; LLVM IR from tangjz/acm-icpc :: 51nod/1661.ll (Z2sgxx)

; 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"

; Function Attrs: mustprogress uwtable
define dso_local noundef i64 @_Z2sgxx(i64 noundef %0, i64 noundef %1) #0 {
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca i64, align 8
  %6 = alloca i64, align 8
  store i64 %0, ptr %3, align 8, !tbaa !5
  store i64 %1, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  %7 = load i64, ptr %3, align 8, !tbaa !5
  %8 = sub nsw i64 %7, 1
  %9 = load i64, ptr %4, align 8, !tbaa !5
  %10 = sdiv i64 %8, %9
  store i64 %10, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %11 = load i64, ptr %3, align 8, !tbaa !5
  %12 = sub nsw i64 %11, 1
  %13 = load i64, ptr %4, align 8, !tbaa !5
  %14 = srem i64 %12, %13
  %15 = add nsw i64 %14, 1
  store i64 %15, ptr %6, align 8, !tbaa !5
  %16 = load i64, ptr %6, align 8, !tbaa !5
  %17 = icmp eq i64 %16, 1
  br i1 %17, label %18, label %28

18:                                               ; preds = %2
  %19 = load i64, ptr %5, align 8, !tbaa !5
  %20 = icmp ne i64 %19, 0
  br i1 %20, label %21, label %25

21:                                               ; preds = %18
  %22 = load i64, ptr %5, align 8, !tbaa !5
  %23 = load i64, ptr %4, align 8, !tbaa !5
  %24 = call noundef i64 @_Z2sgxx(i64 noundef %22, i64 noundef %23)
  br label %26

25:                                               ; preds = %18
  br label %26

26:                                               ; preds = %25, %21
  %27 = phi i64 [ %24, %21 ], [ 0, %25 ]
  br label %33

28:                                               ; preds = %2
  %29 = load i64, ptr %3, align 8, !tbaa !5
  %30 = load i64, ptr %5, align 8, !tbaa !5
  %31 = sub nsw i64 %29, %30
  %32 = sub nsw i64 %31, 1
  br label %33

33:                                               ; preds = %28, %26
  %34 = phi i64 [ %27, %26 ], [ %32, %28 ]
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  ret i64 %34
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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"

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local noundef range(i64 -9223372036854775808, 9223372036854775807) i64 @_Z2sgxx(i64 noundef %0, i64 noundef %1) local_unnamed_addr #0 {
  br label %tailrecurse

tailrecurse:                                      ; preds = %7, %2
  %.tr = phi i64 [ %0, %2 ], [ %4, %7 ]
  %3 = add nsw i64 %.tr, -1
  %4 = sdiv i64 %3, %1
  %5 = srem i64 %3, %1
  %6 = icmp eq i64 %5, 0
  br i1 %6, label %7, label %8

7:                                                ; preds = %tailrecurse
  %.not = icmp eq i64 %4, 0
  br i1 %.not, label %.loopexit, label %tailrecurse

8:                                                ; preds = %tailrecurse
  %9 = xor i64 %4, -1
  %10 = add i64 %.tr, %9
  br label %.loopexit

.loopexit:                                        ; preds = %7, %8
  %11 = phi i64 [ %10, %8 ], [ 0, %7 ]
  ret i64 %11
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(none) 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)"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass