; 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_data(ptr noundef %0, ptr noundef %1, ptr noundef %2) #1 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  %8 = alloca ptr, align 8
  %9 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !5
  store ptr %2, ptr %7, align 8, !tbaa !5
  %10 = load ptr, ptr %5, align 8, !tbaa !5
  %11 = icmp eq ptr %10, null
  br i1 %11, label %12, label %13

12:                                               ; preds = %3
  store ptr null, ptr %4, align 8
  br label %37

13:                                               ; preds = %3
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  %14 = load ptr, ptr %5, align 8, !tbaa !5
  %15 = getelementptr inbounds %struct._List, ptr %14, i32 0, i32 0
  %16 = load ptr, ptr %15, align 8, !tbaa !9
  store ptr %16, ptr %8, align 8, !tbaa !5
  br label %17

17:                                               ; preds = %31, %13
  %18 = load ptr, ptr %8, align 8, !tbaa !5
  %19 = icmp ne ptr %18, null
  br i1 %19, label %20, label %35

20:                                               ; preds = %17
  %21 = load ptr, ptr %6, align 8, !tbaa !5
  %22 = load ptr, ptr %8, align 8, !tbaa !5
  %23 = getelementptr inbounds %struct._ListNode, ptr %22, i32 0, i32 0
  %24 = load ptr, ptr %23, align 8, !tbaa !12
  %25 = load ptr, ptr %7, align 8, !tbaa !5
  %26 = call i32 %21(ptr noundef %24, ptr noundef %25)
  %27 = icmp ne i32 %26, 0
  br i1 %27, label %28, label %30

28:                                               ; preds = %20
  %29 = load ptr, ptr %8, align 8, !tbaa !5
  store ptr %29, ptr %4, align 8
  store i32 1, ptr %9, align 4
  br label %36

30:                                               ; preds = %20
  br label %31

31:                                               ; preds = %30
  %32 = load ptr, ptr %8, align 8, !tbaa !5
  %33 = getelementptr inbounds %struct._ListNode, ptr %32, i32 0, i32 2
  %34 = load ptr, ptr %33, align 8, !tbaa !14
  store ptr %34, ptr %8, align 8, !tbaa !5
  br label %17, !llvm.loop !15

35:                                               ; preds = %17
  store ptr null, ptr %4, align 8
  store i32 1, ptr %9, align 4
  br label %36

36:                                               ; preds = %35, %28
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  br label %37

37:                                               ; preds = %36, %12
  %38 = load ptr, ptr %4, align 8
  ret ptr %38
}

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 0}
!13 = !{!"_ListNode", !6, i64 0, !6, i64 8, !6, i64 16}
!14 = !{!13, !6, i64 16}
!15 = distinct !{!15, !16}
!16 = !{!"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: nounwind uwtable
define dso_local noundef ptr @list_find_data(ptr noundef readonly %0, ptr nocapture noundef readonly %1, ptr noundef %2) local_unnamed_addr #0 {
  %4 = icmp eq ptr %0, null
  br i1 %4, label %.loopexit, label %.preheader

.preheader:                                       ; preds = %3
  %.012 = load ptr, ptr %0, align 8, !tbaa !5
  %.not13 = icmp eq ptr %.012, null
  br i1 %.not13, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %.preheader, %7
  %.014 = phi ptr [ %.0, %7 ], [ %.012, %.preheader ]
  %5 = load ptr, ptr %.014, align 8, !tbaa !9
  %6 = tail call i32 %1(ptr noundef %5, ptr noundef %2) #1
  %.not11 = icmp eq i32 %6, 0
  br i1 %.not11, label %7, label %.loopexit

7:                                                ; preds = %.lr.ph
  %8 = getelementptr inbounds i8, ptr %.014, i64 16
  %.0 = load ptr, ptr %8, align 8, !tbaa !5
  %.not = icmp eq ptr %.0, null
  br i1 %.not, label %.loopexit, label %.lr.ph, !llvm.loop !11

.loopexit:                                        ; preds = %7, %.lr.ph, %.preheader, %3
  %.1 = phi ptr [ null, %3 ], [ null, %.preheader ], [ null, %7 ], [ %.014, %.lr.ph ]
  ret ptr %.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 }

!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 = !{!"_ListNode", !6, i64 0, !6, i64 8, !6, i64 16}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


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