diff --git a/src/layer/x86/convolution_x86.cpp b/src/layer/x86/convolution_x86.cpp
index 65ee41b332d..acaeedaac22 100644
--- a/src/layer/x86/convolution_x86.cpp
+++ b/src/layer/x86/convolution_x86.cpp
@@ -993,7 +993,18 @@ int Convolution_x86::forward_int8_x86(const Mat& bottom_blob, Mat& top_blob, con
 #if __SSE2__
     if (opt.use_packing_layout)
     {
-        out_elempack_int32 = num_output % 4 == 0 ? 4 : 1;
+        if (use_int8_requantize)
+        {
+#if __AVX__
+            out_elempack_int32 = num_output % 8 == 0 ? 8 : 1;
+#else
+            out_elempack_int32 = num_output % 4 == 0 ? 4 : 1;
+#endif
+        }
+        else
+        {
+            out_elempack_int32 = num_output % 4 == 0 ? 4 : 1;
+        }
     }
 #endif // __SSE2__
 
diff --git a/src/layer/x86/requantize_x86.cpp b/src/layer/x86/requantize_x86.cpp
index 69d730bdc2b..a2e7385dac1 100644
--- a/src/layer/x86/requantize_x86.cpp
+++ b/src/layer/x86/requantize_x86.cpp
@@ -331,70 +331,6 @@ static void requantize(const int* intptr, signed char* ptr, const Mat& scale_in_
 }
 
 #if __SSE2__
-#if __AVX512F__
-static void requantize_pack16to8(const int* intptr, signed char* ptr0, signed char* ptr1, const Mat& scale_in_data, const Mat& bias_data, const Mat& scale_out_data, int activation_type, const Mat& activation_params, int elemcount)
-{
-    const int scale_in_data_size = scale_in_data.w;
-    const int bias_data_size = bias_data.w;
-    const int scale_out_data_size = scale_out_data.w;
-
-    // NCNN_LOGE("requantize_pack16to8 %d %d %d   %d", scale_in_data_size, bias_data_size, scale_out_data_size, elemcount);
-
-    __m512 _scale_in = _mm512_set1_ps(scale_in_data[0]);
-    if (scale_in_data_size > 1)
-    {
-        _scale_in = _mm512_loadu_ps((const float*)scale_in_data);
-    }
-
-    __m512 _scale_out = _mm512_set1_ps(scale_out_data[0]);
-    if (scale_out_data_size > 1)
-    {
-        _scale_out = _mm512_loadu_ps((const float*)scale_out_data);
-    }
-
-    if (bias_data_size == 0)
-    {
-        int i = 0;
-        for (; i < elemcount; i++)
-        {
-            __m512 _v = _mm512_cvtepi32_ps(_mm512_loadu_si512((const __m512i*)intptr));
-            _v = _mm512_mul_ps(_v, _scale_in);
-            _v = activation_avx512(_v, activation_type, activation_params);
-            _v = _mm512_mul_ps(_v, _scale_out);
-            __m128i v = float2int8_avx512(_v);
-            _mm_storel_pd((double*)ptr0, _mm_castsi128_pd(v));
-            _mm_storeh_pd((double*)ptr1, _mm_castsi128_pd(v));
-            intptr += 16;
-            ptr0 += 8;
-            ptr1 += 8;
-        }
-    }
-    else
-    {
-        __m512 _bias = _mm512_set1_ps(bias_data[0]);
-        if (bias_data_size > 1)
-        {
-            _bias = _mm512_loadu_ps((const float*)bias_data);
-        }
-
-        int i = 0;
-        for (; i < elemcount; i++)
-        {
-            __m512 _v = _mm512_cvtepi32_ps(_mm512_loadu_si512((const __m512i*)intptr));
-            _v = _mm512_fmadd_ps(_v, _scale_in, _bias);
-            _v = activation_avx512(_v, activation_type, activation_params);
-            _v = _mm512_mul_ps(_v, _scale_out);
-            __m128i v = float2int8_avx512(_v);
-            _mm_storel_pd((double*)ptr0, _mm_castsi128_pd(v));
-            _mm_storeh_pd((double*)ptr1, _mm_castsi128_pd(v));
-            intptr += 16;
-            ptr0 += 8;
-            ptr1 += 8;
-        }
-    }
-}
-#endif // __AVX512F__
-
 #if !__AVX__
 static void requantize_pack4to8(const int* intptr0, const int* intptr1, signed char* ptr, const Mat& scale_in_data, const Mat& bias_data, const Mat& scale_out_data, int activation_type, const Mat& activation_params, int elemcount)
 {
@@ -468,76 +404,6 @@ static void requantize_pack4to8(const int* intptr0, const int* intptr1, signed c
     }
 }
 #endif // !__AVX__
-
-static void requantize_pack4to1(const int* intptr, signed char* ptr0, signed char* ptr1, signed char* ptr2, signed char* ptr3, const Mat& scale_in_data, const Mat& bias_data, const Mat& scale_out_data, int activation_type, const Mat& activation_params, int elemcount)
-{
-    const int scale_in_data_size = scale_in_data.w;
-    const int bias_data_size = bias_data.w;
-    const int scale_out_data_size = scale_out_data.w;
-
-    // NCNN_LOGE("requantize_pack4to1 %d %d %d   %d", scale_in_data_size, bias_data_size, scale_out_data_size, elemcount);
-
-    __m128 _scale_in = _mm_set1_ps(scale_in_data[0]);
-    if (scale_in_data_size > 1)
-    {
-        _scale_in = _mm_loadu_ps((const float*)scale_in_data);
-    }
-
-    __m128 _scale_out = _mm_set1_ps(scale_out_data[0]);
-    if (scale_out_data_size > 1)
-    {
-        _scale_out = _mm_loadu_ps((const float*)scale_out_data);
-    }
-
-    if (bias_data_size == 0)
-    {
-        int i = 0;
-        for (; i < elemcount; i++)
-        {
-            __m128 _v = _mm_cvtepi32_ps(_mm_loadu_si128((const __m128i*)intptr));
-            _v = _mm_mul_ps(_v, _scale_in);
-            _v = activation_sse(_v, activation_type, activation_params);
-            _v = _mm_mul_ps(_v, _scale_out);
-            int32_t v = float2int8_sse(_v);
-            ptr0[0] = (v >> 0) & 0xff;
-            ptr1[0] = (v >> 8) & 0xff;
-            ptr2[0] = (v >> 16) & 0xff;
-            ptr3[0] = (v >> 24) & 0xff;
-            intptr += 4;
-            ptr0 += 1;
-            ptr1 += 1;
-            ptr2 += 1;
-            ptr3 += 1;
-        }
-    }
-    else
-    {
-        __m128 _bias = _mm_set1_ps(bias_data[0]);
-        if (bias_data_size > 1)
-        {
-            _bias = _mm_loadu_ps((const float*)bias_data);
-        }
-
-        int i = 0;
-        for (; i < elemcount; i++)
-        {
-            __m128 _v = _mm_cvtepi32_ps(_mm_loadu_si128((const __m128i*)intptr));
-            _v = _mm_comp_fmadd_ps(_v, _scale_in, _bias);
-            _v = activation_sse(_v, activation_type, activation_params);
-            _v = _mm_mul_ps(_v, _scale_out);
-            int32_t v = float2int8_sse(_v);
-            ptr0[0] = (v >> 0) & 0xff;
-            ptr1[0] = (v >> 8) & 0xff;
-            ptr2[0] = (v >> 16) & 0xff;
-            ptr3[0] = (v >> 24) & 0xff;
-            intptr += 4;
-            ptr0 += 1;
-            ptr1 += 1;
-            ptr2 += 1;
-            ptr3 += 1;
-        }
-    }
-}
 #endif // __SSE2__
 
 int Requantize_x86::forward(const Mat& bottom_blob, Mat& top_blob, const Option& opt) const
@@ -602,24 +468,6 @@ int Requantize_x86::forward(const Mat& bottom_blob, Mat& top_blob, const Option&
             return -100;
 
 #if __SSE2__
-#if __AVX512F__
-        if (elempack == 16 && out_elempack == 8)
-        {
-            #pragma omp parallel for num_threads(opt.num_threads)
-            for (int i = 0; i < h; i++)
-            {
-                const int* intptr = bottom_blob.row<const int>(i);
-                signed char* ptr0 = top_blob.row<signed char>(i * 2);
-                signed char* ptr1 = top_blob.row<signed char>(i * 2 + 1);
-
-                const Mat scale_in_data_i = scale_in_data_size > 1 ? scale_in_data.range(i * elempack, elempack) : scale_in_data;
-                const Mat bias_data_i = bias_data_size > 1 ? bias_data.range(i * elempack, elempack) : bias_data;
-                const Mat scale_out_data_i = scale_out_data_size > 1 ? scale_out_data.range(i * elempack, elempack) : scale_out_data;
-
-                requantize_pack16to8(intptr, ptr0, ptr1, scale_in_data_i, bias_data_i, scale_out_data_i, activation_type, activation_params, w);
-            }
-        }
-#endif // __AVX512F__
 #if !__AVX__
         if (elempack == 4 && out_elempack == 8)
         {
@@ -638,24 +486,6 @@ int Requantize_x86::forward(const Mat& bottom_blob, Mat& top_blob, const Option&
             }
         }
 #endif // !__AVX__
-        if (elempack == 4 && out_elempack == 1)
-        {
-            #pragma omp parallel for num_threads(opt.num_threads)
-            for (int i = 0; i < h; i++)
-            {
-                const int* intptr = bottom_blob.row<const int>(i);
-                signed char* ptr0 = top_blob.row<signed char>(i * 4);
-                signed char* ptr1 = top_blob.row<signed char>(i * 4 + 1);
-                signed char* ptr2 = top_blob.row<signed char>(i * 4 + 2);
-                signed char* ptr3 = top_blob.row<signed char>(i * 4 + 3);
-
-                const Mat scale_in_data_i = scale_in_data_size > 1 ? scale_in_data.range(i * elempack, elempack) : scale_in_data;
-                const Mat bias_data_i = bias_data_size > 1 ? bias_data.range(i * elempack, elempack) : bias_data;
-                const Mat scale_out_data_i = scale_out_data_size > 1 ? scale_out_data.range(i * elempack, elempack) : scale_out_data;
-
-                requantize_pack4to1(intptr, ptr0, ptr1, ptr2, ptr3, scale_in_data_i, bias_data_i, scale_out_data_i, activation_type, activation_params, w);
-            }
-        }
 #endif // __SSE2__
         if (elempack == out_elempack)
         {
@@ -691,24 +521,6 @@ int Requantize_x86::forward(const Mat& bottom_blob, Mat& top_blob, const Option&
             return -100;
 
 #if __SSE2__
-#if __AVX512F__
-        if (elempack == 16 && out_elempack == 8)
-        {
-            #pragma omp parallel for num_threads(opt.num_threads)
-            for (int q = 0; q < channels; q++)
-            {
-                const int* intptr = bottom_blob.channel(q);
-                signed char* ptr0 = top_blob.channel(q * 2);
-                signed char* ptr1 = top_blob.channel(q * 2 + 1);
-
-                const Mat scale_in_data_q = scale_in_data_size > 1 ? scale_in_data.range(q * elempack, elempack) : scale_in_data;
-                const Mat bias_data_q = bias_data_size > 1 ? bias_data.range(q * elempack, elempack) : bias_data;
-                const Mat scale_out_data_q = scale_out_data_size > 1 ? scale_out_data.range(q * elempack, elempack) : scale_out_data;
-
-                requantize_pack16to8(intptr, ptr0, ptr1, scale_in_data_q, bias_data_q, scale_out_data_q, activation_type, activation_params, w * h);
-            }
-        }
-#endif // __AVX512F__
 #if !__AVX__
         if (elempack == 4 && out_elempack == 8)
         {
@@ -727,24 +539,6 @@ int Requantize_x86::forward(const Mat& bottom_blob, Mat& top_blob, const Option&
             }
         }
 #endif // !__AVX__
-        if (elempack == 4 && out_elempack == 1)
-        {
-            #pragma omp parallel for num_threads(opt.num_threads)
-            for (int q = 0; q < channels; q++)
-            {
-                const int* intptr = bottom_blob.channel(q);
-                signed char* ptr0 = top_blob.channel(q * 4);
-                signed char* ptr1 = top_blob.channel(q * 4 + 1);
-                signed char* ptr2 = top_blob.channel(q * 4 + 2);
-                signed char* ptr3 = top_blob.channel(q * 4 + 3);
-
-                const Mat scale_in_data_q = scale_in_data_size > 1 ? scale_in_data.range(q * elempack, elempack) : scale_in_data;
-                const Mat bias_data_q = bias_data_size > 1 ? bias_data.range(q * elempack, elempack) : bias_data;
-                const Mat scale_out_data_q = scale_out_data_size > 1 ? scale_out_data.range(q * elempack, elempack) : scale_out_data;
-
-                requantize_pack4to1(intptr, ptr0, ptr1, ptr2, ptr3, scale_in_data_q, bias_data_q, scale_out_data_q, activation_type, activation_params, w * h);
-            }
-        }
 #endif // __SSE2__
         if (elempack == out_elempack)
         {