; LLVM IR from Water-Melon/Melon :: src (mln_stack)

; 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.mln_stack_t = type { ptr, ptr, ptr, ptr, i64, ptr, ptr }
%struct.mln_stack_node_s = type { ptr, ptr, ptr }

; 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 i32 @mln_stack_iterate(ptr noundef nonnull %0, ptr noundef %1, ptr noundef %2) #1 {
  %4 = alloca i32, align 4
  %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
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  %10 = load ptr, ptr %5, align 8, !tbaa !5
  %11 = getelementptr inbounds %struct.mln_stack_t, ptr %10, i32 0, i32 1
  %12 = load ptr, ptr %11, align 8, !tbaa !9
  store ptr %12, ptr %8, align 8, !tbaa !5
  br label %13

13:                                               ; preds = %26, %3
  %14 = load ptr, ptr %8, align 8, !tbaa !5
  %15 = icmp ne ptr %14, null
  br i1 %15, label %16, label %30

16:                                               ; preds = %13
  %17 = load ptr, ptr %6, align 8, !tbaa !5
  %18 = load ptr, ptr %8, align 8, !tbaa !5
  %19 = getelementptr inbounds %struct.mln_stack_node_s, ptr %18, i32 0, i32 0
  %20 = load ptr, ptr %19, align 8, !tbaa !12
  %21 = load ptr, ptr %7, align 8, !tbaa !5
  %22 = call i32 %17(ptr noundef %20, ptr noundef %21)
  %23 = icmp slt i32 %22, 0
  br i1 %23, label %24, label %25

24:                                               ; preds = %16
  store i32 -1, ptr %4, align 4
  store i32 1, ptr %9, align 4
  br label %31

25:                                               ; preds = %16
  br label %26

26:                                               ; preds = %25
  %27 = load ptr, ptr %8, align 8, !tbaa !5
  %28 = getelementptr inbounds %struct.mln_stack_node_s, ptr %27, i32 0, i32 1
  %29 = load ptr, ptr %28, align 8, !tbaa !14
  store ptr %29, ptr %8, align 8, !tbaa !5
  br label %13, !llvm.loop !15

30:                                               ; preds = %13
  store i32 0, ptr %4, align 4
  store i32 1, ptr %9, align 4
  br label %31

31:                                               ; preds = %30, %24
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  %32 = load i32, ptr %4, align 4
  ret i32 %32
}

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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !6, i64 8}
!10 = !{!"", !6, i64 0, !6, i64 8, !6, i64 16, !6, i64 24, !11, i64 32, !6, i64 40, !6, i64 48}
!11 = !{!"long", !7, i64 0}
!12 = !{!13, !6, i64 0}
!13 = !{!"mln_stack_node_s", !6, i64 0, !6, i64 8, !6, i64 16}
!14 = !{!13, !6, i64 8}
!15 = distinct !{!15, !16}
!16 = !{!"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: nounwind uwtable
define dso_local range(i32 -1, 1) i32 @mln_stack_iterate(ptr nocapture noundef nonnull readonly %0, ptr nocapture noundef readonly %1, ptr noundef %2) local_unnamed_addr #0 {
  br label %4

4:                                                ; preds = %5, %3
  %.pn = phi ptr [ %0, %3 ], [ %.0, %5 ]
  %.0.in = getelementptr inbounds i8, ptr %.pn, i64 8
  %.0 = load ptr, ptr %.0.in, align 8, !tbaa !5
  %.not = icmp eq ptr %.0, null
  br i1 %.not, label %9, label %5

5:                                                ; preds = %4
  %6 = load ptr, ptr %.0, align 8, !tbaa !9
  %7 = tail call i32 %1(ptr noundef %6, ptr noundef %2) #1
  %8 = icmp slt i32 %7, 0
  br i1 %8, label %9, label %4, !llvm.loop !11

9:                                                ; preds = %4, %5
  %.06 = phi i32 [ -1, %5 ], [ 0, %4 ]
  ret i32 %.06
}

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, !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 = !{!"mln_stack_node_s", !6, i64 0, !6, i64 8, !6, i64 16}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


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