; LLVM IR from div-bargali/Data-Structures-and-Algorithms :: C++/Algorithms/Mathematical/Program for nth Catalan number.ll (Z7catalanj)

; 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: mustprogress uwtable
define dso_local noundef i64 @_Z7catalanj(i32 noundef %0) #0 {
  %2 = alloca i64, align 8
  %3 = alloca i32, align 4
  %4 = alloca i64, align 8
  %5 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  %6 = load i32, ptr %3, align 4, !tbaa !5
  %7 = icmp ule i32 %6, 1
  br i1 %7, label %8, label %9

8:                                                ; preds = %1
  store i64 1, ptr %2, align 8
  br label %31

9:                                                ; preds = %1
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  store i64 0, ptr %4, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  store i32 0, ptr %5, align 4, !tbaa !5
  br label %10

10:                                               ; preds = %26, %9
  %11 = load i32, ptr %5, align 4, !tbaa !5
  %12 = load i32, ptr %3, align 4, !tbaa !5
  %13 = icmp ult i32 %11, %12
  br i1 %13, label %15, label %14

14:                                               ; preds = %10
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  br label %29

15:                                               ; preds = %10
  %16 = load i32, ptr %5, align 4, !tbaa !5
  %17 = call noundef i64 @_Z7catalanj(i32 noundef %16)
  %18 = load i32, ptr %3, align 4, !tbaa !5
  %19 = load i32, ptr %5, align 4, !tbaa !5
  %20 = sub i32 %18, %19
  %21 = sub i32 %20, 1
  %22 = call noundef i64 @_Z7catalanj(i32 noundef %21)
  %23 = mul i64 %17, %22
  %24 = load i64, ptr %4, align 8, !tbaa !9
  %25 = add i64 %24, %23
  store i64 %25, ptr %4, align 8, !tbaa !9
  br label %26

26:                                               ; preds = %15
  %27 = load i32, ptr %5, align 4, !tbaa !5
  %28 = add nsw i32 %27, 1
  store i32 %28, ptr %5, align 4, !tbaa !5
  br label %10, !llvm.loop !11

29:                                               ; preds = %14
  %30 = load i64, ptr %4, align 8, !tbaa !9
  store i64 %30, ptr %2, align 8
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  br label %31

31:                                               ; preds = %29, %8
  %32 = load i64, ptr %2, align 8
  ret i64 %32
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

attributes #0 = { 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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { 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 = !{!"long", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"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"

; Function Attrs: mustprogress nofree nosync nounwind willreturn memory(none) uwtable
define dso_local noundef i64 @_Z7catalanj(i32 noundef %0) local_unnamed_addr #0 {
  %2 = icmp ult i32 %0, 2
  br i1 %2, label %.loopexit, label %.preheader

.preheader:                                       ; preds = %1, %.preheader
  %.014 = phi i32 [ %9, %.preheader ], [ 0, %1 ]
  %.01013 = phi i64 [ %8, %.preheader ], [ 0, %1 ]
  %3 = tail call noundef i64 @_Z7catalanj(i32 noundef %.014)
  %4 = xor i32 %.014, -1
  %5 = add i32 %4, %0
  %6 = tail call noundef i64 @_Z7catalanj(i32 noundef %5)
  %7 = mul i64 %6, %3
  %8 = add i64 %7, %.01013
  %9 = add nuw nsw i32 %.014, 1
  %exitcond.not = icmp eq i32 %9, %0
  br i1 %exitcond.not, label %.loopexit, label %.preheader, !llvm.loop !5

.loopexit:                                        ; preds = %.preheader, %1
  %.011 = phi i64 [ 1, %1 ], [ %8, %.preheader ]
  ret i64 %.011
}

attributes #0 = { mustprogress nofree nosync nounwind willreturn memory(none) 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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass