; LLVM IR from CactiLab/Sherloc-Cortex-M-CFVD :: Sherloc_runtime/evaluation/src/sglib_dllist (dllist)

; 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.dllist = type { i32, 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 i32 @sglib_dllist_len(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca ptr, align 8
  %8 = alloca ptr, align 8
  %9 = alloca ptr, align 8
  %10 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  %11 = load ptr, ptr %2, align 8, !tbaa !5
  %12 = icmp eq ptr %11, null
  br i1 %12, label %13, label %14

13:                                               ; preds = %1
  store i32 0, ptr %3, align 4, !tbaa !9
  br label %45

14:                                               ; preds = %1
  store i32 0, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  %15 = load ptr, ptr %2, align 8, !tbaa !5
  store ptr %15, ptr %8, align 8, !tbaa !5
  br label %16

16:                                               ; preds = %19, %14
  %17 = load ptr, ptr %8, align 8, !tbaa !5
  %18 = icmp ne ptr %17, null
  br i1 %18, label %19, label %26

19:                                               ; preds = %16
  %20 = load ptr, ptr %8, align 8, !tbaa !5
  %21 = getelementptr inbounds %struct.dllist, ptr %20, i32 0, i32 2
  %22 = load ptr, ptr %21, align 8, !tbaa !11
  store ptr %22, ptr %7, align 8, !tbaa !5
  %23 = load i32, ptr %5, align 4, !tbaa !9
  %24 = add nsw i32 %23, 1
  store i32 %24, ptr %5, align 4, !tbaa !9
  %25 = load ptr, ptr %7, align 8, !tbaa !5
  store ptr %25, ptr %8, align 8, !tbaa !5
  br label %16, !llvm.loop !13

26:                                               ; preds = %16
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  %27 = load ptr, ptr %2, align 8, !tbaa !5
  %28 = getelementptr inbounds %struct.dllist, ptr %27, i32 0, i32 1
  %29 = load ptr, ptr %28, align 8, !tbaa !15
  store ptr %29, ptr %4, align 8, !tbaa !5
  store i32 0, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %10) #2
  %30 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %30, ptr %10, align 8, !tbaa !5
  br label %31

31:                                               ; preds = %34, %26
  %32 = load ptr, ptr %10, align 8, !tbaa !5
  %33 = icmp ne ptr %32, null
  br i1 %33, label %34, label %41

34:                                               ; preds = %31
  %35 = load ptr, ptr %10, align 8, !tbaa !5
  %36 = getelementptr inbounds %struct.dllist, ptr %35, i32 0, i32 1
  %37 = load ptr, ptr %36, align 8, !tbaa !15
  store ptr %37, ptr %9, align 8, !tbaa !5
  %38 = load i32, ptr %6, align 4, !tbaa !9
  %39 = add nsw i32 %38, 1
  store i32 %39, ptr %6, align 4, !tbaa !9
  %40 = load ptr, ptr %9, align 8, !tbaa !5
  store ptr %40, ptr %10, align 8, !tbaa !5
  br label %31, !llvm.loop !16

41:                                               ; preds = %31
  call void @llvm.lifetime.end.p0(i64 8, ptr %10) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #2
  %42 = load i32, ptr %5, align 4, !tbaa !9
  %43 = load i32, ptr %6, align 4, !tbaa !9
  %44 = add nsw i32 %42, %43
  store i32 %44, ptr %3, align 4, !tbaa !9
  br label %45

45:                                               ; preds = %41, %13
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  %46 = load i32, ptr %3, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret i32 %46
}

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


; 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 i32 @sglib_dllist_len(ptr noundef readonly %0) local_unnamed_addr #0 {
  %2 = icmp eq ptr %0, null
  br i1 %2, label %9, label %.preheader20

.preheader20:                                     ; preds = %1, %.preheader20
  %.01522 = phi ptr [ %4, %.preheader20 ], [ %0, %1 ]
  %.01621 = phi i32 [ %5, %.preheader20 ], [ 0, %1 ]
  %3 = getelementptr inbounds i8, ptr %.01522, i64 16
  %4 = load ptr, ptr %3, align 8, !tbaa !5
  %5 = add nuw nsw i32 %.01621, 1
  %.not = icmp eq ptr %4, null
  br i1 %.not, label %.preheader, label %.preheader20, !llvm.loop !11

.preheader:                                       ; preds = %.preheader20, %.preheader
  %.017 = phi i32 [ %6, %.preheader ], [ 0, %.preheader20 ]
  %.pn = phi ptr [ %.0, %.preheader ], [ %0, %.preheader20 ]
  %.0.in = getelementptr inbounds i8, ptr %.pn, i64 8
  %.0 = load ptr, ptr %.0.in, align 8, !tbaa !13
  %.not19 = icmp eq ptr %.0, null
  %6 = add nuw nsw i32 %.017, 1
  br i1 %.not19, label %7, label %.preheader, !llvm.loop !14

7:                                                ; preds = %.preheader
  %8 = add nuw nsw i32 %.017, %5
  br label %9

9:                                                ; preds = %1, %7
  %.014 = phi i32 [ %8, %7 ], [ 0, %1 ]
  ret i32 %.014
}

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, !10, i64 16}
!6 = !{!"dllist", !7, i64 0, !10, i64 8, !10, i64 16}
!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 = !{!6, !10, i64 8}
!14 = distinct !{!14, !12}


; Effective O3 passes: GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass