; LLVM IR from lzyrapx/Competitive-Programming :: HDUOJ (1577)

; 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"

@l = external dso_local global i32, align 4
@sx = external dso_local global i32, align 4
@sy = external dso_local global i32, align 4
@px = external dso_local global i32, align 4
@py = external dso_local global i32, align 4
@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [9 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [13 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [4 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [3 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local noundef i32 @_Z3gcdii(i32 noundef, i32 noundef) #0

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #1 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  br label %6

6:                                                ; preds = %45, %43, %0
  %7 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @l)
  %8 = xor i32 %7, -1
  %9 = load i32, ptr @l, align 4, !tbaa !5
  %10 = icmp ne i32 %9, 0
  br i1 %10, label %11, label %46

11:                                               ; preds = %6
  %12 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.1, ptr noundef @sx, ptr noundef @sy, ptr noundef @px, ptr noundef @py)
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #5
  %13 = load i32, ptr @sx, align 4, !tbaa !5
  %14 = load i32, ptr @px, align 4, !tbaa !5
  %15 = sub nsw i32 %13, %14
  %16 = call i32 @llvm.abs.i32(i32 %15, i1 true)
  store i32 %16, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #5
  %17 = load i32, ptr @sy, align 4, !tbaa !5
  %18 = load i32, ptr @py, align 4, !tbaa !5
  %19 = sub nsw i32 %17, %18
  %20 = call i32 @llvm.abs.i32(i32 %19, i1 true)
  store i32 %20, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #5
  %21 = load i32, ptr %2, align 4, !tbaa !5
  %22 = load i32, ptr %3, align 4, !tbaa !5
  %23 = call noundef i32 @_Z3gcdii(i32 noundef %21, i32 noundef %22)
  store i32 %23, ptr %4, align 4, !tbaa !5
  %24 = load i32, ptr @px, align 4, !tbaa !5
  %25 = call i32 @llvm.abs.i32(i32 %24, i1 true)
  %26 = load i32, ptr @l, align 4, !tbaa !5
  %27 = icmp sgt i32 %25, %26
  br i1 %27, label %33, label %28

28:                                               ; preds = %11
  %29 = load i32, ptr @py, align 4, !tbaa !5
  %30 = call i32 @llvm.abs.i32(i32 %29, i1 true)
  %31 = load i32, ptr @l, align 4, !tbaa !5
  %32 = icmp sgt i32 %30, %31
  br i1 %32, label %33, label %35

33:                                               ; preds = %28, %11
  %34 = call i32 @puts(ptr noundef @.str.2)
  store i32 2, ptr %5, align 4
  br label %43, !llvm.loop !9

35:                                               ; preds = %28
  %36 = load i32, ptr %4, align 4, !tbaa !5
  %37 = icmp eq i32 %36, 1
  br i1 %37, label %38, label %40

38:                                               ; preds = %35
  %39 = call i32 @puts(ptr noundef @.str.3)
  br label %42

40:                                               ; preds = %35
  %41 = call i32 @puts(ptr noundef @.str.4)
  br label %42

42:                                               ; preds = %40, %38
  store i32 0, ptr %5, align 4
  br label %43

43:                                               ; preds = %42, %33
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #5
  %44 = load i32, ptr %5, align 4
  switch i32 %44, label %47 [
    i32 0, label %45
    i32 2, label %6
  ]

45:                                               ; preds = %43
  br label %6, !llvm.loop !9

46:                                               ; preds = %6
  ret i32 0

47:                                               ; preds = %43
  unreachable
}

declare i32 @__isoc99_scanf(ptr noundef, ...) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #3

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.abs.i32(i32, i1 immarg) #4

declare i32 @puts(ptr noundef) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #3

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 norecurse 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 = { "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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #4 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
attributes #5 = { 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"

@l = external dso_local global i32, align 4
@sx = external dso_local global i32, align 4
@sy = external dso_local global i32, align 4
@px = external dso_local global i32, align 4
@py = external dso_local global i32, align 4
@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [9 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [13 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [4 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [3 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local noundef i32 @_Z3gcdii(i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #1 {
  %1 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @l)
  %2 = load i32, ptr @l, align 4, !tbaa !5
  %.not3 = icmp eq i32 %2, 0
  br i1 %.not3, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %0, %23
  %3 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.1, ptr noundef nonnull @sx, ptr noundef nonnull @sy, ptr noundef nonnull @px, ptr noundef nonnull @py)
  %4 = load i32, ptr @sx, align 4, !tbaa !5
  %5 = load i32, ptr @px, align 4, !tbaa !5
  %6 = sub nsw i32 %4, %5
  %7 = tail call i32 @llvm.abs.i32(i32 %6, i1 true)
  %8 = load i32, ptr @sy, align 4, !tbaa !5
  %9 = load i32, ptr @py, align 4, !tbaa !5
  %10 = sub nsw i32 %8, %9
  %11 = tail call i32 @llvm.abs.i32(i32 %10, i1 true)
  %12 = tail call noundef i32 @_Z3gcdii(i32 noundef %7, i32 noundef %11)
  %13 = load i32, ptr @px, align 4, !tbaa !5
  %14 = tail call i32 @llvm.abs.i32(i32 %13, i1 true)
  %15 = load i32, ptr @l, align 4, !tbaa !5
  %16 = icmp sgt i32 %14, %15
  br i1 %16, label %23, label %17, !llvm.loop !9

17:                                               ; preds = %.lr.ph
  %18 = load i32, ptr @py, align 4, !tbaa !5
  %19 = tail call i32 @llvm.abs.i32(i32 %18, i1 true)
  %20 = icmp ugt i32 %19, %15
  br i1 %20, label %23, label %21, !llvm.loop !9

21:                                               ; preds = %17
  %22 = icmp eq i32 %12, 1
  %.str.3..str.4 = select i1 %22, ptr @.str.3, ptr @.str.4
  br label %23

23:                                               ; preds = %21, %.lr.ph, %17
  %.str.3.sink = phi ptr [ @.str.2, %17 ], [ @.str.2, %.lr.ph ], [ %.str.3..str.4, %21 ]
  %24 = tail call i32 @puts(ptr noundef nonnull dereferenceable(1) %.str.3.sink)
  %25 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @l)
  %26 = load i32, ptr @l, align 4, !tbaa !5
  %.not = icmp eq i32 %26, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %23, %0
  ret i32 0
}

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

; Function Attrs: mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.abs.i32(i32, i1 immarg) #3

; Function Attrs: nofree nounwind
declare noundef i32 @puts(ptr nocapture noundef readonly) local_unnamed_addr #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 norecurse 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 = { nofree nounwind "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 = { mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none) }

!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: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass