; LLVM IR from bartobri/data-structures-c :: symbol-table/array-key-index (st)

; 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.anon = type { i32, i32 }

@st = external hidden global ptr, align 8
@N = external hidden global i32, align 4

; Function Attrs: nounwind uwtable
define dso_local void @STdelete(ptr noundef %0) #0 {
  %2 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  %3 = load ptr, ptr @st, align 8, !tbaa !5
  %4 = load ptr, ptr %2, align 8, !tbaa !5
  %5 = getelementptr inbounds %struct.anon, ptr %4, i32 0, i32 0
  %6 = load i32, ptr %5, align 4, !tbaa !9
  %7 = sext i32 %6 to i64
  %8 = getelementptr inbounds ptr, ptr %3, i64 %7
  %9 = load ptr, ptr %8, align 8, !tbaa !5
  %10 = icmp ne ptr %9, null
  br i1 %10, label %11, label %14

11:                                               ; preds = %1
  %12 = load i32, ptr @N, align 4, !tbaa !12
  %13 = add nsw i32 %12, -1
  store i32 %13, ptr @N, align 4, !tbaa !12
  br label %14

14:                                               ; preds = %11, %1
  %15 = load ptr, ptr @st, align 8, !tbaa !5
  %16 = load ptr, ptr %2, align 8, !tbaa !5
  %17 = getelementptr inbounds %struct.anon, ptr %16, i32 0, i32 0
  %18 = load i32, ptr %17, align 4, !tbaa !9
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds ptr, ptr %15, i64 %19
  store ptr null, ptr %20, align 8, !tbaa !5
  ret void
}

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, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !11, i64 0}
!10 = !{!"", !11, i64 0, !11, i64 4}
!11 = !{!"int", !7, i64 0}
!12 = !{!11, !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"

@st = external hidden local_unnamed_addr global ptr, align 8
@N = external hidden local_unnamed_addr global i32, align 4

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(readwrite, inaccessiblemem: none) uwtable
define dso_local void @STdelete(ptr nocapture noundef readonly %0) local_unnamed_addr #0 {
  %2 = load ptr, ptr @st, align 8, !tbaa !5
  %3 = load i32, ptr %0, align 4, !tbaa !9
  %4 = sext i32 %3 to i64
  %5 = getelementptr inbounds ptr, ptr %2, i64 %4
  %6 = load ptr, ptr %5, align 8, !tbaa !5
  %.not = icmp eq ptr %6, null
  br i1 %.not, label %10, label %7

7:                                                ; preds = %1
  %8 = load i32, ptr @N, align 4, !tbaa !12
  %9 = add nsw i32 %8, -1
  store i32 %9, ptr @N, align 4, !tbaa !12
  %.pre = load i32, ptr %0, align 4, !tbaa !9
  %.pre2 = sext i32 %.pre to i64
  br label %10

10:                                               ; preds = %7, %1
  %.pre-phi = phi i64 [ %.pre2, %7 ], [ %4, %1 ]
  %11 = getelementptr inbounds ptr, ptr %2, i64 %.pre-phi
  store ptr null, ptr %11, align 8, !tbaa !5
  ret void
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(readwrite, inaccessiblemem: none) 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, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !11, i64 0}
!10 = !{!"", !11, i64 0, !11, i64 4}
!11 = !{!"int", !7, i64 0}
!12 = !{!11, !11, i64 0}


; Effective O3 passes: BDCEPass,EarlyCSEPass,GVNPass,GlobalOptPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass