; LLVM IR from yudi-matsuzake/libgenerics :: src (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.stack_t = type { i64, i64, ptr }
%struct.snode_t = type { ptr, ptr, ptr }

; Function Attrs: nounwind uwtable
define dso_local i32 @stack_push(ptr noundef %0, ptr noundef %1) #0 {
  %3 = alloca i32, align 4
  %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
  %7 = load ptr, ptr %4, align 8, !tbaa !5
  %8 = icmp ne ptr %7, null
  br i1 %8, label %10, label %9

9:                                                ; preds = %2
  store i32 1, ptr %3, align 4
  br label %57

10:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #4
  %11 = call noalias ptr @malloc(i64 noundef 24) #5
  store ptr %11, ptr %6, align 8, !tbaa !5
  %12 = load ptr, ptr %4, align 8, !tbaa !5
  %13 = getelementptr inbounds %struct.stack_t, ptr %12, i32 0, i32 1
  %14 = load i64, ptr %13, align 8, !tbaa !9
  %15 = icmp ne i64 %14, 0
  br i1 %15, label %16, label %23

16:                                               ; preds = %10
  %17 = load ptr, ptr %4, align 8, !tbaa !5
  %18 = getelementptr inbounds %struct.stack_t, ptr %17, i32 0, i32 1
  %19 = load i64, ptr %18, align 8, !tbaa !9
  %20 = call noalias ptr @malloc(i64 noundef %19) #5
  %21 = load ptr, ptr %6, align 8, !tbaa !5
  %22 = getelementptr inbounds %struct.snode_t, ptr %21, i32 0, i32 2
  store ptr %20, ptr %22, align 8, !tbaa !12
  br label %26

23:                                               ; preds = %10
  %24 = load ptr, ptr %6, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.snode_t, ptr %24, i32 0, i32 2
  store ptr null, ptr %25, align 8, !tbaa !12
  br label %26

26:                                               ; preds = %23, %16
  %27 = load ptr, ptr %6, align 8, !tbaa !5
  %28 = getelementptr inbounds %struct.snode_t, ptr %27, i32 0, i32 1
  store ptr null, ptr %28, align 8, !tbaa !14
  %29 = load ptr, ptr %4, align 8, !tbaa !5
  %30 = getelementptr inbounds %struct.stack_t, ptr %29, i32 0, i32 2
  %31 = load ptr, ptr %30, align 8, !tbaa !15
  %32 = load ptr, ptr %6, align 8, !tbaa !5
  %33 = getelementptr inbounds %struct.snode_t, ptr %32, i32 0, i32 0
  store ptr %31, ptr %33, align 8, !tbaa !16
  %34 = load ptr, ptr %4, align 8, !tbaa !5
  %35 = getelementptr inbounds %struct.stack_t, ptr %34, i32 0, i32 1
  %36 = load i64, ptr %35, align 8, !tbaa !9
  %37 = icmp ne i64 %36, 0
  br i1 %37, label %38, label %49

38:                                               ; preds = %26
  %39 = load ptr, ptr %5, align 8, !tbaa !5
  %40 = icmp ne ptr %39, null
  br i1 %40, label %41, label %49

41:                                               ; preds = %38
  %42 = load ptr, ptr %6, align 8, !tbaa !5
  %43 = getelementptr inbounds %struct.snode_t, ptr %42, i32 0, i32 2
  %44 = load ptr, ptr %43, align 8, !tbaa !12
  %45 = load ptr, ptr %5, align 8, !tbaa !5
  %46 = load ptr, ptr %4, align 8, !tbaa !5
  %47 = getelementptr inbounds %struct.stack_t, ptr %46, i32 0, i32 1
  %48 = load i64, ptr %47, align 8, !tbaa !9
  call void @llvm.memcpy.p0.p0.i64(ptr align 1 %44, ptr align 1 %45, i64 %48, i1 false)
  br label %49

49:                                               ; preds = %41, %38, %26
  %50 = load ptr, ptr %6, align 8, !tbaa !5
  %51 = load ptr, ptr %4, align 8, !tbaa !5
  %52 = getelementptr inbounds %struct.stack_t, ptr %51, i32 0, i32 2
  store ptr %50, ptr %52, align 8, !tbaa !15
  %53 = load ptr, ptr %4, align 8, !tbaa !5
  %54 = getelementptr inbounds %struct.stack_t, ptr %53, i32 0, i32 0
  %55 = load i64, ptr %54, align 8, !tbaa !17
  %56 = add i64 %55, 1
  store i64 %56, ptr %54, align 8, !tbaa !17
  store i32 0, ptr %3, align 4
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #4
  br label %57

57:                                               ; preds = %49, %9
  %58 = load i32, ptr %3, align 4
  ret i32 %58
}

; 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: nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #3

; 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 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #4 = { nounwind }
attributes #5 = { 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, !11, i64 8}
!10 = !{!"stack_t", !11, i64 0, !11, i64 8, !6, i64 16}
!11 = !{!"long", !7, i64 0}
!12 = !{!13, !6, i64 16}
!13 = !{!"snode_t", !6, i64 0, !6, i64 8, !6, i64 16}
!14 = !{!13, !6, i64 8}
!15 = !{!10, !6, i64 16}
!16 = !{!13, !6, i64 0}
!17 = !{!10, !11, 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"

; Function Attrs: mustprogress nofree nounwind willreturn uwtable
define dso_local range(i32 0, 2) i32 @stack_push(ptr noundef %0, ptr noundef readonly %1) local_unnamed_addr #0 {
  %.not = icmp eq ptr %0, null
  br i1 %.not, label %21, label %3

3:                                                ; preds = %2
  %4 = tail call noalias dereferenceable_or_null(24) ptr @malloc(i64 noundef 24) #4
  %5 = getelementptr inbounds i8, ptr %0, i64 8
  %6 = load i64, ptr %5, align 8, !tbaa !5
  %.not21 = icmp eq i64 %6, 0
  br i1 %.not21, label %.thread, label %10

.thread:                                          ; preds = %3
  %7 = getelementptr inbounds i8, ptr %4, i64 8
  %8 = getelementptr inbounds i8, ptr %0, i64 16
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 8 dereferenceable(16) %7, i8 0, i64 16, i1 false)
  %9 = load ptr, ptr %8, align 8, !tbaa !11
  store ptr %9, ptr %4, align 8, !tbaa !12
  br label %17

10:                                               ; preds = %3
  %11 = tail call noalias ptr @malloc(i64 noundef %6) #4
  %12 = getelementptr inbounds i8, ptr %4, i64 16
  store ptr %11, ptr %12, align 8, !tbaa !14
  %13 = getelementptr inbounds i8, ptr %4, i64 8
  store ptr null, ptr %13, align 8, !tbaa !15
  %14 = getelementptr inbounds i8, ptr %0, i64 16
  %15 = load ptr, ptr %14, align 8, !tbaa !11
  store ptr %15, ptr %4, align 8, !tbaa !12
  %.not23 = icmp eq ptr %1, null
  br i1 %.not23, label %17, label %16

16:                                               ; preds = %10
  tail call void @llvm.memcpy.p0.p0.i64(ptr align 1 %11, ptr nonnull align 1 %1, i64 %6, i1 false)
  br label %17

17:                                               ; preds = %.thread, %16, %10
  %18 = phi ptr [ %8, %.thread ], [ %14, %16 ], [ %14, %10 ]
  store ptr %4, ptr %18, align 8, !tbaa !11
  %19 = load i64, ptr %0, align 8, !tbaa !16
  %20 = add i64 %19, 1
  store i64 %20, ptr %0, align 8, !tbaa !16
  br label %21

21:                                               ; preds = %2, %17
  %.0 = phi i32 [ 0, %17 ], [ 1, %2 ]
  ret i32 %.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: mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #2

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #3

attributes #0 = { mustprogress nofree nounwind willreturn 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 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { nocallback nofree nounwind willreturn memory(argmem: write) }
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, !7, i64 8}
!6 = !{!"stack_t", !7, i64 0, !7, i64 8, !10, i64 16}
!7 = !{!"long", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!6, !10, i64 16}
!12 = !{!13, !10, i64 0}
!13 = !{!"snode_t", !10, i64 0, !10, i64 8, !10, i64 16}
!14 = !{!13, !10, i64 16}
!15 = !{!13, !10, i64 8}
!16 = !{!6, !7, i64 0}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,MemCpyOptPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass