; 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: nounwind uwtable
define dso_local void @stk_customize(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
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store ptr %2, ptr %6, align 8, !tbaa !5
  %7 = load ptr, ptr %6, align 8, !tbaa !5
  %8 = load ptr, ptr %5, align 8, !tbaa !5
  %9 = icmp ne ptr %8, null
  br i1 %9, label %13, label %10

10:                                               ; preds = %3
  %11 = load ptr, ptr %4, align 8, !tbaa !5
  %12 = getelementptr inbounds %struct.Stack, ptr %11, i32 0, i32 5
  store ptr @cmc_alloc_node_default, ptr %12, align 8, !tbaa !9
  br label %17

13:                                               ; preds = %3
  %14 = load ptr, ptr %5, align 8, !tbaa !5
  %15 = load ptr, ptr %4, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct.Stack, ptr %15, i32 0, i32 5
  store ptr %14, ptr %16, align 8, !tbaa !9
  br label %17

17:                                               ; preds = %13, %10
  %18 = load ptr, ptr %4, align 8, !tbaa !5
  %19 = getelementptr inbounds %struct.Stack, ptr %18, i32 0, i32 3
  store i32 0, ptr %19, align 8, !tbaa !13
  ret void
}

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" }

!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 40}
!10 = !{!"Stack", !6, i64 0, !11, i64 8, !11, i64 16, !12, i64 24, !6, i64 32, !6, i64 40}
!11 = !{!"long", !7, i64 0}
!12 = !{!"int", !7, i64 0}
!13 = !{!10, !12, i64 24}


; 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: mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: write) uwtable
define dso_local void @stk_customize(ptr nocapture noundef writeonly %0, ptr noundef %1, ptr nocapture noundef readnone %2) local_unnamed_addr #0 {
  %.not = icmp eq ptr %1, null
  %spec.select = select i1 %.not, ptr @cmc_alloc_node_default, ptr %1
  %4 = getelementptr inbounds i8, ptr %0, i64 40
  store ptr %spec.select, ptr %4, align 8
  %5 = getelementptr inbounds i8, ptr %0, i64 24
  store i32 0, ptr %5, align 8, !tbaa !5
  ret void
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: write) 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 = !{!6, !11, i64 24}
!6 = !{!"Stack", !7, i64 0, !10, i64 8, !10, i64 16, !11, i64 24, !7, i64 32, !7, i64 40}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"long", !8, i64 0}
!11 = !{!"int", !8, i64 0}


; Effective O3 passes: GlobalOptPass,InstCombinePass,JumpThreadingPass,MergedLoadStoreMotionPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass