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+/*
+ * Copyright (c) 2018 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "gemv_batched.hpp"
+
+namespace arm_gemm {
+
+template<typename Top, typename Tret>
+class GemmImplementation {
+public:
+ /* Is this implementation compatible with the args as provided? */
+ virtual bool is_supported(const GemmArgs<Tret> &args) { return true; }
+ /* Is this implementation "recommended" for these args (heuristic)? */
+ virtual bool is_recommended(const GemmArgs<Tret> &args) { return true; }
+ /* Instantiate this method please. */
+ virtual UniqueGemmCommon<Top, Tret> instantiate(const GemmArgs<Tret> &args) = 0;
+
+ /* Indicate the "GemmMethod" for use as a selector */
+ const GemmMethod method;
+
+ virtual ~GemmImplementation() { }
+
+ GemmImplementation(GemmMethod method) : method(method) { }
+};
+
+/* "gemv_batched" implementation is type-agnostic, so template it here. */
+template<typename Top, typename Tret>
+class GemmImpl_gemv_batched : public GemmImplementation<Top, Tret> {
+public:
+ bool is_supported(const GemmArgs<Tret> &args) override {
+ return (args._Msize==1 && args._nbatches > 1);
+ }
+
+ UniqueGemmCommon<Top, Tret> instantiate(const GemmArgs<Tret> &args) override {
+ return UniqueGemmCommon<Top, Tret> (new GemvBatched<Top, Tret>(args));
+ }
+
+ GemmImpl_gemv_batched() : GemmImplementation<Top, Tret>(GemmMethod::GEMV_BATCHED) { }
+};
+
+/* "Master" function implemented for each valid combination of types.
+ * Returns a list of GEMM implementation descriptors for processing by the
+ * other functions. */
+template<typename Top, typename Tret>
+std::vector<GemmImplementation<Top, Tret> *> &gemm_implementation_list();
+
+template<typename Top, typename Tret>
+GemmImplementation<Top, Tret> *find_implementation(GemmArgs<Tret> &args, GemmConfig *cfg) {
+ auto gemms = gemm_implementation_list<Top, Tret>();
+
+ for(auto &&i : gemms) {
+ /* Skip if this implementation doesn't support these args. */
+ if (!i->is_supported(args)) {
+ continue;
+ }
+
+ /* Skip if a specific method is requested and this is a different one. */
+ if (cfg && cfg->method != GemmMethod::DEFAULT && i->method != cfg->method) {
+ continue;
+ }
+
+ /* If no specific method is requested, check that this method recommends itself. */
+ if ((!cfg || cfg->method == GemmMethod::DEFAULT) && !i->is_recommended(args)) {
+ continue;
+ }
+
+ return i;
+ }
+
+ return nullptr;
+}
+
+template<typename Top, typename Tret>
+UniqueGemmCommon<Top, Tret> gemm(GemmArgs<Tret> &args, GemmConfig *cfg) {
+ auto impl = find_implementation<Top, Tret>(args, cfg);
+
+ if (impl) {
+ return impl->instantiate(args);
+ }
+
+ return UniqueGemmCommon<Top, Tret>(nullptr);
+}
+
+template<typename Top, typename Tret>
+GemmMethod get_gemm_method(GemmArgs<Tret> &args) {
+ auto impl = find_implementation<Top, Tret>(args, nullptr);
+
+ if (impl) {
+ return impl->method;
+ }
+
+ /* This shouldn't happen - there should always be at least one valid implementation. */
+ return GemmMethod::DEFAULT;
+}
+
+template<typename Top, typename Tret>
+bool method_is_compatible(GemmMethod method, GemmArgs<Tret> &args) {
+ /* Determine if the method is valid by attempting to obtain an implementation specifying this method. */
+ GemmConfig cfg(method);
+
+ auto impl = find_implementation<Top, Tret>(args, &cfg);
+
+ if (impl) {
+ return true;
+ }
+
+ return false;
+}
+
+} // namespace arm_gemm