; LLVM IR from HarshCasper/NeoAlgo :: C-Plus-Plus/dp/max_sum_rectangle.ll (Z6kadanePii)

; 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 uwtable
define dso_local noundef i32 @_Z6kadanePii(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca i32, align 4
  %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
  %10 = alloca i32, align 4
  %11 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  store i32 0, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  store i32 0, ptr %7, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #3
  store i32 -1, ptr %8, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  store i32 0, ptr %9, align 4, !tbaa !9
  br label %12

12:                                               ; preds = %35, %2
  %13 = load i32, ptr %9, align 4, !tbaa !9
  %14 = load i32, ptr %5, align 4, !tbaa !9
  %15 = icmp slt i32 %13, %14
  br i1 %15, label %17, label %16

16:                                               ; preds = %12
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  br label %38

17:                                               ; preds = %12
  %18 = load ptr, ptr %4, align 8, !tbaa !5
  %19 = load i32, ptr %9, align 4, !tbaa !9
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds i32, ptr %18, i64 %20
  %22 = load i32, ptr %21, align 4, !tbaa !9
  %23 = load i32, ptr %6, align 4, !tbaa !9
  %24 = add nsw i32 %23, %22
  store i32 %24, ptr %6, align 4, !tbaa !9
  %25 = load i32, ptr %7, align 4, !tbaa !9
  %26 = load i32, ptr %6, align 4, !tbaa !9
  %27 = icmp slt i32 %25, %26
  br i1 %27, label %28, label %30

28:                                               ; preds = %17
  %29 = load i32, ptr %6, align 4, !tbaa !9
  store i32 %29, ptr %7, align 4, !tbaa !9
  store i32 0, ptr %8, align 4, !tbaa !9
  br label %30

30:                                               ; preds = %28, %17
  %31 = load i32, ptr %6, align 4, !tbaa !9
  %32 = icmp slt i32 %31, 0
  br i1 %32, label %33, label %34

33:                                               ; preds = %30
  store i32 0, ptr %6, align 4, !tbaa !9
  br label %34

34:                                               ; preds = %33, %30
  br label %35

35:                                               ; preds = %34
  %36 = load i32, ptr %9, align 4, !tbaa !9
  %37 = add nsw i32 %36, 1
  store i32 %37, ptr %9, align 4, !tbaa !9
  br label %12, !llvm.loop !11

38:                                               ; preds = %16
  %39 = load i32, ptr %8, align 4, !tbaa !9
  %40 = icmp ne i32 %39, -1
  br i1 %40, label %41, label %43

41:                                               ; preds = %38
  %42 = load i32, ptr %7, align 4, !tbaa !9
  store i32 %42, ptr %3, align 4
  store i32 1, ptr %10, align 4
  br label %61

43:                                               ; preds = %38
  store i32 -2147483648, ptr %7, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %11) #3
  store i32 0, ptr %11, align 4, !tbaa !9
  br label %44

44:                                               ; preds = %56, %43
  %45 = load i32, ptr %11, align 4, !tbaa !9
  %46 = load i32, ptr %5, align 4, !tbaa !9
  %47 = icmp slt i32 %45, %46
  br i1 %47, label %49, label %48

48:                                               ; preds = %44
  store i32 5, ptr %10, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %11) #3
  br label %59

49:                                               ; preds = %44
  %50 = load ptr, ptr %4, align 8, !tbaa !5
  %51 = load i32, ptr %11, align 4, !tbaa !9
  %52 = sext i32 %51 to i64
  %53 = getelementptr inbounds i32, ptr %50, i64 %52
  %54 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %53, ptr noundef nonnull align 4 dereferenceable(4) %7)
  %55 = load i32, ptr %54, align 4, !tbaa !9
  store i32 %55, ptr %7, align 4, !tbaa !9
  br label %56

56:                                               ; preds = %49
  %57 = load i32, ptr %11, align 4, !tbaa !9
  %58 = add nsw i32 %57, 1
  store i32 %58, ptr %11, align 4, !tbaa !9
  br label %44, !llvm.loop !13

59:                                               ; preds = %48
  %60 = load i32, ptr %7, align 4, !tbaa !9
  store i32 %60, ptr %3, align 4
  store i32 1, ptr %10, align 4
  br label %61

61:                                               ; preds = %59, %41
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  %62 = load i32, ptr %3, align 4
  ret i32 %62
}

; 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

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) #2

attributes #0 = { mustprogress 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 = { inlinehint 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 #3 = { 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"}
!13 = distinct !{!13, !12}


; 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 nounwind uwtable
define dso_local noundef i32 @_Z6kadanePii(ptr noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %3) #4
  %4 = icmp sgt i32 %1, 0
  br i1 %4, label %.lr.ph.preheader, label %.loopexit

.lr.ph.preheader:                                 ; preds = %2
  %wide.trip.count = zext nneg i32 %1 to i64
  %xtraiter = and i64 %wide.trip.count, 1
  %5 = icmp eq i32 %1, 1
  br i1 %5, label %._crit_edge.unr-lcssa, label %.lr.ph.preheader.new

.lr.ph.preheader.new:                             ; preds = %.lr.ph.preheader
  %unroll_iter = and i64 %wide.trip.count, 2147483646
  br label %.lr.ph

._crit_edge.unr-lcssa:                            ; preds = %.lr.ph, %.lr.ph.preheader
  %spec.select.lcssa.ph = phi i32 [ poison, %.lr.ph.preheader ], [ %spec.select.1, %.lr.ph ]
  %spec.select28.lcssa.ph = phi i32 [ poison, %.lr.ph.preheader ], [ %spec.select28.1, %.lr.ph ]
  %indvars.iv.unr = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next.1, %.lr.ph ]
  %.01622.unr = phi i32 [ -1, %.lr.ph.preheader ], [ %spec.select28.1, %.lr.ph ]
  %.01721.unr = phi i32 [ 0, %.lr.ph.preheader ], [ %spec.store.select.1, %.lr.ph ]
  %.unr = phi i32 [ 0, %.lr.ph.preheader ], [ %spec.select.1, %.lr.ph ]
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %._crit_edge, label %.lr.ph.epil

.lr.ph.epil:                                      ; preds = %._crit_edge.unr-lcssa
  %6 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv.unr
  %7 = load i32, ptr %6, align 4, !tbaa !5
  %8 = add nsw i32 %7, %.01721.unr
  %9 = icmp slt i32 %.unr, %8
  %spec.select.epil = tail call i32 @llvm.smax.i32(i32 %.unr, i32 %8)
  %spec.select28.epil = select i1 %9, i32 0, i32 %.01622.unr
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.unr-lcssa, %.lr.ph.epil
  %spec.select.lcssa = phi i32 [ %spec.select.lcssa.ph, %._crit_edge.unr-lcssa ], [ %spec.select.epil, %.lr.ph.epil ]
  %spec.select28.lcssa = phi i32 [ %spec.select28.lcssa.ph, %._crit_edge.unr-lcssa ], [ %spec.select28.epil, %.lr.ph.epil ]
  %10 = icmp eq i32 %spec.select28.lcssa, -1
  br i1 %10, label %21, label %.loopexit

.lr.ph:                                           ; preds = %.lr.ph, %.lr.ph.preheader.new
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader.new ], [ %indvars.iv.next.1, %.lr.ph ]
  %.01622 = phi i32 [ -1, %.lr.ph.preheader.new ], [ %spec.select28.1, %.lr.ph ]
  %.01721 = phi i32 [ 0, %.lr.ph.preheader.new ], [ %spec.store.select.1, %.lr.ph ]
  %11 = phi i32 [ 0, %.lr.ph.preheader.new ], [ %spec.select.1, %.lr.ph ]
  %niter = phi i64 [ 0, %.lr.ph.preheader.new ], [ %niter.next.1, %.lr.ph ]
  %12 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv
  %13 = load i32, ptr %12, align 4, !tbaa !5
  %14 = add nsw i32 %13, %.01721
  %15 = icmp slt i32 %11, %14
  %spec.select = tail call i32 @llvm.smax.i32(i32 %11, i32 %14)
  %spec.store.select = tail call i32 @llvm.smax.i32(i32 %14, i32 0)
  %indvars.iv.next = or disjoint i64 %indvars.iv, 1
  %16 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv.next
  %17 = load i32, ptr %16, align 4, !tbaa !5
  %18 = add nsw i32 %17, %spec.store.select
  %19 = icmp slt i32 %spec.select, %18
  %spec.select.1 = tail call i32 @llvm.smax.i32(i32 %spec.select, i32 %18)
  %20 = or i1 %19, %15
  %spec.select28.1 = select i1 %20, i32 0, i32 %.01622
  %spec.store.select.1 = tail call i32 @llvm.smax.i32(i32 %18, i32 0)
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %niter.next.1 = add i64 %niter, 2
  %niter.ncmp.1 = icmp eq i64 %niter.next.1, %unroll_iter
  br i1 %niter.ncmp.1, label %._crit_edge.unr-lcssa, label %.lr.ph, !llvm.loop !9

21:                                               ; preds = %._crit_edge
  store i32 -2147483648, ptr %3, align 4, !tbaa !5
  br i1 %4, label %.lr.ph27.preheader, label %.loopexit

.lr.ph27.preheader:                               ; preds = %21
  %wide.trip.count33 = zext nneg i32 %1 to i64
  br label %.lr.ph27

.lr.ph27:                                         ; preds = %.lr.ph27.preheader, %.lr.ph27
  %indvars.iv30 = phi i64 [ 0, %.lr.ph27.preheader ], [ %indvars.iv.next31, %.lr.ph27 ]
  %22 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv30
  %23 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %22, ptr noundef nonnull align 4 dereferenceable(4) %3)
  %24 = load i32, ptr %23, align 4, !tbaa !5
  store i32 %24, ptr %3, align 4, !tbaa !5
  %indvars.iv.next31 = add nuw nsw i64 %indvars.iv30, 1
  %exitcond34.not = icmp eq i64 %indvars.iv.next31, %wide.trip.count33
  br i1 %exitcond34.not, label %.loopexit, label %.lr.ph27, !llvm.loop !11

.loopexit:                                        ; preds = %.lr.ph27, %2, %21, %._crit_edge
  %.018 = phi i32 [ -2147483648, %21 ], [ %spec.select.lcssa, %._crit_edge ], [ -2147483648, %2 ], [ %24, %.lr.ph27 ]
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %3) #4
  ret i32 %.018
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #2

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.smax.i32(i32, i32) #3

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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { inlinehint 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 #3 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
attributes #4 = { 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}


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