; 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 }

@head = external hidden global ptr, align 8

; Function Attrs: nounwind uwtable
define dso_local void @STsortR(ptr noundef %0, ptr noundef %1, i32 noundef %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store i32 %2, ptr %6, align 4, !tbaa !9
  %7 = load ptr, ptr %4, align 8, !tbaa !5
  %8 = getelementptr inbounds %struct.STnode, ptr %7, i32 0, i32 3
  %9 = load i32, ptr %8, align 8, !tbaa !11
  %10 = load i32, ptr %6, align 4, !tbaa !9
  %11 = icmp sle i32 %9, %10
  br i1 %11, label %12, label %22

12:                                               ; preds = %3
  %13 = load ptr, ptr %4, align 8, !tbaa !5
  %14 = load ptr, ptr @head, align 8, !tbaa !5
  %15 = icmp ne ptr %13, %14
  br i1 %15, label %16, label %21

16:                                               ; preds = %12
  %17 = load ptr, ptr %5, align 8, !tbaa !5
  %18 = load ptr, ptr %4, align 8, !tbaa !5
  %19 = getelementptr inbounds %struct.STnode, ptr %18, i32 0, i32 0
  %20 = load ptr, ptr %19, align 8, !tbaa !13
  call void %17(ptr noundef %20)
  br label %21

21:                                               ; preds = %16, %12
  br label %37

22:                                               ; preds = %3
  %23 = load ptr, ptr %4, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct.STnode, ptr %23, i32 0, i32 1
  %25 = load ptr, ptr %24, align 8, !tbaa !14
  %26 = load ptr, ptr %5, align 8, !tbaa !5
  %27 = load ptr, ptr %4, align 8, !tbaa !5
  %28 = getelementptr inbounds %struct.STnode, ptr %27, i32 0, i32 3
  %29 = load i32, ptr %28, align 8, !tbaa !11
  call void @STsortR(ptr noundef %25, ptr noundef %26, i32 noundef %29)
  %30 = load ptr, ptr %4, align 8, !tbaa !5
  %31 = getelementptr inbounds %struct.STnode, ptr %30, i32 0, i32 2
  %32 = load ptr, ptr %31, align 8, !tbaa !15
  %33 = load ptr, ptr %5, align 8, !tbaa !5
  %34 = load ptr, ptr %4, align 8, !tbaa !5
  %35 = getelementptr inbounds %struct.STnode, ptr %34, i32 0, i32 3
  %36 = load i32, ptr %35, align 8, !tbaa !11
  call void @STsortR(ptr noundef %32, ptr noundef %33, i32 noundef %36)
  br label %37

37:                                               ; preds = %22, %21
  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, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !10, i64 24}
!12 = !{!"STnode", !6, i64 0, !6, i64 8, !6, i64 16, !10, i64 24}
!13 = !{!12, !6, i64 0}
!14 = !{!12, !6, i64 8}
!15 = !{!12, !6, i64 16}


; 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
define dso_local void @STsortR(ptr noundef readonly %0, ptr nocapture noundef readonly %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = getelementptr inbounds i8, ptr %0, i64 24
  %5 = load i32, ptr %4, align 8, !tbaa !5
  %.not14 = icmp sgt i32 %5, %2
  br i1 %.not14, label %tailrecurse, label %tailrecurse._crit_edge

tailrecurse._crit_edge:                           ; preds = %tailrecurse, %3
  %.tr.lcssa = phi ptr [ %0, %3 ], [ %14, %tailrecurse ]
  %6 = load ptr, ptr @head, align 8, !tbaa !11
  %.not11 = icmp eq ptr %6, %.tr.lcssa
  br i1 %.not11, label %18, label %7

7:                                                ; preds = %tailrecurse._crit_edge
  %8 = load ptr, ptr %.tr.lcssa, align 8, !tbaa !12
  tail call void %1(ptr noundef %8) #1
  br label %18

tailrecurse:                                      ; preds = %3, %tailrecurse
  %9 = phi i32 [ %17, %tailrecurse ], [ %5, %3 ]
  %10 = phi ptr [ %16, %tailrecurse ], [ %4, %3 ]
  %.tr15 = phi ptr [ %14, %tailrecurse ], [ %0, %3 ]
  %11 = getelementptr inbounds i8, ptr %.tr15, i64 8
  %12 = load ptr, ptr %11, align 8, !tbaa !13
  tail call void @STsortR(ptr noundef %12, ptr noundef %1, i32 noundef %9)
  %13 = getelementptr inbounds i8, ptr %.tr15, i64 16
  %14 = load ptr, ptr %13, align 8, !tbaa !14
  %15 = load i32, ptr %10, align 8, !tbaa !5
  %16 = getelementptr inbounds i8, ptr %14, i64 24
  %17 = load i32, ptr %16, align 8, !tbaa !5
  %.not = icmp sgt i32 %17, %15
  br i1 %.not, label %tailrecurse, label %tailrecurse._crit_edge

18:                                               ; preds = %tailrecurse._crit_edge, %7
  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 = { 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 24}
!6 = !{!"STnode", !7, i64 0, !7, i64 8, !7, i64 16, !10, i64 24}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = !{!7, !7, i64 0}
!12 = !{!6, !7, i64 0}
!13 = !{!6, !7, i64 8}
!14 = !{!6, !7, i64 16}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass