; LLVM IR from LeoVen/C-Macro-Collections :: examples (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"

; Function Attrs: nounwind uwtable
declare dso_local void @print_stacks() #0

; Function Attrs: nounwind uwtable
declare dso_local void @move(ptr noundef, ptr noundef) #0

; Function Attrs: nounwind uwtable
define dso_local void @hanoi(i32 noundef %0, ptr noundef %1, ptr noundef %2, ptr noundef %3) #0 {
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  %8 = alloca ptr, align 8
  store i32 %0, ptr %5, align 4, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !9
  store ptr %2, ptr %7, align 8, !tbaa !9
  store ptr %3, ptr %8, align 8, !tbaa !9
  %9 = load i32, ptr %5, align 4, !tbaa !5
  %10 = icmp eq i32 %9, 0
  br i1 %10, label %11, label %12

11:                                               ; preds = %4
  br label %25

12:                                               ; preds = %4
  %13 = load i32, ptr %5, align 4, !tbaa !5
  %14 = sub nsw i32 %13, 1
  %15 = load ptr, ptr %6, align 8, !tbaa !9
  %16 = load ptr, ptr %8, align 8, !tbaa !9
  %17 = load ptr, ptr %7, align 8, !tbaa !9
  call void @hanoi(i32 noundef %14, ptr noundef %15, ptr noundef %16, ptr noundef %17)
  %18 = load ptr, ptr %6, align 8, !tbaa !9
  %19 = load ptr, ptr %8, align 8, !tbaa !9
  call void @move(ptr noundef %18, ptr noundef %19)
  call void @print_stacks()
  %20 = load i32, ptr %5, align 4, !tbaa !5
  %21 = sub nsw i32 %20, 1
  %22 = load ptr, ptr %7, align 8, !tbaa !9
  %23 = load ptr, ptr %6, align 8, !tbaa !9
  %24 = load ptr, ptr %8, align 8, !tbaa !9
  call void @hanoi(i32 noundef %21, ptr noundef %22, ptr noundef %23, ptr noundef %24)
  br label %25

25:                                               ; preds = %12, %11
  ret void
}

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" }

!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}


; 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: nounwind uwtable
declare dso_local void @print_stacks() local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local void @move(ptr noundef, ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @hanoi(i32 noundef %0, ptr noundef %1, ptr noundef %2, ptr noundef %3) local_unnamed_addr #0 {
  %5 = icmp eq i32 %0, 0
  br i1 %5, label %tailrecurse._crit_edge, label %tailrecurse

tailrecurse:                                      ; preds = %4, %tailrecurse
  %.tr1115 = phi ptr [ %.tr1014, %tailrecurse ], [ %2, %4 ]
  %.tr1014 = phi ptr [ %.tr1115, %tailrecurse ], [ %1, %4 ]
  %.tr13 = phi i32 [ %6, %tailrecurse ], [ %0, %4 ]
  %6 = add nsw i32 %.tr13, -1
  tail call void @hanoi(i32 noundef %6, ptr noundef %.tr1014, ptr noundef %3, ptr noundef %.tr1115)
  tail call void @move(ptr noundef %.tr1014, ptr noundef %3)
  tail call void @print_stacks()
  %7 = icmp eq i32 %6, 0
  br i1 %7, label %tailrecurse._crit_edge, label %tailrecurse

tailrecurse._crit_edge:                           ; preds = %tailrecurse, %4
  ret void
}

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" }

!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,GlobalOptPass,IPSCCPPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass