; LLVM IR from wuzhouhui/leetcode :: 22_gen_parenth (generateParenthesis)

; 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"

@res = external hidden global ptr, align 8
@p = external hidden global i32, align 4

; Function Attrs: nounwind uwtable
define dso_local ptr @generateParenthesis(i32 noundef %0, ptr noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  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 ne i32 %7, 0
  br i1 %8, label %11, label %9

9:                                                ; preds = %2
  %10 = load ptr, ptr %5, align 8, !tbaa !9
  store i32 0, ptr %10, align 4, !tbaa !5
  store ptr null, ptr %3, align 8
  br label %25

11:                                               ; preds = %2
  store ptr null, ptr @res, align 8, !tbaa !9
  store i32 0, ptr @p, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  %12 = load i32, ptr %4, align 4, !tbaa !5
  %13 = mul nsw i32 2, %12
  %14 = add nsw i32 %13, 1
  %15 = sext i32 %14 to i64
  %16 = mul i64 %15, 1
  %17 = call noalias ptr @malloc(i64 noundef %16) #4
  store ptr %17, ptr %6, align 8, !tbaa !9
  %18 = load ptr, ptr %6, align 8, !tbaa !9
  %19 = getelementptr inbounds i8, ptr %18, i64 0
  store i8 0, ptr %19, align 1, !tbaa !11
  %20 = load ptr, ptr %6, align 8, !tbaa !9
  %21 = load i32, ptr %4, align 4, !tbaa !5
  call void @do_gen(ptr noundef %20, i32 noundef %21)
  %22 = load i32, ptr @p, align 4, !tbaa !5
  %23 = load ptr, ptr %5, align 8, !tbaa !9
  store i32 %22, ptr %23, align 4, !tbaa !5
  %24 = load ptr, ptr @res, align 8, !tbaa !9
  store ptr %24, ptr %3, align 8
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  br label %25

25:                                               ; preds = %11, %9
  %26 = load ptr, ptr %3, align 8
  ret ptr %26
}

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

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #2

; Function Attrs: nounwind uwtable
declare hidden void @do_gen(ptr noundef, i32 noundef) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { nounwind allocsize(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 = { nounwind }
attributes #4 = { nounwind allocsize(0) }

!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 = !{!7, !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"

@res = external hidden local_unnamed_addr global ptr, align 8
@p = external hidden local_unnamed_addr global i32, align 4

; Function Attrs: nounwind uwtable
define dso_local ptr @generateParenthesis(i32 noundef %0, ptr nocapture noundef writeonly %1) local_unnamed_addr #0 {
  %.not = icmp eq i32 %0, 0
  br i1 %.not, label %10, label %3

3:                                                ; preds = %2
  store ptr null, ptr @res, align 8, !tbaa !5
  store i32 0, ptr @p, align 4, !tbaa !9
  %4 = shl nsw i32 %0, 1
  %5 = or disjoint i32 %4, 1
  %6 = sext i32 %5 to i64
  %7 = tail call noalias ptr @malloc(i64 noundef %6) #2
  store i8 0, ptr %7, align 1, !tbaa !11
  tail call void @do_gen(ptr noundef nonnull %7, i32 noundef %0)
  %8 = load i32, ptr @p, align 4, !tbaa !9
  %9 = load ptr, ptr @res, align 8, !tbaa !5
  br label %10

10:                                               ; preds = %2, %3
  %.sink = phi i32 [ %8, %3 ], [ 0, %2 ]
  %.0 = phi ptr [ %9, %3 ], [ null, %2 ]
  store i32 %.sink, ptr %1, align 4
  ret ptr %.0
}

; Function Attrs: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
declare hidden void @do_gen(ptr noundef, i32 noundef) local_unnamed_addr #0

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 = { mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite) "alloc-family"="malloc" "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 = { nounwind allocsize(0) }

!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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!7, !7, i64 0}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,MergedLoadStoreMotionPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,TailCallElimPass