You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
69 lines
2.6 KiB
69 lines
2.6 KiB
// 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 constexpr int kMinValue = tMinValue;
|
|
static constexpr int kMaxValue = tMaxValue;
|
|
static_assert(kMinValue < kMaxValue, "");
|
|
};
|
|
|
|
using Uint8Range = OperandRange<0, 255>;
|
|
using Uint8RangeExcludingZero = OperandRange<1, 255>;
|
|
|
|
using Int8Range = OperandRange<-128, 127>;
|
|
using Int8RangeExcludingLow = OperandRange<-127, 127>;
|
|
|
|
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>;
|
|
|
|
// Signed Variant: This allows using faster kernels using signed arithmetic, see
|
|
// NEON_64bit_GEMM_Int8Operands_Int32Accumulators_AccumTwoWithin16Bits
|
|
using SignedL8R8WithLhsNonzeroBitDepthParams =
|
|
BitDepthParams<Int8RangeExcludingLow, Int8Range>;
|
|
|
|
// 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_
|