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/*
* Copyright (C) 2007-2009 David Robillard <d@drobilla.net>
* Copyright (C) 2007-2015 Paul Davis <paul@linuxaudiosystems.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <xmmintrin.h>
#include "ardour/types.h"
void
x86_sse_find_peaks(const ARDOUR::Sample* buf, ARDOUR::pframes_t nframes, float *min, float *max)
{
__m128 current_max, current_min, work;
// Load max and min values into all four slots of the XMM registers
current_min = _mm_set1_ps(*min);
current_max = _mm_set1_ps(*max);
// Work input until "buf" reaches 16 byte alignment
while ( ((intptr_t)buf) % 16 != 0 && nframes > 0) {
// Load the next float into the work buffer
work = _mm_set1_ps(*buf);
current_min = _mm_min_ps(current_min, work);
current_max = _mm_max_ps(current_max, work);
buf++;
nframes--;
}
// use 64 byte prefetch for quadruple quads
while (nframes >= 16) {
#ifdef COMPILER_MSVC
_mm_prefetch(((char*)buf+64), 0); // A total guess! Assumed to be eqivalent to
#else // the line below but waiting to be tested !!
__builtin_prefetch(buf+64,0,0);
#endif
work = _mm_load_ps(buf);
current_min = _mm_min_ps(current_min, work);
current_max = _mm_max_ps(current_max, work);
buf+=4;
work = _mm_load_ps(buf);
current_min = _mm_min_ps(current_min, work);
current_max = _mm_max_ps(current_max, work);
buf+=4;
work = _mm_load_ps(buf);
current_min = _mm_min_ps(current_min, work);
current_max = _mm_max_ps(current_max, work);
buf+=4;
work = _mm_load_ps(buf);
current_min = _mm_min_ps(current_min, work);
current_max = _mm_max_ps(current_max, work);
buf+=4;
nframes-=16;
}
// work through aligned buffers
while (nframes >= 4) {
work = _mm_load_ps(buf);
current_min = _mm_min_ps(current_min, work);
current_max = _mm_max_ps(current_max, work);
buf+=4;
nframes-=4;
}
// work through the rest < 4 samples
while ( nframes > 0) {
// Load the next float into the work buffer
work = _mm_set1_ps(*buf);
current_min = _mm_min_ps(current_min, work);
current_max = _mm_max_ps(current_max, work);
buf++;
nframes--;
}
// Find min & max value in current_max through shuffle tricks
work = current_min;
work = _mm_shuffle_ps(work, work, _MM_SHUFFLE(2, 3, 0, 1));
work = _mm_min_ps (work, current_min);
current_min = work;
work = _mm_shuffle_ps(work, work, _MM_SHUFFLE(1, 0, 3, 2));
work = _mm_min_ps (work, current_min);
_mm_store_ss(min, work);
work = current_max;
work = _mm_shuffle_ps(work, work, _MM_SHUFFLE(2, 3, 0, 1));
work = _mm_max_ps (work, current_max);
current_max = work;
work = _mm_shuffle_ps(work, work, _MM_SHUFFLE(1, 0, 3, 2));
work = _mm_max_ps (work, current_max);
_mm_store_ss(max, work);
}
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