ref: 7ae75c3d525d79b9b28652fb34082cf81a5de9ab
dir: /vp8/encoder/arm/neon/fastquantizeb_neon.c/
/*
* Copyright (c) 2014 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 <arm_neon.h>
#include "vp8/encoder/block.h"
#include "vpx_mem/vpx_mem.h"
static const uint16_t inv_zig_zag[16] = {
0x0001, 0x0002, 0x0006, 0x0007,
0x0003, 0x0005, 0x0008, 0x000d,
0x0004, 0x0009, 0x000c, 0x000e,
0x000a, 0x000b, 0x000f, 0x0010
};
void vp8_fast_quantize_b_neon(BLOCK *b, BLOCKD *d) {
const int16x8_t one_q = vdupq_n_s16(0xff),
z0 = vld1q_s16(b->coeff),
z1 = vld1q_s16(b->coeff + 8),
round0 = vld1q_s16(b->round),
round1 = vld1q_s16(b->round + 8),
quant0 = vld1q_s16(b->quant_fast),
quant1 = vld1q_s16(b->quant_fast + 8),
dequant0 = vld1q_s16(d->dequant),
dequant1 = vld1q_s16(d->dequant + 8);
const uint16x8_t zig_zag0 = vld1q_u16(inv_zig_zag),
zig_zag1 = vld1q_u16(inv_zig_zag + 8);
int16x8_t x0, x1, sz0, sz1, y0, y1;
uint16x8_t eob0, eob1;
uint16x4_t eob_d16;
uint32x2_t eob_d32;
uint32x4_t eob_q32;
/* sign of z: z >> 15 */
sz0 = vshrq_n_s16(z0, 15);
sz1 = vshrq_n_s16(z1, 15);
/* x = abs(z) */
x0 = vabsq_s16(z0);
x1 = vabsq_s16(z1);
/* x += round */
x0 = vaddq_s16(x0, round0);
x1 = vaddq_s16(x1, round1);
/* y = 2 * (x * quant) >> 16 */
y0 = vqdmulhq_s16(x0, quant0);
y1 = vqdmulhq_s16(x1, quant1);
/* Compensate for doubling in vqdmulhq */
y0 = vshrq_n_s16(y0, 1);
y1 = vshrq_n_s16(y1, 1);
/* Restore sign bit */
y0 = veorq_s16(y0, sz0);
y1 = veorq_s16(y1, sz1);
x0 = vsubq_s16(y0, sz0);
x1 = vsubq_s16(y1, sz1);
/* find non-zero elements */
eob0 = vtstq_s16(x0, one_q);
eob1 = vtstq_s16(x1, one_q);
/* mask zig zag */
eob0 = vandq_u16(eob0, zig_zag0);
eob1 = vandq_u16(eob1, zig_zag1);
/* select the largest value */
eob0 = vmaxq_u16(eob0, eob1);
eob_d16 = vmax_u16(vget_low_u16(eob0), vget_high_u16(eob0));
eob_q32 = vmovl_u16(eob_d16);
eob_d32 = vmax_u32(vget_low_u32(eob_q32), vget_high_u32(eob_q32));
eob_d32 = vpmax_u32(eob_d32, eob_d32);
/* qcoeff = x */
vst1q_s16(d->qcoeff, x0);
vst1q_s16(d->qcoeff + 8, x1);
/* dqcoeff = x * dequant */
vst1q_s16(d->dqcoeff, vmulq_s16(dequant0, x0));
vst1q_s16(d->dqcoeff + 8, vmulq_s16(dequant1, x1));
vst1_lane_s8((int8_t *)d->eob, vreinterpret_s8_u32(eob_d32), 0);
}
void vp8_fast_quantize_b_pair_neon(BLOCK *b0, BLOCK *b1,
BLOCKD *d0, BLOCKD *d1) {
const int16x8_t one_q = vdupq_n_s16(0xff),
b0_z0 = vld1q_s16(b0->coeff),
b0_z1 = vld1q_s16(b0->coeff + 8),
b0_round0 = vld1q_s16(b0->round),
b0_round1 = vld1q_s16(b0->round + 8),
b0_quant0 = vld1q_s16(b0->quant_fast),
b0_quant1 = vld1q_s16(b0->quant_fast + 8),
d0_dequant0 = vld1q_s16(d0->dequant),
d0_dequant1 = vld1q_s16(d0->dequant + 8),
b1_z0 = vld1q_s16(b1->coeff),
b1_z1 = vld1q_s16(b1->coeff + 8),
b1_round0 = vld1q_s16(b1->round),
b1_round1 = vld1q_s16(b1->round + 8),
b1_quant0 = vld1q_s16(b1->quant_fast),
b1_quant1 = vld1q_s16(b1->quant_fast + 8),
d1_dequant0 = vld1q_s16(d1->dequant),
d1_dequant1 = vld1q_s16(d1->dequant + 8);
const uint16x8_t zig_zag0 = vld1q_u16(inv_zig_zag),
zig_zag1 = vld1q_u16(inv_zig_zag + 8);
int16x8_t b0_x0, b0_x1, b0_sz0, b0_sz1, b0_y0, b0_y1,
b1_x0, b1_x1, b1_sz0, b1_sz1, b1_y0, b1_y1;
uint16x8_t b0_eob0, b0_eob1,
b1_eob0, b1_eob1;
uint16x4_t b0_eob_d16, b1_eob_d16;
uint32x2_t b0_eob_d32, b1_eob_d32;
uint32x4_t b0_eob_q32, b1_eob_q32;
/* sign of z: z >> 15 */
b0_sz0 = vshrq_n_s16(b0_z0, 15);
b0_sz1 = vshrq_n_s16(b0_z1, 15);
b1_sz0 = vshrq_n_s16(b1_z0, 15);
b1_sz1 = vshrq_n_s16(b1_z1, 15);
/* x = abs(z) */
b0_x0 = vabsq_s16(b0_z0);
b0_x1 = vabsq_s16(b0_z1);
b1_x0 = vabsq_s16(b1_z0);
b1_x1 = vabsq_s16(b1_z1);
/* x += round */
b0_x0 = vaddq_s16(b0_x0, b0_round0);
b0_x1 = vaddq_s16(b0_x1, b0_round1);
b1_x0 = vaddq_s16(b1_x0, b1_round0);
b1_x1 = vaddq_s16(b1_x1, b1_round1);
/* y = 2 * (x * quant) >> 16 */
b0_y0 = vqdmulhq_s16(b0_x0, b0_quant0);
b0_y1 = vqdmulhq_s16(b0_x1, b0_quant1);
b1_y0 = vqdmulhq_s16(b1_x0, b1_quant0);
b1_y1 = vqdmulhq_s16(b1_x1, b1_quant1);
/* Compensate for doubling in vqdmulhq */
b0_y0 = vshrq_n_s16(b0_y0, 1);
b0_y1 = vshrq_n_s16(b0_y1, 1);
b1_y0 = vshrq_n_s16(b1_y0, 1);
b1_y1 = vshrq_n_s16(b1_y1, 1);
/* Restore sign bit */
b0_y0 = veorq_s16(b0_y0, b0_sz0);
b0_y1 = veorq_s16(b0_y1, b0_sz1);
b0_x0 = vsubq_s16(b0_y0, b0_sz0);
b0_x1 = vsubq_s16(b0_y1, b0_sz1);
b1_y0 = veorq_s16(b1_y0, b1_sz0);
b1_y1 = veorq_s16(b1_y1, b1_sz1);
b1_x0 = vsubq_s16(b1_y0, b1_sz0);
b1_x1 = vsubq_s16(b1_y1, b1_sz1);
/* find non-zero elements */
b0_eob0 = vtstq_s16(b0_x0, one_q);
b0_eob1 = vtstq_s16(b0_x1, one_q);
b1_eob0 = vtstq_s16(b1_x0, one_q);
b1_eob1 = vtstq_s16(b1_x1, one_q);
/* mask zig zag */
b0_eob0 = vandq_u16(b0_eob0, zig_zag0);
b0_eob1 = vandq_u16(b0_eob1, zig_zag1);
b1_eob0 = vandq_u16(b1_eob0, zig_zag0);
b1_eob1 = vandq_u16(b1_eob1, zig_zag1);
/* select the largest value */
b0_eob0 = vmaxq_u16(b0_eob0, b0_eob1);
b0_eob_d16 = vmax_u16(vget_low_u16(b0_eob0),
vget_high_u16(b0_eob0));
b0_eob_q32 = vmovl_u16(b0_eob_d16);
b0_eob_d32 = vmax_u32(vget_low_u32(b0_eob_q32),
vget_high_u32(b0_eob_q32));
b0_eob_d32 = vpmax_u32(b0_eob_d32, b0_eob_d32);
b1_eob0 = vmaxq_u16(b1_eob0, b1_eob1);
b1_eob_d16 = vmax_u16(vget_low_u16(b1_eob0),
vget_high_u16(b1_eob0));
b1_eob_q32 = vmovl_u16(b1_eob_d16);
b1_eob_d32 = vmax_u32(vget_low_u32(b1_eob_q32),
vget_high_u32(b1_eob_q32));
b1_eob_d32 = vpmax_u32(b1_eob_d32, b1_eob_d32);
/* qcoeff = x */
vst1q_s16(d0->qcoeff, b0_x0);
vst1q_s16(d0->qcoeff + 8, b0_x1);
vst1q_s16(d1->qcoeff, b1_x0);
vst1q_s16(d1->qcoeff + 8, b1_x1);
/* dqcoeff = x * dequant */
vst1q_s16(d0->dqcoeff, vmulq_s16(d0_dequant0, b0_x0));
vst1q_s16(d0->dqcoeff + 8, vmulq_s16(d0_dequant1, b0_x1));
vst1q_s16(d1->dqcoeff, vmulq_s16(d1_dequant0, b1_x0));
vst1q_s16(d1->dqcoeff + 8, vmulq_s16(d1_dequant1, b1_x1));
vst1_lane_s8((int8_t *)d0->eob, vreinterpret_s8_u32(b0_eob_d32), 0);
vst1_lane_s8((int8_t *)d1->eob, vreinterpret_s8_u32(b1_eob_d32), 0);
return;
}