Pull ARM's matrix transpose PR

Summary:
X-link: facebookresearch/FBGEMM#736

Bring ARM's PR: #3510

Differential Revision: D67396309

defs.bzl

@@ -1,4 +1,5 @@
 # Copyright (c) Meta Platforms, Inc. and affiliates.
+# Copyright 2024 Arm Limited and/or its affiliates <[email protected]>
 # All rights reserved.
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -180,6 +181,19 @@ def get_fbgemm_inline_sve_srcs(msvc = False, buck = False):
         })
     return asm_srcs if not msvc else intrinsics_srcs
 
+def get_fbgemm_inline_neon_srcs(msvc = False, buck = False):
+    intrinsics_srcs = ["src/UtilsNeon.cc"]
+
+    #FP16 kernels contain inline assembly and inline assembly syntax for MSVC is different.
+    asm_srcs = ["src/UtilsNeon.cc"]
+    if buck:
+        return select({
+            "DEFAULT": asm_srcs,
+            "ovr_config//compiler:cl": intrinsics_srcs,
+            "ovr_config//cpu:arm64": intrinsics_srcs,
+        })
+    return asm_srcs if not msvc else intrinsics_srcs
+
 def get_fbgemm_autovec_srcs():
     return [
         "src/EmbeddingSpMDMAutovec.cc",

src/TransposeUtils.cc

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) Meta Platforms, Inc. and affiliates.
+ * Copyright 2024 Arm Limited and/or its affiliates <[email protected]>
  * All rights reserved.
  *
  * This source code is licensed under the BSD-style license found in the
@@ -47,9 +48,9 @@ void transpose_simd(
     return;
   }
 
-#if HAVE_SVE
+#ifdef __aarch64__
   if constexpr (std::is_same<T, float>::value) {
-    internal::transpose_sve<T>(M, N, src, ld_src, dst, ld_dst);
+    internal::transpose_neon<T>(M, N, src, ld_src, dst, ld_dst);
   } else {
     transpose_ref<T>(M, N, src, ld_src, dst, ld_dst);
   }

src/TransposeUtils.h

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) Meta Platforms, Inc. and affiliates.
+ * Copyright 2024 Arm Limited and/or its affiliates <[email protected]>
  * All rights reserved.
  *
  * This source code is licensed under the BSD-style license found in the
@@ -64,9 +65,9 @@ void transpose_avx512(
 
 #ifdef __aarch64__
 /**
- * @brief Transpose a matrix using Intel AVX2.
+ * @brief Transpose a matrix using SVE.
  *
- * This is called if the code is running on a CPU with Intel AVX2 support.
+ * This is called if the code is running on a CPU with SVE support.
  */
 template <typename T>
 void transpose_sve(
@@ -76,6 +77,20 @@ void transpose_sve(
     int64_t ld_src,
     T* dst,
     int64_t ld_dst);
+
+/**
+ * @brief Transpose a matrix using NEON.
+ *
+ * This is called if the code is running on a CPU with NEON support.
+ */
+template <typename T>
+void transpose_neon(
+    int64_t M,
+    int64_t N,
+    const T* src,
+    int64_t ld_src,
+    T* dst,
+    int64_t ld_dst);
 #endif // __aarch64__
 
 } // namespace internal