; LLVM IR from lekkas/c-algorithms :: src/algos (SingleList)

; 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.SingleList = type { ptr, %struct.DataOps }
%struct.DataOps = type { ptr, ptr }
%struct.SingleListNode = type { 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 @hasLoop(ptr noundef %0) #1 {
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  %7 = load ptr, ptr %3, align 8, !tbaa !5
  %8 = getelementptr inbounds %struct.SingleList, ptr %7, i32 0, i32 0
  %9 = load ptr, ptr %8, align 8, !tbaa !9
  store ptr %9, ptr %4, align 8, !tbaa !5
  %10 = load ptr, ptr %3, align 8, !tbaa !5
  %11 = getelementptr inbounds %struct.SingleList, ptr %10, i32 0, i32 0
  %12 = load ptr, ptr %11, align 8, !tbaa !9
  store ptr %12, ptr %5, align 8, !tbaa !5
  br label %13

13:                                               ; preds = %55, %1
  %14 = load ptr, ptr %4, align 8, !tbaa !5
  %15 = icmp ne ptr %14, null
  br i1 %15, label %16, label %60

16:                                               ; preds = %13
  %17 = load ptr, ptr %4, align 8, !tbaa !5
  %18 = getelementptr inbounds %struct.SingleListNode, ptr %17, i32 0, i32 1
  %19 = load ptr, ptr %18, align 8, !tbaa !12
  %20 = load ptr, ptr %5, align 8, !tbaa !5
  %21 = icmp eq ptr %19, %20
  br i1 %21, label %35, label %22

22:                                               ; preds = %16
  %23 = load ptr, ptr %4, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct.SingleListNode, ptr %23, i32 0, i32 1
  %25 = load ptr, ptr %24, align 8, !tbaa !12
  %26 = icmp ne ptr %25, null
  br i1 %26, label %27, label %36

27:                                               ; preds = %22
  %28 = load ptr, ptr %4, align 8, !tbaa !5
  %29 = getelementptr inbounds %struct.SingleListNode, ptr %28, i32 0, i32 1
  %30 = load ptr, ptr %29, align 8, !tbaa !12
  %31 = getelementptr inbounds %struct.SingleListNode, ptr %30, i32 0, i32 1
  %32 = load ptr, ptr %31, align 8, !tbaa !12
  %33 = load ptr, ptr %5, align 8, !tbaa !5
  %34 = icmp eq ptr %32, %33
  br i1 %34, label %35, label %36

35:                                               ; preds = %27, %16
  store i32 1, ptr %2, align 4
  store i32 1, ptr %6, align 4
  br label %61

36:                                               ; preds = %27, %22
  %37 = load ptr, ptr %4, align 8, !tbaa !5
  %38 = getelementptr inbounds %struct.SingleListNode, ptr %37, i32 0, i32 1
  %39 = load ptr, ptr %38, align 8, !tbaa !12
  %40 = icmp ne ptr %39, null
  br i1 %40, label %41, label %54

41:                                               ; preds = %36
  %42 = load ptr, ptr %4, align 8, !tbaa !5
  %43 = getelementptr inbounds %struct.SingleListNode, ptr %42, i32 0, i32 1
  %44 = load ptr, ptr %43, align 8, !tbaa !12
  %45 = getelementptr inbounds %struct.SingleListNode, ptr %44, i32 0, i32 1
  %46 = load ptr, ptr %45, align 8, !tbaa !12
  %47 = icmp ne ptr %46, null
  br i1 %47, label %48, label %54

48:                                               ; preds = %41
  %49 = load ptr, ptr %4, align 8, !tbaa !5
  %50 = getelementptr inbounds %struct.SingleListNode, ptr %49, i32 0, i32 1
  %51 = load ptr, ptr %50, align 8, !tbaa !12
  %52 = getelementptr inbounds %struct.SingleListNode, ptr %51, i32 0, i32 1
  %53 = load ptr, ptr %52, align 8, !tbaa !12
  br label %55

54:                                               ; preds = %41, %36
  br label %55

55:                                               ; preds = %54, %48
  %56 = phi ptr [ %53, %48 ], [ null, %54 ]
  store ptr %56, ptr %4, align 8, !tbaa !5
  %57 = load ptr, ptr %5, align 8, !tbaa !5
  %58 = getelementptr inbounds %struct.SingleListNode, ptr %57, i32 0, i32 1
  %59 = load ptr, ptr %58, align 8, !tbaa !12
  store ptr %59, ptr %5, align 8, !tbaa !5
  br label %13, !llvm.loop !14

60:                                               ; preds = %13
  store i32 0, ptr %2, align 4
  store i32 1, ptr %6, align 4
  br label %61

61:                                               ; preds = %60, %35
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  %62 = load i32, ptr %2, align 4
  ret i32 %62
}

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 = !{!"SingleList", !6, i64 0, !11, i64 8}
!11 = !{!"DataOps", !6, i64 0, !6, i64 8}
!12 = !{!13, !6, i64 8}
!13 = !{!"SingleListNode", !6, i64 0, !6, i64 8}
!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 range(i32 0, 2) i32 @hasLoop(ptr nocapture noundef readonly %0) local_unnamed_addr #0 {
  %2 = load ptr, ptr %0, align 8, !tbaa !5
  %.not20 = icmp eq ptr %2, null
  br i1 %.not20, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1, %.thread
  %.022 = phi ptr [ %12, %.thread ], [ %2, %1 ]
  %.01221 = phi ptr [ %9, %.thread ], [ %2, %1 ]
  %3 = getelementptr inbounds i8, ptr %.01221, i64 8
  %4 = load ptr, ptr %3, align 8, !tbaa !11
  %5 = icmp eq ptr %4, %.022
  br i1 %5, label %._crit_edge, label %6

6:                                                ; preds = %.lr.ph
  %.not17 = icmp eq ptr %4, null
  br i1 %.not17, label %._crit_edge, label %7

7:                                                ; preds = %6
  %8 = getelementptr inbounds i8, ptr %4, i64 8
  %9 = load ptr, ptr %8, align 8, !tbaa !11
  %10 = icmp eq ptr %9, %.022
  br i1 %10, label %._crit_edge, label %.thread

.thread:                                          ; preds = %7
  %11 = getelementptr inbounds i8, ptr %.022, i64 8
  %12 = load ptr, ptr %11, align 8, !tbaa !11
  %.not = icmp eq ptr %9, null
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !13

._crit_edge:                                      ; preds = %6, %7, %.lr.ph, %.thread, %1
  %.013 = phi i32 [ 0, %1 ], [ 0, %6 ], [ 0, %.thread ], [ 1, %.lr.ph ], [ 1, %7 ]
  ret i32 %.013
}

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


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