diff --git a/include/utils/utils.h b/include/utils/utils.h
index a8bd2919..0803c791 100644
--- a/include/utils/utils.h
+++ b/include/utils/utils.h
@@ -21,6 +21,12 @@
 
 #ifdef __AVX__
 #include "immintrin.h"
+#ifdef __GNUC__
+#if __GNUC__ < 8
+#define _mm256_set_m128i(/* __m128i */ hi, /* __m128i */ lo) \
+    _mm256_insertf128_si256(_mm256_castsi128_si256(lo), (hi), 0x1)
+#endif
+#endif
 #endif
 
 namespace fastllm {
diff --git a/src/devices/cpu/cpudevice.cpp b/src/devices/cpu/cpudevice.cpp
index 7e8d6f6a..e03e103d 100644
--- a/src/devices/cpu/cpudevice.cpp
+++ b/src/devices/cpu/cpudevice.cpp
@@ -79,7 +79,7 @@ namespace fastllm {
         return true;
     }
 
-#ifdef __AVX__
+
 #ifdef __AVX2__
     int DotU8U8(uint8_t *a, uint8_t *b, int n) {
         __m256i acc = _mm256_setzero_si256();
@@ -107,32 +107,31 @@ namespace fastllm {
 
         return ans + I32sum(acc);
     };
-#else
-    int DotU8U8(uint8_t *a, uint8_t *b, int n) {
-        __m256i acc = _mm256_setzero_si256();
-
-        int i = 0;
-        int ans = 0;
-        for (; i + 31 < n; i += 32) {
-            __m256i bx = _mm256_loadu_si256((const __m256i *) (a + i));
-            __m256i by = _mm256_loadu_si256((const __m256i *) (b + i));
-
-            __m256i mx0 = _mm256_cvtepu8_epi16(_mm256_extractf128_si256(bx, 0));
-            __m256i mx1 = _mm256_cvtepu8_epi16(_mm256_extractf128_si256(bx, 1));
-
-            __m256i my0 = _mm256_cvtepu8_epi16(_mm256_extractf128_si256(by, 0));
-            __m256i my1 = _mm256_cvtepu8_epi16(_mm256_extractf128_si256(by, 1));
-
-            acc = _mm256_add_epi32(acc, _mm256_madd_epi16(mx0, my0));
-            acc = _mm256_add_epi32(acc, _mm256_madd_epi16(mx1, my1));
-        }
-        for (; i < n; i++) {
-            ans += a[i] * b[i];
-        }
-
-        return ans + I32sum(acc);
-    };
-#endif
+//#else
+//    int DotU8U8(uint8_t *a, uint8_t *b, int n) {
+//        __m256i acc = _mm256_setzero_si256();
+
+//        int i = 0;
+//        int ans = 0;
+//        for (; i + 31 < n; i += 32) {
+//            __m256i bx = _mm256_loadu_si256((const __m256i *) (a + i));
+//            __m256i by = _mm256_loadu_si256((const __m256i *) (b + i));
+
+//            __m256i mx0 = _mm256_cvtepu8_epi16(_mm256_extractf128_si256(bx, 0));
+//            __m256i mx1 = _mm256_cvtepu8_epi16(_mm256_extractf128_si256(bx, 1));
+
+//            __m256i my0 = _mm256_cvtepu8_epi16(_mm256_extractf128_si256(by, 0));
+//            __m256i my1 = _mm256_cvtepu8_epi16(_mm256_extractf128_si256(by, 1));
+
+//            acc = _mm256_add_epi32(acc, _mm256_madd_epi16(mx0, my0));
+//            //acc = _mm256_add_epi32(acc, _mm256_madd_epi16(mx1, my1));
+//        }
+//        for (; i < n; i++) {
+//            ans += a[i] * b[i];
+//        }
+
+//        return ans + I32sum(acc);
+//    };
     int DotU4U8(uint8_t *a, uint8_t *b, int n) {
         __m256i acc = _mm256_setzero_si256();
 
@@ -920,7 +919,7 @@ namespace fastllm {
                 c[block * kstride + i] = value;
             }
         }
-#elif defined(__AVX__)
+#elif defined(__AVX2__)
         int block = 0;
         for (; block < n; block++) {
             uint8_t *weightWalk = b;
@@ -994,7 +993,7 @@ namespace fastllm {
                     sum0 = vpadalq_u16(sum0, vmull_u8(vb, in.val[0]));
                 }
                 value += sum0[0] + sum0[1] + sum0[2] + sum0[3];
-#elif defined(__AVX__)
+#elif defined(__AVX2__)
                 value += DotU4U8(weightWalk + i * m / 2, inputWalk, m);
                 j += m;
 #endif
@@ -1065,7 +1064,7 @@ namespace fastllm {
                     sum0 = vpadalq_u16(sum0, vmull_u8(vb, in.val[0]));
                 }
                 value += sum0[0] + sum0[1] + sum0[2] + sum0[3];
-#elif defined(__AVX__)
+#elif defined(__AVX2__)
                 value += DotU4U8(weightWalk + i * m / 2, inputWalk, m);
                 j += m;
 #endif
diff --git a/src/fastllm.cpp b/src/fastllm.cpp
index 9a8421c3..f9c97f0b 100644
--- a/src/fastllm.cpp
+++ b/src/fastllm.cpp
@@ -562,7 +562,7 @@ namespace fastllm {
             weightSum.resize(n);
             for (int i = 0; i < n; i++) {
                 int j = 0;
-#ifdef __AVX__
+#ifdef __AVX2__
                 __m256i acc = _mm256_setzero_si256();
                 const __m256i ones = _mm256_set1_epi16(1);
                 for (; j + 31 < m; j += 32) {
@@ -608,7 +608,7 @@ namespace fastllm {
                 }
                 weightSum[i] += sum0[0] + sum0[1] + sum0[2] + sum0[3];
 #endif
-#ifdef __AVX__
+#ifdef __AVX2__
 	            __m256i acc = _mm256_setzero_si256();
 	            const __m256i lowMask = _mm256_set1_epi8(0xf);
 	            const __m256i ones = _mm256_set1_epi16(1);