; LLVM IR from lzyrapx/Competitive-Programming :: 51Nod (1264（计算几何）（线段相交）)

; 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::basic_istream" = type { ptr, i64, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }
%struct.line = type { %struct.point, %struct.point }
%struct.point = type { double, double }

@_ZSt3cin = external global %"class.std::basic_istream", align 8
@.str = external hidden unnamed_addr constant [4 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [3 x i8], align 1

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #0

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z12intersect_in4lineS_(ptr noundef byval(%struct.line) align 8, ptr noundef byval(%struct.line) align 8) #1

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #2 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca %struct.line, align 8
  %4 = alloca %struct.line, align 8
  %5 = alloca i32, align 4
  %6 = alloca %struct.line, align 8
  %7 = alloca %struct.line, align 8
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #6
  %8 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) %2)
  call void @llvm.lifetime.start.p0(i64 32, ptr %3) #6
  call void @llvm.lifetime.start.p0(i64 32, ptr %4) #6
  br label %9

9:                                                ; preds = %45, %0
  %10 = load i32, ptr %2, align 4, !tbaa !5
  %11 = add nsw i32 %10, -1
  store i32 %11, ptr %2, align 4, !tbaa !5
  %12 = icmp ne i32 %10, 0
  br i1 %12, label %13, label %46

13:                                               ; preds = %9
  %14 = getelementptr inbounds %struct.line, ptr %3, i32 0, i32 0
  %15 = getelementptr inbounds %struct.point, ptr %14, i32 0, i32 0
  %16 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERd(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 8 dereferenceable(8) %15)
  %17 = getelementptr inbounds %struct.line, ptr %3, i32 0, i32 0
  %18 = getelementptr inbounds %struct.point, ptr %17, i32 0, i32 1
  %19 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERd(ptr noundef nonnull align 8 dereferenceable(16) %16, ptr noundef nonnull align 8 dereferenceable(8) %18)
  %20 = getelementptr inbounds %struct.line, ptr %3, i32 0, i32 1
  %21 = getelementptr inbounds %struct.point, ptr %20, i32 0, i32 0
  %22 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERd(ptr noundef nonnull align 8 dereferenceable(16) %19, ptr noundef nonnull align 8 dereferenceable(8) %21)
  %23 = getelementptr inbounds %struct.line, ptr %3, i32 0, i32 1
  %24 = getelementptr inbounds %struct.point, ptr %23, i32 0, i32 1
  %25 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERd(ptr noundef nonnull align 8 dereferenceable(16) %22, ptr noundef nonnull align 8 dereferenceable(8) %24)
  %26 = getelementptr inbounds %struct.line, ptr %4, i32 0, i32 0
  %27 = getelementptr inbounds %struct.point, ptr %26, i32 0, i32 0
  %28 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERd(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 8 dereferenceable(8) %27)
  %29 = getelementptr inbounds %struct.line, ptr %4, i32 0, i32 0
  %30 = getelementptr inbounds %struct.point, ptr %29, i32 0, i32 1
  %31 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERd(ptr noundef nonnull align 8 dereferenceable(16) %28, ptr noundef nonnull align 8 dereferenceable(8) %30)
  %32 = getelementptr inbounds %struct.line, ptr %4, i32 0, i32 1
  %33 = getelementptr inbounds %struct.point, ptr %32, i32 0, i32 0
  %34 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERd(ptr noundef nonnull align 8 dereferenceable(16) %31, ptr noundef nonnull align 8 dereferenceable(8) %33)
  %35 = getelementptr inbounds %struct.line, ptr %4, i32 0, i32 1
  %36 = getelementptr inbounds %struct.point, ptr %35, i32 0, i32 1
  %37 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERd(ptr noundef nonnull align 8 dereferenceable(16) %34, ptr noundef nonnull align 8 dereferenceable(8) %36)
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #6
  call void @llvm.memcpy.p0.p0.i64(ptr align 8 %6, ptr align 8 %3, i64 32, i1 false), !tbaa.struct !9
  call void @llvm.memcpy.p0.p0.i64(ptr align 8 %7, ptr align 8 %4, i64 32, i1 false), !tbaa.struct !9
  %38 = call noundef i32 @_Z12intersect_in4lineS_(ptr noundef byval(%struct.line) align 8 %6, ptr noundef byval(%struct.line) align 8 %7)
  store i32 %38, ptr %5, align 4, !tbaa !5
  %39 = load i32, ptr %5, align 4, !tbaa !5
  %40 = icmp ne i32 %39, 0
  br i1 %40, label %41, label %43

41:                                               ; preds = %13
  %42 = call i32 @puts(ptr noundef @.str)
  br label %45

43:                                               ; preds = %13
  %44 = call i32 @puts(ptr noundef @.str.1)
  br label %45

45:                                               ; preds = %43, %41
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #6
  br label %9, !llvm.loop !12

46:                                               ; preds = %9
  call void @llvm.lifetime.end.p0(i64 32, ptr %4) #6
  call void @llvm.lifetime.end.p0(i64 32, ptr %3) #6
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #6
  ret i32 0
}

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

declare noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 4 dereferenceable(4)) #4

; Function Attrs: mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERd(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 8 dereferenceable(8)) #5 align 2

declare i32 @puts(ptr noundef) #4

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

attributes #0 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
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" }
attributes #2 = { 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 #3 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #4 = { "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 #5 = { 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 #6 = { 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 = !{i64 0, i64 8, !10, i64 8, i64 8, !10, i64 16, i64 8, !10, i64 24, i64 8, !10}
!10 = !{!11, !11, i64 0}
!11 = !{!"double", !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"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::basic_istream" = type { ptr, i64, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }
%struct.line = type { %struct.point, %struct.point }
%struct.point = type { double, double }

@_ZSt3cin = external global %"class.std::basic_istream", align 8
@.str = external hidden unnamed_addr constant [4 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [3 x i8], align 1

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z12intersect_in4lineS_(ptr noundef byval(%struct.line) align 8, ptr noundef byval(%struct.line) align 8) local_unnamed_addr #0

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #1 {
  %1 = alloca i32, align 4
  %2 = alloca %struct.line, align 8
  %3 = alloca %struct.line, align 8
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #6
  %4 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) %1)
  call void @llvm.lifetime.start.p0(i64 32, ptr nonnull %2) #6
  call void @llvm.lifetime.start.p0(i64 32, ptr nonnull %3) #6
  %5 = load i32, ptr %1, align 4, !tbaa !5
  %6 = add nsw i32 %5, -1
  store i32 %6, ptr %1, align 4, !tbaa !5
  %.not2 = icmp eq i32 %5, 0
  br i1 %.not2, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %0
  %7 = getelementptr inbounds i8, ptr %2, i64 8
  %8 = getelementptr inbounds i8, ptr %2, i64 16
  %9 = getelementptr inbounds i8, ptr %2, i64 24
  %10 = getelementptr inbounds i8, ptr %3, i64 8
  %11 = getelementptr inbounds i8, ptr %3, i64 16
  %12 = getelementptr inbounds i8, ptr %3, i64 24
  br label %13

13:                                               ; preds = %.lr.ph, %13
  %14 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERd(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 8 dereferenceable(8) %2)
  %15 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERd(ptr noundef nonnull align 8 dereferenceable(16) %14, ptr noundef nonnull align 8 dereferenceable(8) %7)
  %16 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERd(ptr noundef nonnull align 8 dereferenceable(16) %15, ptr noundef nonnull align 8 dereferenceable(8) %8)
  %17 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERd(ptr noundef nonnull align 8 dereferenceable(16) %16, ptr noundef nonnull align 8 dereferenceable(8) %9)
  %18 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERd(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 8 dereferenceable(8) %3)
  %19 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERd(ptr noundef nonnull align 8 dereferenceable(16) %18, ptr noundef nonnull align 8 dereferenceable(8) %10)
  %20 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERd(ptr noundef nonnull align 8 dereferenceable(16) %19, ptr noundef nonnull align 8 dereferenceable(8) %11)
  %21 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERd(ptr noundef nonnull align 8 dereferenceable(16) %20, ptr noundef nonnull align 8 dereferenceable(8) %12)
  %22 = call noundef i32 @_Z12intersect_in4lineS_(ptr noundef nonnull byval(%struct.line) align 8 %2, ptr noundef nonnull byval(%struct.line) align 8 %3)
  %.not1 = icmp eq i32 %22, 0
  %.str.1..str = select i1 %.not1, ptr @.str.1, ptr @.str
  %23 = call i32 @puts(ptr noundef nonnull dereferenceable(1) %.str.1..str)
  %24 = load i32, ptr %1, align 4, !tbaa !5
  %25 = add nsw i32 %24, -1
  store i32 %25, ptr %1, align 4, !tbaa !5
  %.not = icmp eq i32 %24, 0
  br i1 %.not, label %._crit_edge, label %13, !llvm.loop !9

._crit_edge:                                      ; preds = %13, %0
  call void @llvm.lifetime.end.p0(i64 32, ptr nonnull %3) #6
  call void @llvm.lifetime.end.p0(i64 32, ptr nonnull %2) #6
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #6
  ret i32 0
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

declare noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #3

; Function Attrs: mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERd(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #4 align 2

; Function Attrs: nofree nounwind
declare noundef i32 @puts(ptr nocapture noundef readonly) local_unnamed_addr #5

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #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" }
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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { "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 = { 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 #5 = { 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 #6 = { 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"}


; Effective O3 passes: DSEPass,EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,MemCpyOptPass,SROAPass,SimplifyCFGPass