COMPMID-3160: Add Bfloat16 support in NEGEMMConvolutionLayer

Signed-off-by: Georgios Pinitas <georgios.pinitas@arm.com>
Change-Id: I0e449306c138a562ffc1455e76ec44b2fd059d85
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/2860
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Michele Di Giorgio <michele.digiorgio@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
diff --git a/src/core/NEON/kernels/arm_gemm/gemm_bf16.cpp b/src/core/NEON/kernels/arm_gemm/gemm_bf16.cpp
new file mode 100644
index 0000000..10fee47
--- /dev/null
+++ b/src/core/NEON/kernels/arm_gemm/gemm_bf16.cpp
@@ -0,0 +1,158 @@
+/*
+ * Copyright (c) 2017-2018 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 "arm_gemm.hpp"
+#include "gemm_common.hpp"
+#include "gemm_hybrid.hpp"
+#include "gemm_implementation.hpp"
+#include "gemm_interleaved.hpp"
+#include "gemm_native.hpp"
+#include "gemv_batched.hpp"
+#include "gemv_native_transposed.hpp"
+#include "gemv_pretransposed.hpp"
+
+#include "kernels/a64_interleaved_bf16fp32_dot_12x8.hpp"
+#include "kernels/a64_interleaved_bf16fp32_mmla_12x8.hpp"
+#include "kernels/a64_sgemm_12x8.hpp"
+#include "kernels/a32_sgemm_8x6.hpp"
+#include "kernels/sve_interleaved_bf16fp32_dot_3VLx8.hpp"
+#include "kernels/sve_interleaved_bf16fp32_mmla_3VLx8.hpp"
+#include "kernels/sve_native_bf16fp32_dot_4VLx4.hpp"
+#include "kernels/sve_hybrid_bf16fp32_dot_4VLx4.hpp"
+#include "kernels/sve_hybrid_bf16fp32_mmla_4VLx4.hpp"
+#include "kernels/sve_hybrid_bf16fp32_mmla_6VLx2.hpp"
+#include "kernels/sve_hybrid_bf16fp32_mmla_8VLx2.hpp"
+
+#include "bfloat.hpp"
+
+namespace arm_gemm {
+
+
+static const GemmImplementation<bfloat16, float> gemm_bf16_methods[] =
+{
+#ifdef V8P6_BF
+# ifdef __ARM_FEATURE_SVE
+{
+    GemmMethod::GEMM_HYBRID,
+    "hybrid_bf16fp32_mmla_6VLx2",
+    [](const GemmArgs &args) { return (args._Ksize>=8 && !args._trA && args._pretransposed_hint); },
+    [](const GemmArgs &args) { return ((args._Msize <= 4) && (args._Nsize <= hybrid_bf16fp32_mmla_6VLx2::out_width())); },
+    [](const GemmArgs &args) { return new GemmHybrid<hybrid_bf16fp32_mmla_6VLx2, bfloat16, float>(args); }
+},
+{
+    GemmMethod::GEMM_HYBRID,
+    "hybrid_bf16fp32_mmla_8VLx2",
+    [](const GemmArgs &args) { return (args._Ksize>=8 && !args._trA && args._pretransposed_hint); },
+    [](const GemmArgs &args) { return (args._Msize <= 4); },
+    [](const GemmArgs &args) { return new GemmHybrid<hybrid_bf16fp32_mmla_8VLx2, bfloat16, float>(args); }
+},
+{
+    GemmMethod::GEMM_HYBRID,
+    "hybrid_bf16fp32_mmla_4VLx4",
+    [](const GemmArgs &args) { return (args._Ksize>=8 && !args._trA && args._pretransposed_hint); },
+    [](const GemmArgs &args) { return ((args._Ksize <= 128) && (args._Nsize <= 128)); },
+    [](const GemmArgs &args) { return new GemmHybrid<hybrid_bf16fp32_mmla_4VLx4, bfloat16, float>(args); }
+},
+{
+    GemmMethod::GEMM_HYBRID,
+    "hybrid_bf16fp32_dot_4VLx4",
+    [](const GemmArgs &args) { return (args._Ksize>=8 && !args._trA && args._pretransposed_hint); },
+    [](const GemmArgs &args) { return ((args._Ksize <= 128) && (args._Nsize <= 128)); },
+    [](const GemmArgs &args) { return new GemmHybrid<hybrid_bf16fp32_dot_4VLx4, bfloat16, float>(args); }
+},
+{ // gemm_bf16_native
+    GemmMethod::GEMM_NATIVE,
+    "native_bf16fp32_dot_4VLx4",
+    [](const GemmArgs &args) { return (args._Ksize>=8 && !args._trA && !args._trB); },
+    [](const GemmArgs &args) { return ((args._Ksize <= 128) && (args._Nsize <= 128)); },
+    [](const GemmArgs &args) { return new GemmNative<native_bf16fp32_dot_4VLx4, bfloat16, float>(args); }
+},
+{ // gemm_bf16_interleaved
+    GemmMethod::GEMM_INTERLEAVED,
+    "interleaved_bf16fp32_mmla_3VLx8",
+    [](const GemmArgs &args) { return (args._Ksize>4); },
+    nullptr,
+    [](const GemmArgs &args) { return new GemmInterleaved<interleaved_bf16fp32_mmla_3VLx8, bfloat16, float>(args); }
+},
+{ // gemm_bf16_interleaved
+    GemmMethod::GEMM_INTERLEAVED,
+    "interleaved_bf16fp32_dot_3VLx8",
+    [](const GemmArgs &args) { return (args._Ksize>2); },
+    nullptr,
+    [](const GemmArgs &args) { return new GemmInterleaved<interleaved_bf16fp32_dot_3VLx8, bfloat16, float>(args); }
+},
+# endif // SVE
+{ // gemm_bf16_interleaved
+    GemmMethod::GEMM_INTERLEAVED,
+    "interleaved_bf16fp32_mmla_12x8",
+    [](const GemmArgs &args) { return (args._Ksize>4); },
+    nullptr,
+    [](const GemmArgs &args) { return new GemmInterleaved<interleaved_bf16fp32_mmla_12x8, bfloat16, float>(args); }
+},
+{ // gemm_bf16_interleaved
+    GemmMethod::GEMM_INTERLEAVED,
+    "interleaved_bf16fp32_dot_12x8",
+    [](const GemmArgs &args) { return (args._Ksize>2); },
+    nullptr,
+    [](const GemmArgs &args) { return new GemmInterleaved<interleaved_bf16fp32_dot_12x8, bfloat16, float>(args); }
+},
+#endif // V8P6_BF
+#ifdef __aarch64__
+{
+    GemmMethod::GEMM_INTERLEAVED,
+    "sgemm_12x8",
+    nullptr,
+    nullptr,
+    [](const GemmArgs &args) { return new GemmInterleaved<sgemm_12x8, bfloat16, float>(args); }
+},
+#elif defined(__arm__)
+{
+    GemmMethod::GEMM_INTERLEAVED,
+    "sgemm_8x6",
+    nullptr,
+    nullptr,
+    [](const GemmArgs &args) { return new GemmInterleaved<sgemm_8x6, bfloat16, float>(args); }
+},
+#else
+# error "Unknown Architecture"
+#endif
+{
+    GemmMethod::DEFAULT,
+    "",
+    nullptr,
+    nullptr,
+    nullptr
+}
+};
+
+template<>
+const GemmImplementation<bfloat16, float> *gemm_implementation_list<bfloat16, float>() {
+    return gemm_bf16_methods;
+}
+
+/* Explicitly instantiate the external functions for these types. */
+template UniqueGemmCommon<bfloat16, float> gemm<bfloat16, float, Nothing>(const GemmArgs &args, const Nothing &);
+template KernelDescription get_gemm_method<bfloat16, float, Nothing>(const GemmArgs &args, const Nothing &);
+template std::vector<KernelDescription> get_compatible_kernels<bfloat16, float, Nothing>(const GemmArgs &args, const Nothing &);
+
+} // namespace arm_gemm