; LLVM IR from HarshCasper/NeoAlgo :: C/cp (painter_partition)

; 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 @painters(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
  %12 = alloca i32, align 4
  %13 = 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
  call void @llvm.lifetime.start.p0(i64 4, ptr %11) #2
  store i32 1, ptr %11, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %12) #2
  store i32 0, ptr %12, align 4, !tbaa !9
  br label %14

14:                                               ; preds = %44, %4
  %15 = load i32, ptr %12, align 4, !tbaa !9
  %16 = load i32, ptr %8, align 4, !tbaa !9
  %17 = icmp slt i32 %15, %16
  br i1 %17, label %19, label %18

18:                                               ; preds = %14
  store i32 2, ptr %13, align 4
  br label %47

19:                                               ; preds = %14
  %20 = load ptr, ptr %6, align 8, !tbaa !5
  %21 = load i32, ptr %12, align 4, !tbaa !9
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds i32, ptr %20, i64 %22
  %24 = load i32, ptr %23, align 4, !tbaa !9
  %25 = load i32, ptr %10, align 4, !tbaa !9
  %26 = add nsw i32 %25, %24
  store i32 %26, ptr %10, align 4, !tbaa !9
  %27 = load i32, ptr %10, align 4, !tbaa !9
  %28 = load i32, ptr %7, align 4, !tbaa !9
  %29 = icmp sgt i32 %27, %28
  br i1 %29, label %30, label %43

30:                                               ; preds = %19
  %31 = load ptr, ptr %6, align 8, !tbaa !5
  %32 = load i32, ptr %12, 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
  store i32 %35, ptr %10, align 4, !tbaa !9
  %36 = load i32, ptr %11, align 4, !tbaa !9
  %37 = add nsw i32 %36, 1
  store i32 %37, ptr %11, align 4, !tbaa !9
  %38 = load i32, ptr %11, align 4, !tbaa !9
  %39 = load i32, ptr %9, align 4, !tbaa !9
  %40 = icmp sgt i32 %38, %39
  br i1 %40, label %41, label %42

41:                                               ; preds = %30
  store i32 0, ptr %5, align 4
  store i32 1, ptr %13, align 4
  br label %47

42:                                               ; preds = %30
  br label %43

43:                                               ; preds = %42, %19
  br label %44

44:                                               ; preds = %43
  %45 = load i32, ptr %12, align 4, !tbaa !9
  %46 = add nsw i32 %45, 1
  store i32 %46, ptr %12, align 4, !tbaa !9
  br label %14, !llvm.loop !11

47:                                               ; preds = %41, %18
  call void @llvm.lifetime.end.p0(i64 4, ptr %12) #2
  %48 = load i32, ptr %13, align 4
  switch i32 %48, label %50 [
    i32 2, label %49
  ]

49:                                               ; preds = %47
  store i32 1, ptr %5, align 4
  store i32 1, ptr %13, align 4
  br label %50

50:                                               ; preds = %49, %47
  call void @llvm.lifetime.end.p0(i64 4, ptr %11) #2
  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}
!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 range(i32 0, 2) i32 @painters(ptr nocapture noundef readonly %0, i32 noundef %1, i32 noundef %2, i32 noundef %3) local_unnamed_addr #0 {
  %.not2223 = icmp slt i32 %2, 1
  br i1 %.not2223, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %4
  %5 = zext nneg i32 %2 to i64
  %wide.trip.count = zext nneg i32 %2 to i64
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %12
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next, %12 ]
  %.not2227 = phi i1 [ false, %.lr.ph.preheader ], [ %.not22, %12 ]
  %.01525 = phi i32 [ 1, %.lr.ph.preheader ], [ %.1, %12 ]
  %.01624 = phi i32 [ 0, %.lr.ph.preheader ], [ %.117, %12 ]
  %6 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv
  %7 = load i32, ptr %6, align 4, !tbaa !5
  %8 = add nsw i32 %7, %.01624
  %9 = icmp sgt i32 %8, %1
  br i1 %9, label %10, label %12

10:                                               ; preds = %.lr.ph
  %11 = add nsw i32 %.01525, 1
  %.not = icmp slt i32 %.01525, %3
  br i1 %.not, label %12, label %._crit_edge.loopexit

12:                                               ; preds = %.lr.ph, %10
  %.117 = phi i32 [ %7, %10 ], [ %8, %.lr.ph ]
  %.1 = phi i32 [ %11, %10 ], [ %.01525, %.lr.ph ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %.not22 = icmp uge i64 %indvars.iv.next, %5
  %exitcond = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond, label %._crit_edge.loopexit, label %.lr.ph, !llvm.loop !9

._crit_edge.loopexit:                             ; preds = %10, %12
  %.not22.lcssa.ph = phi i1 [ %.not22, %12 ], [ %.not2227, %10 ]
  %13 = zext i1 %.not22.lcssa.ph to i32
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %4
  %.not22.lcssa = phi i32 [ 1, %4 ], [ %13, %._crit_edge.loopexit ]
  ret i32 %.not22.lcssa
}

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,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass