; 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.Stack = type { ptr, i64, i64, i32, ptr, ptr }

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

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

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

; Function Attrs: nounwind uwtable
define dso_local ptr @stk_new_custom(i64 noundef %0, ptr noundef %1, ptr noundef %2, ptr noundef %3) #1 {
  %5 = alloca ptr, align 8
  %6 = alloca i64, align 8
  %7 = alloca ptr, align 8
  %8 = alloca ptr, align 8
  %9 = alloca ptr, align 8
  %10 = alloca ptr, align 8
  %11 = alloca i32, align 4
  store i64 %0, ptr %6, align 8, !tbaa !5
  store ptr %1, ptr %7, align 8, !tbaa !9
  store ptr %2, ptr %8, align 8, !tbaa !9
  store ptr %3, ptr %9, align 8, !tbaa !9
  %12 = load ptr, ptr %9, align 8, !tbaa !9
  %13 = load i64, ptr %6, align 8, !tbaa !5
  %14 = icmp ult i64 %13, 1
  br i1 %14, label %15, label %16

15:                                               ; preds = %4
  store ptr null, ptr %5, align 8
  br label %65

16:                                               ; preds = %4
  %17 = load ptr, ptr %7, align 8, !tbaa !9
  %18 = icmp ne ptr %17, null
  br i1 %18, label %20, label %19

19:                                               ; preds = %16
  store ptr null, ptr %5, align 8
  br label %65

20:                                               ; preds = %16
  %21 = load ptr, ptr %8, align 8, !tbaa !9
  %22 = icmp ne ptr %21, null
  br i1 %22, label %24, label %23

23:                                               ; preds = %20
  store ptr @cmc_alloc_node_default, ptr %8, align 8, !tbaa !9
  br label %24

24:                                               ; preds = %23, %20
  call void @llvm.lifetime.start.p0(i64 8, ptr %10) #2
  %25 = load ptr, ptr %8, align 8, !tbaa !9
  %26 = getelementptr inbounds %struct.CMCAllocNode, ptr %25, i32 0, i32 0
  %27 = load ptr, ptr %26, align 8, !tbaa !11
  %28 = call ptr %27(i64 noundef 48)
  store ptr %28, ptr %10, align 8, !tbaa !9
  %29 = load ptr, ptr %10, align 8, !tbaa !9
  %30 = icmp ne ptr %29, null
  br i1 %30, label %32, label %31

31:                                               ; preds = %24
  store ptr null, ptr %5, align 8
  store i32 1, ptr %11, align 4
  br label %64

32:                                               ; preds = %24
  %33 = load ptr, ptr %8, align 8, !tbaa !9
  %34 = getelementptr inbounds %struct.CMCAllocNode, ptr %33, i32 0, i32 1
  %35 = load ptr, ptr %34, align 8, !tbaa !13
  %36 = load i64, ptr %6, align 8, !tbaa !5
  %37 = call ptr %35(i64 noundef %36, i64 noundef 8)
  %38 = load ptr, ptr %10, align 8, !tbaa !9
  %39 = getelementptr inbounds %struct.Stack, ptr %38, i32 0, i32 0
  store ptr %37, ptr %39, align 8, !tbaa !14
  %40 = load ptr, ptr %10, align 8, !tbaa !9
  %41 = getelementptr inbounds %struct.Stack, ptr %40, i32 0, i32 0
  %42 = load ptr, ptr %41, align 8, !tbaa !14
  %43 = icmp ne ptr %42, null
  br i1 %43, label %49, label %44

44:                                               ; preds = %32
  %45 = load ptr, ptr %8, align 8, !tbaa !9
  %46 = getelementptr inbounds %struct.CMCAllocNode, ptr %45, i32 0, i32 3
  %47 = load ptr, ptr %46, align 8, !tbaa !17
  %48 = load ptr, ptr %10, align 8, !tbaa !9
  call void %47(ptr noundef %48)
  store ptr null, ptr %5, align 8
  store i32 1, ptr %11, align 4
  br label %64

49:                                               ; preds = %32
  %50 = load i64, ptr %6, align 8, !tbaa !5
  %51 = load ptr, ptr %10, align 8, !tbaa !9
  %52 = getelementptr inbounds %struct.Stack, ptr %51, i32 0, i32 1
  store i64 %50, ptr %52, align 8, !tbaa !18
  %53 = load ptr, ptr %10, align 8, !tbaa !9
  %54 = getelementptr inbounds %struct.Stack, ptr %53, i32 0, i32 2
  store i64 0, ptr %54, align 8, !tbaa !19
  %55 = load ptr, ptr %10, align 8, !tbaa !9
  %56 = getelementptr inbounds %struct.Stack, ptr %55, i32 0, i32 3
  store i32 0, ptr %56, align 8, !tbaa !20
  %57 = load ptr, ptr %7, align 8, !tbaa !9
  %58 = load ptr, ptr %10, align 8, !tbaa !9
  %59 = getelementptr inbounds %struct.Stack, ptr %58, i32 0, i32 4
  store ptr %57, ptr %59, align 8, !tbaa !21
  %60 = load ptr, ptr %8, align 8, !tbaa !9
  %61 = load ptr, ptr %10, align 8, !tbaa !9
  %62 = getelementptr inbounds %struct.Stack, ptr %61, i32 0, i32 5
  store ptr %60, ptr %62, align 8, !tbaa !22
  %63 = load ptr, ptr %10, align 8, !tbaa !9
  store ptr %63, ptr %5, align 8
  store i32 1, ptr %11, align 4
  br label %64

64:                                               ; preds = %49, %44, %31
  call void @llvm.lifetime.end.p0(i64 8, ptr %10) #2
  br label %65

65:                                               ; preds = %64, %19, %15
  %66 = load ptr, ptr %5, align 8
  ret ptr %66
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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 = !{!"long", !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 = !{!12, !10, i64 0}
!12 = !{!"CMCAllocNode", !10, i64 0, !10, i64 8, !10, i64 16, !10, i64 24}
!13 = !{!12, !10, i64 8}
!14 = !{!15, !10, i64 0}
!15 = !{!"Stack", !10, i64 0, !6, i64 8, !6, i64 16, !16, i64 24, !10, i64 32, !10, i64 40}
!16 = !{!"int", !7, i64 0}
!17 = !{!12, !10, i64 24}
!18 = !{!15, !6, i64 8}
!19 = !{!15, !6, i64 16}
!20 = !{!15, !16, i64 24}
!21 = !{!15, !10, i64 32}
!22 = !{!15, !10, i64 40}


; 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 @stk_new_custom(i64 noundef %0, ptr noundef %1, ptr noundef %2, ptr nocapture noundef readnone %3) local_unnamed_addr #0 {
  %5 = icmp eq i64 %0, 0
  %.not = icmp eq ptr %1, null
  %or.cond = or i1 %5, %.not
  br i1 %or.cond, label %22, label %6

6:                                                ; preds = %4
  %.not24 = icmp eq ptr %2, null
  %spec.store.select = select i1 %.not24, ptr @cmc_alloc_node_default, ptr %2
  %7 = load ptr, ptr %spec.store.select, align 8, !tbaa !5
  %8 = tail call ptr %7(i64 noundef 48) #1
  %.not25 = icmp eq ptr %8, null
  br i1 %.not25, label %22, label %9

9:                                                ; preds = %6
  %10 = getelementptr inbounds i8, ptr %spec.store.select, i64 8
  %11 = load ptr, ptr %10, align 8, !tbaa !10
  %12 = tail call ptr %11(i64 noundef %0, i64 noundef 8) #1
  store ptr %12, ptr %8, align 8, !tbaa !11
  %.not26 = icmp eq ptr %12, null
  br i1 %.not26, label %13, label %16

13:                                               ; preds = %9
  %14 = getelementptr inbounds i8, ptr %spec.store.select, i64 24
  %15 = load ptr, ptr %14, align 8, !tbaa !15
  tail call void %15(ptr noundef nonnull %8) #1
  br label %22

16:                                               ; preds = %9
  %17 = getelementptr inbounds i8, ptr %8, i64 8
  store i64 %0, ptr %17, align 8, !tbaa !16
  %18 = getelementptr inbounds i8, ptr %8, i64 16
  store i64 0, ptr %18, align 8, !tbaa !17
  %19 = getelementptr inbounds i8, ptr %8, i64 24
  store i32 0, ptr %19, align 8, !tbaa !18
  %20 = getelementptr inbounds i8, ptr %8, i64 32
  store ptr %1, ptr %20, align 8, !tbaa !19
  %21 = getelementptr inbounds i8, ptr %8, i64 40
  store ptr %spec.store.select, ptr %21, align 8, !tbaa !20
  br label %22

22:                                               ; preds = %13, %16, %6, %4
  %.1 = phi ptr [ null, %4 ], [ %8, %16 ], [ null, %13 ], [ null, %6 ]
  ret ptr %.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 = { 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 = !{!6, !7, i64 8}
!11 = !{!12, !7, i64 0}
!12 = !{!"Stack", !7, i64 0, !13, i64 8, !13, i64 16, !14, i64 24, !7, i64 32, !7, i64 40}
!13 = !{!"long", !8, i64 0}
!14 = !{!"int", !8, i64 0}
!15 = !{!6, !7, i64 24}
!16 = !{!12, !13, i64 8}
!17 = !{!12, !13, i64 16}
!18 = !{!12, !14, i64 24}
!19 = !{!12, !7, i64 32}
!20 = !{!12, !7, i64 40}


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