; LLVM IR from tangjz/acm-icpc :: hdu/5760.ll (Z5mergeRSt4pairIiiES0_)

; 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.std::pair" = type { i32, i32 }

; Function Attrs: mustprogress uwtable
define dso_local void @_Z5mergeRSt4pairIiiES0_(ptr noundef nonnull align 4 dereferenceable(8) %0, i64 %1) #0 {
  %3 = alloca %"struct.std::pair", align 4
  %4 = alloca ptr, align 8
  store i64 %1, ptr %3, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  %5 = load ptr, ptr %4, align 8, !tbaa !5
  %6 = getelementptr inbounds %"struct.std::pair", ptr %5, i32 0, i32 0
  %7 = load i32, ptr %6, align 4, !tbaa !9
  %8 = getelementptr inbounds %"struct.std::pair", ptr %3, i32 0, i32 0
  %9 = load i32, ptr %8, align 4, !tbaa !9
  %10 = icmp slt i32 %7, %9
  br i1 %10, label %11, label %14

11:                                               ; preds = %2
  %12 = load ptr, ptr %4, align 8, !tbaa !5
  %13 = call noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt4pairIiiEaSERKS0_(ptr noundef nonnull align 4 dereferenceable(8) %12, ptr noundef nonnull align 4 dereferenceable(8) %3)
  br label %38

14:                                               ; preds = %2
  %15 = load ptr, ptr %4, align 8, !tbaa !5
  %16 = getelementptr inbounds %"struct.std::pair", ptr %15, i32 0, i32 0
  %17 = load i32, ptr %16, align 4, !tbaa !9
  %18 = getelementptr inbounds %"struct.std::pair", ptr %3, i32 0, i32 0
  %19 = load i32, ptr %18, align 4, !tbaa !9
  %20 = icmp eq i32 %17, %19
  br i1 %20, label %21, label %37

21:                                               ; preds = %14
  %22 = getelementptr inbounds %"struct.std::pair", ptr %3, i32 0, i32 1
  %23 = load i32, ptr %22, align 4, !tbaa !12
  %24 = load ptr, ptr %4, align 8, !tbaa !5
  %25 = getelementptr inbounds %"struct.std::pair", ptr %24, i32 0, i32 1
  %26 = load i32, ptr %25, align 4, !tbaa !12
  %27 = add nsw i32 %26, %23
  store i32 %27, ptr %25, align 4, !tbaa !12
  %28 = icmp sge i32 %27, 1000000007
  br i1 %28, label %29, label %35

29:                                               ; preds = %21
  %30 = load ptr, ptr %4, align 8, !tbaa !5
  %31 = getelementptr inbounds %"struct.std::pair", ptr %30, i32 0, i32 1
  %32 = load i32, ptr %31, align 4, !tbaa !12
  %33 = sub nsw i32 %32, 1000000007
  store i32 %33, ptr %31, align 4, !tbaa !12
  %34 = icmp ne i32 %33, 0
  br label %35

35:                                               ; preds = %29, %21
  %36 = phi i1 [ false, %21 ], [ %34, %29 ]
  br label %37

37:                                               ; preds = %35, %14
  br label %38

38:                                               ; preds = %37, %11
  ret void
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt4pairIiiEaSERKS0_(ptr noundef nonnull align 4 dereferenceable(8), ptr noundef nonnull align 4 dereferenceable(8)) #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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !11, i64 0}
!10 = !{!"_ZTSSt4pairIiiE", !11, i64 0, !11, i64 4}
!11 = !{!"int", !7, i64 0}
!12 = !{!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"

%"struct.std::pair" = type { i32, i32 }

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z5mergeRSt4pairIiiES0_(ptr noundef nonnull align 4 dereferenceable(8) %0, i64 %1) local_unnamed_addr #0 {
  %3 = alloca %"struct.std::pair", align 8
  store i64 %1, ptr %3, align 8
  %4 = load i32, ptr %0, align 4, !tbaa !5
  %5 = trunc i64 %1 to i32
  %6 = icmp slt i32 %4, %5
  %7 = lshr i64 %1, 32
  %8 = trunc nuw i64 %7 to i32
  br i1 %6, label %9, label %11

9:                                                ; preds = %2
  %10 = call noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt4pairIiiEaSERKS0_(ptr noundef nonnull align 4 dereferenceable(8) %0, ptr noundef nonnull align 4 dereferenceable(8) %3)
  br label %20

11:                                               ; preds = %2
  %12 = icmp eq i32 %4, %5
  br i1 %12, label %13, label %20

13:                                               ; preds = %11
  %14 = getelementptr inbounds i8, ptr %0, i64 4
  %15 = load i32, ptr %14, align 4, !tbaa !10
  %16 = add nsw i32 %15, %8
  store i32 %16, ptr %14, align 4, !tbaa !10
  %17 = icmp sgt i32 %16, 1000000006
  br i1 %17, label %18, label %20

18:                                               ; preds = %13
  %19 = add nsw i32 %16, -1000000007
  store i32 %19, ptr %14, align 4, !tbaa !10
  br label %20

20:                                               ; preds = %11, %18, %13, %9
  ret void
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt4pairIiiEaSERKS0_(ptr noundef nonnull align 4 dereferenceable(8), ptr noundef nonnull align 4 dereferenceable(8)) 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, !7, i64 0}
!6 = !{!"_ZTSSt4pairIiiE", !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: BDCEPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InferAlignmentPass,InstCombinePass,PostOrderFunctionAttrsPass,SCCPPass,SROAPass,SimplifyCFGPass