; LLVM IR from Chasmiccoder/Algos-for-Amigos :: Mathematics/Series/p02_N_Bonacci_Numbers.ll (Z6fib_dpiPi)

; 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"

%"class.std::basic_ostream" = type { ptr, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }

@_ZSt4cout = external global %"class.std::basic_ostream", align 8
@.str = external hidden unnamed_addr constant [52 x i8], align 1

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef) #0

; Function Attrs: noreturn nounwind
declare void @exit(i32 noundef) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z6fib_dpiPi(i32 noundef %0, ptr noundef %1) #3 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !9
  %7 = load i32, ptr %4, align 4, !tbaa !5
  %8 = icmp slt i32 %7, 0
  br i1 %8, label %9, label %11

9:                                                ; preds = %2
  %10 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, ptr noundef @.str)
  call void @exit(i32 noundef -1) #4
  unreachable

11:                                               ; preds = %2
  %12 = load i32, ptr %4, align 4, !tbaa !5
  %13 = icmp eq i32 %12, 0
  br i1 %13, label %14, label %15

14:                                               ; preds = %11
  store i32 0, ptr %3, align 4
  br label %44

15:                                               ; preds = %11
  %16 = load ptr, ptr %5, align 8, !tbaa !9
  %17 = load i32, ptr %4, align 4, !tbaa !5
  %18 = sext i32 %17 to i64
  %19 = getelementptr inbounds i32, ptr %16, i64 %18
  %20 = load i32, ptr %19, align 4, !tbaa !5
  %21 = icmp ne i32 %20, 0
  br i1 %21, label %22, label %28

22:                                               ; preds = %15
  %23 = load ptr, ptr %5, align 8, !tbaa !9
  %24 = load i32, ptr %4, align 4, !tbaa !5
  %25 = sext i32 %24 to i64
  %26 = getelementptr inbounds i32, ptr %23, i64 %25
  %27 = load i32, ptr %26, align 4, !tbaa !5
  store i32 %27, ptr %3, align 4
  br label %44

28:                                               ; preds = %15
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #5
  %29 = load i32, ptr %4, align 4, !tbaa !5
  %30 = sub nsw i32 %29, 1
  %31 = load ptr, ptr %5, align 8, !tbaa !9
  %32 = call noundef i32 @_Z6fib_dpiPi(i32 noundef %30, ptr noundef %31)
  %33 = load i32, ptr %4, align 4, !tbaa !5
  %34 = sub nsw i32 %33, 2
  %35 = load ptr, ptr %5, align 8, !tbaa !9
  %36 = call noundef i32 @_Z6fib_dpiPi(i32 noundef %34, ptr noundef %35)
  %37 = add nsw i32 %32, %36
  store i32 %37, ptr %6, align 4, !tbaa !5
  %38 = load i32, ptr %6, align 4, !tbaa !5
  %39 = load ptr, ptr %5, align 8, !tbaa !9
  %40 = load i32, ptr %4, align 4, !tbaa !5
  %41 = sext i32 %40 to i64
  %42 = getelementptr inbounds i32, ptr %39, i64 %41
  store i32 %38, ptr %42, align 4, !tbaa !5
  %43 = load i32, ptr %6, align 4, !tbaa !5
  store i32 %43, ptr %3, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #5
  br label %44

44:                                               ; preds = %28, %22, %14
  %45 = load i32, ptr %3, align 4
  ret i32 %45
}

attributes #0 = { inlinehint 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" }
attributes #1 = { noreturn 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 #2 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { 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" }
attributes #4 = { noreturn nounwind }
attributes #5 = { 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++ 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"

%"class.std::basic_ostream" = type { ptr, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }

@_ZSt4cout = external global %"class.std::basic_ostream", align 8
@.str = external hidden unnamed_addr constant [52 x i8], align 1

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef) local_unnamed_addr #0

; Function Attrs: noreturn nounwind
declare void @exit(i32 noundef) local_unnamed_addr #1

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z6fib_dpiPi(i32 noundef %0, ptr noundef %1) local_unnamed_addr #2 {
  %3 = icmp slt i32 %0, 0
  br i1 %3, label %4, label %6

4:                                                ; preds = %2
  %5 = tail call noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, ptr noundef nonnull @.str)
  tail call void @exit(i32 noundef -1) #3
  unreachable

6:                                                ; preds = %2
  %7 = icmp eq i32 %0, 0
  br i1 %7, label %common.ret16, label %8

8:                                                ; preds = %6
  %9 = zext nneg i32 %0 to i64
  %10 = getelementptr inbounds i32, ptr %1, i64 %9
  %11 = load i32, ptr %10, align 4, !tbaa !5
  %.not = icmp eq i32 %11, 0
  br i1 %.not, label %12, label %common.ret16

common.ret16:                                     ; preds = %8, %6, %12
  %common.ret16.op = phi i32 [ %17, %12 ], [ 0, %6 ], [ %11, %8 ]
  ret i32 %common.ret16.op

12:                                               ; preds = %8
  %13 = add nsw i32 %0, -1
  %14 = tail call noundef i32 @_Z6fib_dpiPi(i32 noundef %13, ptr noundef nonnull %1)
  %15 = add nsw i32 %0, -2
  %16 = tail call noundef i32 @_Z6fib_dpiPi(i32 noundef %15, ptr noundef nonnull %1)
  %17 = add nsw i32 %16, %14
  store i32 %17, ptr %10, align 4, !tbaa !5
  br label %common.ret16
}

attributes #0 = { inlinehint 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" }
attributes #1 = { noreturn 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 #2 = { 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" }
attributes #3 = { noreturn 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++ TBAA"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass