; LLVM IR from Ayon-SSP/The-SDE-Prep :: 1]_Data Structures/2]_Linked List (27_sortingLL)

; 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.Node = type { i32, ptr }

; 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
define dso_local void @sort(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  store ptr null, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  br label %5

5:                                                ; preds = %39, %1
  %6 = load ptr, ptr %2, align 8, !tbaa !5
  %7 = icmp ne ptr %6, null
  br i1 %7, label %8, label %43

8:                                                ; preds = %5
  %9 = load ptr, ptr %2, align 8, !tbaa !5
  %10 = getelementptr inbounds %struct.Node, ptr %9, i32 0, i32 1
  %11 = load ptr, ptr %10, align 8, !tbaa !9
  store ptr %11, ptr %3, align 8, !tbaa !5
  br label %12

12:                                               ; preds = %35, %8
  %13 = load ptr, ptr %3, align 8, !tbaa !5
  %14 = icmp ne ptr %13, null
  br i1 %14, label %15, label %39

15:                                               ; preds = %12
  %16 = load ptr, ptr %2, align 8, !tbaa !5
  %17 = getelementptr inbounds %struct.Node, ptr %16, i32 0, i32 0
  %18 = load i32, ptr %17, align 8, !tbaa !12
  %19 = load ptr, ptr %3, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.Node, ptr %19, i32 0, i32 0
  %21 = load i32, ptr %20, align 8, !tbaa !12
  %22 = icmp sgt i32 %18, %21
  br i1 %22, label %23, label %35

23:                                               ; preds = %15
  %24 = load ptr, ptr %2, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.Node, ptr %24, i32 0, i32 0
  %26 = load i32, ptr %25, align 8, !tbaa !12
  store i32 %26, ptr %4, align 4, !tbaa !13
  %27 = load ptr, ptr %3, align 8, !tbaa !5
  %28 = getelementptr inbounds %struct.Node, ptr %27, i32 0, i32 0
  %29 = load i32, ptr %28, align 8, !tbaa !12
  %30 = load ptr, ptr %2, align 8, !tbaa !5
  %31 = getelementptr inbounds %struct.Node, ptr %30, i32 0, i32 0
  store i32 %29, ptr %31, align 8, !tbaa !12
  %32 = load i32, ptr %4, align 4, !tbaa !13
  %33 = load ptr, ptr %3, align 8, !tbaa !5
  %34 = getelementptr inbounds %struct.Node, ptr %33, i32 0, i32 0
  store i32 %32, ptr %34, align 8, !tbaa !12
  br label %35

35:                                               ; preds = %23, %15
  %36 = load ptr, ptr %3, align 8, !tbaa !5
  %37 = getelementptr inbounds %struct.Node, ptr %36, i32 0, i32 1
  %38 = load ptr, ptr %37, align 8, !tbaa !9
  store ptr %38, ptr %3, align 8, !tbaa !5
  br label %12, !llvm.loop !14

39:                                               ; preds = %12
  %40 = load ptr, ptr %2, align 8, !tbaa !5
  %41 = getelementptr inbounds %struct.Node, ptr %40, i32 0, i32 1
  %42 = load ptr, ptr %41, align 8, !tbaa !9
  store ptr %42, ptr %2, align 8, !tbaa !5
  br label %5, !llvm.loop !16

43:                                               ; preds = %5
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  ret void
}

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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !6, i64 8}
!10 = !{!"Node", !11, i64 0, !6, i64 8}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !11, i64 0}
!13 = !{!11, !11, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}
!16 = distinct !{!16, !15}


; 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 norecurse nosync nounwind memory(readwrite, inaccessiblemem: none) uwtable
define dso_local void @sort(ptr noundef %0) local_unnamed_addr #0 {
  %.not18 = icmp eq ptr %0, null
  br i1 %.not18, label %._crit_edge22, label %.lr.ph21

.lr.ph21:                                         ; preds = %1, %._crit_edge
  %.019 = phi ptr [ %.01115, %._crit_edge ], [ %0, %1 ]
  %2 = getelementptr inbounds i8, ptr %.019, i64 8
  %.01115 = load ptr, ptr %2, align 8, !tbaa !5
  %.not1416 = icmp eq ptr %.01115, null
  br i1 %.not1416, label %._crit_edge22, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph21, %7
  %.01117 = phi ptr [ %.011, %7 ], [ %.01115, %.lr.ph21 ]
  %3 = load i32, ptr %.019, align 8, !tbaa !11
  %4 = load i32, ptr %.01117, align 8, !tbaa !11
  %5 = icmp sgt i32 %3, %4
  br i1 %5, label %6, label %7

6:                                                ; preds = %.lr.ph
  store i32 %4, ptr %.019, align 8, !tbaa !11
  store i32 %3, ptr %.01117, align 8, !tbaa !11
  br label %7

7:                                                ; preds = %6, %.lr.ph
  %8 = getelementptr inbounds i8, ptr %.01117, i64 8
  %.011 = load ptr, ptr %8, align 8, !tbaa !5
  %.not14 = icmp eq ptr %.011, null
  br i1 %.not14, label %._crit_edge, label %.lr.ph, !llvm.loop !12

._crit_edge:                                      ; preds = %7
  br i1 %.not1416, label %._crit_edge22, label %.lr.ph21, !llvm.loop !14

._crit_edge22:                                    ; preds = %.lr.ph21, %._crit_edge, %1
  ret void
}

attributes #0 = { nofree norecurse nosync nounwind memory(readwrite, inaccessiblemem: none) 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, !10, i64 8}
!6 = !{!"Node", !7, i64 0, !10, i64 8}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!6, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}
!14 = distinct !{!14, !13}


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