From d621bca4e963555a99be4328c8d49d1813789649 Mon Sep 17 00:00:00 2001 From: Chunosov Date: Fri, 3 Nov 2017 17:33:15 +0700 Subject: COMPMID-661: directconv-uint8 (#20) Change-Id: I84f7a1ce3658be0d3c91e65096467258af48f0b6 Reviewed-on: http://mpd-gerrit.cambridge.arm.com/94341 Tested-by: Kaizen Reviewed-by: Anthony Barbier --- src/core/utils/quantization/AsymmHelpers.cpp | 60 ++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) create mode 100644 src/core/utils/quantization/AsymmHelpers.cpp (limited to 'src/core/utils/quantization') diff --git a/src/core/utils/quantization/AsymmHelpers.cpp b/src/core/utils/quantization/AsymmHelpers.cpp new file mode 100644 index 0000000000..4ba5f44efa --- /dev/null +++ b/src/core/utils/quantization/AsymmHelpers.cpp @@ -0,0 +1,60 @@ +/* + * Copyright (c) 2017 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_compute/core/utils/quantization/AsymmHelpers.h" + +#include +#include +#include + +using namespace arm_compute::quantization; + +arm_compute::Error arm_compute::quantization::calculate_quantized_multiplier_less_than_one(double multiplier, + int *quant_multiplier, + int *right_shift) +{ + ARM_COMPUTE_RETURN_ERROR_ON(quant_multiplier == nullptr); + ARM_COMPUTE_RETURN_ERROR_ON(right_shift == nullptr); + ARM_COMPUTE_RETURN_ERROR_ON(multiplier < 0); + ARM_COMPUTE_RETURN_ERROR_ON(multiplier >= 1); + if(multiplier == 0) + { + *quant_multiplier = 0; + *right_shift = 0; + return arm_compute::Error{}; + } + const double q = std::frexp(multiplier, right_shift); + *right_shift *= -1; + auto q_fixed = static_cast(round(q * (1ll << 31))); + ARM_COMPUTE_RETURN_ERROR_ON(q_fixed > (1ll << 31)); + if(q_fixed == (1ll << 31)) + { + q_fixed /= 2; + --*right_shift; + } + ARM_COMPUTE_RETURN_ERROR_ON(*right_shift < 0); + ARM_COMPUTE_RETURN_ERROR_ON(q_fixed > std::numeric_limits::max()); + *quant_multiplier = static_cast(q_fixed); + + return arm_compute::Error{}; +} \ No newline at end of file -- cgit v1.2.1