; LLVM IR from brpapa/algorithms :: solutions/uva/547.ll (Z2dpi)

; 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"

@f = external dso_local global [3030 x i32], align 16
@memo = external dso_local global [3030 x i32], align 16

; 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: mustprogress uwtable
define dso_local noundef i32 @_Z2dpi(i32 noundef %0) #1 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  %6 = load i32, ptr %3, align 4, !tbaa !5
  %7 = sext i32 %6 to i64
  %8 = getelementptr inbounds [3030 x i32], ptr @memo, i64 0, i64 %7
  store ptr %8, ptr %4, align 8, !tbaa !9
  %9 = load ptr, ptr %4, align 8, !tbaa !9
  %10 = load i32, ptr %9, align 4, !tbaa !5
  %11 = icmp ne i32 %10, -1
  br i1 %11, label %12, label %15

12:                                               ; preds = %1
  %13 = load ptr, ptr %4, align 8, !tbaa !9
  %14 = load i32, ptr %13, align 4, !tbaa !5
  store i32 %14, ptr %2, align 4
  store i32 1, ptr %5, align 4
  br label %31

15:                                               ; preds = %1
  %16 = load i32, ptr %3, align 4, !tbaa !5
  %17 = load i32, ptr %3, align 4, !tbaa !5
  %18 = sext i32 %17 to i64
  %19 = getelementptr inbounds [3030 x i32], ptr @f, i64 0, i64 %18
  %20 = load i32, ptr %19, align 4, !tbaa !5
  %21 = icmp eq i32 %16, %20
  br i1 %21, label %22, label %23

22:                                               ; preds = %15
  store i32 1, ptr %2, align 4
  store i32 1, ptr %5, align 4
  br label %31

23:                                               ; preds = %15
  %24 = load i32, ptr %3, align 4, !tbaa !5
  %25 = sext i32 %24 to i64
  %26 = getelementptr inbounds [3030 x i32], ptr @f, i64 0, i64 %25
  %27 = load i32, ptr %26, align 4, !tbaa !5
  %28 = call noundef i32 @_Z2dpi(i32 noundef %27)
  %29 = add nsw i32 1, %28
  %30 = load ptr, ptr %4, align 8, !tbaa !9
  store i32 %29, ptr %30, align 4, !tbaa !5
  store i32 %29, ptr %2, align 4
  store i32 1, ptr %5, align 4
  br label %31

31:                                               ; preds = %23, %22, %12
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  %32 = load i32, ptr %2, align 4
  ret i32 %32
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !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"

@f = external dso_local local_unnamed_addr global [3030 x i32], align 16
@memo = external dso_local local_unnamed_addr global [3030 x i32], align 16

; Function Attrs: mustprogress nofree nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: none) uwtable
define dso_local noundef i32 @_Z2dpi(i32 noundef %0) local_unnamed_addr #0 {
  %2 = sext i32 %0 to i64
  %3 = getelementptr inbounds [3030 x i32], ptr @memo, i64 0, i64 %2
  %4 = load i32, ptr %3, align 4, !tbaa !5
  %.not = icmp eq i32 %4, -1
  br i1 %.not, label %5, label %common.ret9

5:                                                ; preds = %1
  %6 = getelementptr inbounds [3030 x i32], ptr @f, i64 0, i64 %2
  %7 = load i32, ptr %6, align 4, !tbaa !5
  %8 = icmp eq i32 %7, %0
  br i1 %8, label %common.ret9, label %9

common.ret9:                                      ; preds = %5, %1, %9
  %common.ret9.op = phi i32 [ %11, %9 ], [ %4, %1 ], [ 1, %5 ]
  ret i32 %common.ret9.op

9:                                                ; preds = %5
  %10 = tail call noundef i32 @_Z2dpi(i32 noundef %7)
  %11 = add nsw i32 %10, 1
  store i32 %11, ptr %3, align 4, !tbaa !5
  br label %common.ret9
}

attributes #0 = { mustprogress nofree nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: none) 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++ TBAA"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass