; 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 i32 @strncmp16(ptr noundef %0, ptr noundef %1, i64 noundef %2) #1 {
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i64, align 8
  %8 = alloca i16, align 2
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !5
  store i64 %2, ptr %7, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 2, ptr %8) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  store i32 0, ptr %9, align 4, !tbaa !11
  %11 = load i64, ptr %7, align 8, !tbaa !9
  %12 = icmp eq i64 %11, 0
  br i1 %12, label %13, label %14

13:                                               ; preds = %3
  store i32 0, ptr %4, align 4
  store i32 1, ptr %10, align 4
  br label %38

14:                                               ; preds = %3
  br label %15

15:                                               ; preds = %32, %14
  %16 = load ptr, ptr %5, align 8, !tbaa !5
  %17 = getelementptr inbounds i16, ptr %16, i32 1
  store ptr %17, ptr %5, align 8, !tbaa !5
  %18 = load i16, ptr %16, align 2, !tbaa !13
  store i16 %18, ptr %8, align 2, !tbaa !13
  %19 = zext i16 %18 to i32
  %20 = load ptr, ptr %6, align 8, !tbaa !5
  %21 = getelementptr inbounds i16, ptr %20, i32 1
  store ptr %21, ptr %6, align 8, !tbaa !5
  %22 = load i16, ptr %20, align 2, !tbaa !13
  %23 = zext i16 %22 to i32
  %24 = sub nsw i32 %19, %23
  store i32 %24, ptr %9, align 4, !tbaa !11
  %25 = load i32, ptr %9, align 4, !tbaa !11
  %26 = icmp ne i32 %25, 0
  br i1 %26, label %30, label %27

27:                                               ; preds = %15
  %28 = load i16, ptr %8, align 2, !tbaa !13
  %29 = icmp ne i16 %28, 0
  br i1 %29, label %31, label %30

30:                                               ; preds = %27, %15
  br label %36

31:                                               ; preds = %27
  br label %32

32:                                               ; preds = %31
  %33 = load i64, ptr %7, align 8, !tbaa !9
  %34 = add i64 %33, -1
  store i64 %34, ptr %7, align 8, !tbaa !9
  %35 = icmp ne i64 %34, 0
  br i1 %35, label %15, label %36, !llvm.loop !15

36:                                               ; preds = %32, %30
  %37 = load i32, ptr %9, align 4, !tbaa !11
  store i32 %37, ptr %4, align 4
  store i32 1, ptr %10, align 4
  br label %38

38:                                               ; preds = %36, %13
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  call void @llvm.lifetime.end.p0(i64 2, ptr %8) #2
  %39 = load i32, ptr %4, align 4
  ret i32 %39
}

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 = !{!"int", !7, i64 0}
!13 = !{!14, !14, i64 0}
!14 = !{!"char16_t", !7, i64 0}
!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: mustprogress nofree norecurse nosync nounwind willreturn memory(read, inaccessiblemem: none) uwtable
define dso_local range(i32 -65535, 65536) i32 @strncmp16(ptr nocapture noundef readonly %0, ptr nocapture noundef readonly %1, i64 noundef %2) local_unnamed_addr #0 {
  %4 = icmp eq i64 %2, 0
  br i1 %4, label %.loopexit, label %.preheader

.preheader:                                       ; preds = %3, %.preheader
  %.010 = phi ptr [ %13, %.preheader ], [ %0, %3 ]
  %.09 = phi ptr [ %12, %.preheader ], [ %1, %3 ]
  %.08 = phi i64 [ %14, %.preheader ], [ %2, %3 ]
  %5 = load i16, ptr %.010, align 2, !tbaa !5
  %6 = zext i16 %5 to i32
  %7 = load i16, ptr %.09, align 2, !tbaa !5
  %8 = zext i16 %7 to i32
  %9 = sub nsw i32 %6, %8
  %10 = icmp ne i32 %9, 0
  %11 = icmp eq i16 %5, 0
  %or.cond.not18 = or i1 %11, %10
  %12 = getelementptr inbounds i8, ptr %.09, i64 2
  %13 = getelementptr inbounds i8, ptr %.010, i64 2
  %14 = add i64 %.08, -1
  %.not = icmp eq i64 %14, 0
  %or.cond15 = select i1 %or.cond.not18, i1 true, i1 %.not
  br i1 %or.cond15, label %.loopexit, label %.preheader, !llvm.loop !9

.loopexit:                                        ; preds = %.preheader, %3
  %.0 = phi i32 [ 0, %3 ], [ %9, %.preheader ]
  ret i32 %.0
}

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: GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass