; LLVM IR from hutusi/rethink-c :: src (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._List = type { ptr, ptr, i32 }
%struct._ListNode = type { ptr, ptr, 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 ptr @list_find_node(ptr noundef %0, ptr noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  %8 = load ptr, ptr %4, align 8, !tbaa !5
  %9 = icmp eq ptr %8, null
  br i1 %9, label %13, label %10

10:                                               ; preds = %2
  %11 = load ptr, ptr %5, align 8, !tbaa !5
  %12 = icmp eq ptr %11, null
  br i1 %12, label %13, label %14

13:                                               ; preds = %10, %2
  store ptr null, ptr %3, align 8
  br label %34

14:                                               ; preds = %10
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %15 = load ptr, ptr %4, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct._List, ptr %15, i32 0, i32 0
  %17 = load ptr, ptr %16, align 8, !tbaa !9
  store ptr %17, ptr %6, align 8, !tbaa !5
  br label %18

18:                                               ; preds = %28, %14
  %19 = load ptr, ptr %6, align 8, !tbaa !5
  %20 = icmp ne ptr %19, null
  br i1 %20, label %21, label %32

21:                                               ; preds = %18
  %22 = load ptr, ptr %5, align 8, !tbaa !5
  %23 = load ptr, ptr %6, align 8, !tbaa !5
  %24 = icmp eq ptr %22, %23
  br i1 %24, label %25, label %27

25:                                               ; preds = %21
  %26 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %26, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %33

27:                                               ; preds = %21
  br label %28

28:                                               ; preds = %27
  %29 = load ptr, ptr %6, align 8, !tbaa !5
  %30 = getelementptr inbounds %struct._ListNode, ptr %29, i32 0, i32 2
  %31 = load ptr, ptr %30, align 8, !tbaa !12
  store ptr %31, ptr %6, align 8, !tbaa !5
  br label %18, !llvm.loop !14

32:                                               ; preds = %18
  store ptr null, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %33

33:                                               ; preds = %32, %25
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  br label %34

34:                                               ; preds = %33, %13
  %35 = load ptr, ptr %3, align 8
  ret ptr %35
}

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 0}
!10 = !{!"_List", !6, i64 0, !6, i64 8, !11, i64 16}
!11 = !{!"int", !7, i64 0}
!12 = !{!13, !6, i64 16}
!13 = !{!"_ListNode", !6, i64 0, !6, i64 8, !6, i64 16}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}


; 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(read, inaccessiblemem: none) uwtable
define dso_local noundef ptr @list_find_node(ptr noundef readonly %0, ptr noundef readnone %1) local_unnamed_addr #0 {
  %3 = icmp eq ptr %0, null
  %4 = icmp eq ptr %1, null
  %or.cond = or i1 %3, %4
  br i1 %or.cond, label %.loopexit, label %.preheader

.preheader:                                       ; preds = %2
  %.013 = load ptr, ptr %0, align 8, !tbaa !5
  %.not14 = icmp eq ptr %.013, null
  br i1 %.not14, label %.loopexit, label %.lr.ph

5:                                                ; preds = %.lr.ph
  %6 = getelementptr inbounds i8, ptr %.015, i64 16
  %.0 = load ptr, ptr %6, align 8, !tbaa !5
  %.not = icmp eq ptr %.0, null
  br i1 %.not, label %.loopexit, label %.lr.ph, !llvm.loop !9

.lr.ph:                                           ; preds = %.preheader, %5
  %.015 = phi ptr [ %.0, %5 ], [ %.013, %.preheader ]
  %7 = icmp eq ptr %.015, %1
  br i1 %7, label %.loopexit, label %5

.loopexit:                                        ; preds = %5, %.lr.ph, %.preheader, %2
  %.1 = phi ptr [ null, %2 ], [ null, %.preheader ], [ null, %5 ], [ %1, %.lr.ph ]
  ret ptr %.1
}

attributes #0 = { nofree norecurse nosync nounwind memory(read, 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, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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