1 files changed, 50 insertions, 0 deletions
diff --git a/third_party/highway/hwy/per_target.cc b/third_party/highway/hwy/per_target.cc
new file mode 100644
index 0000000000..4cbf152328
--- /dev/null
+++ b/third_party/highway/hwy/per_target.cc
@@ -0,0 +1,50 @@
+// Copyright 2022 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "hwy/per_target.h"
+
+#undef HWY_TARGET_INCLUDE
+#define HWY_TARGET_INCLUDE "hwy/per_target.cc"
+#include "hwy/foreach_target.h"  // IWYU pragma: keep
+#include "hwy/highway.h"
+
+HWY_BEFORE_NAMESPACE();
+namespace hwy {
+namespace HWY_NAMESPACE {
+// On SVE, Lanes rounds down to a power of two, but we want to know the actual
+// size here. Otherwise, hypothetical SVE with 48 bytes would round down to 32
+// and we'd enable HWY_SVE_256, and then fail reverse_test because Reverse on
+// HWY_SVE_256 requires the actual vector to be a power of two.
+#if HWY_TARGET == HWY_SVE || HWY_TARGET == HWY_SVE2 || HWY_TARGET == HWY_SVE_256
+size_t GetVectorBytes() { return detail::AllHardwareLanes(hwy::SizeTag<1>()); }
+#else
+size_t GetVectorBytes() { return Lanes(ScalableTag<uint8_t>()); }
+#endif
+// NOLINTNEXTLINE(google-readability-namespace-comments)
+}  // namespace HWY_NAMESPACE
+
+}  // namespace hwy
+HWY_AFTER_NAMESPACE();
+
+#if HWY_ONCE
+namespace hwy {
+namespace {
+HWY_EXPORT(GetVectorBytes);  // Local function.
+}  // namespace
+
+size_t VectorBytes() { return HWY_DYNAMIC_DISPATCH(GetVectorBytes)(); }
+
+}  // namespace hwy
+#endif  // HWY_ONCE