; LLVM IR from codemistic/Data-Structures-and-Algorithms :: Arrays (10_Binary_Search_Using_Recursion)

; 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: nounwind uwtable
define dso_local i32 @RBinSearch(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
  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
  store i32 0, ptr %10, align 4, !tbaa !9
  %12 = load i32, ptr %7, align 4, !tbaa !9
  %13 = load i32, ptr %8, align 4, !tbaa !9
  %14 = icmp sle i32 %12, %13
  br i1 %14, label %15, label %46

15:                                               ; preds = %4
  %16 = load i32, ptr %7, align 4, !tbaa !9
  %17 = load i32, ptr %8, align 4, !tbaa !9
  %18 = add nsw i32 %16, %17
  %19 = sdiv i32 %18, 2
  store i32 %19, ptr %10, align 4, !tbaa !9
  %20 = load i32, ptr %9, align 4, !tbaa !9
  %21 = load ptr, ptr %6, align 8, !tbaa !5
  %22 = load i32, ptr %10, align 4, !tbaa !9
  %23 = sext i32 %22 to i64
  %24 = getelementptr inbounds i32, ptr %21, i64 %23
  %25 = load i32, ptr %24, align 4, !tbaa !9
  %26 = icmp eq i32 %20, %25
  br i1 %26, label %27, label %29

27:                                               ; preds = %15
  %28 = load i32, ptr %10, align 4, !tbaa !9
  store i32 %28, ptr %5, align 4
  store i32 1, ptr %11, align 4
  br label %54

29:                                               ; preds = %15
  %30 = load i32, ptr %9, align 4, !tbaa !9
  %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 = icmp slt i32 %30, %35
  br i1 %36, label %37, label %44

37:                                               ; preds = %29
  %38 = load ptr, ptr %6, align 8, !tbaa !5
  %39 = load i32, ptr %7, align 4, !tbaa !9
  %40 = load i32, ptr %10, align 4, !tbaa !9
  %41 = sub nsw i32 %40, 1
  %42 = load i32, ptr %9, align 4, !tbaa !9
  %43 = call i32 @RBinSearch(ptr noundef %38, i32 noundef %39, i32 noundef %41, i32 noundef %42)
  store i32 %43, ptr %5, align 4
  store i32 1, ptr %11, align 4
  br label %54

44:                                               ; preds = %29
  br label %45

45:                                               ; preds = %44
  br label %53

46:                                               ; preds = %4
  %47 = load ptr, ptr %6, align 8, !tbaa !5
  %48 = load i32, ptr %10, align 4, !tbaa !9
  %49 = add nsw i32 %48, 1
  %50 = load i32, ptr %8, align 4, !tbaa !9
  %51 = load i32, ptr %9, align 4, !tbaa !9
  %52 = call i32 @RBinSearch(ptr noundef %47, i32 noundef %49, i32 noundef %50, i32 noundef %51)
  store i32 %52, ptr %5, align 4
  store i32 1, ptr %11, align 4
  br label %54

53:                                               ; preds = %45
  store i32 -1, ptr %5, align 4
  store i32 1, ptr %11, align 4
  br label %54

54:                                               ; preds = %53, %46, %37, %27
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  %55 = load i32, ptr %5, align 4
  ret i32 %55
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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/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 range(i32 -1073741824, 1073741824) i32 @RBinSearch(ptr nocapture noundef readonly %0, i32 noundef %1, i32 noundef %2, i32 noundef %3) local_unnamed_addr #0 {
  br label %tailrecurse.outer.outer

tailrecurse.outer.outer:                          ; preds = %tailrecurse, %4
  %.tr23.ph.ph = phi i32 [ %1, %4 ], [ 1, %tailrecurse ]
  %.tr24.ph.ph = phi i32 [ %2, %4 ], [ %13, %tailrecurse ]
  %.not27.peel = icmp sgt i32 %.tr23.ph.ph, %.tr24.ph.ph
  br i1 %.not27.peel, label %tailrecurse.outer.outer.peel.newph, label %.lr.ph.preheader

tailrecurse.outer.outer.peel.newph:               ; preds = %tailrecurse.outer.outer
  %.not27 = icmp slt i32 %.tr24.ph.ph, 1
  br label %tailrecurse.outer

tailrecurse.outer:                                ; preds = %tailrecurse.outer.outer.peel.newph, %tailrecurse.outer
  br i1 %.not27, label %tailrecurse.outer, label %.lr.ph.preheader, !llvm.loop !5

.lr.ph.preheader:                                 ; preds = %tailrecurse.outer, %tailrecurse.outer.outer
  %.tr23.ph.lcssa = phi i32 [ %.tr23.ph.ph, %tailrecurse.outer.outer ], [ 1, %tailrecurse.outer ]
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %tailrecurse
  %.tr2428 = phi i32 [ %13, %tailrecurse ], [ %.tr24.ph.ph, %.lr.ph.preheader ]
  %5 = add nsw i32 %.tr2428, %.tr23.ph.lcssa
  %6 = sdiv 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 !7
  %10 = icmp eq i32 %9, %3
  br i1 %10, label %14, label %11

11:                                               ; preds = %.lr.ph
  %12 = icmp sgt i32 %9, %3
  br i1 %12, label %tailrecurse, label %14

tailrecurse:                                      ; preds = %11
  %13 = add nsw i32 %6, -1
  %.not.not = icmp slt i32 %.tr23.ph.lcssa, %6
  br i1 %.not.not, label %.lr.ph, label %tailrecurse.outer.outer

14:                                               ; preds = %11, %.lr.ph
  %.0 = phi i32 [ %6, %.lr.ph ], [ -1, %11 ]
  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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.peeled.count", i32 1}
!7 = !{!8, !8, i64 0}
!8 = !{!"int", !9, i64 0}
!9 = !{!"omnipotent char", !10, i64 0}
!10 = !{!"Simple C/C++ TBAA"}


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