; LLVM IR from sameerkavthekar/garbage-collector :: src (hashmap)

; 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.hash_map = type { ptr, i32 }
%struct.hash_node = 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
declare dso_local i32 @hash_function(ptr noundef) #1

; Function Attrs: nounwind uwtable
define dso_local i32 @remove_node(ptr noundef %0, ptr noundef %1) #1 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca ptr, align 8
  %8 = alloca i32, align 4
  %9 = alloca ptr, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  %10 = load ptr, ptr %5, align 8, !tbaa !5
  %11 = call i32 @hash_function(ptr noundef %10)
  %12 = load ptr, ptr %4, align 8, !tbaa !5
  %13 = getelementptr inbounds %struct.hash_map, ptr %12, i32 0, i32 1
  %14 = load i32, ptr %13, align 8, !tbaa !9
  %15 = sub nsw i32 %14, 1
  %16 = and i32 %11, %15
  store i32 %16, ptr %6, align 4, !tbaa !12
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #3
  %17 = load ptr, ptr %4, align 8, !tbaa !5
  %18 = getelementptr inbounds %struct.hash_map, ptr %17, i32 0, i32 0
  %19 = load ptr, ptr %18, align 8, !tbaa !13
  %20 = load i32, ptr %6, align 4, !tbaa !12
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds ptr, ptr %19, i64 %21
  %23 = load ptr, ptr %22, align 8, !tbaa !5
  store ptr %23, ptr %7, align 8, !tbaa !5
  %24 = load ptr, ptr %7, align 8, !tbaa !5
  %25 = icmp ne ptr %24, null
  br i1 %25, label %27, label %26

26:                                               ; preds = %2
  store i32 0, ptr %3, align 4
  store i32 1, ptr %8, align 4
  br label %86

27:                                               ; preds = %2
  %28 = load ptr, ptr %7, align 8, !tbaa !5
  %29 = getelementptr inbounds %struct.hash_node, ptr %28, i32 0, i32 1
  %30 = load ptr, ptr %29, align 8, !tbaa !14
  %31 = load ptr, ptr %5, align 8, !tbaa !5
  %32 = icmp eq ptr %30, %31
  br i1 %32, label %33, label %44

33:                                               ; preds = %27
  %34 = load ptr, ptr %7, align 8, !tbaa !5
  %35 = getelementptr inbounds %struct.hash_node, ptr %34, i32 0, i32 2
  %36 = load ptr, ptr %35, align 8, !tbaa !16
  %37 = load ptr, ptr %4, align 8, !tbaa !5
  %38 = getelementptr inbounds %struct.hash_map, ptr %37, i32 0, i32 0
  %39 = load ptr, ptr %38, align 8, !tbaa !13
  %40 = load i32, ptr %6, align 4, !tbaa !12
  %41 = sext i32 %40 to i64
  %42 = getelementptr inbounds ptr, ptr %39, i64 %41
  store ptr %36, ptr %42, align 8, !tbaa !5
  %43 = load ptr, ptr %7, align 8, !tbaa !5
  call void @free(ptr noundef %43) #3
  store i32 1, ptr %3, align 4
  store i32 1, ptr %8, align 4
  br label %86

44:                                               ; preds = %27
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #3
  store ptr null, ptr %9, align 8, !tbaa !5
  br label %45

45:                                               ; preds = %61, %44
  %46 = load ptr, ptr %7, align 8, !tbaa !5
  %47 = icmp ne ptr %46, null
  br i1 %47, label %48, label %66

48:                                               ; preds = %45
  %49 = load ptr, ptr %7, align 8, !tbaa !5
  %50 = getelementptr inbounds %struct.hash_node, ptr %49, i32 0, i32 1
  %51 = load ptr, ptr %50, align 8, !tbaa !14
  %52 = load ptr, ptr %5, align 8, !tbaa !5
  %53 = icmp eq ptr %51, %52
  br i1 %53, label %54, label %61

54:                                               ; preds = %48
  %55 = load ptr, ptr %7, align 8, !tbaa !5
  %56 = getelementptr inbounds %struct.hash_node, ptr %55, i32 0, i32 2
  %57 = load ptr, ptr %56, align 8, !tbaa !16
  %58 = load ptr, ptr %9, align 8, !tbaa !5
  %59 = getelementptr inbounds %struct.hash_node, ptr %58, i32 0, i32 2
  store ptr %57, ptr %59, align 8, !tbaa !16
  %60 = load ptr, ptr %7, align 8, !tbaa !5
  call void @free(ptr noundef %60) #3
  store i32 1, ptr %3, align 4
  store i32 1, ptr %8, align 4
  br label %85

61:                                               ; preds = %48
  %62 = load ptr, ptr %7, align 8, !tbaa !5
  store ptr %62, ptr %9, align 8, !tbaa !5
  %63 = load ptr, ptr %7, align 8, !tbaa !5
  %64 = getelementptr inbounds %struct.hash_node, ptr %63, i32 0, i32 2
  %65 = load ptr, ptr %64, align 8, !tbaa !16
  store ptr %65, ptr %7, align 8, !tbaa !5
  br label %45, !llvm.loop !17

66:                                               ; preds = %45
  %67 = load ptr, ptr %9, align 8, !tbaa !5
  %68 = icmp ne ptr %67, null
  br i1 %68, label %84, label %69

69:                                               ; preds = %66
  %70 = load ptr, ptr %7, align 8, !tbaa !5
  %71 = getelementptr inbounds %struct.hash_node, ptr %70, i32 0, i32 1
  %72 = load ptr, ptr %71, align 8, !tbaa !14
  %73 = load ptr, ptr %5, align 8, !tbaa !5
  %74 = icmp eq ptr %72, %73
  br i1 %74, label %75, label %83

75:                                               ; preds = %69
  %76 = load ptr, ptr %4, align 8, !tbaa !5
  %77 = getelementptr inbounds %struct.hash_map, ptr %76, i32 0, i32 0
  %78 = load ptr, ptr %77, align 8, !tbaa !13
  %79 = load i32, ptr %6, align 4, !tbaa !12
  %80 = sext i32 %79 to i64
  %81 = getelementptr inbounds ptr, ptr %78, i64 %80
  store ptr null, ptr %81, align 8, !tbaa !5
  %82 = load ptr, ptr %7, align 8, !tbaa !5
  call void @free(ptr noundef %82) #3
  store i32 1, ptr %3, align 4
  store i32 1, ptr %8, align 4
  br label %85

83:                                               ; preds = %69
  br label %84

84:                                               ; preds = %83, %66
  store i32 0, ptr %3, align 4
  store i32 1, ptr %8, align 4
  br label %85

85:                                               ; preds = %84, %75, %54
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #3
  br label %86

86:                                               ; preds = %85, %33, %26
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  %87 = load i32, ptr %3, align 4
  ret i32 %87
}

; Function Attrs: nounwind
declare void @free(ptr noundef) #2

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 "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 = { 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, !11, i64 8}
!10 = !{!"hash_map", !6, i64 0, !11, i64 8}
!11 = !{!"int", !7, i64 0}
!12 = !{!11, !11, i64 0}
!13 = !{!10, !6, i64 0}
!14 = !{!15, !6, i64 8}
!15 = !{!"hash_node", !6, i64 0, !6, i64 8, !6, i64 16}
!16 = !{!15, !6, i64 16}
!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 i32 @hash_function(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local range(i32 0, 2) i32 @remove_node(ptr nocapture noundef readonly %0, ptr noundef %1) local_unnamed_addr #0 {
  %3 = tail call i32 @hash_function(ptr noundef %1)
  %4 = getelementptr inbounds i8, ptr %0, i64 8
  %5 = load i32, ptr %4, align 8, !tbaa !5
  %6 = add nsw i32 %5, -1
  %7 = and i32 %6, %3
  %8 = load ptr, ptr %0, align 8, !tbaa !11
  %9 = sext i32 %7 to i64
  %10 = getelementptr inbounds ptr, ptr %8, i64 %9
  %11 = load ptr, ptr %10, align 8, !tbaa !12
  %.not = icmp eq ptr %11, null
  br i1 %.not, label %.loopexit, label %12

12:                                               ; preds = %2
  %13 = getelementptr inbounds i8, ptr %11, i64 8
  %14 = load ptr, ptr %13, align 8, !tbaa !13
  %15 = icmp eq ptr %14, %1
  br i1 %15, label %19, label %.preheader.preheader

.preheader.preheader:                             ; preds = %12
  %16 = getelementptr inbounds i8, ptr %11, i64 8
  %17 = load ptr, ptr %16, align 8, !tbaa !13
  %18 = icmp ne ptr %17, %1
  tail call void @llvm.assume(i1 %18)
  br label %.lr.ph

19:                                               ; preds = %12
  %20 = getelementptr inbounds i8, ptr %11, i64 16
  %21 = load ptr, ptr %20, align 8, !tbaa !15
  store ptr %21, ptr %10, align 8, !tbaa !12
  br label %.loopexit.sink.split

.preheader:                                       ; preds = %.lr.ph
  %22 = getelementptr inbounds i8, ptr %29, i64 8
  %23 = load ptr, ptr %22, align 8, !tbaa !13
  %24 = icmp eq ptr %23, %1
  br i1 %24, label %.preheader._crit_edge, label %.lr.ph, !llvm.loop !16

.preheader._crit_edge:                            ; preds = %.preheader
  %25 = getelementptr inbounds i8, ptr %29, i64 16
  %26 = load ptr, ptr %25, align 8, !tbaa !15
  %27 = getelementptr inbounds i8, ptr %.0253341, i64 16
  store ptr %26, ptr %27, align 8, !tbaa !15
  br label %.loopexit.sink.split

.lr.ph:                                           ; preds = %.preheader.preheader, %.preheader
  %.0253341 = phi ptr [ %29, %.preheader ], [ %11, %.preheader.preheader ]
  %28 = getelementptr inbounds i8, ptr %.0253341, i64 16
  %29 = load ptr, ptr %28, align 8, !tbaa !15
  %.not29 = icmp eq ptr %29, null
  br i1 %.not29, label %.loopexit, label %.preheader, !llvm.loop !16

.loopexit.sink.split:                             ; preds = %19, %.preheader._crit_edge
  %.02533.lcssa.sink = phi ptr [ %29, %.preheader._crit_edge ], [ %11, %19 ]
  tail call void @free(ptr noundef nonnull %.02533.lcssa.sink) #3
  br label %.loopexit

.loopexit:                                        ; preds = %.lr.ph, %.loopexit.sink.split, %2
  %.1 = phi i32 [ 0, %2 ], [ 1, %.loopexit.sink.split ], [ 0, %.lr.ph ]
  ret i32 %.1
}

; Function Attrs: mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite)
declare void @free(ptr allocptr nocapture noundef) local_unnamed_addr #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: write)
declare void @llvm.assume(i1 noundef) #2

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 = { mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, 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 = { nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: write) }
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, !10, i64 8}
!6 = !{!"hash_map", !7, i64 0, !10, i64 8}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = !{!6, !7, i64 0}
!12 = !{!7, !7, i64 0}
!13 = !{!14, !7, i64 8}
!14 = !{!"hash_node", !7, i64 0, !7, i64 8, !7, i64 16}
!15 = !{!14, !7, i64 16}
!16 = distinct !{!16, !17}
!17 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SCCPPass,SROAPass,SimplifyCFGPass,TailCallElimPass