; LLVM IR from abeaumont/competitive-programming :: hackerrank/algorithms/unbounded-knapsack.ll (Z1fi)

; 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"

@a = external dso_local global [2000 x i32], align 16
@c = external dso_local global [2001 x i32], align 16
@n = external dso_local global i32, align 4

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z1fi(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  %8 = load i32, ptr %3, align 4, !tbaa !5
  %9 = icmp eq i32 %8, 0
  br i1 %9, label %10, label %11

10:                                               ; preds = %1
  store i32 0, ptr %2, align 4
  br label %53

11:                                               ; preds = %1
  %12 = load i32, ptr %3, align 4, !tbaa !5
  %13 = sext i32 %12 to i64
  %14 = getelementptr inbounds [2001 x i32], ptr @c, i64 0, i64 %13
  %15 = load i32, ptr %14, align 4, !tbaa !5
  %16 = icmp ne i32 %15, -1
  br i1 %16, label %17, label %22

17:                                               ; preds = %11
  %18 = load i32, ptr %3, align 4, !tbaa !5
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds [2001 x i32], ptr @c, i64 0, i64 %19
  %21 = load i32, ptr %20, align 4, !tbaa !5
  store i32 %21, ptr %2, align 4
  br label %53

22:                                               ; preds = %11
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  %23 = load i32, ptr %3, align 4, !tbaa !5
  store i32 %23, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  store i32 0, ptr %5, align 4, !tbaa !5
  br label %24

24:                                               ; preds = %44, %22
  %25 = load i32, ptr %5, align 4, !tbaa !5
  %26 = load i32, ptr @n, align 4, !tbaa !5
  %27 = icmp slt i32 %25, %26
  br i1 %27, label %29, label %28

28:                                               ; preds = %24
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  br label %47

29:                                               ; preds = %24
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  %30 = load i32, ptr %3, align 4, !tbaa !5
  %31 = load i32, ptr %5, align 4, !tbaa !5
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds [2000 x i32], ptr @a, i64 0, i64 %32
  %34 = load i32, ptr %33, align 4, !tbaa !5
  %35 = sub nsw i32 %30, %34
  store i32 %35, ptr %6, align 4, !tbaa !5
  %36 = load i32, ptr %6, align 4, !tbaa !5
  %37 = icmp sge i32 %36, 0
  br i1 %37, label %38, label %43

38:                                               ; preds = %29
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  %39 = load i32, ptr %6, align 4, !tbaa !5
  %40 = call noundef i32 @_Z1fi(i32 noundef %39)
  store i32 %40, ptr %7, align 4, !tbaa !5
  %41 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %4, ptr noundef nonnull align 4 dereferenceable(4) %7)
  %42 = load i32, ptr %41, align 4, !tbaa !5
  store i32 %42, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  br label %43

43:                                               ; preds = %38, %29
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  br label %44

44:                                               ; preds = %43
  %45 = load i32, ptr %5, align 4, !tbaa !5
  %46 = add nsw i32 %45, 1
  store i32 %46, ptr %5, align 4, !tbaa !5
  br label %24, !llvm.loop !9

47:                                               ; preds = %28
  %48 = load i32, ptr %4, align 4, !tbaa !5
  %49 = load i32, ptr %3, align 4, !tbaa !5
  %50 = sext i32 %49 to i64
  %51 = getelementptr inbounds [2001 x i32], ptr @c, i64 0, i64 %50
  store i32 %48, ptr %51, align 4, !tbaa !5
  %52 = load i32, ptr %4, align 4, !tbaa !5
  store i32 %52, ptr %2, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  br label %53

53:                                               ; preds = %47, %17, %10
  %54 = load i32, ptr %2, align 4
  ret i32 %54
}

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

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) #2

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

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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"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"

@a = external dso_local local_unnamed_addr global [2000 x i32], align 16
@c = external dso_local local_unnamed_addr global [2001 x i32], align 16
@n = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z1fi(i32 noundef %0) local_unnamed_addr #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = icmp eq i32 %0, 0
  br i1 %4, label %28, label %5

5:                                                ; preds = %1
  %6 = sext i32 %0 to i64
  %7 = getelementptr inbounds [2001 x i32], ptr @c, i64 0, i64 %6
  %8 = load i32, ptr %7, align 4, !tbaa !5
  %.not = icmp eq i32 %8, -1
  br i1 %.not, label %9, label %28

9:                                                ; preds = %5
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %2) #3
  store i32 %0, ptr %2, align 4, !tbaa !5
  %10 = load i32, ptr @n, align 4, !tbaa !5
  %11 = icmp sgt i32 %10, 0
  br i1 %11, label %.lr.ph, label %._crit_edge

._crit_edge:                                      ; preds = %23, %9
  %12 = phi i32 [ %0, %9 ], [ %24, %23 ]
  store i32 %12, ptr %7, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %2) #3
  br label %28

.lr.ph:                                           ; preds = %9, %23
  %13 = phi i32 [ %24, %23 ], [ %0, %9 ]
  %14 = phi i32 [ %25, %23 ], [ %10, %9 ]
  %indvars.iv = phi i64 [ %indvars.iv.next, %23 ], [ 0, %9 ]
  %15 = getelementptr inbounds [2000 x i32], ptr @a, i64 0, i64 %indvars.iv
  %16 = load i32, ptr %15, align 4, !tbaa !5
  %17 = sub nsw i32 %0, %16
  %18 = icmp sgt i32 %17, -1
  br i1 %18, label %19, label %23

19:                                               ; preds = %.lr.ph
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %3) #3
  %20 = call noundef i32 @_Z1fi(i32 noundef %17)
  store i32 %20, ptr %3, align 4, !tbaa !5
  %21 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %2, ptr noundef nonnull align 4 dereferenceable(4) %3)
  %22 = load i32, ptr %21, align 4, !tbaa !5
  store i32 %22, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %3) #3
  %.pre = load i32, ptr @n, align 4, !tbaa !5
  br label %23

23:                                               ; preds = %19, %.lr.ph
  %24 = phi i32 [ %22, %19 ], [ %13, %.lr.ph ]
  %25 = phi i32 [ %.pre, %19 ], [ %14, %.lr.ph ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %26 = sext i32 %25 to i64
  %27 = icmp slt i64 %indvars.iv.next, %26
  br i1 %27, label %.lr.ph, label %._crit_edge, !llvm.loop !9

28:                                               ; preds = %5, %1, %._crit_edge
  %.0 = phi i32 [ %12, %._crit_edge ], [ 0, %1 ], [ %8, %5 ]
  ret i32 %.0
}

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

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #2

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

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 = { 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"}


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