; LLVM IR from HarshCasper/NeoAlgo :: C/ds (Hashtable_chaining)

; 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.HashTable = type { i32, ptr }

; Function Attrs: nounwind uwtable
declare dso_local i32 @hashingFunction(i32 noundef) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nounwind uwtable
define dso_local i32 @does_exist(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca ptr, align 8
  %8 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  %9 = load i32, ptr %5, align 4, !tbaa !9
  %10 = call i32 @hashingFunction(i32 noundef %9)
  store i32 %10, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  %11 = load ptr, ptr %4, align 8, !tbaa !5
  %12 = load i32, ptr %6, align 4, !tbaa !9
  %13 = sext i32 %12 to i64
  %14 = getelementptr inbounds %struct.HashTable, ptr %11, i64 %13
  store ptr %14, ptr %7, align 8, !tbaa !5
  br label %15

15:                                               ; preds = %30, %2
  %16 = load ptr, ptr %7, align 8, !tbaa !5
  %17 = getelementptr inbounds %struct.HashTable, ptr %16, i32 0, i32 1
  %18 = load ptr, ptr %17, align 8, !tbaa !11
  %19 = icmp ne ptr %18, null
  br i1 %19, label %20, label %31

20:                                               ; preds = %15
  %21 = load ptr, ptr %7, align 8, !tbaa !5
  %22 = getelementptr inbounds %struct.HashTable, ptr %21, i32 0, i32 1
  %23 = load ptr, ptr %22, align 8, !tbaa !11
  store ptr %23, ptr %7, align 8, !tbaa !5
  %24 = load ptr, ptr %7, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.HashTable, ptr %24, i32 0, i32 0
  %26 = load i32, ptr %25, align 8, !tbaa !13
  %27 = load i32, ptr %5, align 4, !tbaa !9
  %28 = icmp eq i32 %26, %27
  br i1 %28, label %29, label %30

29:                                               ; preds = %20
  store i32 1, ptr %3, align 4
  store i32 1, ptr %8, align 4
  br label %32

30:                                               ; preds = %20
  br label %15, !llvm.loop !14

31:                                               ; preds = %15
  store i32 0, ptr %3, align 4
  store i32 1, ptr %8, align 4
  br label %32

32:                                               ; preds = %31, %29
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  %33 = load i32, ptr %3, align 4
  ret i32 %33
}

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 }

!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, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !6, i64 8}
!12 = !{!"HashTable", !10, i64 0, !6, i64 8}
!13 = !{!12, !10, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"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"

%struct.HashTable = type { i32, ptr }

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

; Function Attrs: nounwind uwtable
define dso_local range(i32 0, 2) i32 @does_exist(ptr nocapture noundef readonly %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = tail call i32 @hashingFunction(i32 noundef %1)
  %4 = sext i32 %3 to i64
  %5 = getelementptr inbounds %struct.HashTable, ptr %0, i64 %4
  br label %6

6:                                                ; preds = %9, %2
  %.0 = phi ptr [ %5, %2 ], [ %8, %9 ]
  %7 = getelementptr inbounds i8, ptr %.0, i64 8
  %8 = load ptr, ptr %7, align 8, !tbaa !5
  %.not = icmp eq ptr %8, null
  br i1 %.not, label %12, label %9

9:                                                ; preds = %6
  %10 = load i32, ptr %8, align 8, !tbaa !11
  %11 = icmp eq i32 %10, %1
  br i1 %11, label %12, label %6, !llvm.loop !12

12:                                               ; preds = %6, %9
  %.07 = phi i32 [ 1, %9 ], [ 0, %6 ]
  ret i32 %.07
}

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, !10, i64 8}
!6 = !{!"HashTable", !7, i64 0, !10, i64 8}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!6, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}


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