Support int8 for innerproduct

include/ck/utility/inner_product.hpp

@@ -135,6 +135,28 @@ __device__ void inner_product<half8_t, half8_t, float>(const half8_t& a, const h
                   c);
 }
 
+template <>
+__device__ void inner_product<int8_t, int8_t, int32_t>(const int8_t& a, const int8_t& b, int32_t& c)
+{
+    c += type_convert<int32_t>(a) * type_convert<int32_t>(b);
+}
+
+template <>
+__device__ void
+inner_product<int8x2_t, int8x2_t, int32_t>(const int8x2_t& a, const int8x2_t& b, int32_t& c)
+{
+    constexpr auto I0 = Number<0>{};
+    constexpr auto I1 = Number<1>{};
+
+    inner_product(vector_type<int8_t, 2>{a}.AsType<int8_t>()[I0],
+                  vector_type<int8_t, 2>{b}.AsType<int8_t>()[I0],
+                  c);
+
+    inner_product(vector_type<int8_t, 2>{a}.AsType<int8_t>()[I1],
+                  vector_type<int8_t, 2>{b}.AsType<int8_t>()[I1],
+                  c);
+}
+
 template <>
 __device__ void
 inner_product<int8x4_t, int8x4_t, int32_t>(const int8x4_t& a, const int8x4_t& b, int32_t& c)