; LLVM IR from sbshah97/DS-Algo-Handbook :: Algorithms/Sort_Algorithms/Shell_Sort (sortTree)

; 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.btreenode = type { ptr, i32, ptr }

; Function Attrs: nounwind uwtable
define dso_local void @insert(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  %5 = load ptr, ptr %3, align 8, !tbaa !5
  %6 = load ptr, ptr %5, align 8, !tbaa !5
  %7 = icmp eq ptr %6, null
  br i1 %7, label %8, label %21

8:                                                ; preds = %2
  %9 = call noalias ptr @malloc(i64 noundef 24) #2
  %10 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %9, ptr %10, align 8, !tbaa !5
  %11 = load ptr, ptr %3, align 8, !tbaa !5
  %12 = load ptr, ptr %11, align 8, !tbaa !5
  %13 = getelementptr inbounds %struct.btreenode, ptr %12, i32 0, i32 0
  store ptr null, ptr %13, align 8, !tbaa !11
  %14 = load i32, ptr %4, align 4, !tbaa !9
  %15 = load ptr, ptr %3, align 8, !tbaa !5
  %16 = load ptr, ptr %15, align 8, !tbaa !5
  %17 = getelementptr inbounds %struct.btreenode, ptr %16, i32 0, i32 1
  store i32 %14, ptr %17, align 8, !tbaa !13
  %18 = load ptr, ptr %3, align 8, !tbaa !5
  %19 = load ptr, ptr %18, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.btreenode, ptr %19, i32 0, i32 2
  store ptr null, ptr %20, align 8, !tbaa !14
  br label %39

21:                                               ; preds = %2
  %22 = load i32, ptr %4, align 4, !tbaa !9
  %23 = load ptr, ptr %3, align 8, !tbaa !5
  %24 = load ptr, ptr %23, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.btreenode, ptr %24, i32 0, i32 1
  %26 = load i32, ptr %25, align 8, !tbaa !13
  %27 = icmp slt i32 %22, %26
  br i1 %27, label %28, label %33

28:                                               ; preds = %21
  %29 = load ptr, ptr %3, align 8, !tbaa !5
  %30 = load ptr, ptr %29, align 8, !tbaa !5
  %31 = getelementptr inbounds %struct.btreenode, ptr %30, i32 0, i32 0
  %32 = load i32, ptr %4, align 4, !tbaa !9
  call void @insert(ptr noundef %31, i32 noundef %32)
  br label %38

33:                                               ; preds = %21
  %34 = load ptr, ptr %3, align 8, !tbaa !5
  %35 = load ptr, ptr %34, align 8, !tbaa !5
  %36 = getelementptr inbounds %struct.btreenode, ptr %35, i32 0, i32 2
  %37 = load i32, ptr %4, align 4, !tbaa !9
  call void @insert(ptr noundef %36, i32 noundef %37)
  br label %38

38:                                               ; preds = %33, %28
  br label %39

39:                                               ; preds = %38, %8
  ret void
}

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #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 = { 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 #2 = { 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 = !{!"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, !6, i64 0}
!12 = !{!"btreenode", !6, i64 0, !10, i64 8, !6, i64 16}
!13 = !{!12, !10, i64 8}
!14 = !{!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"

; Function Attrs: nofree nounwind uwtable
define dso_local void @insert(ptr nocapture noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = load ptr, ptr %0, align 8, !tbaa !5
  %4 = icmp eq ptr %3, null
  br i1 %4, label %tailrecurse._crit_edge, label %tailrecurse

tailrecurse._crit_edge.loopexit:                  ; preds = %tailrecurse
  %spec.select.le = getelementptr inbounds i8, ptr %8, i64 %spec.select.idx
  br label %tailrecurse._crit_edge

tailrecurse._crit_edge:                           ; preds = %tailrecurse._crit_edge.loopexit, %2
  %.tr.lcssa = phi ptr [ %0, %2 ], [ %spec.select.le, %tailrecurse._crit_edge.loopexit ]
  %5 = tail call noalias dereferenceable_or_null(24) ptr @malloc(i64 noundef 24) #2
  store ptr %5, ptr %.tr.lcssa, align 8, !tbaa !5
  store ptr null, ptr %5, align 8, !tbaa !9
  %6 = getelementptr inbounds i8, ptr %5, i64 8
  store i32 %1, ptr %6, align 8, !tbaa !12
  %7 = getelementptr inbounds i8, ptr %5, i64 16
  store ptr null, ptr %7, align 8, !tbaa !13
  ret void

tailrecurse:                                      ; preds = %2, %tailrecurse
  %8 = phi ptr [ %12, %tailrecurse ], [ %3, %2 ]
  %9 = getelementptr inbounds i8, ptr %8, i64 8
  %10 = load i32, ptr %9, align 8, !tbaa !12
  %11 = icmp sgt i32 %10, %1
  %spec.select.idx = select i1 %11, i64 0, i64 16
  %spec.select = getelementptr inbounds i8, ptr %8, i64 %spec.select.idx
  %12 = load ptr, ptr %spec.select, align 8, !tbaa !5
  %13 = icmp eq ptr %12, null
  br i1 %13, label %tailrecurse._crit_edge.loopexit, label %tailrecurse
}

; 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

attributes #0 = { nofree 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 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 = { 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !6, i64 0}
!10 = !{!"btreenode", !6, i64 0, !11, i64 8, !6, i64 16}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !11, i64 8}
!13 = !{!10, !6, i64 16}


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