; LLVM IR from MinaFaried3/Assiut-University-Training---Newcomers :: j-sheet7_recursion/P-Log2.ll (Z5log_2x)

; 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 @_Z5log_2x(i64 noundef %0) #0 {
  %2 = alloca i64, align 8
  store i64 %0, ptr %2, align 8, !tbaa !5
  %3 = load i64, ptr %2, align 8, !tbaa !5
  %4 = icmp eq i64 %3, 1
  br i1 %4, label %5, label %6

5:                                                ; preds = %1
  br label %11

6:                                                ; preds = %1
  %7 = load i32, ptr @counter, align 4, !tbaa !9
  %8 = add nsw i32 %7, 1
  store i32 %8, ptr @counter, align 4, !tbaa !9
  %9 = load i64, ptr %2, align 8, !tbaa !5
  %10 = sdiv i64 %9, 2
  call void @_Z5log_2x(i64 noundef %10)
  br label %11

11:                                               ; preds = %6, %5
  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 @_Z5log_2x(i64 noundef %0) local_unnamed_addr #0 {
  %2 = icmp eq i64 %0, 1
  br i1 %2, label %8, label %tailrecurse.preheader

tailrecurse.preheader:                            ; preds = %1
  %counter.promoted = load i32, ptr @counter, align 4, !tbaa !5
  br label %tailrecurse

tailrecurse:                                      ; preds = %tailrecurse.preheader, %tailrecurse
  %.tr2 = phi i64 [ %5, %tailrecurse ], [ %0, %tailrecurse.preheader ]
  %3 = phi i32 [ %4, %tailrecurse ], [ %counter.promoted, %tailrecurse.preheader ]
  %4 = add nsw i32 %3, 1
  %5 = sdiv i64 %.tr2, 2
  %6 = and i64 %.tr2, -2
  %7 = icmp eq i64 %6, 2
  br i1 %7, label %tailrecurse._crit_edge, label %tailrecurse

tailrecurse._crit_edge:                           ; preds = %tailrecurse
  store i32 %4, ptr @counter, align 4, !tbaa !5
  br label %8

8:                                                ; preds = %tailrecurse._crit_edge, %1
  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,InferAlignmentPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass