; LLVM IR from div-bargali/Data-Structures-and-Algorithms :: C/Data-Structures/Stack (Tower_of_Hanoi)

; 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"

@.str = external hidden unnamed_addr constant [36 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [37 x i8], align 1

; Function Attrs: nounwind uwtable
define dso_local void @towerOfHanoi(i32 noundef %0, i8 noundef signext %1, i8 noundef signext %2, i8 noundef signext %3) #0 {
  %5 = alloca i32, align 4
  %6 = alloca i8, align 1
  %7 = alloca i8, align 1
  %8 = alloca i8, align 1
  store i32 %0, ptr %5, align 4, !tbaa !5
  store i8 %1, ptr %6, align 1, !tbaa !9
  store i8 %2, ptr %7, align 1, !tbaa !9
  store i8 %3, ptr %8, align 1, !tbaa !9
  %9 = load i32, ptr %5, align 4, !tbaa !5
  %10 = icmp eq i32 %9, 1
  br i1 %10, label %11, label %17

11:                                               ; preds = %4
  %12 = load i8, ptr %6, align 1, !tbaa !9
  %13 = sext i8 %12 to i32
  %14 = load i8, ptr %7, align 1, !tbaa !9
  %15 = sext i8 %14 to i32
  %16 = call i32 (ptr, ...) @printf(ptr noundef @.str, i32 noundef %13, i32 noundef %15)
  br label %34

17:                                               ; preds = %4
  %18 = load i32, ptr %5, align 4, !tbaa !5
  %19 = sub nsw i32 %18, 1
  %20 = load i8, ptr %6, align 1, !tbaa !9
  %21 = load i8, ptr %8, align 1, !tbaa !9
  %22 = load i8, ptr %7, align 1, !tbaa !9
  call void @towerOfHanoi(i32 noundef %19, i8 noundef signext %20, i8 noundef signext %21, i8 noundef signext %22)
  %23 = load i32, ptr %5, align 4, !tbaa !5
  %24 = load i8, ptr %6, align 1, !tbaa !9
  %25 = sext i8 %24 to i32
  %26 = load i8, ptr %7, align 1, !tbaa !9
  %27 = sext i8 %26 to i32
  %28 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, i32 noundef %23, i32 noundef %25, i32 noundef %27)
  %29 = load i32, ptr %5, align 4, !tbaa !5
  %30 = sub nsw i32 %29, 1
  %31 = load i8, ptr %8, align 1, !tbaa !9
  %32 = load i8, ptr %7, align 1, !tbaa !9
  %33 = load i8, ptr %6, align 1, !tbaa !9
  call void @towerOfHanoi(i32 noundef %30, i8 noundef signext %31, i8 noundef signext %32, i8 noundef signext %33)
  br label %34

34:                                               ; preds = %17, %11
  ret void
}

declare i32 @printf(ptr noundef, ...) #1

attributes #0 = { 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 = { "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/C++ TBAA"}
!9 = !{!7, !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"

@.str = external hidden unnamed_addr constant [36 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [37 x i8], align 1

; Function Attrs: nofree nounwind uwtable
define dso_local void @towerOfHanoi(i32 noundef %0, i8 noundef signext %1, i8 noundef signext %2, i8 noundef signext %3) local_unnamed_addr #0 {
  %5 = icmp eq i32 %0, 1
  %.pre = sext i8 %2 to i32
  br i1 %5, label %tailrecurse._crit_edge, label %tailrecurse

tailrecurse._crit_edge:                           ; preds = %tailrecurse, %4
  %.tr14.lcssa = phi i8 [ %1, %4 ], [ %.tr1619, %tailrecurse ]
  %6 = sext i8 %.tr14.lcssa to i32
  %7 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, i32 noundef %6, i32 noundef %.pre)
  ret void

tailrecurse:                                      ; preds = %4, %tailrecurse
  %.tr1619 = phi i8 [ %.tr1418, %tailrecurse ], [ %3, %4 ]
  %.tr1418 = phi i8 [ %.tr1619, %tailrecurse ], [ %1, %4 ]
  %.tr17 = phi i32 [ %8, %tailrecurse ], [ %0, %4 ]
  %8 = add nsw i32 %.tr17, -1
  tail call void @towerOfHanoi(i32 noundef %8, i8 noundef signext %.tr1418, i8 noundef signext %.tr1619, i8 noundef signext %2)
  %9 = sext i8 %.tr1418 to i32
  %10 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, i32 noundef %.tr17, i32 noundef %9, i32 noundef %.pre)
  %11 = icmp eq i32 %8, 1
  br i1 %11, label %tailrecurse._crit_edge, label %tailrecurse
}

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

attributes #0 = { nofree 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 = { nofree nounwind "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,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass