; LLVM IR from ritikbanger/Hacktoberfest2022-DSA :: 03. Recursion (binrec)

; 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: nounwind uwtable
define dso_local i32 @binsearch(ptr noundef %0, i32 noundef %1, i32 noundef %2, i32 noundef %3) #0 {
  %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
  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
  %12 = load i32, ptr %8, align 4, !tbaa !9
  %13 = load i32, ptr %9, align 4, !tbaa !9
  %14 = sdiv i32 %13, 2
  %15 = add nsw i32 %12, %14
  store i32 %15, ptr %10, align 4, !tbaa !9
  %16 = load i32, ptr %7, align 4, !tbaa !9
  %17 = load ptr, ptr %6, align 8, !tbaa !5
  %18 = load i32, ptr %10, align 4, !tbaa !9
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds i32, ptr %17, i64 %19
  %21 = load i32, ptr %20, align 4, !tbaa !9
  %22 = icmp eq i32 %16, %21
  br i1 %22, label %23, label %25

23:                                               ; preds = %4
  %24 = load i32, ptr %10, align 4, !tbaa !9
  store i32 %24, ptr %5, align 4
  store i32 1, ptr %11, align 4
  br label %50

25:                                               ; preds = %4
  %26 = load i32, ptr %8, align 4, !tbaa !9
  %27 = load i32, ptr %9, align 4, !tbaa !9
  %28 = icmp sgt i32 %26, %27
  br i1 %28, label %29, label %30

29:                                               ; preds = %25
  store i32 -1, ptr %5, align 4
  store i32 1, ptr %11, align 4
  br label %50

30:                                               ; preds = %25
  %31 = load ptr, ptr %6, align 8, !tbaa !5
  %32 = load i32, ptr %10, align 4, !tbaa !9
  %33 = sext i32 %32 to i64
  %34 = getelementptr inbounds i32, ptr %31, i64 %33
  %35 = load i32, ptr %34, align 4, !tbaa !9
  %36 = load i32, ptr %7, align 4, !tbaa !9
  %37 = icmp sgt i32 %35, %36
  br i1 %37, label %38, label %44

38:                                               ; preds = %30
  %39 = load ptr, ptr %6, align 8, !tbaa !5
  %40 = load i32, ptr %7, align 4, !tbaa !9
  %41 = load i32, ptr %8, align 4, !tbaa !9
  %42 = load i32, ptr %10, align 4, !tbaa !9
  %43 = call i32 @binsearch(ptr noundef %39, i32 noundef %40, i32 noundef %41, i32 noundef %42)
  store i32 %43, ptr %5, align 4
  store i32 1, ptr %11, align 4
  br label %50

44:                                               ; preds = %30
  %45 = load ptr, ptr %6, align 8, !tbaa !5
  %46 = load i32, ptr %7, align 4, !tbaa !9
  %47 = load i32, ptr %10, align 4, !tbaa !9
  %48 = load i32, ptr %9, align 4, !tbaa !9
  %49 = call i32 @binsearch(ptr noundef %45, i32 noundef %46, i32 noundef %47, i32 noundef %48)
  store i32 %49, ptr %5, align 4
  store i32 1, ptr %11, align 4
  br label %50

50:                                               ; preds = %44, %38, %29, %23
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  %51 = load i32, ptr %5, align 4
  ret i32 %51
}

; 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 = { 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/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}


; 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: nofree norecurse nosync nounwind memory(argmem: read) uwtable
define dso_local i32 @binsearch(ptr nocapture noundef readonly %0, i32 noundef %1, i32 noundef %2, i32 noundef %3) local_unnamed_addr #0 {
  %5 = sdiv i32 %3, 2
  %6 = add nsw i32 %5, %2
  %7 = sext i32 %6 to i64
  %8 = getelementptr inbounds i32, ptr %0, i64 %7
  %9 = load i32, ptr %8, align 4, !tbaa !5
  %10 = icmp eq i32 %9, %1
  br i1 %10, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %4, %tailrecurse
  %11 = phi i32 [ %19, %tailrecurse ], [ %9, %4 ]
  %12 = phi i32 [ %16, %tailrecurse ], [ %6, %4 ]
  %.tr2527 = phi i32 [ %..tr25, %tailrecurse ], [ %3, %4 ]
  %.tr2426 = phi i32 [ %.tr24., %tailrecurse ], [ %2, %4 ]
  %13 = icmp sgt i32 %.tr2426, %.tr2527
  br i1 %13, label %._crit_edge, label %tailrecurse

tailrecurse:                                      ; preds = %.lr.ph
  %14 = icmp sgt i32 %11, %1
  %.tr24. = select i1 %14, i32 %.tr2426, i32 %12
  %..tr25 = select i1 %14, i32 %12, i32 %.tr2527
  %15 = sdiv i32 %..tr25, 2
  %16 = add nsw i32 %15, %.tr24.
  %17 = sext i32 %16 to i64
  %18 = getelementptr inbounds i32, ptr %0, i64 %17
  %19 = load i32, ptr %18, align 4, !tbaa !5
  %20 = icmp eq i32 %19, %1
  br i1 %20, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %tailrecurse, %.lr.ph, %4
  %.0 = phi i32 [ %6, %4 ], [ -1, %.lr.ph ], [ %16, %tailrecurse ]
  ret i32 %.0
}

attributes #0 = { nofree norecurse nosync nounwind 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/C++ TBAA"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass