; LLVM IR from bartobri/data-structures-c :: symbol-table/hash-table-linear-probing-dynamic (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"

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

; Function Attrs: nounwind uwtable
declare dso_local void @STinit(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
declare dso_local void @STinsert(ptr noundef) #0

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

; Function Attrs: nounwind uwtable
define dso_local void @STcontract() #0 {
  %1 = alloca i32, align 4
  %2 = alloca ptr, align 8
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %2) #3
  %3 = load ptr, ptr @st, align 8, !tbaa !5
  store ptr %3, ptr %2, align 8, !tbaa !5
  %4 = load i32, ptr @M, align 4, !tbaa !9
  %5 = sdiv i32 %4, 2
  call void @STinit(i32 noundef %5)
  store i32 0, ptr %1, align 4, !tbaa !9
  br label %6

6:                                                ; preds = %25, %0
  %7 = load i32, ptr %1, align 4, !tbaa !9
  %8 = load i32, ptr @M, align 4, !tbaa !9
  %9 = mul nsw i32 %8, 2
  %10 = icmp slt i32 %7, %9
  br i1 %10, label %11, label %28

11:                                               ; preds = %6
  %12 = load ptr, ptr %2, align 8, !tbaa !5
  %13 = load i32, ptr %1, align 4, !tbaa !9
  %14 = sext i32 %13 to i64
  %15 = getelementptr inbounds ptr, ptr %12, i64 %14
  %16 = load ptr, ptr %15, align 8, !tbaa !5
  %17 = icmp ne ptr %16, null
  br i1 %17, label %18, label %24

18:                                               ; preds = %11
  %19 = load ptr, ptr %2, align 8, !tbaa !5
  %20 = load i32, ptr %1, align 4, !tbaa !9
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds ptr, ptr %19, i64 %21
  %23 = load ptr, ptr %22, align 8, !tbaa !5
  call void @STinsert(ptr noundef %23)
  br label %24

24:                                               ; preds = %18, %11
  br label %25

25:                                               ; preds = %24
  %26 = load i32, ptr %1, align 4, !tbaa !9
  %27 = add nsw i32 %26, 1
  store i32 %27, ptr %1, align 4, !tbaa !9
  br label %6, !llvm.loop !11

28:                                               ; preds = %6
  %29 = load ptr, ptr %2, align 8, !tbaa !5
  call void @free(ptr noundef %29) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %2) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #3
  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" }
attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"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"

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

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

; Function Attrs: nounwind uwtable
declare dso_local void @STinsert(ptr noundef) local_unnamed_addr #0

; 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: nounwind uwtable
define dso_local void @STcontract() local_unnamed_addr #0 {
  %1 = load ptr, ptr @st, align 8, !tbaa !5
  %2 = load i32, ptr @M, align 4, !tbaa !9
  %3 = sdiv i32 %2, 2
  tail call void @STinit(i32 noundef %3)
  %4 = load i32, ptr @M, align 4, !tbaa !9
  %5 = icmp sgt i32 %4, 0
  br i1 %5, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %0, %10
  %6 = phi i32 [ %11, %10 ], [ %4, %0 ]
  %indvars.iv = phi i64 [ %indvars.iv.next, %10 ], [ 0, %0 ]
  %7 = getelementptr inbounds ptr, ptr %1, i64 %indvars.iv
  %8 = load ptr, ptr %7, align 8, !tbaa !5
  %.not = icmp eq ptr %8, null
  br i1 %.not, label %10, label %9

9:                                                ; preds = %.lr.ph
  tail call void @STinsert(ptr noundef nonnull %8)
  %.pre = load i32, ptr @M, align 4, !tbaa !9
  br label %10

10:                                               ; preds = %.lr.ph, %9
  %11 = phi i32 [ %6, %.lr.ph ], [ %.pre, %9 ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %12 = shl nsw i32 %11, 1
  %13 = sext i32 %12 to i64
  %14 = icmp slt i64 %indvars.iv.next, %13
  br i1 %14, label %.lr.ph, label %._crit_edge, !llvm.loop !11

._crit_edge:                                      ; preds = %10, %0
  tail call void @free(ptr noundef %1) #2
  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" }
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 = { 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 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


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