; LLVM IR from eyangch/competitive-programming :: Codeforces/1132/f.ll (Z3dpfii)

; 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"

%"class.std::__cxx11::basic_string" = type { %"struct.std::__cxx11::basic_string<char>::_Alloc_hider", i64, %union.anon }
%"struct.std::__cxx11::basic_string<char>::_Alloc_hider" = type { ptr }
%union.anon = type { i64, [8 x i8] }

@dp = external dso_local global [500 x [500 x i32]], align 16
@_Z1sB5cxx11 = external dso_local global %"class.std::__cxx11::basic_string", align 8

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z3dpfii(i32 noundef %0, i32 noundef %1) #0 {
  %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
  %8 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  %9 = load i32, ptr %4, align 4, !tbaa !5
  %10 = load i32, ptr %5, align 4, !tbaa !5
  %11 = icmp eq i32 %9, %10
  br i1 %11, label %12, label %13

12:                                               ; preds = %2
  store i32 1, ptr %3, align 4
  br label %83

13:                                               ; preds = %2
  %14 = load i32, ptr %4, align 4, !tbaa !5
  %15 = load i32, ptr %5, align 4, !tbaa !5
  %16 = icmp sgt i32 %14, %15
  br i1 %16, label %17, label %18

17:                                               ; preds = %13
  store i32 0, ptr %3, align 4
  br label %83

18:                                               ; preds = %13
  %19 = load i32, ptr %4, align 4, !tbaa !5
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds [500 x [500 x i32]], ptr @dp, i64 0, i64 %20
  %22 = load i32, ptr %5, align 4, !tbaa !5
  %23 = sext i32 %22 to i64
  %24 = getelementptr inbounds [500 x i32], ptr %21, i64 0, i64 %23
  %25 = load i32, ptr %24, align 4, !tbaa !5
  %26 = icmp sgt i32 %25, 0
  br i1 %26, label %27, label %35

27:                                               ; preds = %18
  %28 = load i32, ptr %4, align 4, !tbaa !5
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds [500 x [500 x i32]], ptr @dp, i64 0, i64 %29
  %31 = load i32, ptr %5, align 4, !tbaa !5
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds [500 x i32], ptr %30, i64 0, i64 %32
  %34 = load i32, ptr %33, align 4, !tbaa !5
  store i32 %34, ptr %3, align 4
  br label %83

35:                                               ; preds = %18
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #4
  %36 = load i32, ptr %4, align 4, !tbaa !5
  %37 = load i32, ptr %5, align 4, !tbaa !5
  %38 = sub nsw i32 %37, 1
  %39 = call noundef i32 @_Z3dpfii(i32 noundef %36, i32 noundef %38)
  %40 = add nsw i32 %39, 1
  store i32 %40, ptr %6, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #4
  %41 = load i32, ptr %4, align 4, !tbaa !5
  store i32 %41, ptr %7, align 4, !tbaa !5
  br label %42

42:                                               ; preds = %72, %35
  %43 = load i32, ptr %7, align 4, !tbaa !5
  %44 = load i32, ptr %5, align 4, !tbaa !5
  %45 = icmp slt i32 %43, %44
  br i1 %45, label %47, label %46

46:                                               ; preds = %42
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #4
  br label %75

47:                                               ; preds = %42
  %48 = load i32, ptr %7, align 4, !tbaa !5
  %49 = sext i32 %48 to i64
  %50 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) @_Z1sB5cxx11, i64 noundef %49)
  %51 = load i8, ptr %50, align 1, !tbaa !9
  %52 = sext i8 %51 to i32
  %53 = load i32, ptr %5, align 4, !tbaa !5
  %54 = sext i32 %53 to i64
  %55 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) @_Z1sB5cxx11, i64 noundef %54)
  %56 = load i8, ptr %55, align 1, !tbaa !9
  %57 = sext i8 %56 to i32
  %58 = icmp eq i32 %52, %57
  br i1 %58, label %59, label %71

59:                                               ; preds = %47
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #4
  %60 = load i32, ptr %4, align 4, !tbaa !5
  %61 = load i32, ptr %7, align 4, !tbaa !5
  %62 = call noundef i32 @_Z3dpfii(i32 noundef %60, i32 noundef %61)
  %63 = load i32, ptr %7, align 4, !tbaa !5
  %64 = add nsw i32 %63, 1
  %65 = load i32, ptr %5, align 4, !tbaa !5
  %66 = sub nsw i32 %65, 1
  %67 = call noundef i32 @_Z3dpfii(i32 noundef %64, i32 noundef %66)
  %68 = add nsw i32 %62, %67
  store i32 %68, ptr %8, align 4, !tbaa !5
  %69 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %8, ptr noundef nonnull align 4 dereferenceable(4) %6)
  %70 = load i32, ptr %69, align 4, !tbaa !5
  store i32 %70, ptr %6, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #4
  br label %71

71:                                               ; preds = %59, %47
  br label %72

72:                                               ; preds = %71
  %73 = load i32, ptr %7, align 4, !tbaa !5
  %74 = add nsw i32 %73, 1
  store i32 %74, ptr %7, align 4, !tbaa !5
  br label %42, !llvm.loop !10

75:                                               ; preds = %46
  %76 = load i32, ptr %6, align 4, !tbaa !5
  %77 = load i32, ptr %4, align 4, !tbaa !5
  %78 = sext i32 %77 to i64
  %79 = getelementptr inbounds [500 x [500 x i32]], ptr @dp, i64 0, i64 %78
  %80 = load i32, ptr %5, align 4, !tbaa !5
  %81 = sext i32 %80 to i64
  %82 = getelementptr inbounds [500 x i32], ptr %79, i64 0, i64 %81
  store i32 %76, ptr %82, align 4, !tbaa !5
  store i32 %76, ptr %3, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #4
  br label %83

83:                                               ; preds = %75, %27, %17, %12
  %84 = load i32, ptr %3, align 4
  ret i32 %84
}

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

; Function Attrs: mustprogress nounwind uwtable
declare noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32), i64 noundef) #2 align 2

; 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)) #3

; 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 = { 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 = { 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 #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 = !{!7, !7, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"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"

%"class.std::__cxx11::basic_string" = type { %"struct.std::__cxx11::basic_string<char>::_Alloc_hider", i64, %union.anon }
%"struct.std::__cxx11::basic_string<char>::_Alloc_hider" = type { ptr }
%union.anon = type { i64, [8 x i8] }

@dp = external dso_local local_unnamed_addr global [500 x [500 x i32]], align 16
@_Z1sB5cxx11 = external dso_local global %"class.std::__cxx11::basic_string", align 8

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z3dpfii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = icmp eq i32 %0, %1
  br i1 %5, label %35, label %6

6:                                                ; preds = %2
  %7 = icmp sgt i32 %0, %1
  br i1 %7, label %35, label %8

8:                                                ; preds = %6
  %9 = sext i32 %0 to i64
  %10 = sext i32 %1 to i64
  %11 = getelementptr inbounds [500 x [500 x i32]], ptr @dp, i64 0, i64 %9, i64 %10
  %12 = load i32, ptr %11, align 4, !tbaa !5
  %13 = icmp sgt i32 %12, 0
  br i1 %13, label %35, label %14

14:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %3) #3
  %15 = add nsw i32 %1, -1
  %16 = tail call noundef i32 @_Z3dpfii(i32 noundef %0, i32 noundef %15)
  %17 = add nsw i32 %16, 1
  store i32 %17, ptr %3, align 4, !tbaa !5
  %18 = icmp slt i32 %0, %1
  br i1 %18, label %.lr.ph, label %._crit_edge

._crit_edge.loopexit:                             ; preds = %34
  %.pre = load i32, ptr %3, align 4, !tbaa !5
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %14
  %19 = phi i32 [ %.pre, %._crit_edge.loopexit ], [ %17, %14 ]
  store i32 %19, ptr %11, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %3) #3
  br label %35

.lr.ph:                                           ; preds = %14, %34
  %indvars.iv = phi i64 [ %indvars.iv.next.pre-phi, %34 ], [ %9, %14 ]
  %20 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) @_Z1sB5cxx11, i64 noundef %indvars.iv)
  %21 = load i8, ptr %20, align 1, !tbaa !9
  %22 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) @_Z1sB5cxx11, i64 noundef %10)
  %23 = load i8, ptr %22, align 1, !tbaa !9
  %24 = icmp eq i8 %21, %23
  br i1 %24, label %25, label %.lr.ph._crit_edge

.lr.ph._crit_edge:                                ; preds = %.lr.ph
  %.pre29 = add nsw i64 %indvars.iv, 1
  %.pre30 = trunc i64 %.pre29 to i32
  br label %34

25:                                               ; preds = %.lr.ph
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %4) #3
  %26 = trunc nsw i64 %indvars.iv to i32
  %27 = call noundef i32 @_Z3dpfii(i32 noundef %0, i32 noundef %26)
  %28 = add nsw i64 %indvars.iv, 1
  %29 = trunc i64 %28 to i32
  %30 = call noundef i32 @_Z3dpfii(i32 noundef %29, i32 noundef %15)
  %31 = add nsw i32 %30, %27
  store i32 %31, ptr %4, align 4, !tbaa !5
  %32 = 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) %3)
  %33 = load i32, ptr %32, align 4, !tbaa !5
  store i32 %33, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %4) #3
  br label %34

34:                                               ; preds = %.lr.ph._crit_edge, %25
  %lftr.wideiv.pre-phi = phi i32 [ %.pre30, %.lr.ph._crit_edge ], [ %29, %25 ]
  %indvars.iv.next.pre-phi = phi i64 [ %.pre29, %.lr.ph._crit_edge ], [ %28, %25 ]
  %exitcond.not = icmp eq i32 %lftr.wideiv.pre-phi, %1
  br i1 %exitcond.not, label %._crit_edge.loopexit, label %.lr.ph, !llvm.loop !10

35:                                               ; preds = %8, %6, %2, %._crit_edge
  %.023 = phi i32 [ %19, %._crit_edge ], [ 1, %2 ], [ 0, %6 ], [ %12, %8 ]
  ret i32 %.023
}

; 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 nounwind uwtable
declare noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32), i64 noundef) local_unnamed_addr #0 align 2

; 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 = !{!7, !7, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass