; LLVM IR from kazunetakahashi/atcoder :: 2018/0311_ARC091/C.ll (Z3ansv)

; 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"

@N = external dso_local global i64, align 8
@M = external dso_local global i64, align 8

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_Z3ansv() #0 {
  %1 = alloca i64, align 8
  %2 = load i64, ptr @N, align 8, !tbaa !5
  %3 = load i64, ptr @M, align 8, !tbaa !5
  %4 = icmp sgt i64 %2, %3
  br i1 %4, label %5, label %6

5:                                                ; preds = %0
  call void @_ZSt4swapIxENSt9enable_ifIXsr6__and_ISt6__not_ISt15__is_tuple_likeIT_EESt21is_move_constructibleIS3_ESt18is_move_assignableIS3_EEE5valueEvE4typeERS3_SC_(ptr noundef nonnull align 8 dereferenceable(8) @N, ptr noundef nonnull align 8 dereferenceable(8) @M) #2
  br label %6

6:                                                ; preds = %5, %0
  %7 = load i64, ptr @N, align 8, !tbaa !5
  %8 = icmp eq i64 %7, 1
  br i1 %8, label %9, label %20

9:                                                ; preds = %6
  %10 = load i64, ptr @M, align 8, !tbaa !5
  %11 = icmp eq i64 %10, 1
  br i1 %11, label %12, label %13

12:                                               ; preds = %9
  store i64 1, ptr %1, align 8
  br label %35

13:                                               ; preds = %9
  %14 = load i64, ptr @M, align 8, !tbaa !5
  %15 = icmp eq i64 %14, 2
  br i1 %15, label %16, label %17

16:                                               ; preds = %13
  store i64 0, ptr %1, align 8
  br label %35

17:                                               ; preds = %13
  %18 = load i64, ptr @M, align 8, !tbaa !5
  %19 = sub nsw i64 %18, 2
  store i64 %19, ptr %1, align 8
  br label %35

20:                                               ; preds = %6
  %21 = load i64, ptr @N, align 8, !tbaa !5
  %22 = icmp eq i64 %21, 2
  br i1 %22, label %23, label %28

23:                                               ; preds = %20
  %24 = load i64, ptr @M, align 8, !tbaa !5
  %25 = icmp eq i64 %24, 2
  br i1 %25, label %26, label %27

26:                                               ; preds = %23
  store i64 0, ptr %1, align 8
  br label %35

27:                                               ; preds = %23
  store i64 0, ptr %1, align 8
  br label %35

28:                                               ; preds = %20
  br label %29

29:                                               ; preds = %28
  %30 = load i64, ptr @N, align 8, !tbaa !5
  %31 = sub nsw i64 %30, 2
  %32 = load i64, ptr @M, align 8, !tbaa !5
  %33 = sub nsw i64 %32, 2
  %34 = mul nsw i64 %31, %33
  store i64 %34, ptr %1, align 8
  br label %35

35:                                               ; preds = %29, %27, %26, %17, %16, %12
  %36 = load i64, ptr %1, align 8
  ret i64 %36
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local void @_ZSt4swapIxENSt9enable_ifIXsr6__and_ISt6__not_ISt15__is_tuple_likeIT_EESt21is_move_constructibleIS3_ESt18is_move_assignableIS3_EEE5valueEvE4typeERS3_SC_(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) #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 = { inlinehint 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 = { 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 = !{!"long long", !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"

@N = external dso_local global i64, align 8
@M = external dso_local global i64, align 8

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_Z3ansv() local_unnamed_addr #0 {
  %1 = load i64, ptr @N, align 8, !tbaa !5
  %2 = load i64, ptr @M, align 8, !tbaa !5
  %3 = icmp sgt i64 %1, %2
  br i1 %3, label %4, label %5

4:                                                ; preds = %0
  tail call void @_ZSt4swapIxENSt9enable_ifIXsr6__and_ISt6__not_ISt15__is_tuple_likeIT_EESt21is_move_constructibleIS3_ESt18is_move_assignableIS3_EEE5valueEvE4typeERS3_SC_(ptr noundef nonnull align 8 dereferenceable(8) @N, ptr noundef nonnull align 8 dereferenceable(8) @M) #2
  %.pr = load i64, ptr @N, align 8, !tbaa !5
  br label %5

5:                                                ; preds = %4, %0
  %6 = phi i64 [ %.pr, %4 ], [ %1, %0 ]
  switch i64 %6, label %12 [
    i64 1, label %7
    i64 2, label %17
  ]

7:                                                ; preds = %5
  %8 = load i64, ptr @M, align 8, !tbaa !5
  switch i64 %8, label %10 [
    i64 1, label %17
    i64 2, label %9
  ]

9:                                                ; preds = %7
  br label %17

10:                                               ; preds = %7
  %11 = add nsw i64 %8, -2
  br label %17

12:                                               ; preds = %5
  %13 = add nsw i64 %6, -2
  %14 = load i64, ptr @M, align 8, !tbaa !5
  %15 = add nsw i64 %14, -2
  %16 = mul nsw i64 %15, %13
  br label %17

17:                                               ; preds = %5, %7, %12, %10, %9
  %.0 = phi i64 [ 0, %9 ], [ %11, %10 ], [ %16, %12 ], [ %8, %7 ], [ 0, %5 ]
  ret i64 %.0
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local void @_ZSt4swapIxENSt9enable_ifIXsr6__and_ISt6__not_ISt15__is_tuple_likeIT_EESt21is_move_constructibleIS3_ESt18is_move_assignableIS3_EEE5valueEvE4typeERS3_SC_(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #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 = { inlinehint 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 = { 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 = !{!"long long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InstCombinePass,JumpThreadingPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass