; LLVM IR from AngoraFuzzer/Angora :: llvm_mode/dfsan_rt/sanitizer_common (sanitizer_libc)

; 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
declare dso_local noundef i64 @_ZN11__sanitizer15internal_strlenEPKc(ptr noundef) #1

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef ptr @_ZN11__sanitizer16internal_strncatEPcPKcm(ptr noundef %0, ptr noundef %1, i64 noundef %2) #1 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i64, align 8
  %7 = alloca i64, align 8
  %8 = alloca i64, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store i64 %2, ptr %6, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  %9 = load ptr, ptr %4, align 8, !tbaa !5
  %10 = call noundef i64 @_ZN11__sanitizer15internal_strlenEPKc(ptr noundef %9)
  store i64 %10, ptr %7, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  store i64 0, ptr %8, align 8, !tbaa !9
  br label %11

11:                                               ; preds = %33, %3
  %12 = load i64, ptr %8, align 8, !tbaa !9
  %13 = load i64, ptr %6, align 8, !tbaa !9
  %14 = icmp ult i64 %12, %13
  br i1 %14, label %15, label %21

15:                                               ; preds = %11
  %16 = load ptr, ptr %5, align 8, !tbaa !5
  %17 = load i64, ptr %8, align 8, !tbaa !9
  %18 = getelementptr inbounds i8, ptr %16, i64 %17
  %19 = load i8, ptr %18, align 1, !tbaa !11
  %20 = icmp ne i8 %19, 0
  br label %21

21:                                               ; preds = %15, %11
  %22 = phi i1 [ false, %11 ], [ %20, %15 ]
  br i1 %22, label %23, label %36

23:                                               ; preds = %21
  %24 = load ptr, ptr %5, align 8, !tbaa !5
  %25 = load i64, ptr %8, align 8, !tbaa !9
  %26 = getelementptr inbounds i8, ptr %24, i64 %25
  %27 = load i8, ptr %26, align 1, !tbaa !11
  %28 = load ptr, ptr %4, align 8, !tbaa !5
  %29 = load i64, ptr %7, align 8, !tbaa !9
  %30 = load i64, ptr %8, align 8, !tbaa !9
  %31 = add i64 %29, %30
  %32 = getelementptr inbounds i8, ptr %28, i64 %31
  store i8 %27, ptr %32, align 1, !tbaa !11
  br label %33

33:                                               ; preds = %23
  %34 = load i64, ptr %8, align 8, !tbaa !9
  %35 = add i64 %34, 1
  store i64 %35, ptr %8, align 8, !tbaa !9
  br label %11, !llvm.loop !12

36:                                               ; preds = %21
  %37 = load ptr, ptr %4, align 8, !tbaa !5
  %38 = load i64, ptr %7, align 8, !tbaa !9
  %39 = load i64, ptr %8, align 8, !tbaa !9
  %40 = add i64 %38, %39
  %41 = getelementptr inbounds i8, ptr %37, i64 %40
  store i8 0, ptr %41, align 1, !tbaa !11
  %42 = load ptr, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  ret ptr %42
}

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 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"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 nounwind uwtable
declare dso_local noundef i64 @_ZN11__sanitizer15internal_strlenEPKc(ptr noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef ptr @_ZN11__sanitizer16internal_strncatEPcPKcm(ptr noundef returned %0, ptr nocapture noundef readonly %1, i64 noundef %2) local_unnamed_addr #0 {
  %4 = tail call noundef i64 @_ZN11__sanitizer15internal_strlenEPKc(ptr noundef %0)
  %.not18 = icmp eq i64 %2, 0
  br i1 %.not18, label %.critedge, label %.lr.ph

.lr.ph:                                           ; preds = %3
  %5 = getelementptr i8, ptr %0, i64 %4
  br label %6

6:                                                ; preds = %.lr.ph, %9
  %.015 = phi i64 [ 0, %.lr.ph ], [ %11, %9 ]
  %7 = getelementptr inbounds i8, ptr %1, i64 %.015
  %8 = load i8, ptr %7, align 1, !tbaa !5
  %.not = icmp eq i8 %8, 0
  br i1 %.not, label %.critedge, label %9

9:                                                ; preds = %6
  %10 = getelementptr i8, ptr %5, i64 %.015
  store i8 %8, ptr %10, align 1, !tbaa !5
  %11 = add nuw i64 %.015, 1
  %exitcond.not = icmp eq i64 %11, %2
  br i1 %exitcond.not, label %.critedge, label %6, !llvm.loop !8

.critedge:                                        ; preds = %6, %9, %3
  %.0.lcssa = phi i64 [ 0, %3 ], [ %2, %9 ], [ %.015, %6 ]
  %12 = getelementptr i8, ptr %0, i64 %4
  %13 = getelementptr i8, ptr %12, i64 %.0.lcssa
  store i8 0, ptr %13, align 1, !tbaa !5
  ret ptr %0
}

attributes #0 = { 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" }

!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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


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