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/*
* Copyright © 2014 Timothy Arceri
*
* 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 (including the next
* paragraph) 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.
*
* Author:
* Timothy Arceri <t_arceri@yahoo.com.au>
*
*/
#ifdef __SSE4_1__
#include "main/sse_minmax.h"
#include <smmintrin.h>
#include <stdint.h>
void
_mesa_uint_array_min_max(const unsigned *ui_indices, unsigned *min_index,
unsigned *max_index, const unsigned count)
{
unsigned max_ui = 0;
unsigned min_ui = ~0U;
unsigned i = 0;
unsigned aligned_count = count;
/* handle the first few values without SSE until the pointer is aligned */
while (((uintptr_t)ui_indices & 15) && aligned_count) {
if (*ui_indices > max_ui)
max_ui = *ui_indices;
if (*ui_indices < min_ui)
min_ui = *ui_indices;
aligned_count--;
ui_indices++;
}
/* TODO: The actual threshold for SSE begin useful may be higher than 8.
* Some careful microbenchmarks and measurement are required to
* find the actual tipping point.
*/
if (aligned_count >= 8) {
unsigned max_arr[4] __attribute__ ((aligned (16)));
unsigned min_arr[4] __attribute__ ((aligned (16)));
unsigned vec_count;
__m128i max_ui4 = _mm_setzero_si128();
__m128i min_ui4 = _mm_set1_epi32(~0U);
__m128i ui_indices4;
__m128i *ui_indices_ptr;
vec_count = aligned_count & ~0x3;
ui_indices_ptr = (__m128i *)ui_indices;
for (i = 0; i < vec_count / 4; i++) {
ui_indices4 = _mm_load_si128(&ui_indices_ptr[i]);
max_ui4 = _mm_max_epu32(ui_indices4, max_ui4);
min_ui4 = _mm_min_epu32(ui_indices4, min_ui4);
}
_mm_store_si128((__m128i *)max_arr, max_ui4);
_mm_store_si128((__m128i *)min_arr, min_ui4);
for (i = 0; i < 4; i++) {
if (max_arr[i] > max_ui)
max_ui = max_arr[i];
if (min_arr[i] < min_ui)
min_ui = min_arr[i];
}
i = vec_count;
}
for (; i < aligned_count; i++) {
if (ui_indices[i] > max_ui)
max_ui = ui_indices[i];
if (ui_indices[i] < min_ui)
min_ui = ui_indices[i];
}
*min_index = min_ui;
*max_index = max_ui;
}
#endif
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