; LLVM IR from tangjz/acm-icpc :: 51nod/1024.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"

@Gcd = external dso_local global [9 x [9 x i32]], align 16
@xUpp = external dso_local global i32, align 4
@yLow = external dso_local global i32, align 4
@yUpp = external dso_local global i32, align 4

; 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
  %6 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  %7 = load i32, ptr %5, align 4, !tbaa !5
  %8 = load i32, ptr @yUpp, align 4, !tbaa !5
  %9 = icmp sgt i32 %7, %8
  br i1 %9, label %10, label %11

10:                                               ; preds = %2
  store i32 0, ptr %3, align 4
  br label %53

11:                                               ; preds = %2
  %12 = load i32, ptr %4, align 4, !tbaa !5
  %13 = load i32, ptr @xUpp, align 4, !tbaa !5
  %14 = icmp eq i32 %12, %13
  br i1 %14, label %15, label %24

15:                                               ; preds = %11
  %16 = load i32, ptr @yUpp, align 4, !tbaa !5
  %17 = load i32, ptr %5, align 4, !tbaa !5
  %18 = sdiv i32 %16, %17
  %19 = load i32, ptr @yLow, align 4, !tbaa !5
  %20 = sub nsw i32 %19, 1
  %21 = load i32, ptr %5, align 4, !tbaa !5
  %22 = sdiv i32 %20, %21
  %23 = sub nsw i32 %18, %22
  store i32 %23, ptr %3, align 4
  br label %53

24:                                               ; preds = %11
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  %25 = load i32, ptr %5, align 4, !tbaa !5
  %26 = load i32, ptr %4, align 4, !tbaa !5
  %27 = srem i32 %25, %26
  store i32 %27, ptr %6, align 4, !tbaa !5
  %28 = load i32, ptr %6, align 4, !tbaa !5
  %29 = icmp ne i32 %28, 0
  br i1 %29, label %30, label %50

30:                                               ; preds = %24
  %31 = load i32, ptr %4, align 4, !tbaa !5
  %32 = add nsw i32 %31, 1
  %33 = load i32, ptr %5, align 4, !tbaa !5
  %34 = call noundef i32 @_Z3dfsii(i32 noundef %32, i32 noundef %33)
  %35 = load i32, ptr %4, align 4, !tbaa !5
  %36 = add nsw i32 %35, 1
  %37 = load i32, ptr %5, align 4, !tbaa !5
  %38 = load i32, ptr %4, align 4, !tbaa !5
  %39 = load i32, ptr %6, align 4, !tbaa !5
  %40 = sext i32 %39 to i64
  %41 = getelementptr inbounds [9 x [9 x i32]], ptr @Gcd, i64 0, i64 %40
  %42 = load i32, ptr %4, align 4, !tbaa !5
  %43 = sext i32 %42 to i64
  %44 = getelementptr inbounds [9 x i32], ptr %41, i64 0, i64 %43
  %45 = load i32, ptr %44, align 4, !tbaa !5
  %46 = sdiv i32 %38, %45
  %47 = mul nsw i32 %37, %46
  %48 = call noundef i32 @_Z3dfsii(i32 noundef %36, i32 noundef %47)
  %49 = sub nsw i32 %34, %48
  br label %51

50:                                               ; preds = %24
  br label %51

51:                                               ; preds = %50, %30
  %52 = phi i32 [ %49, %30 ], [ 0, %50 ]
  store i32 %52, ptr %3, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  br label %53

53:                                               ; preds = %51, %15, %10
  %54 = load i32, ptr %3, 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: 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 = { 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"}


; 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"

@Gcd = external dso_local local_unnamed_addr global [9 x [9 x i32]], align 16
@xUpp = external dso_local local_unnamed_addr global i32, align 4
@yLow = external dso_local local_unnamed_addr global i32, align 4
@yUpp = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: mustprogress nofree nosync nounwind willreturn memory(read, argmem: none, inaccessiblemem: none) uwtable
define dso_local noundef i32 @_Z3dfsii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = load i32, ptr @yUpp, align 4, !tbaa !5
  %4 = icmp slt i32 %3, %1
  br i1 %4, label %common.ret19, label %5

5:                                                ; preds = %2
  %6 = load i32, ptr @xUpp, align 4, !tbaa !5
  %7 = icmp eq i32 %6, %0
  br i1 %7, label %8, label %14

8:                                                ; preds = %5
  %9 = sdiv i32 %3, %1
  %10 = load i32, ptr @yLow, align 4, !tbaa !5
  %11 = add nsw i32 %10, -1
  %12 = sdiv i32 %11, %1
  %13 = sub nsw i32 %9, %12
  br label %common.ret19

14:                                               ; preds = %5
  %15 = srem i32 %1, %0
  %.not = icmp eq i32 %15, 0
  br i1 %.not, label %common.ret19, label %16

common.ret19:                                     ; preds = %14, %2, %8, %16
  %common.ret19.op = phi i32 [ %26, %16 ], [ %13, %8 ], [ 0, %2 ], [ 0, %14 ]
  ret i32 %common.ret19.op

16:                                               ; preds = %14
  %17 = add nsw i32 %0, 1
  %18 = tail call noundef i32 @_Z3dfsii(i32 noundef %17, i32 noundef %1)
  %19 = sext i32 %15 to i64
  %20 = sext i32 %0 to i64
  %21 = getelementptr inbounds [9 x [9 x i32]], ptr @Gcd, i64 0, i64 %19, i64 %20
  %22 = load i32, ptr %21, align 4, !tbaa !5
  %23 = sdiv i32 %0, %22
  %24 = mul nsw i32 %23, %1
  %25 = tail call noundef i32 @_Z3dfsii(i32 noundef %17, i32 noundef %24)
  %26 = sub nsw i32 %18, %25
  br label %common.ret19
}

attributes #0 = { mustprogress nofree nosync nounwind willreturn memory(read, 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