; LLVM IR from eyangch/competitive-programming :: CSES/Dynamic_Programming/grid_paths.ll (Z3dfsii)

; 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] }

@MOD = external dso_local global i32, align 4
@N = external dso_local global i32, align 4
@_Z1gB5cxx11 = external dso_local global [1000 x %"class.std::__cxx11::basic_string"], align 16
@dp = external dso_local global [1000 x [1000 x i32]], align 16

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z3dfsii(i32 noundef %0, i32 noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  %6 = load i32, ptr %4, align 4, !tbaa !5
  %7 = icmp slt i32 %6, 0
  br i1 %7, label %29, label %8

8:                                                ; preds = %2
  %9 = load i32, ptr %5, align 4, !tbaa !5
  %10 = icmp slt i32 %9, 0
  br i1 %10, label %29, label %11

11:                                               ; preds = %8
  %12 = load i32, ptr %4, align 4, !tbaa !5
  %13 = load i32, ptr @N, align 4, !tbaa !5
  %14 = icmp sge i32 %12, %13
  br i1 %14, label %29, label %15

15:                                               ; preds = %11
  %16 = load i32, ptr %5, align 4, !tbaa !5
  %17 = load i32, ptr @N, align 4, !tbaa !5
  %18 = icmp sge i32 %16, %17
  br i1 %18, label %29, label %19

19:                                               ; preds = %15
  %20 = load i32, ptr %4, align 4, !tbaa !5
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds [1000 x %"class.std::__cxx11::basic_string"], ptr @_Z1gB5cxx11, i64 0, i64 %21
  %23 = load i32, ptr %5, align 4, !tbaa !5
  %24 = sext i32 %23 to i64
  %25 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %22, i64 noundef %24)
  %26 = load i8, ptr %25, align 1, !tbaa !9
  %27 = sext i8 %26 to i32
  %28 = icmp eq i32 %27, 42
  br i1 %28, label %29, label %30

29:                                               ; preds = %19, %15, %11, %8, %2
  store i32 0, ptr %3, align 4
  br label %74

30:                                               ; preds = %19
  %31 = load i32, ptr %4, align 4, !tbaa !5
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds [1000 x [1000 x i32]], ptr @dp, i64 0, i64 %32
  %34 = load i32, ptr %5, align 4, !tbaa !5
  %35 = sext i32 %34 to i64
  %36 = getelementptr inbounds [1000 x i32], ptr %33, i64 0, i64 %35
  %37 = load i32, ptr %36, align 4, !tbaa !5
  %38 = icmp sge i32 %37, 0
  br i1 %38, label %39, label %47

39:                                               ; preds = %30
  %40 = load i32, ptr %4, align 4, !tbaa !5
  %41 = sext i32 %40 to i64
  %42 = getelementptr inbounds [1000 x [1000 x i32]], ptr @dp, i64 0, i64 %41
  %43 = load i32, ptr %5, align 4, !tbaa !5
  %44 = sext i32 %43 to i64
  %45 = getelementptr inbounds [1000 x i32], ptr %42, i64 0, i64 %44
  %46 = load i32, ptr %45, align 4, !tbaa !5
  store i32 %46, ptr %3, align 4
  br label %74

47:                                               ; preds = %30
  %48 = load i32, ptr %4, align 4, !tbaa !5
  %49 = load i32, ptr %5, align 4, !tbaa !5
  %50 = add nsw i32 %48, %49
  %51 = load i32, ptr @N, align 4, !tbaa !5
  %52 = sub nsw i32 %51, 1
  %53 = mul nsw i32 2, %52
  %54 = icmp eq i32 %50, %53
  %55 = zext i1 %54 to i32
  %56 = load i32, ptr %4, align 4, !tbaa !5
  %57 = add nsw i32 %56, 1
  %58 = load i32, ptr %5, align 4, !tbaa !5
  %59 = call noundef i32 @_Z3dfsii(i32 noundef %57, i32 noundef %58)
  %60 = add nsw i32 %55, %59
  %61 = load i32, ptr %4, align 4, !tbaa !5
  %62 = load i32, ptr %5, align 4, !tbaa !5
  %63 = add nsw i32 %62, 1
  %64 = call noundef i32 @_Z3dfsii(i32 noundef %61, i32 noundef %63)
  %65 = add nsw i32 %60, %64
  %66 = load i32, ptr @MOD, align 4, !tbaa !5
  %67 = srem i32 %65, %66
  %68 = load i32, ptr %4, align 4, !tbaa !5
  %69 = sext i32 %68 to i64
  %70 = getelementptr inbounds [1000 x [1000 x i32]], ptr @dp, i64 0, i64 %69
  %71 = load i32, ptr %5, align 4, !tbaa !5
  %72 = sext i32 %71 to i64
  %73 = getelementptr inbounds [1000 x i32], ptr %70, i64 0, i64 %72
  store i32 %67, ptr %73, align 4, !tbaa !5
  store i32 %67, ptr %3, align 4
  br label %74

74:                                               ; preds = %47, %39, %29
  %75 = load i32, ptr %3, align 4
  ret i32 %75
}

; 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) #1 align 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 = { 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" }

!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}


; 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] }

@MOD = external dso_local local_unnamed_addr global i32, align 4
@N = external dso_local local_unnamed_addr global i32, align 4
@_Z1gB5cxx11 = external dso_local global [1000 x %"class.std::__cxx11::basic_string"], align 16
@dp = external dso_local local_unnamed_addr global [1000 x [1000 x i32]], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef range(i32 0, -2147483648) i32 @_Z3dfsii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = or i32 %1, %0
  %or.cond.not = icmp sgt i32 %3, -1
  br i1 %or.cond.not, label %4, label %common.ret25

4:                                                ; preds = %2
  %5 = load i32, ptr @N, align 4, !tbaa !5
  %.not = icmp sgt i32 %5, %0
  %.not24 = icmp sgt i32 %5, %1
  %or.cond = and i1 %.not, %.not24
  br i1 %or.cond, label %6, label %common.ret25

6:                                                ; preds = %4
  %7 = zext nneg i32 %0 to i64
  %8 = getelementptr inbounds [1000 x %"class.std::__cxx11::basic_string"], ptr @_Z1gB5cxx11, i64 0, i64 %7
  %9 = zext nneg i32 %1 to i64
  %10 = tail call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %8, i64 noundef %9)
  %11 = load i8, ptr %10, align 1, !tbaa !9
  %12 = icmp eq i8 %11, 42
  br i1 %12, label %common.ret25, label %13

13:                                               ; preds = %6
  %14 = getelementptr inbounds [1000 x [1000 x i32]], ptr @dp, i64 0, i64 %7, i64 %9
  %15 = load i32, ptr %14, align 4, !tbaa !5
  %16 = icmp sgt i32 %15, -1
  br i1 %16, label %common.ret25, label %17

common.ret25:                                     ; preds = %13, %2, %4, %6, %17
  %common.ret25.op = phi i32 [ %31, %17 ], [ 0, %6 ], [ 0, %4 ], [ 0, %2 ], [ %15, %13 ]
  ret i32 %common.ret25.op

17:                                               ; preds = %13
  %18 = add nuw nsw i32 %1, %0
  %19 = load i32, ptr @N, align 4, !tbaa !5
  %20 = shl i32 %19, 1
  %21 = add i32 %20, -2
  %22 = icmp eq i32 %18, %21
  %23 = zext i1 %22 to i32
  %24 = add nuw nsw i32 %0, 1
  %25 = tail call noundef i32 @_Z3dfsii(i32 noundef %24, i32 noundef %1)
  %26 = add nuw nsw i32 %1, 1
  %27 = tail call noundef i32 @_Z3dfsii(i32 noundef %0, i32 noundef %26)
  %28 = add nuw nsw i32 %27, %25
  %29 = add nuw nsw i32 %28, %23
  %30 = load i32, ptr @MOD, align 4, !tbaa !5
  %31 = srem i32 %29, %30
  store i32 %31, ptr %14, align 4, !tbaa !5
  br label %common.ret25
}

; 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

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" }

!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}


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