; LLVM IR from MinaFaried3/Assiut-University-Training---Newcomers :: j-sheet7_recursion/Q-3n+1sequence.ll (Z8sequencex)

; 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"

@counter = external dso_local global i32, align 4

; Function Attrs: mustprogress uwtable
define dso_local void @_Z8sequencex(i64 noundef %0) #0 {
  %2 = alloca i64, align 8
  store i64 %0, ptr %2, align 8, !tbaa !5
  %3 = load i32, ptr @counter, align 4, !tbaa !9
  %4 = add nsw i32 %3, 1
  store i32 %4, ptr @counter, align 4, !tbaa !9
  %5 = load i64, ptr %2, align 8, !tbaa !5
  %6 = icmp eq i64 %5, 1
  br i1 %6, label %7, label %8

7:                                                ; preds = %1
  br label %19

8:                                                ; preds = %1
  %9 = load i64, ptr %2, align 8, !tbaa !5
  %10 = srem i64 %9, 2
  %11 = icmp eq i64 %10, 0
  br i1 %11, label %12, label %15

12:                                               ; preds = %8
  %13 = load i64, ptr %2, align 8, !tbaa !5
  %14 = sdiv i64 %13, 2
  call void @_Z8sequencex(i64 noundef %14)
  br label %19

15:                                               ; preds = %8
  %16 = load i64, ptr %2, align 8, !tbaa !5
  %17 = mul nsw i64 3, %16
  %18 = add nsw i64 %17, 1
  call void @_Z8sequencex(i64 noundef %18)
  br label %19

19:                                               ; preds = %15, %12, %7
  ret void
}

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" }

!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"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}


; 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"

@counter = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: mustprogress nofree norecurse nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: none) uwtable
define dso_local void @_Z8sequencex(i64 noundef %0) local_unnamed_addr #0 {
  %counter.promoted = load i32, ptr @counter, align 4, !tbaa !5
  %2 = add nsw i32 %counter.promoted, 1
  %3 = icmp eq i64 %0, 1
  br i1 %3, label %tailrecurse._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1, %.lr.ph
  %4 = phi i32 [ %10, %.lr.ph ], [ %2, %1 ]
  %.tr4 = phi i64 [ %.tr.be, %.lr.ph ], [ %0, %1 ]
  %5 = and i64 %.tr4, 1
  %6 = icmp eq i64 %5, 0
  %7 = ashr exact i64 %.tr4, 1
  %8 = mul nsw i64 %.tr4, 3
  %9 = add nsw i64 %8, 1
  %.tr.be = select i1 %6, i64 %7, i64 %9
  %10 = add nsw i32 %4, 1
  %11 = icmp eq i64 %.tr.be, 1
  br i1 %11, label %tailrecurse._crit_edge, label %.lr.ph

tailrecurse._crit_edge:                           ; preds = %.lr.ph, %1
  %.lcssa = phi i32 [ %2, %1 ], [ %10, %.lr.ph ]
  store i32 %.lcssa, ptr @counter, align 4, !tbaa !5
  ret void
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: 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)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}


; Effective O3 passes: GVNPass,GlobalOptPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass