; LLVM IR from imteekay/algorithms :: computer_science/algorithms/recursion/fibonacci (fibonacci)

; 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 [4 x i8], align 1

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

10:                                               ; preds = %3
  store i32 0, ptr %4, align 4
  br label %25

11:                                               ; preds = %3
  %12 = load i32, ptr %5, align 4, !tbaa !5
  %13 = icmp eq i32 %12, 2
  br i1 %13, label %14, label %15

14:                                               ; preds = %11
  store i32 1, ptr %4, align 4
  br label %25

15:                                               ; preds = %11
  %16 = load i32, ptr %7, align 4, !tbaa !5
  %17 = call i32 (ptr, ...) @printf(ptr noundef @.str, i32 noundef %16)
  %18 = load i32, ptr %5, align 4, !tbaa !5
  %19 = sub nsw i32 %18, 1
  %20 = load i32, ptr %7, align 4, !tbaa !5
  %21 = load i32, ptr %6, align 4, !tbaa !5
  %22 = load i32, ptr %7, align 4, !tbaa !5
  %23 = add nsw i32 %21, %22
  %24 = call i32 @fibonacciHelper(i32 noundef %19, i32 noundef %20, i32 noundef %23)
  store i32 %24, ptr %4, align 4
  br label %25

25:                                               ; preds = %15, %14, %10
  %26 = load i32, ptr %4, align 4
  ret i32 %26
}

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"}


; 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 [4 x i8], align 1

; Function Attrs: nofree nounwind uwtable
define dso_local range(i32 0, 2) i32 @fibonacciHelper(i32 noundef %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  br label %tailrecurse

tailrecurse:                                      ; preds = %4, %3
  %.tr = phi i32 [ %0, %3 ], [ %6, %4 ]
  %.tr9 = phi i32 [ %1, %3 ], [ %.tr10, %4 ]
  %.tr10 = phi i32 [ %2, %3 ], [ %7, %4 ]
  switch i32 %.tr, label %4 [
    i32 1, label %.loopexit.loopexit
    i32 2, label %.loopexit
  ]

4:                                                ; preds = %tailrecurse
  %5 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, i32 noundef %.tr10)
  %6 = add nsw i32 %.tr, -1
  %7 = add nsw i32 %.tr10, %.tr9
  br label %tailrecurse

.loopexit.loopexit:                               ; preds = %tailrecurse
  br label %.loopexit

.loopexit:                                        ; preds = %tailrecurse, %.loopexit.loopexit
  %.0 = phi i32 [ 0, %.loopexit.loopexit ], [ 1, %tailrecurse ]
  ret i32 %.0
}

; 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: GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass