diff --git a/src/Common/StringUtils.cpp b/src/Common/StringUtils.cpp
index f61a39851e2..18577e64c01 100644
--- a/src/Common/StringUtils.cpp
+++ b/src/Common/StringUtils.cpp
@@ -1,4 +1,10 @@
-#include "StringUtils.h"
+#include <Common/StringUtils.h>
+
+#include <Common/TargetSpecific.h>
+
+#if USE_MULTITARGET_CODE
+#include <immintrin.h>
+#endif
 
 
 namespace impl
@@ -15,3 +21,67 @@ bool endsWith(const std::string & s, const char * suffix, size_t suffix_size)
 }
 
 }
+
+DECLARE_DEFAULT_CODE(
+bool isAllASCII(const UInt8 * data, size_t size)
+{
+    UInt8 mask = 0;
+    for (size_t i = 0; i < size; ++i)
+        mask |= data[i];
+
+    return !(mask & 0x80);
+})
+
+DECLARE_SSE42_SPECIFIC_CODE(
+/// Copy from https://github.com/lemire/fastvalidate-utf-8/blob/master/include/simdasciicheck.h
+bool isAllASCII(const UInt8 * data, size_t size)
+{
+    __m128i masks = _mm_setzero_si128();
+
+    size_t i = 0;
+    for (; i + 16 <= size; i += 16)
+    {
+        __m128i bytes = _mm_loadu_si128(reinterpret_cast<const __m128i *>(data + i));
+        masks = _mm_or_si128(masks, bytes);
+    }
+    int mask = _mm_movemask_epi8(masks);
+
+    UInt8 tail_mask = 0;
+    for (; i < size; i++)
+        tail_mask |= data[i];
+
+    mask |= (tail_mask & 0x80);
+    return !mask;
+})
+
+DECLARE_AVX2_SPECIFIC_CODE(
+bool isAllASCII(const UInt8 * data, size_t size)
+{
+    __m256i masks = _mm256_setzero_si256();
+
+    size_t i = 0;
+    for (; i + 32 <= size; i += 32)
+    {
+        __m256i bytes = _mm256_loadu_si256(reinterpret_cast<const __m256i *>(data + i));
+        masks = _mm256_or_si256(masks, bytes);
+    }
+    int mask = _mm256_movemask_epi8(masks);
+
+    UInt8 tail_mask = 0;
+    for (; i < size; i++)
+        tail_mask |= data[i];
+
+    mask |= (tail_mask & 0x80);
+    return !mask;
+})
+
+bool isAllASCII(const UInt8 * data, size_t size)
+{
+#if USE_MULTITARGET_CODE
+    if (isArchSupported(DB::TargetArch::AVX2))
+        return TargetSpecific::AVX2::isAllASCII(data, size);
+    if (isArchSupported(DB::TargetArch::SSE42))
+        return TargetSpecific::SSE42::isAllASCII(data, size);
+#endif
+    return TargetSpecific::Default::isAllASCII(data, size);
+}
diff --git a/src/Common/StringUtils.h b/src/Common/StringUtils.h
index 051e4338714..fe5fc3c058f 100644
--- a/src/Common/StringUtils.h
+++ b/src/Common/StringUtils.h
@@ -7,6 +7,8 @@
 #include <cstdint>
 #include <type_traits>
 
+#include <base/types.h>
+
 
 namespace impl
 {
@@ -315,6 +317,9 @@ inline void trim(std::string & str, char c = ' ')
     trimLeft(str, c);
 }
 
+/// If all characters in the string are ASCII, return true
+bool isAllASCII(const UInt8 * data, size_t size);
+
 constexpr bool containsGlobs(const std::string & str)
 {
     return str.find_first_of("*?{") != std::string::npos;
diff --git a/src/Common/UTF8Helpers.cpp b/src/Common/UTF8Helpers.cpp
index 3c3cf61bbfc..8c8c8e8327b 100644
--- a/src/Common/UTF8Helpers.cpp
+++ b/src/Common/UTF8Helpers.cpp
@@ -1,14 +1,9 @@
-#include <Common/StringUtils.h>
-#include <Common/TargetSpecific.h>
 #include <Common/UTF8Helpers.h>
+#include <Common/StringUtils.h>
 
 #include <widechar_width.h>
 #include <bit>
 
-#if USE_MULTITARGET_CODE
-#include <immintrin.h>
-#endif
-
 namespace DB
 {
 namespace UTF8
@@ -208,7 +203,6 @@ size_t computeWidthImpl(const UInt8 * data, size_t size, size_t prefix, size_t l
 
 }
 
-
 size_t computeWidth(const UInt8 * data, size_t size, size_t prefix) noexcept
 {
     return computeWidthImpl<Width>(data, size, prefix, 0);
@@ -219,71 +213,5 @@ size_t computeBytesBeforeWidth(const UInt8 * data, size_t size, size_t prefix, s
     return computeWidthImpl<BytesBeforeLimit>(data, size, prefix, limit);
 }
 
-
-DECLARE_DEFAULT_CODE(
-bool isAllASCII(const UInt8 * data, size_t size)
-{
-    UInt8 mask = 0;
-    for (size_t i = 0; i < size; ++i)
-        mask |= data[i];
-
-    return !(mask & 0x80);
-})
-
-DECLARE_SSE42_SPECIFIC_CODE(
-/// Copy from https://github.com/lemire/fastvalidate-utf-8/blob/master/include/simdasciicheck.h
-bool isAllASCII(const UInt8 * data, size_t size)
-{
-    __m128i masks = _mm_setzero_si128();
-
-    size_t i = 0;
-    for (; i + 16 <= size; i += 16)
-    {
-        __m128i bytes = _mm_loadu_si128(reinterpret_cast<const __m128i *>(data + i));
-        masks = _mm_or_si128(masks, bytes);
-    }
-    int mask = _mm_movemask_epi8(masks);
-
-    UInt8 tail_mask = 0;
-    for (; i < size; i++)
-        tail_mask |= data[i];
-
-    mask |= (tail_mask & 0x80);
-    return !mask;
-})
-
-DECLARE_AVX2_SPECIFIC_CODE(
-bool isAllASCII(const UInt8 * data, size_t size)
-{
-    __m256i masks = _mm256_setzero_si256();
-
-    size_t i = 0;
-    for (; i + 32 <= size; i += 32)
-    {
-        __m256i bytes = _mm256_loadu_si256(reinterpret_cast<const __m256i *>(data + i));
-        masks = _mm256_or_si256(masks, bytes);
-    }
-    int mask = _mm256_movemask_epi8(masks);
-
-    UInt8 tail_mask = 0;
-    for (; i < size; i++)
-        tail_mask |= data[i];
-
-    mask |= (tail_mask & 0x80);
-    return !mask;
-})
-
-bool isAllASCII(const UInt8* data, size_t size)
-{
-#if USE_MULTITARGET_CODE
-    if (isArchSupported(TargetArch::AVX2))
-        return TargetSpecific::AVX2::isAllASCII(data, size);
-    if (isArchSupported(TargetArch::SSE42))
-        return TargetSpecific::SSE42::isAllASCII(data, size);
-#endif
-    return TargetSpecific::Default::isAllASCII(data, size);
-}
-
-
 }
 }
diff --git a/src/Common/UTF8Helpers.h b/src/Common/UTF8Helpers.h
index 933b62c7b63..b09d92bd731 100644
--- a/src/Common/UTF8Helpers.h
+++ b/src/Common/UTF8Helpers.h
@@ -136,10 +136,6 @@ size_t computeWidth(const UInt8 * data, size_t size, size_t prefix = 0) noexcept
   */
 size_t computeBytesBeforeWidth(const UInt8 * data, size_t size, size_t prefix, size_t limit) noexcept;
 
-
-/// If all the characters in the string are ASCII, return true.
-bool isAllASCII(const UInt8* data, size_t size);
-
 }
 
 }
diff --git a/src/Functions/LowerUpperUTF8Impl.h b/src/Functions/LowerUpperUTF8Impl.h
index bb794a0f8ed..eebba7b9d5f 100644
--- a/src/Functions/LowerUpperUTF8Impl.h
+++ b/src/Functions/LowerUpperUTF8Impl.h
@@ -3,6 +3,7 @@
 #include <Functions/LowerUpperImpl.h>
 #include <base/defines.h>
 #include <Poco/UTF8Encoding.h>
+#include <Common/StringUtils.h>
 #include <Common/UTF8Helpers.h>
 
 #ifdef __SSE2__
@@ -94,7 +95,7 @@ struct LowerUpperUTF8Impl
         if (data.empty())
             return;
 
-        bool all_ascii = UTF8::isAllASCII(data.data(), data.size());
+        bool all_ascii = isAllASCII(data.data(), data.size());
         if (all_ascii)
         {
             LowerUpperImpl<not_case_lower_bound, not_case_upper_bound>::vector(data, offsets, res_data, res_offsets);
diff --git a/src/Functions/padString.cpp b/src/Functions/padString.cpp
index 0922e0ddb8a..8670c837e21 100644
--- a/src/Functions/padString.cpp
+++ b/src/Functions/padString.cpp
@@ -1,4 +1,5 @@
 #include <Columns/ColumnFixedString.h>
+#include <Common/StringUtils.h>
 #include <Columns/ColumnString.h>
 #include <DataTypes/DataTypeString.h>
 #include <Functions/FunctionFactory.h>
@@ -237,8 +238,8 @@ namespace
         void executeForSource(SourceStrings && strings, const ColumnPtr & column_length, const String & pad_string, StringSink & res_sink) const
         {
             const auto & chars = strings.getElements();
-            bool all_ascii = UTF8::isAllASCII(reinterpret_cast<const UInt8 *>(pad_string.data()), pad_string.size())
-                && UTF8::isAllASCII(chars.data(), chars.size());
+            bool all_ascii = isAllASCII(reinterpret_cast<const UInt8 *>(pad_string.data()), pad_string.size())
+                && isAllASCII(chars.data(), chars.size());
             bool is_actually_utf8 = is_utf8 && !all_ascii;
 
             if (!is_actually_utf8)
diff --git a/src/Functions/reverseUTF8.cpp b/src/Functions/reverseUTF8.cpp
index 4ea861919a1..1aee349fa8d 100644
--- a/src/Functions/reverseUTF8.cpp
+++ b/src/Functions/reverseUTF8.cpp
@@ -2,6 +2,7 @@
 #include <DataTypes/DataTypeString.h>
 #include <Functions/FunctionFactory.h>
 #include <Functions/FunctionStringToString.h>
+#include <Common/StringUtils.h>
 #include <Common/UTF8Helpers.h>
 #include "reverse.h"
 
@@ -27,7 +28,7 @@ struct ReverseUTF8Impl
         ColumnString::Chars & res_data,
         ColumnString::Offsets & res_offsets)
     {
-        bool all_ascii = UTF8::isAllASCII(data.data(), data.size());
+        bool all_ascii = isAllASCII(data.data(), data.size());
         if (all_ascii)
         {
             ReverseImpl::vector(data, offsets, res_data, res_offsets);
diff --git a/src/Functions/substring.cpp b/src/Functions/substring.cpp
index 122f83d758b..f1dea7db018 100644
--- a/src/Functions/substring.cpp
+++ b/src/Functions/substring.cpp
@@ -1,6 +1,7 @@
 #include <Columns/ColumnConst.h>
 #include <Columns/ColumnFixedString.h>
 #include <Columns/ColumnString.h>
+#include <Common/StringUtils.h>
 #include <DataTypes/DataTypeEnum.h>
 #include <DataTypes/DataTypeString.h>
 #include <Functions/FunctionFactory.h>
@@ -149,7 +150,7 @@ public:
         {
             if (const ColumnString * col = checkAndGetColumn<ColumnString>(column_string.get()))
             {
-                bool all_ascii = UTF8::isAllASCII(col->getChars().data(), col->getChars().size());
+                bool all_ascii = isAllASCII(col->getChars().data(), col->getChars().size());
                 if (all_ascii)
                     return executeForSource(column_offset, column_length, column_offset_const, column_length_const, offset, length, StringSource(*col), input_rows_count);
                 else
@@ -159,7 +160,7 @@ public:
             if (const ColumnConst * col_const = checkAndGetColumnConst<ColumnString>(column_string.get()))
             {
                 StringRef str_ref = col_const->getDataAt(0);
-                bool all_ascii = UTF8::isAllASCII(reinterpret_cast<const UInt8 *>(str_ref.data), str_ref.size);
+                bool all_ascii = isAllASCII(reinterpret_cast<const UInt8 *>(str_ref.data), str_ref.size);
                 if (all_ascii)
                     return executeForSource(column_offset, column_length, column_offset_const, column_length_const, offset, length, ConstSource<StringSource>(*col_const), input_rows_count);
                 else
diff --git a/src/Functions/substringIndex.cpp b/src/Functions/substringIndex.cpp
index 74474cb4b23..15a321bd5b0 100644
--- a/src/Functions/substringIndex.cpp
+++ b/src/Functions/substringIndex.cpp
@@ -7,6 +7,7 @@
 #include <Functions/PositionImpl.h>
 #include <Interpreters/Context_fwd.h>
 #include <base/find_symbols.h>
+#include <Common/StringUtils.h>
 #include <Common/UTF8Helpers.h>
 #include <Common/register_objects.h>
 
@@ -129,8 +130,8 @@ namespace
             res_data.reserve(str_column->getChars().size() / 2);
             res_offsets.reserve(rows);
 
-            bool all_ascii = UTF8::isAllASCII(str_column->getChars().data(), str_column->getChars().size())
-                && UTF8::isAllASCII(reinterpret_cast<const UInt8 *>(delim.data()), delim.size());
+            bool all_ascii = isAllASCII(str_column->getChars().data(), str_column->getChars().size())
+                && isAllASCII(reinterpret_cast<const UInt8 *>(delim.data()), delim.size());
             std::unique_ptr<PositionCaseSensitiveUTF8::SearcherInBigHaystack> searcher
                 = !is_utf8 || all_ascii ? nullptr : std::make_unique<PositionCaseSensitiveUTF8::SearcherInBigHaystack>(delim.data(), delim.size());
 
@@ -162,8 +163,8 @@ namespace
             res_data.reserve(str_column->getChars().size() / 2);
             res_offsets.reserve(rows);
 
-            bool all_ascii = UTF8::isAllASCII(str_column->getChars().data(), str_column->getChars().size())
-                && UTF8::isAllASCII(reinterpret_cast<const UInt8 *>(delim.data()), delim.size());
+            bool all_ascii = isAllASCII(str_column->getChars().data(), str_column->getChars().size())
+                && isAllASCII(reinterpret_cast<const UInt8 *>(delim.data()), delim.size());
             std::unique_ptr<PositionCaseSensitiveUTF8::SearcherInBigHaystack> searcher
                 = !is_utf8 || all_ascii ? nullptr : std::make_unique<PositionCaseSensitiveUTF8::SearcherInBigHaystack>(delim.data(), delim.size());
 
@@ -194,8 +195,8 @@ namespace
             res_data.reserve(str.size() * rows / 2);
             res_offsets.reserve(rows);
 
-            bool all_ascii = UTF8::isAllASCII(reinterpret_cast<const UInt8 *>(str.data()), str.size())
-                && UTF8::isAllASCII(reinterpret_cast<const UInt8 *>(delim.data()), delim.size());
+            bool all_ascii = isAllASCII(reinterpret_cast<const UInt8 *>(str.data()), str.size())
+                && isAllASCII(reinterpret_cast<const UInt8 *>(delim.data()), delim.size());
             std::unique_ptr<PositionCaseSensitiveUTF8::SearcherInBigHaystack> searcher
                 = !is_utf8 || all_ascii ? nullptr : std::make_unique<PositionCaseSensitiveUTF8::SearcherInBigHaystack>(delim.data(), delim.size());