60 lines
2.2 KiB
C++
60 lines
2.2 KiB
C++
// ======================================================================== //
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// Copyright 2009-2019 Intel Corporation //
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// //
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// Licensed under the Apache License, Version 2.0 (the "License"); //
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// you may not use this file except in compliance with the License. //
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// You may obtain a copy of the License at //
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// //
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// http://www.apache.org/licenses/LICENSE-2.0 //
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// //
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// Unless required by applicable law or agreed to in writing, software //
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// distributed under the License is distributed on an "AS IS" BASIS, //
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. //
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// See the License for the specific language governing permissions and //
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// limitations under the License. //
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// ======================================================================== //
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#pragma once
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#include "common/platform.h"
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namespace oidn {
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constexpr float minVectorLength = 1e-10f;
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constexpr float minVectorLengthSqr = minVectorLength * minVectorLength;
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using std::log2;
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using std::exp2;
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using std::pow;
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using std::isfinite;
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__forceinline float sqr(float x)
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{
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return x * x;
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}
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__forceinline float rcp(float x)
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{
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__m128 r = _mm_rcp_ss(_mm_set_ss(x));
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return _mm_cvtss_f32(_mm_sub_ss(_mm_add_ss(r, r), _mm_mul_ss(_mm_mul_ss(r, r), _mm_set_ss(x))));
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}
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__forceinline float rsqrt(float x)
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{
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__m128 r = _mm_rsqrt_ss(_mm_set_ss(x));
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return _mm_cvtss_f32(_mm_add_ss(_mm_mul_ss(_mm_set_ss(1.5f), r),
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_mm_mul_ss(_mm_mul_ss(_mm_mul_ss(_mm_set_ss(x), _mm_set_ss(-0.5f)), r), _mm_mul_ss(r, r))));
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}
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__forceinline float maxSafe(float value, float minValue)
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{
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return isfinite(value) ? max(value, minValue) : minValue;
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}
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__forceinline float clampSafe(float value, float minValue, float maxValue)
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{
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return isfinite(value) ? clamp(value, minValue, maxValue) : minValue;
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}
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} // namespace oidn
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