; LLVM IR from lzyrapx/Competitive-Programming :: Retired_code/CDQ Divide and Conquer/HDU 4742（三维偏序）.ll (Z6getmaxR2DPS0_)

; 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"

%struct.DP = type { i32, i32 }

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z6getmaxR2DPS0_(ptr noundef nonnull align 4 dereferenceable(8) %0, ptr noundef nonnull align 4 dereferenceable(8) %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !5
  %5 = load ptr, ptr %3, align 8, !tbaa !5
  %6 = getelementptr inbounds %struct.DP, ptr %5, i32 0, i32 0
  %7 = load i32, ptr %6, align 4, !tbaa !9
  %8 = load ptr, ptr %4, align 8, !tbaa !5
  %9 = getelementptr inbounds %struct.DP, ptr %8, i32 0, i32 0
  %10 = load i32, ptr %9, align 4, !tbaa !9
  %11 = icmp slt i32 %7, %10
  br i1 %11, label %12, label %15

12:                                               ; preds = %2
  %13 = load ptr, ptr %4, align 8, !tbaa !5
  %14 = load ptr, ptr %3, align 8, !tbaa !5
  call void @llvm.memcpy.p0.p0.i64(ptr align 4 %14, ptr align 4 %13, i64 8, i1 false), !tbaa.struct !12
  br label %37

15:                                               ; preds = %2
  %16 = load ptr, ptr %3, align 8, !tbaa !5
  %17 = getelementptr inbounds %struct.DP, ptr %16, i32 0, i32 0
  %18 = load i32, ptr %17, align 4, !tbaa !9
  %19 = load ptr, ptr %4, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.DP, ptr %19, i32 0, i32 0
  %21 = load i32, ptr %20, align 4, !tbaa !9
  %22 = icmp eq i32 %18, %21
  br i1 %22, label %23, label %36

23:                                               ; preds = %15
  %24 = load ptr, ptr %4, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.DP, ptr %24, i32 0, i32 1
  %26 = load i32, ptr %25, align 4, !tbaa !14
  %27 = srem i32 %26, 1073741824
  %28 = load ptr, ptr %3, align 8, !tbaa !5
  %29 = getelementptr inbounds %struct.DP, ptr %28, i32 0, i32 1
  %30 = load i32, ptr %29, align 4, !tbaa !14
  %31 = add nsw i32 %30, %27
  store i32 %31, ptr %29, align 4, !tbaa !14
  %32 = load ptr, ptr %3, align 8, !tbaa !5
  %33 = getelementptr inbounds %struct.DP, ptr %32, i32 0, i32 1
  %34 = load i32, ptr %33, align 4, !tbaa !14
  %35 = srem i32 %34, 1073741824
  store i32 %35, ptr %33, align 4, !tbaa !14
  br label %36

36:                                               ; preds = %23, %15
  br label %37

37:                                               ; preds = %36, %12
  ret void
}

; 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) #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 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }

!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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !11, i64 0}
!10 = !{!"_ZTS2DP", !11, i64 0, !11, i64 4}
!11 = !{!"int", !7, i64 0}
!12 = !{i64 0, i64 4, !13, i64 4, i64 4, !13}
!13 = !{!11, !11, i64 0}
!14 = !{!10, !11, i64 4}


; 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"

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: readwrite) uwtable
define dso_local void @_Z6getmaxR2DPS0_(ptr nocapture noundef nonnull align 4 dereferenceable(8) %0, ptr nocapture noundef nonnull readonly align 4 dereferenceable(8) %1) local_unnamed_addr #0 {
  %3 = load i32, ptr %0, align 4, !tbaa !5
  %4 = load i32, ptr %1, align 4, !tbaa !5
  %5 = icmp slt i32 %3, %4
  br i1 %5, label %6, label %8

6:                                                ; preds = %2
  %7 = load i64, ptr %1, align 4
  store i64 %7, ptr %0, align 4
  br label %18

8:                                                ; preds = %2
  %9 = icmp eq i32 %3, %4
  br i1 %9, label %10, label %18

10:                                               ; preds = %8
  %11 = getelementptr inbounds i8, ptr %1, i64 4
  %12 = load i32, ptr %11, align 4, !tbaa !10
  %13 = srem i32 %12, 1073741824
  %14 = getelementptr inbounds i8, ptr %0, i64 4
  %15 = load i32, ptr %14, align 4, !tbaa !10
  %16 = add nsw i32 %15, %13
  %17 = srem i32 %16, 1073741824
  store i32 %17, ptr %14, align 4, !tbaa !10
  br label %18

18:                                               ; preds = %8, %10, %6
  ret void
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: readwrite) 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, !7, i64 0}
!6 = !{!"_ZTS2DP", !7, i64 0, !7, i64 4}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!6, !7, i64 4}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass