; LLVM IR from Hunterdii/GeeksforGeeks-POTD :: December 2024 GFG SOLUTION (December-19)

; 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 @kthMissing(ptr noundef %0, i32 noundef %1, i32 noundef %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  store i32 %2, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  store i32 0, ptr %7, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  %10 = load i32, ptr %5, align 4, !tbaa !9
  store i32 %10, ptr %8, align 4, !tbaa !9
  br label %11

11:                                               ; preds = %37, %3
  %12 = load i32, ptr %7, align 4, !tbaa !9
  %13 = load i32, ptr %8, align 4, !tbaa !9
  %14 = icmp slt i32 %12, %13
  br i1 %14, label %15, label %38

15:                                               ; preds = %11
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  %16 = load i32, ptr %7, align 4, !tbaa !9
  %17 = load i32, ptr %8, align 4, !tbaa !9
  %18 = load i32, ptr %7, 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 %9, align 4, !tbaa !9
  %22 = load ptr, ptr %4, align 8, !tbaa !5
  %23 = load i32, ptr %9, align 4, !tbaa !9
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds i32, ptr %22, i64 %24
  %26 = load i32, ptr %25, align 4, !tbaa !9
  %27 = load i32, ptr %9, align 4, !tbaa !9
  %28 = add nsw i32 %27, 1
  %29 = sub nsw i32 %26, %28
  %30 = load i32, ptr %6, align 4, !tbaa !9
  %31 = icmp slt i32 %29, %30
  br i1 %31, label %32, label %35

32:                                               ; preds = %15
  %33 = load i32, ptr %9, align 4, !tbaa !9
  %34 = add nsw i32 %33, 1
  store i32 %34, ptr %7, align 4, !tbaa !9
  br label %37

35:                                               ; preds = %15
  %36 = load i32, ptr %9, align 4, !tbaa !9
  store i32 %36, ptr %8, align 4, !tbaa !9
  br label %37

37:                                               ; preds = %35, %32
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  br label %11, !llvm.loop !11

38:                                               ; preds = %11
  %39 = load i32, ptr %7, align 4, !tbaa !9
  %40 = load i32, ptr %6, align 4, !tbaa !9
  %41 = add nsw i32 %39, %40
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  ret i32 %41
}

; 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}
!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: nofree norecurse nosync nounwind memory(argmem: read) uwtable
define dso_local i32 @kthMissing(ptr nocapture noundef readonly %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = icmp sgt i32 %1, 0
  br i1 %4, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %3, %.lr.ph
  %.016 = phi i32 [ %..0, %.lr.ph ], [ 0, %3 ]
  %.01315 = phi i32 [ %.013., %.lr.ph ], [ %1, %3 ]
  %5 = sub nsw i32 %.01315, %.016
  %6 = sdiv i32 %5, 2
  %7 = add nsw i32 %6, %.016
  %8 = sext i32 %7 to i64
  %9 = getelementptr inbounds i32, ptr %0, i64 %8
  %10 = load i32, ptr %9, align 4, !tbaa !5
  %11 = add nsw i32 %7, 1
  %12 = sub nsw i32 %10, %11
  %13 = icmp slt i32 %12, %2
  %.013. = select i1 %13, i32 %.01315, i32 %7
  %..0 = select i1 %13, i32 %11, i32 %.016
  %14 = icmp slt i32 %..0, %.013.
  br i1 %14, label %.lr.ph, label %._crit_edge, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %3
  %.0.lcssa = phi i32 [ 0, %3 ], [ %..0, %.lr.ph ]
  %15 = add nsw i32 %.0.lcssa, %2
  ret i32 %15
}

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"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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