; LLVM IR from bartobri/data-structures-c :: symbol-table/array-key-index-first-class (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.symbol_table = type { ptr, i32, i32 }

; Function Attrs: nounwind uwtable
define dso_local ptr @STinit(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  %5 = call noalias ptr @malloc(i64 noundef 16) #4
  store ptr %5, ptr %4, align 8, !tbaa !9
  %6 = load ptr, ptr %4, align 8, !tbaa !9
  %7 = getelementptr inbounds %struct.symbol_table, ptr %6, i32 0, i32 1
  store i32 0, ptr %7, align 8, !tbaa !11
  %8 = load i32, ptr %2, align 4, !tbaa !5
  %9 = load ptr, ptr %4, align 8, !tbaa !9
  %10 = getelementptr inbounds %struct.symbol_table, ptr %9, i32 0, i32 2
  store i32 %8, ptr %10, align 4, !tbaa !13
  %11 = load i32, ptr %2, align 4, !tbaa !5
  %12 = sext i32 %11 to i64
  %13 = mul i64 %12, 8
  %14 = call noalias ptr @malloc(i64 noundef %13) #4
  %15 = load ptr, ptr %4, align 8, !tbaa !9
  %16 = getelementptr inbounds %struct.symbol_table, ptr %15, i32 0, i32 0
  store ptr %14, ptr %16, align 8, !tbaa !14
  store i32 0, ptr %3, align 4, !tbaa !5
  br label %17

17:                                               ; preds = %28, %1
  %18 = load i32, ptr %3, align 4, !tbaa !5
  %19 = load i32, ptr %2, align 4, !tbaa !5
  %20 = icmp sle i32 %18, %19
  br i1 %20, label %21, label %31

21:                                               ; preds = %17
  %22 = load ptr, ptr %4, align 8, !tbaa !9
  %23 = getelementptr inbounds %struct.symbol_table, ptr %22, i32 0, i32 0
  %24 = load ptr, ptr %23, align 8, !tbaa !14
  %25 = load i32, ptr %3, align 4, !tbaa !5
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds ptr, ptr %24, i64 %26
  store ptr null, ptr %27, align 8, !tbaa !9
  br label %28

28:                                               ; preds = %21
  %29 = load i32, ptr %3, align 4, !tbaa !5
  %30 = add nsw i32 %29, 1
  store i32 %30, ptr %3, align 4, !tbaa !5
  br label %17, !llvm.loop !15

31:                                               ; preds = %17
  %32 = load ptr, ptr %4, align 8, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  ret ptr %32
}

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

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #2

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

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 allocsize(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 }
attributes #4 = { nounwind allocsize(0) }

!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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !6, i64 8}
!12 = !{!"symbol_table", !10, i64 0, !6, i64 8, !6, i64 12}
!13 = !{!12, !6, i64 12}
!14 = !{!12, !10, i64 0}
!15 = distinct !{!15, !16}
!16 = !{!"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: mustprogress nofree nounwind willreturn memory(write, argmem: none, inaccessiblemem: readwrite) uwtable
define dso_local noalias noundef ptr @STinit(i32 noundef %0) local_unnamed_addr #0 {
  %2 = tail call noalias dereferenceable_or_null(16) ptr @malloc(i64 noundef 16) #3
  %3 = getelementptr inbounds i8, ptr %2, i64 8
  store i32 0, ptr %3, align 8, !tbaa !5
  %4 = getelementptr inbounds i8, ptr %2, i64 12
  store i32 %0, ptr %4, align 4, !tbaa !11
  %5 = sext i32 %0 to i64
  %6 = shl nsw i64 %5, 3
  %7 = tail call noalias ptr @malloc(i64 noundef %6) #3
  store ptr %7, ptr %2, align 8, !tbaa !12
  %.not10 = icmp slt i32 %0, 0
  br i1 %.not10, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %1
  %8 = add nuw i32 %0, 1
  %9 = zext i32 %8 to i64
  %10 = shl nuw nsw i64 %9, 3
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 8 dereferenceable(1) %7, i8 0, i64 %10, i1 false), !tbaa !13
  br label %._crit_edge

._crit_edge:                                      ; preds = %.lr.ph.preheader, %1
  ret ptr %2
}

; Function Attrs: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #1

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #2

attributes #0 = { mustprogress nofree nounwind willreturn memory(write, argmem: none, inaccessiblemem: readwrite) 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 nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(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 nounwind willreturn memory(argmem: write) }
attributes #3 = { nounwind allocsize(0) }

!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 = !{!"symbol_table", !7, i64 0, !10, i64 8, !10, i64 12}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = !{!6, !10, i64 12}
!12 = !{!6, !7, i64 0}
!13 = !{!7, !7, i64 0}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LoopIdiomRecognizePass,LoopRotatePass,LoopSimplifyPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass