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

; 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"

%struct.CMCAllocNode = type { ptr, ptr, ptr, ptr }
%struct.BinaryTree = type { ptr, i64, i32, ptr, ptr }

@cmc_alloc_node_default = external hidden global %struct.CMCAllocNode, align 8

; Function Attrs: nounwind uwtable
define dso_local ptr @tree_new_custom(ptr noundef %0, ptr noundef %1, ptr noundef %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  %8 = alloca ptr, align 8
  %9 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !5
  store ptr %2, ptr %7, align 8, !tbaa !5
  %10 = load ptr, ptr %7, align 8, !tbaa !5
  %11 = load ptr, ptr %5, align 8, !tbaa !5
  %12 = icmp ne ptr %11, null
  br i1 %12, label %14, label %13

13:                                               ; preds = %3
  store ptr null, ptr %4, align 8
  br label %41

14:                                               ; preds = %3
  %15 = load ptr, ptr %6, align 8, !tbaa !5
  %16 = icmp ne ptr %15, null
  br i1 %16, label %18, label %17

17:                                               ; preds = %14
  store ptr @cmc_alloc_node_default, ptr %6, align 8, !tbaa !5
  br label %18

18:                                               ; preds = %17, %14
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  %19 = load ptr, ptr %6, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.CMCAllocNode, ptr %19, i32 0, i32 0
  %21 = load ptr, ptr %20, align 8, !tbaa !9
  %22 = call ptr %21(i64 noundef 40)
  store ptr %22, ptr %8, align 8, !tbaa !5
  %23 = load ptr, ptr %8, align 8, !tbaa !5
  %24 = icmp ne ptr %23, null
  br i1 %24, label %26, label %25

25:                                               ; preds = %18
  store ptr null, ptr %4, align 8
  store i32 1, ptr %9, align 4
  br label %40

26:                                               ; preds = %18
  %27 = load ptr, ptr %8, align 8, !tbaa !5
  %28 = getelementptr inbounds %struct.BinaryTree, ptr %27, i32 0, i32 1
  store i64 0, ptr %28, align 8, !tbaa !11
  %29 = load ptr, ptr %8, align 8, !tbaa !5
  %30 = getelementptr inbounds %struct.BinaryTree, ptr %29, i32 0, i32 0
  store ptr null, ptr %30, align 8, !tbaa !15
  %31 = load ptr, ptr %8, align 8, !tbaa !5
  %32 = getelementptr inbounds %struct.BinaryTree, ptr %31, i32 0, i32 2
  store i32 0, ptr %32, align 8, !tbaa !16
  %33 = load ptr, ptr %5, align 8, !tbaa !5
  %34 = load ptr, ptr %8, align 8, !tbaa !5
  %35 = getelementptr inbounds %struct.BinaryTree, ptr %34, i32 0, i32 3
  store ptr %33, ptr %35, align 8, !tbaa !17
  %36 = load ptr, ptr %6, align 8, !tbaa !5
  %37 = load ptr, ptr %8, align 8, !tbaa !5
  %38 = getelementptr inbounds %struct.BinaryTree, ptr %37, i32 0, i32 4
  store ptr %36, ptr %38, align 8, !tbaa !18
  %39 = load ptr, ptr %8, align 8, !tbaa !5
  store ptr %39, ptr %4, align 8
  store i32 1, ptr %9, align 4
  br label %40

40:                                               ; preds = %26, %25
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  br label %41

41:                                               ; preds = %40, %13
  %42 = load ptr, ptr %4, align 8
  ret ptr %42
}

; 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 = { 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 }

!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, !6, i64 0}
!10 = !{!"CMCAllocNode", !6, i64 0, !6, i64 8, !6, i64 16, !6, i64 24}
!11 = !{!12, !13, i64 8}
!12 = !{!"BinaryTree", !6, i64 0, !13, i64 8, !14, i64 16, !6, i64 24, !6, i64 32}
!13 = !{!"long", !7, i64 0}
!14 = !{!"int", !7, i64 0}
!15 = !{!12, !6, i64 0}
!16 = !{!12, !14, i64 16}
!17 = !{!12, !6, i64 24}
!18 = !{!12, !6, i64 32}


; 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"

%struct.CMCAllocNode = type { ptr, ptr, ptr, ptr }

@cmc_alloc_node_default = external hidden global %struct.CMCAllocNode, align 8

; Function Attrs: nounwind uwtable
define dso_local ptr @tree_new_custom(ptr noundef %0, ptr noundef %1, ptr nocapture noundef readnone %2) local_unnamed_addr #0 {
  %.not = icmp eq ptr %0, null
  br i1 %.not, label %10, label %4

4:                                                ; preds = %3
  %.not16 = icmp eq ptr %1, null
  %spec.store.select = select i1 %.not16, ptr @cmc_alloc_node_default, ptr %1
  %5 = load ptr, ptr %spec.store.select, align 8, !tbaa !5
  %6 = tail call ptr %5(i64 noundef 40) #2
  %.not17 = icmp eq ptr %6, null
  br i1 %.not17, label %10, label %7

7:                                                ; preds = %4
  %8 = getelementptr inbounds i8, ptr %6, i64 24
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 8 dereferenceable(20) %6, i8 0, i64 20, i1 false)
  store ptr %0, ptr %8, align 8, !tbaa !10
  %9 = getelementptr inbounds i8, ptr %6, i64 32
  store ptr %spec.store.select, ptr %9, align 8, !tbaa !14
  br label %10

10:                                               ; preds = %7, %4, %3
  %.1 = phi ptr [ null, %3 ], [ %6, %7 ], [ null, %4 ]
  ret ptr %.1
}

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #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 nounwind willreturn memory(argmem: write) }
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, !7, i64 0}
!6 = !{!"CMCAllocNode", !7, i64 0, !7, i64 8, !7, i64 16, !7, i64 24}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!11, !7, i64 24}
!11 = !{!"BinaryTree", !7, i64 0, !12, i64 8, !13, i64 16, !7, i64 24, !7, i64 32}
!12 = !{!"long", !8, i64 0}
!13 = !{!"int", !8, i64 0}
!14 = !{!11, !7, i64 32}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,MemCpyOptPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass