; LLVM IR from bartobri/data-structures-c :: linked-lists/bubble-sort (list)

; 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
declare dso_local void @list_compexch(ptr noundef, ptr noundef) #1

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

6:                                                ; preds = %45, %1
  %7 = load ptr, ptr %2, align 8, !tbaa !5
  %8 = getelementptr inbounds %struct.node, ptr %7, i32 0, i32 1
  %9 = load ptr, ptr %8, align 8, !tbaa !9
  %10 = icmp ne ptr %9, null
  br i1 %10, label %11, label %46

11:                                               ; preds = %6
  %12 = load ptr, ptr %2, align 8, !tbaa !5
  store ptr %12, ptr %3, align 8, !tbaa !5
  br label %13

13:                                               ; preds = %41, %11
  %14 = load ptr, ptr %3, align 8, !tbaa !5
  %15 = getelementptr inbounds %struct.node, ptr %14, i32 0, i32 1
  %16 = load ptr, ptr %15, align 8, !tbaa !9
  %17 = icmp ne ptr %16, null
  br i1 %17, label %18, label %45

18:                                               ; preds = %13
  %19 = load ptr, ptr %3, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.node, ptr %19, i32 0, i32 1
  %21 = load ptr, ptr %20, align 8, !tbaa !9
  %22 = getelementptr inbounds %struct.node, ptr %21, i32 0, i32 1
  %23 = load ptr, ptr %22, align 8, !tbaa !9
  %24 = icmp eq ptr %23, null
  br i1 %24, label %25, label %35

25:                                               ; preds = %18
  %26 = load ptr, ptr %3, align 8, !tbaa !5
  %27 = getelementptr inbounds %struct.node, ptr %26, i32 0, i32 1
  %28 = load ptr, ptr %27, align 8, !tbaa !9
  store ptr %28, ptr %4, align 8, !tbaa !5
  %29 = load ptr, ptr %3, align 8, !tbaa !5
  %30 = getelementptr inbounds %struct.node, ptr %29, i32 0, i32 1
  store ptr null, ptr %30, align 8, !tbaa !9
  %31 = load ptr, ptr %5, align 8, !tbaa !5
  %32 = load ptr, ptr %4, align 8, !tbaa !5
  %33 = getelementptr inbounds %struct.node, ptr %32, i32 0, i32 1
  store ptr %31, ptr %33, align 8, !tbaa !9
  %34 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %34, ptr %5, align 8, !tbaa !5
  br label %45

35:                                               ; preds = %18
  %36 = load ptr, ptr %3, align 8, !tbaa !5
  %37 = load ptr, ptr %3, align 8, !tbaa !5
  %38 = getelementptr inbounds %struct.node, ptr %37, i32 0, i32 1
  %39 = load ptr, ptr %38, align 8, !tbaa !9
  call void @list_compexch(ptr noundef %36, ptr noundef %39)
  br label %40

40:                                               ; preds = %35
  br label %41

41:                                               ; preds = %40
  %42 = load ptr, ptr %3, align 8, !tbaa !5
  %43 = getelementptr inbounds %struct.node, ptr %42, i32 0, i32 1
  %44 = load ptr, ptr %43, align 8, !tbaa !9
  store ptr %44, ptr %3, align 8, !tbaa !5
  br label %13, !llvm.loop !12

45:                                               ; preds = %25, %13
  br label %6, !llvm.loop !14

46:                                               ; preds = %6
  %47 = load ptr, ptr %5, align 8, !tbaa !5
  %48 = load ptr, ptr %2, align 8, !tbaa !5
  %49 = getelementptr inbounds %struct.node, ptr %48, i32 0, i32 1
  store ptr %47, ptr %49, align 8, !tbaa !9
  %50 = load ptr, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  ret ptr %50
}

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 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}
!14 = distinct !{!14, !13}


; 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: nounwind uwtable
declare dso_local void @list_compexch(ptr noundef, ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local noundef ptr @list_sort(ptr noundef returned %0) local_unnamed_addr #0 {
  %2 = getelementptr inbounds i8, ptr %0, i64 8
  %3 = load ptr, ptr %2, align 8, !tbaa !5
  %.not25 = icmp eq ptr %3, null
  br i1 %.not25, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %1, %.loopexit
  %4 = phi ptr [ %16, %.loopexit ], [ %3, %1 ]
  %.026 = phi ptr [ %.1, %.loopexit ], [ null, %1 ]
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %12
  %5 = phi ptr [ %15, %12 ], [ %4, %.lr.ph.preheader ]
  %6 = phi ptr [ %14, %12 ], [ %2, %.lr.ph.preheader ]
  %.01524 = phi ptr [ %13, %12 ], [ %0, %.lr.ph.preheader ]
  %7 = getelementptr inbounds i8, ptr %5, i64 8
  %8 = load ptr, ptr %7, align 8, !tbaa !5
  %9 = icmp eq ptr %8, null
  br i1 %9, label %10, label %12

10:                                               ; preds = %.lr.ph
  %11 = getelementptr inbounds i8, ptr %5, i64 8
  store ptr null, ptr %6, align 8, !tbaa !5
  store ptr %.026, ptr %11, align 8, !tbaa !5
  br label %.loopexit

12:                                               ; preds = %.lr.ph
  tail call void @list_compexch(ptr noundef nonnull %.01524, ptr noundef nonnull %5)
  %13 = load ptr, ptr %6, align 8, !tbaa !5
  %14 = getelementptr inbounds i8, ptr %13, i64 8
  %15 = load ptr, ptr %14, align 8, !tbaa !5
  %.not17 = icmp eq ptr %15, null
  br i1 %.not17, label %.loopexit, label %.lr.ph, !llvm.loop !11

.loopexit:                                        ; preds = %12, %10
  %.1 = phi ptr [ %5, %10 ], [ %.026, %12 ]
  %16 = load ptr, ptr %2, align 8, !tbaa !5
  %.not = icmp eq ptr %16, null
  br i1 %.not, label %._crit_edge, label %.lr.ph.preheader, !llvm.loop !13

._crit_edge:                                      ; preds = %.loopexit, %1
  %.0.lcssa = phi ptr [ null, %1 ], [ %.1, %.loopexit ]
  store ptr %.0.lcssa, ptr %2, align 8, !tbaa !5
  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, !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 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12, !14}
!14 = !{!"llvm.loop.unswitch.partial.disable"}


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