; LLVM IR from facebook/redex :: libresource (Unicode)

; 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"

; 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: mustprogress nounwind uwtable
define dso_local i64 @strnlen16(ptr noundef %0, i64 noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca i64, align 8
  %5 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i64 %1, ptr %4, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  %6 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %6, ptr %5, align 8, !tbaa !5
  br label %7

7:                                                ; preds = %16, %2
  %8 = load i64, ptr %4, align 8, !tbaa !9
  %9 = icmp ugt i64 %8, 0
  br i1 %9, label %10, label %14

10:                                               ; preds = %7
  %11 = load ptr, ptr %5, align 8, !tbaa !5
  %12 = load i16, ptr %11, align 2, !tbaa !11
  %13 = icmp ne i16 %12, 0
  br label %14

14:                                               ; preds = %10, %7
  %15 = phi i1 [ false, %7 ], [ %13, %10 ]
  br i1 %15, label %16, label %21

16:                                               ; preds = %14
  %17 = load ptr, ptr %5, align 8, !tbaa !5
  %18 = getelementptr inbounds i16, ptr %17, i32 1
  store ptr %18, ptr %5, align 8, !tbaa !5
  %19 = load i64, ptr %4, align 8, !tbaa !9
  %20 = add i64 %19, -1
  store i64 %20, ptr %4, align 8, !tbaa !9
  br label %7, !llvm.loop !13

21:                                               ; preds = %14
  %22 = load ptr, ptr %5, align 8, !tbaa !5
  %23 = load ptr, ptr %3, align 8, !tbaa !5
  %24 = ptrtoint ptr %22 to i64
  %25 = ptrtoint ptr %23 to i64
  %26 = sub i64 %24, %25
  %27 = sdiv exact i64 %26, 2
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  ret i64 %27
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress 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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"long", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"char16_t", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"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: mustprogress nofree norecurse nosync nounwind willreturn memory(read, inaccessiblemem: none) uwtable
define dso_local range(i64 -4611686018427387904, 4611686018427387904) i64 @strnlen16(ptr noundef %0, i64 noundef %1) local_unnamed_addr #0 {
  %.not8 = icmp eq i64 %1, 0
  br i1 %.not8, label %.critedge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %2
  %3 = shl i64 %1, 1
  %scevgep = getelementptr i8, ptr %0, i64 %3
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %5
  %.010 = phi ptr [ %6, %5 ], [ %0, %.lr.ph.preheader ]
  %.069 = phi i64 [ %7, %5 ], [ %1, %.lr.ph.preheader ]
  %4 = load i16, ptr %.010, align 2, !tbaa !5
  %.not7 = icmp eq i16 %4, 0
  br i1 %.not7, label %.critedge, label %5

5:                                                ; preds = %.lr.ph
  %6 = getelementptr inbounds i8, ptr %.010, i64 2
  %7 = add i64 %.069, -1
  %.not = icmp eq i64 %7, 0
  br i1 %.not, label %.critedge, label %.lr.ph, !llvm.loop !9

.critedge:                                        ; preds = %.lr.ph, %5, %2
  %.0.lcssa = phi ptr [ %0, %2 ], [ %scevgep, %5 ], [ %.010, %.lr.ph ]
  %8 = ptrtoint ptr %.0.lcssa to i64
  %9 = ptrtoint ptr %0 to i64
  %10 = sub i64 %8, %9
  %11 = ashr exact i64 %10, 1
  ret i64 %11
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn 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 = !{!"char16_t", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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