src/libFLAC/stream_encoder_intrin_sse2.c

/* libFLAC - Free Lossless Audio Codec library
 * Copyright (C) 2000-2009  Josh Coalson
 * Copyright (C) 2011-2013  Xiph.Org Foundation
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 * - Neither the name of the Xiph.org Foundation nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#if HAVE_CONFIG_H
#  include <config.h>
#endif

#ifndef FLAC__NO_ASM
#if (defined FLAC__CPU_IA32 || defined FLAC__CPU_X86_64) && defined FLAC__HAS_X86INTRIN

#include <stdlib.h>    /* for abs() */
#include <emmintrin.h> /* SSE2 */
#include "FLAC/assert.h"
#include "private/stream_encoder.h"

void precompute_partition_info_sums_intrin_sse2(const FLAC__int32 residual[], FLAC__uint64 abs_residual_partition_sums[],
		unsigned residual_samples, unsigned predictor_order, unsigned min_partition_order, unsigned max_partition_order, unsigned bps)
{
	const unsigned default_partition_samples = (residual_samples + predictor_order) >> max_partition_order;
	unsigned partitions = 1u << max_partition_order;

	FLAC__ASSERT(default_partition_samples > predictor_order);

	/* first do max_partition_order */
	{
		unsigned partition, residual_sample, end = (unsigned)(-(int)predictor_order);
		unsigned e1, e3;
		__m128i mm_res, mm_sum, mm_mask;

		if(bps <= 16) {
			FLAC__uint32 abs_residual_partition_sum;

			for(partition = residual_sample = 0; partition < partitions; partition++) {
				end += default_partition_samples;
				abs_residual_partition_sum = 0;
				mm_sum = _mm_setzero_si128();

				e1 = (residual_sample + 3) & ~3; e3 = end & ~3;
				if(e1 > end)
					e1 = end; /* try flac -l 1 -b 16 and you'll be here */

				/* assumption: residual[] is properly aligned so (residual + e1) is properly aligned too and _mm_loadu_si128() is fast*/
				for( ; residual_sample < e1; residual_sample++)
					abs_residual_partition_sum += abs(residual[residual_sample]); /* abs(INT_MIN) is undefined, but if the residual is INT_MIN we have bigger problems */

				for( ; residual_sample < e3; residual_sample+=4) {
					mm_res = _mm_loadu_si128((const __m128i*)(residual+residual_sample));

					mm_mask = _mm_srai_epi32(mm_res, 31);
					mm_res = _mm_xor_si128(mm_res, mm_mask);
					mm_res = _mm_sub_epi32(mm_res, mm_mask);

					mm_sum = _mm_add_epi32(mm_sum, mm_res);
				}

				mm_sum = _mm_add_epi32(mm_sum, _mm_srli_si128(mm_sum, 8));
				mm_sum = _mm_add_epi32(mm_sum, _mm_srli_si128(mm_sum, 4));
				abs_residual_partition_sum += _mm_cvtsi128_si32(mm_sum);

				for( ; residual_sample < end; residual_sample++)
					abs_residual_partition_sum += abs(residual[residual_sample]);

				abs_residual_partition_sums[partition] = abs_residual_partition_sum;
			}
		}
		else { /* have to pessimistically use 64 bits for accumulator */
			FLAC__uint64 abs_residual_partition_sum;

			for(partition = residual_sample = 0; partition < partitions; partition++) {
				end += default_partition_samples;
				abs_residual_partition_sum = 0;
				mm_sum = _mm_setzero_si128();

				e1 = (residual_sample + 1) & ~1; e3 = end & ~1;
				FLAC__ASSERT(e1 <= end);

				for( ; residual_sample < e1; residual_sample++)
					abs_residual_partition_sum += abs(residual[residual_sample]);

				for( ; residual_sample < e3; residual_sample+=2) {
					mm_res = _mm_loadl_epi64((const __m128i*)(residual+residual_sample)); /*  0   0   r1  r0 */

					mm_mask = _mm_srai_epi32(mm_res, 31);
					mm_res = _mm_xor_si128(mm_res, mm_mask);
					mm_res = _mm_sub_epi32(mm_res, mm_mask); /*  0   0  |r1|   |r0| */

					mm_res = _mm_shuffle_epi32(mm_res, _MM_SHUFFLE(3,1,2,0)); /* 0  |r1|  0  |r0|  ==  |r1_64|  |r0_64|  */
					mm_sum = _mm_add_epi64(mm_sum, mm_res);
				}

				mm_sum = _mm_add_epi64(mm_sum, _mm_srli_si128(mm_sum, 8));
#ifdef FLAC__CPU_IA32
#ifdef _MSC_VER
				abs_residual_partition_sum += mm_sum.m128i_u64[0];
#else
				{
					FLAC__uint64 tmp[2];
					_mm_storel_epi64((__m128i *)tmp, mm_sum);
					abs_residual_partition_sum += tmp[0];
				}
#endif
#else
				abs_residual_partition_sum += _mm_cvtsi128_si64(mm_sum);
#endif

				for( ; residual_sample < end; residual_sample++)
					abs_residual_partition_sum += abs(residual[residual_sample]);

				abs_residual_partition_sums[partition] = abs_residual_partition_sum;
			}
		}
	}

	/* now merge partitions for lower orders */
	{
		unsigned from_partition = 0, to_partition = partitions;
		int partition_order;
		for(partition_order = (int)max_partition_order - 1; partition_order >= (int)min_partition_order; partition_order--) {
			unsigned i;
			partitions >>= 1;
			for(i = 0; i < partitions; i++) {
				abs_residual_partition_sums[to_partition++] =
					abs_residual_partition_sums[from_partition  ] +
					abs_residual_partition_sums[from_partition+1];
				from_partition += 2;
			}
		}
	}
}

#endif /* (FLAC__CPU_IA32 || FLAC__CPU_X86_64) && FLAC__HAS_X86INTRIN */
#endif /* FLAC__NO_ASM */