                          ; preds = %12, %.lr.ph, %4
  %.not.lcssa = phi i1 [ false, %4 ], [ %11, %.lr.ph ], [ %11, %12 ]
  ret i1 %.not.lcssa
}

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"}


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