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diff --git a/runtimes/nn/depend/external/gemmlowp/public/bit_depth.h b/runtimes/nn/depend/external/gemmlowp/public/bit_depth.h
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+// Copyright 2015 The Gemmlowp Authors. All Rights Reserved.
+//
+// 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.
+
+// bit_depth.h: defines the settins controlling LHS/RHS bit depth
+
+#ifndef GEMMLOWP_PUBLIC_BIT_DEPTH_H_
+#define GEMMLOWP_PUBLIC_BIT_DEPTH_H_
+
+namespace gemmlowp {
+
+// The range of allowed values for an operand.
+template <int tMinValue, int tMaxValue>
+struct OperandRange {
+  static const int kMinValue = tMinValue;
+  static const int kMaxValue = tMaxValue;
+  static_assert(0 <= kMinValue, "");
+  static_assert(kMinValue < kMaxValue, "");
+  static_assert(kMaxValue <= 255, "");
+};
+
+using Uint8Range = OperandRange<0, 255>;
+using Uint8RangeExcludingZero = OperandRange<1, 255>;
+
+template <typename tLhsRange, typename tRhsRange>
+struct BitDepthParams {
+  using LhsRange = tLhsRange;
+  using RhsRange = tRhsRange;
+};
+
+// Default: LHS and RHS are 8bit.
+using DefaultL8R8BitDepthParams = BitDepthParams<Uint8Range, Uint8Range>;
+
+// Variant: LHS may not take the value 0. This allows using
+// faster kernels using signed arithmetic, see
+// NEON_64bit_GEMM_Int8Operands_Int32Accumulators_AccumTwoWithin16Bits
+using L8R8WithLhsNonzeroBitDepthParams =
+    BitDepthParams<Uint8RangeExcludingZero, Uint8Range>;
+
+// Deprecated: when gemmlowp used to allow requantizing 8bit
+// inputs to less-than-8-bit depths, the public setting allowing
+// that was DefaultL7R5BitDepthParams. That requantization
+// feature has been removed, but as the whole point of that
+// requantization was to make less-than-8-bit an internal
+// optimization without any impact on the API (other than lowering
+// accuracy), we can temporarily support users who were using it
+// by mapping it to the default 8bit behavior.
+using DefaultL7R5BitDepthParams = DefaultL8R8BitDepthParams;
+
+}  // namespace gemmlowp
+
+#endif  // GEMMLOWP_PUBLIC_BIT_DEPTH_H_