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/*
* Copyright (c) 2012 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <smmintrin.h> /* SSE4.1 */
#include "./vp8_rtcd.h"
#include "vp8/encoder/block.h"
#include "vpx_ports/bitops.h" /* get_lsb */
void vp8_regular_quantize_b_sse4_1(BLOCK *b, BLOCKD *d) {
int eob = -1;
short *zbin_boost_ptr = b->zrun_zbin_boost;
__m128i zbin_boost0 = _mm_load_si128((__m128i *)(zbin_boost_ptr));
__m128i zbin_boost1 = _mm_load_si128((__m128i *)(zbin_boost_ptr + 8));
__m128i x0, x1, y0, y1, x_minus_zbin0, x_minus_zbin1, dqcoeff0, dqcoeff1;
__m128i quant_shift0 = _mm_load_si128((__m128i *)(b->quant_shift));
__m128i quant_shift1 = _mm_load_si128((__m128i *)(b->quant_shift + 8));
__m128i z0 = _mm_load_si128((__m128i *)(b->coeff));
__m128i z1 = _mm_load_si128((__m128i *)(b->coeff + 8));
__m128i zbin_extra = _mm_cvtsi32_si128(b->zbin_extra);
__m128i zbin0 = _mm_load_si128((__m128i *)(b->zbin));
__m128i zbin1 = _mm_load_si128((__m128i *)(b->zbin + 8));
__m128i round0 = _mm_load_si128((__m128i *)(b->round));
__m128i round1 = _mm_load_si128((__m128i *)(b->round + 8));
__m128i quant0 = _mm_load_si128((__m128i *)(b->quant));
__m128i quant1 = _mm_load_si128((__m128i *)(b->quant + 8));
__m128i dequant0 = _mm_load_si128((__m128i *)(d->dequant));
__m128i dequant1 = _mm_load_si128((__m128i *)(d->dequant + 8));
__m128i qcoeff0, qcoeff1, t0, t1, x_shuf0, x_shuf1;
uint32_t mask, ymask;
DECLARE_ALIGNED(16, static const uint8_t,
zig_zag_mask[16]) = { 0, 1, 4, 8, 5, 2, 3, 6,
9, 12, 13, 10, 7, 11, 14, 15 };
DECLARE_ALIGNED(16, uint16_t, qcoeff[16]) = { 0 };
/* Duplicate to all lanes. */
zbin_extra = _mm_shufflelo_epi16(zbin_extra, 0);
zbin_extra = _mm_unpacklo_epi16(zbin_extra, zbin_extra);
/* x = abs(z) */
x0 = _mm_abs_epi16(z0);
x1 = _mm_abs_epi16(z1);
/* zbin[] + zbin_extra */
zbin0 = _mm_add_epi16(zbin0, zbin_extra);
zbin1 = _mm_add_epi16(zbin1, zbin_extra);
/* In C x is compared to zbin where zbin = zbin[] + boost + extra. Rebalance
* the equation because boost is the only value which can change:
* x - (zbin[] + extra) >= boost */
x_minus_zbin0 = _mm_sub_epi16(x0, zbin0);
x_minus_zbin1 = _mm_sub_epi16(x1, zbin1);
/* All the remaining calculations are valid whether they are done now with
* simd or later inside the loop one at a time. */
x0 = _mm_add_epi16(x0, round0);
x1 = _mm_add_epi16(x1, round1);
y0 = _mm_mulhi_epi16(x0, quant0);
y1 = _mm_mulhi_epi16(x1, quant1);
y0 = _mm_add_epi16(y0, x0);
y1 = _mm_add_epi16(y1, x1);
/* Instead of shifting each value independently we convert the scaling
* factor with 1 << (16 - shift) so we can use multiply/return high half. */
y0 = _mm_mulhi_epi16(y0, quant_shift0);
y1 = _mm_mulhi_epi16(y1, quant_shift1);
/* Restore the sign. */
y0 = _mm_sign_epi16(y0, z0);
y1 = _mm_sign_epi16(y1, z1);
{
const __m128i zig_zag_i16_0 =
_mm_setr_epi8(0, 1, 2, 3, 8, 9, 14, 15, 10, 11, 4, 5, 6, 7, 12, 13);
const __m128i zig_zag_i16_1 =
_mm_setr_epi8(0, 1, 6, 7, 8, 9, 2, 3, 14, 15, 4, 5, 10, 11, 12, 13);
/* The first part of the zig zag needs a value
* from x_minus_zbin1 and vice versa. */
t1 = _mm_alignr_epi8(x_minus_zbin1, x_minus_zbin1, 2);
t0 = _mm_blend_epi16(x_minus_zbin0, t1, 0x80);
t1 = _mm_blend_epi16(t1, x_minus_zbin0, 0x80);
x_shuf0 = _mm_shuffle_epi8(t0, zig_zag_i16_0);
x_shuf1 = _mm_shuffle_epi8(t1, zig_zag_i16_1);
}
/* Check if y is nonzero and put it in zig zag order. */
t0 = _mm_packs_epi16(y0, y1);
t0 = _mm_cmpeq_epi8(t0, _mm_setzero_si128());
t0 = _mm_shuffle_epi8(t0, _mm_load_si128((const __m128i *)zig_zag_mask));
ymask = _mm_movemask_epi8(t0) ^ 0xffff;
for (;;) {
t0 = _mm_cmpgt_epi16(zbin_boost0, x_shuf0);
t1 = _mm_cmpgt_epi16(zbin_boost1, x_shuf1);
t0 = _mm_packs_epi16(t0, t1);
mask = _mm_movemask_epi8(t0);
mask = ~mask & ymask;
if (!mask) break;
/* |eob| will contain the index of the next found element where:
* boost[i - old_eob - 1] <= x[zigzag[i]] && y[zigzag[i]] != 0 */
eob = get_lsb(mask);
/* Need to clear the mask from processed elements so that
* they are no longer counted in the next iteration. */
ymask &= ~1U << eob;
/* It's safe to read ahead of this buffer if struct VP8_COMP has at
* least 32 bytes before the zrun_zbin_boost_* fields (it has 384).
* Any data read outside of the buffer is masked by the updated |ymask|. */
zbin_boost0 = _mm_loadu_si128((__m128i *)(zbin_boost_ptr - eob - 1));
zbin_boost1 = _mm_loadu_si128((__m128i *)(zbin_boost_ptr - eob + 7));
qcoeff[zig_zag_mask[eob]] = 0xffff;
}
qcoeff0 = _mm_load_si128((__m128i *)(qcoeff));
qcoeff1 = _mm_load_si128((__m128i *)(qcoeff + 8));
qcoeff0 = _mm_and_si128(qcoeff0, y0);
qcoeff1 = _mm_and_si128(qcoeff1, y1);
_mm_store_si128((__m128i *)(d->qcoeff), qcoeff0);
_mm_store_si128((__m128i *)(d->qcoeff + 8), qcoeff1);
dqcoeff0 = _mm_mullo_epi16(qcoeff0, dequant0);
dqcoeff1 = _mm_mullo_epi16(qcoeff1, dequant1);
_mm_store_si128((__m128i *)(d->dqcoeff), dqcoeff0);
_mm_store_si128((__m128i *)(d->dqcoeff + 8), dqcoeff1);
*d->eob = eob + 1;
}
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