; LLVM IR from yourtion/LearningMasteringAlgorithms-C :: source (set)

; 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.List_ = type { i32, ptr, ptr, ptr, ptr }
%struct.ListElmt_ = type { ptr, ptr }

; Function Attrs: nounwind uwtable
declare dso_local void @set_init(ptr noundef, ptr noundef, ptr noundef) #0

; Function Attrs: nounwind uwtable
declare dso_local i32 @set_is_member(ptr noundef, ptr noundef) #0

declare i32 @list_ins_next(ptr noundef, ptr noundef, ptr noundef) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

declare void @list_destroy(ptr noundef) #1

; Function Attrs: nounwind uwtable
define dso_local i32 @set_difference(ptr noundef %0, ptr noundef %1, ptr noundef %2) #0 {
  %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 ptr, align 8
  %10 = 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) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #3
  %11 = load ptr, ptr %5, align 8, !tbaa !5
  %12 = load ptr, ptr %6, align 8, !tbaa !5
  %13 = getelementptr inbounds %struct.List_, ptr %12, i32 0, i32 1
  %14 = load ptr, ptr %13, align 8, !tbaa !9
  call void @set_init(ptr noundef %11, ptr noundef %14, ptr noundef null)
  %15 = load ptr, ptr %6, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct.List_, ptr %15, i32 0, i32 3
  %17 = load ptr, ptr %16, align 8, !tbaa !12
  store ptr %17, ptr %8, align 8, !tbaa !5
  br label %18

18:                                               ; preds = %43, %3
  %19 = load ptr, ptr %8, align 8, !tbaa !5
  %20 = icmp ne ptr %19, null
  br i1 %20, label %21, label %47

21:                                               ; preds = %18
  %22 = load ptr, ptr %7, align 8, !tbaa !5
  %23 = load ptr, ptr %8, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct.ListElmt_, ptr %23, i32 0, i32 0
  %25 = load ptr, ptr %24, align 8, !tbaa !13
  %26 = call i32 @set_is_member(ptr noundef %22, ptr noundef %25)
  %27 = icmp ne i32 %26, 0
  br i1 %27, label %42, label %28

28:                                               ; preds = %21
  %29 = load ptr, ptr %8, align 8, !tbaa !5
  %30 = getelementptr inbounds %struct.ListElmt_, ptr %29, i32 0, i32 0
  %31 = load ptr, ptr %30, align 8, !tbaa !13
  store ptr %31, ptr %9, align 8, !tbaa !5
  %32 = load ptr, ptr %5, align 8, !tbaa !5
  %33 = load ptr, ptr %5, align 8, !tbaa !5
  %34 = getelementptr inbounds %struct.List_, ptr %33, i32 0, i32 4
  %35 = load ptr, ptr %34, align 8, !tbaa !15
  %36 = load ptr, ptr %9, align 8, !tbaa !5
  %37 = call i32 @list_ins_next(ptr noundef %32, ptr noundef %35, ptr noundef %36)
  %38 = icmp ne i32 %37, 0
  br i1 %38, label %39, label %41

39:                                               ; preds = %28
  %40 = load ptr, ptr %5, align 8, !tbaa !5
  call void @list_destroy(ptr noundef %40)
  store i32 -1, ptr %4, align 4
  store i32 1, ptr %10, align 4
  br label %48

41:                                               ; preds = %28
  br label %42

42:                                               ; preds = %41, %21
  br label %43

43:                                               ; preds = %42
  %44 = load ptr, ptr %8, align 8, !tbaa !5
  %45 = getelementptr inbounds %struct.ListElmt_, ptr %44, i32 0, i32 1
  %46 = load ptr, ptr %45, align 8, !tbaa !16
  store ptr %46, ptr %8, align 8, !tbaa !5
  br label %18, !llvm.loop !17

47:                                               ; preds = %18
  store i32 0, ptr %4, align 4
  store i32 1, ptr %10, align 4
  br label %48

48:                                               ; preds = %47, %39
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #3
  %49 = load i32, ptr %4, align 4
  ret i32 %49
}

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 = { "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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { 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 = !{!"List_", !11, i64 0, !6, i64 8, !6, i64 16, !6, i64 24, !6, i64 32}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 24}
!13 = !{!14, !6, i64 0}
!14 = !{!"ListElmt_", !6, i64 0, !6, i64 8}
!15 = !{!10, !6, i64 32}
!16 = !{!14, !6, i64 8}
!17 = distinct !{!17, !18}
!18 = !{!"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
declare dso_local void @set_init(ptr noundef, ptr noundef, ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local i32 @set_is_member(ptr noundef, ptr noundef) local_unnamed_addr #0

declare i32 @list_ins_next(ptr noundef, ptr noundef, ptr noundef) local_unnamed_addr #1

declare void @list_destroy(ptr noundef) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
define dso_local range(i32 -1, 1) i32 @set_difference(ptr noundef %0, ptr nocapture noundef readonly %1, ptr noundef %2) local_unnamed_addr #0 {
  %4 = getelementptr inbounds i8, ptr %1, i64 8
  %5 = load ptr, ptr %4, align 8, !tbaa !5
  tail call void @set_init(ptr noundef %0, ptr noundef %5, ptr noundef null)
  %6 = getelementptr inbounds i8, ptr %1, i64 24
  %.01215 = load ptr, ptr %6, align 8, !tbaa !11
  %.not16 = icmp eq ptr %.01215, null
  br i1 %.not16, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %3
  %7 = getelementptr inbounds i8, ptr %0, i64 32
  br label %8

8:                                                ; preds = %.lr.ph, %16
  %.01217 = phi ptr [ %.01215, %.lr.ph ], [ %.012, %16 ]
  %9 = load ptr, ptr %.01217, align 8, !tbaa !12
  %10 = tail call i32 @set_is_member(ptr noundef %2, ptr noundef %9)
  %.not13 = icmp eq i32 %10, 0
  br i1 %.not13, label %11, label %16

11:                                               ; preds = %8
  %12 = load ptr, ptr %.01217, align 8, !tbaa !12
  %13 = load ptr, ptr %7, align 8, !tbaa !14
  %14 = tail call i32 @list_ins_next(ptr noundef %0, ptr noundef %13, ptr noundef %12) #2
  %.not14 = icmp eq i32 %14, 0
  br i1 %.not14, label %16, label %15

15:                                               ; preds = %11
  tail call void @list_destroy(ptr noundef nonnull %0) #2
  br label %.loopexit

16:                                               ; preds = %8, %11
  %17 = getelementptr inbounds i8, ptr %.01217, i64 8
  %.012 = load ptr, ptr %17, align 8, !tbaa !11
  %.not = icmp eq ptr %.012, null
  br i1 %.not, label %.loopexit, label %8, !llvm.loop !15

.loopexit:                                        ; preds = %16, %3, %15
  %.0 = phi i32 [ -1, %15 ], [ 0, %3 ], [ 0, %16 ]
  ret i32 %.0
}

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 = { "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, !10, i64 8}
!6 = !{!"List_", !7, i64 0, !10, i64 8, !10, i64 16, !10, i64 24, !10, i64 32}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!10, !10, i64 0}
!12 = !{!13, !10, i64 0}
!13 = !{!"ListElmt_", !10, i64 0, !10, i64 8}
!14 = !{!6, !10, i64 32}
!15 = distinct !{!15, !16}
!16 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass