; 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: mustprogress nounwind uwtable
define dso_local noundef ptr @_ZN11__sanitizer15internal_memchrEPKvim(ptr noundef %0, i32 noundef %1, i64 noundef %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i64, align 8
  %8 = alloca ptr, align 8
  %9 = alloca i64, align 8
  %10 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store i32 %1, ptr %6, align 4, !tbaa !9
  store i64 %2, ptr %7, align 8, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  %11 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %11, ptr %8, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #2
  store i64 0, ptr %9, align 8, !tbaa !11
  br label %12

12:                                               ; preds = %26, %3
  %13 = load i64, ptr %9, align 8, !tbaa !11
  %14 = load i64, ptr %7, align 8, !tbaa !11
  %15 = icmp ult i64 %13, %14
  br i1 %15, label %17, label %16

16:                                               ; preds = %12
  store i32 2, ptr %10, align 4
  br label %31

17:                                               ; preds = %12
  %18 = load ptr, ptr %8, align 8, !tbaa !5
  %19 = load i8, ptr %18, align 1, !tbaa !13
  %20 = sext i8 %19 to i32
  %21 = load i32, ptr %6, align 4, !tbaa !9
  %22 = icmp eq i32 %20, %21
  br i1 %22, label %23, label %25

23:                                               ; preds = %17
  %24 = load ptr, ptr %8, align 8, !tbaa !5
  store ptr %24, ptr %4, align 8
  store i32 1, ptr %10, align 4
  br label %31

25:                                               ; preds = %17
  br label %26

26:                                               ; preds = %25
  %27 = load i64, ptr %9, align 8, !tbaa !11
  %28 = add i64 %27, 1
  store i64 %28, ptr %9, align 8, !tbaa !11
  %29 = load ptr, ptr %8, align 8, !tbaa !5
  %30 = getelementptr inbounds i8, ptr %29, i32 1
  store ptr %30, ptr %8, align 8, !tbaa !5
  br label %12, !llvm.loop !14

31:                                               ; preds = %23, %16
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #2
  %32 = load i32, ptr %10, align 4
  switch i32 %32, label %34 [
    i32 2, label %33
  ]

33:                                               ; preds = %31
  store ptr null, ptr %4, align 8
  store i32 1, ptr %10, align 4
  br label %34

34:                                               ; preds = %33, %31
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  %35 = load ptr, ptr %4, align 8
  ret ptr %35
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

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" }
attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = !{!"int", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"long", !7, i64 0}
!13 = !{!7, !7, i64 0}
!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: mustprogress nofree norecurse nosync nounwind willreturn memory(read, inaccessiblemem: none) uwtable
define dso_local noundef ptr @_ZN11__sanitizer15internal_memchrEPKvim(ptr noundef readonly %0, i32 noundef %1, i64 noundef %2) local_unnamed_addr #0 {
  %.not12.not = icmp eq i64 %2, 0
  br i1 %.not12.not, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %3, %7
  %.0914 = phi i64 [ %8, %7 ], [ 0, %3 ]
  %.01013 = phi ptr [ %9, %7 ], [ %0, %3 ]
  %4 = load i8, ptr %.01013, align 1, !tbaa !5
  %5 = sext i8 %4 to i32
  %6 = icmp eq i32 %5, %1
  br i1 %6, label %._crit_edge, label %7

7:                                                ; preds = %.lr.ph
  %8 = add nuw i64 %.0914, 1
  %9 = getelementptr inbounds i8, ptr %.01013, i64 1
  %exitcond.not = icmp eq i64 %8, %2
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !8

._crit_edge:                                      ; preds = %7, %.lr.ph, %3
  %spec.select = phi ptr [ null, %3 ], [ %.01013, %.lr.ph ], [ null, %7 ]
  ret ptr %spec.select
}

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


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