Using dp4a ptx intrinsics for an improved Mul8MAT perf [By Alcpz]

ggml/src/ggml-sycl/dpct/helper.hpp

@@ -1834,6 +1834,20 @@ namespace dpct
     template <typename T1, typename T2, typename T3>
     inline auto dp4a(T1 a, T2 b, T3 c)
     {
+#if defined(__SYCL_DEVICE_ONLY__) && defined(__NVPTX__) &&                     \
+    defined(__SYCL_CUDA_ARCH__) && __SYCL_CUDA_ARCH__ >= 610
+        dot_product_acc_t<T1, T2> res;
+        if constexpr (std::is_same_v<dot_product_acc_t<T1, T2>, uint32_t>) {
+            asm volatile("dp4a.u32.u32 %0, %1, %2, %3;"
+                         : "=r"(res)
+                         : "r"(a), "r"(b), "r"(c));
+        } else {
+            asm volatile("dp4a.s32.s32 %0, %1, %2, %3;"
+                         : "=r"(res)
+                         : "r"(a), "r"(b), "r"(c));
+        }
+        return res;
+#else
         dot_product_acc_t<T1, T2> res = c;
         auto va = extract_and_sign_or_zero_extend4(a);
         auto vb = extract_and_sign_or_zero_extend4(b);
@@ -1842,6 +1856,7 @@ namespace dpct
         res += va[2] * vb[2];
         res += va[3] * vb[3];
         return res;
+#endif
     }
 
     struct sub_sat