; 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
declare void @free(ptr noundef) #1

; Function Attrs: nounwind uwtable
define dso_local void @destroy_map(ptr noundef %0) #2 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  %6 = load ptr, ptr %2, align 8, !tbaa !5
  %7 = icmp ne ptr %6, null
  br i1 %7, label %9, label %8

8:                                                ; preds = %1
  br label %49

9:                                                ; preds = %1
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  store i32 0, ptr %3, align 4, !tbaa !9
  br label %10

10:                                               ; preds = %41, %9
  %11 = load i32, ptr %3, align 4, !tbaa !9
  %12 = load ptr, ptr %2, align 8, !tbaa !5
  %13 = getelementptr inbounds %struct.hash_map, ptr %12, i32 0, i32 1
  %14 = load i32, ptr %13, align 8, !tbaa !11
  %15 = icmp sle i32 %11, %14
  br i1 %15, label %17, label %16

16:                                               ; preds = %10
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  br label %44

17:                                               ; preds = %10
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  %18 = load ptr, ptr %2, align 8, !tbaa !5
  %19 = getelementptr inbounds %struct.hash_map, ptr %18, i32 0, i32 0
  %20 = load ptr, ptr %19, align 8, !tbaa !13
  %21 = load i32, ptr %3, align 4, !tbaa !9
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds ptr, ptr %20, i64 %22
  %24 = load ptr, ptr %23, align 8, !tbaa !5
  store ptr %24, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #3
  store ptr null, ptr %5, align 8, !tbaa !5
  br label %25

25:                                               ; preds = %28, %17
  %26 = load ptr, ptr %4, align 8, !tbaa !5
  %27 = icmp ne ptr %26, null
  br i1 %27, label %28, label %34

28:                                               ; preds = %25
  %29 = load ptr, ptr %4, align 8, !tbaa !5
  %30 = getelementptr inbounds %struct.hash_node, ptr %29, i32 0, i32 2
  %31 = load ptr, ptr %30, align 8, !tbaa !14
  store ptr %31, ptr %5, align 8, !tbaa !5
  %32 = load ptr, ptr %4, align 8, !tbaa !5
  call void @free(ptr noundef %32) #3
  %33 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %33, ptr %4, align 8, !tbaa !5
  br label %25, !llvm.loop !16

34:                                               ; preds = %25
  %35 = load ptr, ptr %2, align 8, !tbaa !5
  %36 = getelementptr inbounds %struct.hash_map, ptr %35, i32 0, i32 0
  %37 = load ptr, ptr %36, align 8, !tbaa !13
  %38 = load i32, ptr %3, align 4, !tbaa !9
  %39 = sext i32 %38 to i64
  %40 = getelementptr inbounds ptr, ptr %37, i64 %39
  store ptr null, ptr %40, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  br label %41

41:                                               ; preds = %34
  %42 = load i32, ptr %3, align 4, !tbaa !9
  %43 = add nsw i32 %42, 1
  store i32 %43, ptr %3, align 4, !tbaa !9
  br label %10, !llvm.loop !18

44:                                               ; preds = %16
  %45 = load ptr, ptr %2, align 8, !tbaa !5
  %46 = getelementptr inbounds %struct.hash_map, ptr %45, i32 0, i32 0
  %47 = load ptr, ptr %46, align 8, !tbaa !13
  call void @free(ptr noundef %47) #3
  %48 = load ptr, ptr %2, align 8, !tbaa !5
  call void @free(ptr noundef %48) #3
  store ptr null, ptr %2, align 8, !tbaa !5
  br label %49

49:                                               ; preds = %44, %8
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #2 = { 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 #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, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !10, i64 8}
!12 = !{!"hash_map", !6, i64 0, !10, i64 8}
!13 = !{!12, !6, i64 0}
!14 = !{!15, !6, i64 16}
!15 = !{!"hash_node", !6, i64 0, !6, i64 8, !6, i64 16}
!16 = distinct !{!16, !17}
!17 = !{!"llvm.loop.mustprogress"}
!18 = distinct !{!18, !17}


; 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 nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite)
declare void @free(ptr allocptr nocapture noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @destroy_map(ptr noundef %0) local_unnamed_addr #1 {
  %.not = icmp eq ptr %0, null
  br i1 %.not, label %15, label %.preheader

.preheader:                                       ; preds = %1
  %2 = getelementptr inbounds i8, ptr %0, i64 8
  %3 = load i32, ptr %2, align 8, !tbaa !5
  %.not1519 = icmp slt i32 %3, 0
  br i1 %.not1519, label %._crit_edge22, label %.lr.ph21

._crit_edge22:                                    ; preds = %._crit_edge, %.preheader
  %4 = load ptr, ptr %0, align 8, !tbaa !11
  tail call void @free(ptr noundef %4) #2
  tail call void @free(ptr noundef nonnull %0) #2
  br label %15

.lr.ph21:                                         ; preds = %.preheader, %._crit_edge
  %5 = phi i32 [ %11, %._crit_edge ], [ %3, %.preheader ]
  %indvars.iv = phi i64 [ %indvars.iv.next, %._crit_edge ], [ 0, %.preheader ]
  %6 = load ptr, ptr %0, align 8, !tbaa !11
  %7 = getelementptr inbounds ptr, ptr %6, i64 %indvars.iv
  %8 = load ptr, ptr %7, align 8, !tbaa !12
  %.not1617 = icmp eq ptr %8, null
  br i1 %.not1617, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph21, %.lr.ph
  %.018 = phi ptr [ %10, %.lr.ph ], [ %8, %.lr.ph21 ]
  %9 = getelementptr inbounds i8, ptr %.018, i64 16
  %10 = load ptr, ptr %9, align 8, !tbaa !13
  tail call void @free(ptr noundef nonnull %.018) #2
  %.not16 = icmp eq ptr %10, null
  br i1 %.not16, label %._crit_edge.loopexit, label %.lr.ph, !llvm.loop !15

._crit_edge.loopexit:                             ; preds = %.lr.ph
  %.pre = load ptr, ptr %0, align 8, !tbaa !11
  %.pre24 = load i32, ptr %2, align 8, !tbaa !5
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %.lr.ph21
  %11 = phi i32 [ %.pre24, %._crit_edge.loopexit ], [ %5, %.lr.ph21 ]
  %12 = phi ptr [ %.pre, %._crit_edge.loopexit ], [ %6, %.lr.ph21 ]
  %13 = getelementptr inbounds ptr, ptr %12, i64 %indvars.iv
  store ptr null, ptr %13, align 8, !tbaa !12
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %14 = sext i32 %11 to i64
  %.not15.not = icmp slt i64 %indvars.iv, %14
  br i1 %.not15.not, label %.lr.ph21, label %._crit_edge22, !llvm.loop !17

15:                                               ; preds = %1, %._crit_edge22
  ret void
}

attributes #0 = { 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 #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, !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 16}
!14 = !{!"hash_node", !7, i64 0, !7, i64 8, !7, i64 16}
!15 = distinct !{!15, !16}
!16 = !{!"llvm.loop.mustprogress"}
!17 = distinct !{!17, !16}


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