; LLVM IR from bartobri/data-structures-c :: symbol-table/patricia-trie (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.STnode = type { ptr, ptr, ptr, i32 }
%struct.anon = type { i32, i32 }

@head = external hidden global ptr, align 8

; 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 ptr @STsearchR(ptr noundef, i32 noundef, i32 noundef) #1

; Function Attrs: nounwind uwtable
define dso_local ptr @STsearch(i32 noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  %6 = load ptr, ptr @head, align 8, !tbaa !9
  %7 = getelementptr inbounds %struct.STnode, ptr %6, i32 0, i32 1
  %8 = load ptr, ptr %7, align 8, !tbaa !11
  %9 = load i32, ptr %3, align 4, !tbaa !5
  %10 = call ptr @STsearchR(ptr noundef %8, i32 noundef %9, i32 noundef -1)
  store ptr %10, ptr %4, align 8, !tbaa !9
  %11 = load ptr, ptr %4, align 8, !tbaa !9
  %12 = icmp eq ptr %11, null
  br i1 %12, label %19, label %13

13:                                               ; preds = %1
  %14 = load i32, ptr %3, align 4, !tbaa !5
  %15 = load ptr, ptr %4, align 8, !tbaa !9
  %16 = getelementptr inbounds %struct.anon, ptr %15, i32 0, i32 0
  %17 = load i32, ptr %16, align 4, !tbaa !13
  %18 = icmp eq i32 %14, %17
  br i1 %18, label %19, label %21

19:                                               ; preds = %13, %1
  %20 = load ptr, ptr %4, align 8, !tbaa !9
  store ptr %20, ptr %2, align 8
  store i32 1, ptr %5, align 4
  br label %22

21:                                               ; preds = %13
  store ptr null, ptr %2, align 8
  store i32 1, ptr %5, align 4
  br label %22

22:                                               ; preds = %21, %19
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  %23 = load ptr, ptr %2, align 8
  ret ptr %23
}

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 }

!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, !10, i64 8}
!12 = !{!"STnode", !10, i64 0, !10, i64 8, !10, i64 16, !6, i64 24}
!13 = !{!14, !6, i64 0}
!14 = !{!"", !6, i64 0, !6, i64 4}


; 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"

@head = external hidden local_unnamed_addr global ptr, align 8

; Function Attrs: nounwind uwtable
declare dso_local ptr @STsearchR(ptr noundef, i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local ptr @STsearch(i32 noundef %0) local_unnamed_addr #0 {
  %2 = load ptr, ptr @head, align 8, !tbaa !5
  %3 = getelementptr inbounds i8, ptr %2, i64 8
  %4 = load ptr, ptr %3, align 8, !tbaa !9
  %5 = tail call ptr @STsearchR(ptr noundef %4, i32 noundef %0, i32 noundef -1)
  %6 = icmp eq ptr %5, null
  br i1 %6, label %10, label %7

7:                                                ; preds = %1
  %8 = load i32, ptr %5, align 4, !tbaa !12
  %9 = icmp eq i32 %8, %0
  %spec.select = select i1 %9, ptr %5, ptr null
  br label %10

10:                                               ; preds = %7, %1
  %.0 = phi ptr [ null, %1 ], [ %spec.select, %7 ]
  ret ptr %.0
}

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, !6, i64 8}
!10 = !{!"STnode", !6, i64 0, !6, i64 8, !6, i64 16, !11, i64 24}
!11 = !{!"int", !7, i64 0}
!12 = !{!13, !11, i64 0}
!13 = !{!"", !11, i64 0, !11, i64 4}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,SROAPass,SimplifyCFGPass,TailCallElimPass