; LLVM IR from KishanBGajera/2024-366-Days-Of-DSA :: Data Structures/Linear/Stack/Applications of Stack/Tower of Hanoi/C (main)

; 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"

%struct.Tower = type { ptr, i8 }

@.str.12 = external hidden unnamed_addr constant [3 x i8], align 1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind uwtable
declare dso_local void @push(ptr noundef, i32 noundef) #1

; Function Attrs: nounwind uwtable
declare dso_local ptr @getTower(i8 noundef signext, i32 noundef) #1

; Function Attrs: nounwind uwtable
declare dso_local void @towerOfHanoi(i32 noundef, ptr noundef, ptr noundef, ptr noundef) #1

; Function Attrs: nounwind uwtable
define dso_local i32 @main() #1 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #3
  %7 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.12, ptr noundef %2)
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  %8 = load i32, ptr %2, align 4, !tbaa !5
  %9 = call ptr @getTower(i8 noundef signext 65, i32 noundef %8)
  store ptr %9, ptr %3, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  %10 = load i32, ptr %2, align 4, !tbaa !5
  %11 = call ptr @getTower(i8 noundef signext 66, i32 noundef %10)
  store ptr %11, ptr %4, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #3
  %12 = load i32, ptr %2, align 4, !tbaa !5
  %13 = call ptr @getTower(i8 noundef signext 67, i32 noundef %12)
  store ptr %13, ptr %5, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  %14 = load i32, ptr %2, align 4, !tbaa !5
  store i32 %14, ptr %6, align 4, !tbaa !5
  br label %15

15:                                               ; preds = %24, %0
  %16 = load i32, ptr %6, align 4, !tbaa !5
  %17 = icmp sgt i32 %16, 0
  br i1 %17, label %19, label %18

18:                                               ; preds = %15
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  br label %27

19:                                               ; preds = %15
  %20 = load ptr, ptr %3, align 8, !tbaa !9
  %21 = getelementptr inbounds %struct.Tower, ptr %20, i32 0, i32 0
  %22 = load ptr, ptr %21, align 8, !tbaa !11
  %23 = load i32, ptr %6, align 4, !tbaa !5
  call void @push(ptr noundef %22, i32 noundef %23)
  br label %24

24:                                               ; preds = %19
  %25 = load i32, ptr %6, align 4, !tbaa !5
  %26 = add nsw i32 %25, -1
  store i32 %26, ptr %6, align 4, !tbaa !5
  br label %15, !llvm.loop !13

27:                                               ; preds = %18
  %28 = load i32, ptr %2, align 4, !tbaa !5
  %29 = load ptr, ptr %3, align 8, !tbaa !9
  %30 = load ptr, ptr %4, align 8, !tbaa !9
  %31 = load ptr, ptr %5, align 8, !tbaa !9
  call void @towerOfHanoi(i32 noundef %28, ptr noundef %29, ptr noundef %30, ptr noundef %31)
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #3
  ret i32 0
}

declare i32 @__isoc99_scanf(ptr noundef, ...) #2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 = { "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 #3 = { 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !10, i64 0}
!12 = !{!"Tower", !10, i64 0, !7, i64 8}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}


; 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.12 = external hidden unnamed_addr constant [3 x i8], align 1

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind uwtable
declare dso_local void @push(ptr noundef, i32 noundef) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
declare dso_local ptr @getTower(i8 noundef signext, i32 noundef) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
declare dso_local void @towerOfHanoi(i32 noundef, ptr noundef, ptr noundef, ptr noundef) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #1 {
  %1 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #3
  %2 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.12, ptr noundef nonnull %1)
  %3 = load i32, ptr %1, align 4, !tbaa !5
  %4 = call ptr @getTower(i8 noundef signext 65, i32 noundef %3)
  %5 = load i32, ptr %1, align 4, !tbaa !5
  %6 = call ptr @getTower(i8 noundef signext 66, i32 noundef %5)
  %7 = load i32, ptr %1, align 4, !tbaa !5
  %8 = call ptr @getTower(i8 noundef signext 67, i32 noundef %7)
  %9 = load i32, ptr %1, align 4, !tbaa !5
  %10 = icmp sgt i32 %9, 0
  br i1 %10, label %.lr.ph, label %._crit_edge

._crit_edge.loopexit:                             ; preds = %.lr.ph
  %.pre = load i32, ptr %1, align 4, !tbaa !5
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %0
  %11 = phi i32 [ %.pre, %._crit_edge.loopexit ], [ %9, %0 ]
  call void @towerOfHanoi(i32 noundef %11, ptr noundef %4, ptr noundef %6, ptr noundef %8)
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #3
  ret i32 0

.lr.ph:                                           ; preds = %0, %.lr.ph
  %.06 = phi i32 [ %13, %.lr.ph ], [ %9, %0 ]
  %12 = load ptr, ptr %4, align 8, !tbaa !9
  call void @push(ptr noundef %12, i32 noundef %.06)
  %13 = add nsw i32 %.06, -1
  %14 = icmp ugt i32 %.06, 1
  br i1 %14, label %.lr.ph, label %._crit_edge.loopexit, !llvm.loop !12
}

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

attributes #0 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 = { 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" }
attributes #3 = { 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !11, i64 0}
!10 = !{!"Tower", !11, i64 0, !7, i64 8}
!11 = !{!"any pointer", !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass