distance_sse.h
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright 2012 The MITRE Corporation *
* *
* 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. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#ifndef DISTANCE_SSE_H
#define DISTANCE_SSE_H
#include <QDebug>
#ifdef __SSE__
#include <xmmintrin.h>
inline QDebug operator<<(QDebug dbg, const __m128i &p)
{
uchar *up = (uchar*)&p;
dbg.nospace() << up[0] << "," << up[1] << "," << up[2] << "," << up[3] << "," << up[4] << "," << up[5] << "," << up[6] << "," << up[7] << ","
<< up[8] << "," << up[9] << "," << up[10] << "," << up[11] << "," << up[12] << "," << up[13] << "," << up[14] << "," << up[15];
return dbg.space();
}
inline float l1(const uchar *a, const uchar *b, int size)
{
size = size / sizeof(__m128i);
__m128i accumulate = _mm_setzero_si128();
for (int i=0; i<size; i++) {
__m128i A = _mm_loadu_si128(reinterpret_cast<const __m128i*>(a)+i);
__m128i B = _mm_loadu_si128(reinterpret_cast<const __m128i*>(b)+i);
__m128i sad = _mm_sad_epu8(A, B);
accumulate = _mm_add_epi64(sad, accumulate);
}
int64_t buff[2];
_mm_storeu_si128(reinterpret_cast<__m128i*>(&buff), accumulate);
return buff[0] + buff[1];
}
#else
inline float l1(const uchar *a, const uchar *b, int size)
{
int distance = 0;
for (int i=0; i<size; i++)
distance += abs(a[i]-b[i]);
return distance;
}
#endif
inline float packed_l1(const uchar *a, const uchar *b, int size)
{
static const uchar low_mask = 0x0F;
static const uchar hi_mask = 0xF0;
int distance = 0;
for (int i=0; i<size; i++)
distance += (abs((a[i] & low_mask) - (b[i] & low_mask)) >> 0) +
(abs((a[i] & hi_mask) - (b[i] & hi_mask)) >> 4);
return distance;
}
#endif // DISTANCE_SSE_H