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jcphuff-neon.c
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/*
* jcphuff-neon.c - prepare data for progressive Huffman encoding (Arm Neon)
*
* Copyright (C) 2020-2021, Arm Limited. All Rights Reserved.
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/
#define JPEG_INTERNALS
#include "jconfigint.h"
#include "../../jinclude.h"
#include "../../jpeglib.h"
#include "../../jsimd.h"
#include "../../jdct.h"
#include "../../jsimddct.h"
#include "../jsimd.h"
#include "neon-compat.h"
#include <arm_neon.h>
/* Data preparation for encode_mcu_AC_first().
*
* The equivalent scalar C function (encode_mcu_AC_first_prepare()) can be
* found in jcphuff.c.
*/
void jsimd_encode_mcu_AC_first_prepare_neon
(const JCOEF *block, const int *jpeg_natural_order_start, int Sl, int Al,
JCOEF *values, size_t *zerobits)
{
JCOEF *values_ptr = values;
JCOEF *diff_values_ptr = values + DCTSIZE2;
/* Rows of coefficients to zero (since they haven't been processed) */
int i, rows_to_zero = 8;
for (i = 0; i < Sl / 16; i++) {
int16x8_t coefs1 = vld1q_dup_s16(block + jpeg_natural_order_start[0]);
coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[1], coefs1, 1);
coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[2], coefs1, 2);
coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[3], coefs1, 3);
coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[4], coefs1, 4);
coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[5], coefs1, 5);
coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[6], coefs1, 6);
coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[7], coefs1, 7);
int16x8_t coefs2 = vld1q_dup_s16(block + jpeg_natural_order_start[8]);
coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[9], coefs2, 1);
coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[10], coefs2, 2);
coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[11], coefs2, 3);
coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[12], coefs2, 4);
coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[13], coefs2, 5);
coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[14], coefs2, 6);
coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[15], coefs2, 7);
/* Isolate sign of coefficients. */
int16x8_t sign_coefs1 = vshrq_n_s16(coefs1, 15);
int16x8_t sign_coefs2 = vshrq_n_s16(coefs2, 15);
/* Compute absolute value of coefficients and apply point transform Al. */
int16x8_t abs_coefs1 = vabsq_s16(coefs1);
int16x8_t abs_coefs2 = vabsq_s16(coefs2);
coefs1 = vshlq_s16(abs_coefs1, vdupq_n_s16(-Al));
coefs2 = vshlq_s16(abs_coefs2, vdupq_n_s16(-Al));
/* Compute diff values. */
int16x8_t diff1 = veorq_s16(coefs1, sign_coefs1);
int16x8_t diff2 = veorq_s16(coefs2, sign_coefs2);
/* Store transformed coefficients and diff values. */
vst1q_s16(values_ptr, coefs1);
vst1q_s16(values_ptr + DCTSIZE, coefs2);
vst1q_s16(diff_values_ptr, diff1);
vst1q_s16(diff_values_ptr + DCTSIZE, diff2);
values_ptr += 16;
diff_values_ptr += 16;
jpeg_natural_order_start += 16;
rows_to_zero -= 2;
}
/* Same operation but for remaining partial vector */
int remaining_coefs = Sl % 16;
if (remaining_coefs > 8) {
int16x8_t coefs1 = vld1q_dup_s16(block + jpeg_natural_order_start[0]);
coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[1], coefs1, 1);
coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[2], coefs1, 2);
coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[3], coefs1, 3);
coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[4], coefs1, 4);
coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[5], coefs1, 5);
coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[6], coefs1, 6);
coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[7], coefs1, 7);
int16x8_t coefs2 = vdupq_n_s16(0);
switch (remaining_coefs) {
case 15:
coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[14], coefs2, 6);
FALLTHROUGH /*FALLTHROUGH*/
case 14:
coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[13], coefs2, 5);
FALLTHROUGH /*FALLTHROUGH*/
case 13:
coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[12], coefs2, 4);
FALLTHROUGH /*FALLTHROUGH*/
case 12:
coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[11], coefs2, 3);
FALLTHROUGH /*FALLTHROUGH*/
case 11:
coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[10], coefs2, 2);
FALLTHROUGH /*FALLTHROUGH*/
case 10:
coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[9], coefs2, 1);
FALLTHROUGH /*FALLTHROUGH*/
case 9:
coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[8], coefs2, 0);
FALLTHROUGH /*FALLTHROUGH*/
default:
break;
}
/* Isolate sign of coefficients. */
int16x8_t sign_coefs1 = vshrq_n_s16(coefs1, 15);
int16x8_t sign_coefs2 = vshrq_n_s16(coefs2, 15);
/* Compute absolute value of coefficients and apply point transform Al. */
int16x8_t abs_coefs1 = vabsq_s16(coefs1);
int16x8_t abs_coefs2 = vabsq_s16(coefs2);
coefs1 = vshlq_s16(abs_coefs1, vdupq_n_s16(-Al));
coefs2 = vshlq_s16(abs_coefs2, vdupq_n_s16(-Al));
/* Compute diff values. */
int16x8_t diff1 = veorq_s16(coefs1, sign_coefs1);
int16x8_t diff2 = veorq_s16(coefs2, sign_coefs2);
/* Store transformed coefficients and diff values. */
vst1q_s16(values_ptr, coefs1);
vst1q_s16(values_ptr + DCTSIZE, coefs2);
vst1q_s16(diff_values_ptr, diff1);
vst1q_s16(diff_values_ptr + DCTSIZE, diff2);
values_ptr += 16;
diff_values_ptr += 16;
rows_to_zero -= 2;
} else if (remaining_coefs > 0) {
int16x8_t coefs = vdupq_n_s16(0);
switch (remaining_coefs) {
case 8:
coefs = vld1q_lane_s16(block + jpeg_natural_order_start[7], coefs, 7);
FALLTHROUGH /*FALLTHROUGH*/
case 7:
coefs = vld1q_lane_s16(block + jpeg_natural_order_start[6], coefs, 6);
FALLTHROUGH /*FALLTHROUGH*/
case 6:
coefs = vld1q_lane_s16(block + jpeg_natural_order_start[5], coefs, 5);
FALLTHROUGH /*FALLTHROUGH*/
case 5:
coefs = vld1q_lane_s16(block + jpeg_natural_order_start[4], coefs, 4);
FALLTHROUGH /*FALLTHROUGH*/
case 4:
coefs = vld1q_lane_s16(block + jpeg_natural_order_start[3], coefs, 3);
FALLTHROUGH /*FALLTHROUGH*/
case 3:
coefs = vld1q_lane_s16(block + jpeg_natural_order_start[2], coefs, 2);
FALLTHROUGH /*FALLTHROUGH*/
case 2:
coefs = vld1q_lane_s16(block + jpeg_natural_order_start[1], coefs, 1);
FALLTHROUGH /*FALLTHROUGH*/
case 1:
coefs = vld1q_lane_s16(block + jpeg_natural_order_start[0], coefs, 0);
FALLTHROUGH /*FALLTHROUGH*/
default:
break;
}
/* Isolate sign of coefficients. */
int16x8_t sign_coefs = vshrq_n_s16(coefs, 15);
/* Compute absolute value of coefficients and apply point transform Al. */
int16x8_t abs_coefs = vabsq_s16(coefs);
coefs = vshlq_s16(abs_coefs, vdupq_n_s16(-Al));
/* Compute diff values. */
int16x8_t diff = veorq_s16(coefs, sign_coefs);
/* Store transformed coefficients and diff values. */
vst1q_s16(values_ptr, coefs);
vst1q_s16(diff_values_ptr, diff);
values_ptr += 8;
diff_values_ptr += 8;
rows_to_zero--;
}
/* Zero remaining memory in the values and diff_values blocks. */
for (i = 0; i < rows_to_zero; i++) {
vst1q_s16(values_ptr, vdupq_n_s16(0));
vst1q_s16(diff_values_ptr, vdupq_n_s16(0));
values_ptr += 8;
diff_values_ptr += 8;
}
/* Construct zerobits bitmap. A set bit means that the corresponding
* coefficient != 0.
*/
int16x8_t row0 = vld1q_s16(values + 0 * DCTSIZE);
int16x8_t row1 = vld1q_s16(values + 1 * DCTSIZE);
int16x8_t row2 = vld1q_s16(values + 2 * DCTSIZE);
int16x8_t row3 = vld1q_s16(values + 3 * DCTSIZE);
int16x8_t row4 = vld1q_s16(values + 4 * DCTSIZE);
int16x8_t row5 = vld1q_s16(values + 5 * DCTSIZE);
int16x8_t row6 = vld1q_s16(values + 6 * DCTSIZE);
int16x8_t row7 = vld1q_s16(values + 7 * DCTSIZE);
uint8x8_t row0_eq0 = vmovn_u16(vceqq_s16(row0, vdupq_n_s16(0)));
uint8x8_t row1_eq0 = vmovn_u16(vceqq_s16(row1, vdupq_n_s16(0)));
uint8x8_t row2_eq0 = vmovn_u16(vceqq_s16(row2, vdupq_n_s16(0)));
uint8x8_t row3_eq0 = vmovn_u16(vceqq_s16(row3, vdupq_n_s16(0)));
uint8x8_t row4_eq0 = vmovn_u16(vceqq_s16(row4, vdupq_n_s16(0)));
uint8x8_t row5_eq0 = vmovn_u16(vceqq_s16(row5, vdupq_n_s16(0)));
uint8x8_t row6_eq0 = vmovn_u16(vceqq_s16(row6, vdupq_n_s16(0)));
uint8x8_t row7_eq0 = vmovn_u16(vceqq_s16(row7, vdupq_n_s16(0)));
/* { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80 } */
const uint8x8_t bitmap_mask =
vreinterpret_u8_u64(vmov_n_u64(0x8040201008040201));
row0_eq0 = vand_u8(row0_eq0, bitmap_mask);
row1_eq0 = vand_u8(row1_eq0, bitmap_mask);
row2_eq0 = vand_u8(row2_eq0, bitmap_mask);
row3_eq0 = vand_u8(row3_eq0, bitmap_mask);
row4_eq0 = vand_u8(row4_eq0, bitmap_mask);
row5_eq0 = vand_u8(row5_eq0, bitmap_mask);
row6_eq0 = vand_u8(row6_eq0, bitmap_mask);
row7_eq0 = vand_u8(row7_eq0, bitmap_mask);
uint8x8_t bitmap_rows_01 = vpadd_u8(row0_eq0, row1_eq0);
uint8x8_t bitmap_rows_23 = vpadd_u8(row2_eq0, row3_eq0);
uint8x8_t bitmap_rows_45 = vpadd_u8(row4_eq0, row5_eq0);
uint8x8_t bitmap_rows_67 = vpadd_u8(row6_eq0, row7_eq0);
uint8x8_t bitmap_rows_0123 = vpadd_u8(bitmap_rows_01, bitmap_rows_23);
uint8x8_t bitmap_rows_4567 = vpadd_u8(bitmap_rows_45, bitmap_rows_67);
uint8x8_t bitmap_all = vpadd_u8(bitmap_rows_0123, bitmap_rows_4567);
#if defined(__aarch64__) || defined(_M_ARM64)
/* Move bitmap to a 64-bit scalar register. */
uint64_t bitmap = vget_lane_u64(vreinterpret_u64_u8(bitmap_all), 0);
/* Store zerobits bitmap. */
*zerobits = ~bitmap;
#else
/* Move bitmap to two 32-bit scalar registers. */
uint32_t bitmap0 = vget_lane_u32(vreinterpret_u32_u8(bitmap_all), 0);
uint32_t bitmap1 = vget_lane_u32(vreinterpret_u32_u8(bitmap_all), 1);
/* Store zerobits bitmap. */
zerobits[0] = ~bitmap0;
zerobits[1] = ~bitmap1;
#endif
}
/* Data preparation for encode_mcu_AC_refine().
*
* The equivalent scalar C function (encode_mcu_AC_refine_prepare()) can be
* found in jcphuff.c.
*/
int jsimd_encode_mcu_AC_refine_prepare_neon
(const JCOEF *block, const int *jpeg_natural_order_start, int Sl, int Al,
JCOEF *absvalues, size_t *bits)
{
/* Temporary storage buffers for data used to compute the signbits bitmap and
* the end-of-block (EOB) position
*/
uint8_t coef_sign_bits[64];
uint8_t coef_eq1_bits[64];
JCOEF *absvalues_ptr = absvalues;
uint8_t *coef_sign_bits_ptr = coef_sign_bits;
uint8_t *eq1_bits_ptr = coef_eq1_bits;
/* Rows of coefficients to zero (since they haven't been processed) */
int i, rows_to_zero = 8;
for (i = 0; i < Sl / 16; i++) {
int16x8_t coefs1 = vld1q_dup_s16(block + jpeg_natural_order_start[0]);
coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[1], coefs1, 1);
coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[2], coefs1, 2);
coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[3], coefs1, 3);
coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[4], coefs1, 4);
coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[5], coefs1, 5);
coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[6], coefs1, 6);
coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[7], coefs1, 7);
int16x8_t coefs2 = vld1q_dup_s16(block + jpeg_natural_order_start[8]);
coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[9], coefs2, 1);
coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[10], coefs2, 2);
coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[11], coefs2, 3);
coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[12], coefs2, 4);
coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[13], coefs2, 5);
coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[14], coefs2, 6);
coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[15], coefs2, 7);
/* Compute and store data for signbits bitmap. */
uint8x8_t sign_coefs1 =
vmovn_u16(vreinterpretq_u16_s16(vshrq_n_s16(coefs1, 15)));
uint8x8_t sign_coefs2 =
vmovn_u16(vreinterpretq_u16_s16(vshrq_n_s16(coefs2, 15)));
vst1_u8(coef_sign_bits_ptr, sign_coefs1);
vst1_u8(coef_sign_bits_ptr + DCTSIZE, sign_coefs2);
/* Compute absolute value of coefficients and apply point transform Al. */
int16x8_t abs_coefs1 = vabsq_s16(coefs1);
int16x8_t abs_coefs2 = vabsq_s16(coefs2);
coefs1 = vshlq_s16(abs_coefs1, vdupq_n_s16(-Al));
coefs2 = vshlq_s16(abs_coefs2, vdupq_n_s16(-Al));
vst1q_s16(absvalues_ptr, coefs1);
vst1q_s16(absvalues_ptr + DCTSIZE, coefs2);
/* Test whether transformed coefficient values == 1 (used to find EOB
* position.)
*/
uint8x8_t coefs_eq11 = vmovn_u16(vceqq_s16(coefs1, vdupq_n_s16(1)));
uint8x8_t coefs_eq12 = vmovn_u16(vceqq_s16(coefs2, vdupq_n_s16(1)));
vst1_u8(eq1_bits_ptr, coefs_eq11);
vst1_u8(eq1_bits_ptr + DCTSIZE, coefs_eq12);
absvalues_ptr += 16;
coef_sign_bits_ptr += 16;
eq1_bits_ptr += 16;
jpeg_natural_order_start += 16;
rows_to_zero -= 2;
}
/* Same operation but for remaining partial vector */
int remaining_coefs = Sl % 16;
if (remaining_coefs > 8) {
int16x8_t coefs1 = vld1q_dup_s16(block + jpeg_natural_order_start[0]);
coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[1], coefs1, 1);
coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[2], coefs1, 2);
coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[3], coefs1, 3);
coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[4], coefs1, 4);
coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[5], coefs1, 5);
coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[6], coefs1, 6);
coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[7], coefs1, 7);
int16x8_t coefs2 = vdupq_n_s16(0);
switch (remaining_coefs) {
case 15:
coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[14], coefs2, 6);
FALLTHROUGH /*FALLTHROUGH*/
case 14:
coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[13], coefs2, 5);
FALLTHROUGH /*FALLTHROUGH*/
case 13:
coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[12], coefs2, 4);
FALLTHROUGH /*FALLTHROUGH*/
case 12:
coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[11], coefs2, 3);
FALLTHROUGH /*FALLTHROUGH*/
case 11:
coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[10], coefs2, 2);
FALLTHROUGH /*FALLTHROUGH*/
case 10:
coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[9], coefs2, 1);
FALLTHROUGH /*FALLTHROUGH*/
case 9:
coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[8], coefs2, 0);
FALLTHROUGH /*FALLTHROUGH*/
default:
break;
}
/* Compute and store data for signbits bitmap. */
uint8x8_t sign_coefs1 =
vmovn_u16(vreinterpretq_u16_s16(vshrq_n_s16(coefs1, 15)));
uint8x8_t sign_coefs2 =
vmovn_u16(vreinterpretq_u16_s16(vshrq_n_s16(coefs2, 15)));
vst1_u8(coef_sign_bits_ptr, sign_coefs1);
vst1_u8(coef_sign_bits_ptr + DCTSIZE, sign_coefs2);
/* Compute absolute value of coefficients and apply point transform Al. */
int16x8_t abs_coefs1 = vabsq_s16(coefs1);
int16x8_t abs_coefs2 = vabsq_s16(coefs2);
coefs1 = vshlq_s16(abs_coefs1, vdupq_n_s16(-Al));
coefs2 = vshlq_s16(abs_coefs2, vdupq_n_s16(-Al));
vst1q_s16(absvalues_ptr, coefs1);
vst1q_s16(absvalues_ptr + DCTSIZE, coefs2);
/* Test whether transformed coefficient values == 1 (used to find EOB
* position.)
*/
uint8x8_t coefs_eq11 = vmovn_u16(vceqq_s16(coefs1, vdupq_n_s16(1)));
uint8x8_t coefs_eq12 = vmovn_u16(vceqq_s16(coefs2, vdupq_n_s16(1)));
vst1_u8(eq1_bits_ptr, coefs_eq11);
vst1_u8(eq1_bits_ptr + DCTSIZE, coefs_eq12);
absvalues_ptr += 16;
coef_sign_bits_ptr += 16;
eq1_bits_ptr += 16;
jpeg_natural_order_start += 16;
rows_to_zero -= 2;
} else if (remaining_coefs > 0) {
int16x8_t coefs = vdupq_n_s16(0);
switch (remaining_coefs) {
case 8:
coefs = vld1q_lane_s16(block + jpeg_natural_order_start[7], coefs, 7);
FALLTHROUGH /*FALLTHROUGH*/
case 7:
coefs = vld1q_lane_s16(block + jpeg_natural_order_start[6], coefs, 6);
FALLTHROUGH /*FALLTHROUGH*/
case 6:
coefs = vld1q_lane_s16(block + jpeg_natural_order_start[5], coefs, 5);
FALLTHROUGH /*FALLTHROUGH*/
case 5:
coefs = vld1q_lane_s16(block + jpeg_natural_order_start[4], coefs, 4);
FALLTHROUGH /*FALLTHROUGH*/
case 4:
coefs = vld1q_lane_s16(block + jpeg_natural_order_start[3], coefs, 3);
FALLTHROUGH /*FALLTHROUGH*/
case 3:
coefs = vld1q_lane_s16(block + jpeg_natural_order_start[2], coefs, 2);
FALLTHROUGH /*FALLTHROUGH*/
case 2:
coefs = vld1q_lane_s16(block + jpeg_natural_order_start[1], coefs, 1);
FALLTHROUGH /*FALLTHROUGH*/
case 1:
coefs = vld1q_lane_s16(block + jpeg_natural_order_start[0], coefs, 0);
FALLTHROUGH /*FALLTHROUGH*/
default:
break;
}
/* Compute and store data for signbits bitmap. */
uint8x8_t sign_coefs =
vmovn_u16(vreinterpretq_u16_s16(vshrq_n_s16(coefs, 15)));
vst1_u8(coef_sign_bits_ptr, sign_coefs);
/* Compute absolute value of coefficients and apply point transform Al. */
int16x8_t abs_coefs = vabsq_s16(coefs);
coefs = vshlq_s16(abs_coefs, vdupq_n_s16(-Al));
vst1q_s16(absvalues_ptr, coefs);
/* Test whether transformed coefficient values == 1 (used to find EOB
* position.)
*/
uint8x8_t coefs_eq1 = vmovn_u16(vceqq_s16(coefs, vdupq_n_s16(1)));
vst1_u8(eq1_bits_ptr, coefs_eq1);
absvalues_ptr += 8;
coef_sign_bits_ptr += 8;
eq1_bits_ptr += 8;
rows_to_zero--;
}
/* Zero remaining memory in blocks. */
for (i = 0; i < rows_to_zero; i++) {
vst1q_s16(absvalues_ptr, vdupq_n_s16(0));
vst1_u8(coef_sign_bits_ptr, vdup_n_u8(0));
vst1_u8(eq1_bits_ptr, vdup_n_u8(0));
absvalues_ptr += 8;
coef_sign_bits_ptr += 8;
eq1_bits_ptr += 8;
}
/* Construct zerobits bitmap. */
int16x8_t abs_row0 = vld1q_s16(absvalues + 0 * DCTSIZE);
int16x8_t abs_row1 = vld1q_s16(absvalues + 1 * DCTSIZE);
int16x8_t abs_row2 = vld1q_s16(absvalues + 2 * DCTSIZE);
int16x8_t abs_row3 = vld1q_s16(absvalues + 3 * DCTSIZE);
int16x8_t abs_row4 = vld1q_s16(absvalues + 4 * DCTSIZE);
int16x8_t abs_row5 = vld1q_s16(absvalues + 5 * DCTSIZE);
int16x8_t abs_row6 = vld1q_s16(absvalues + 6 * DCTSIZE);
int16x8_t abs_row7 = vld1q_s16(absvalues + 7 * DCTSIZE);
uint8x8_t abs_row0_eq0 = vmovn_u16(vceqq_s16(abs_row0, vdupq_n_s16(0)));
uint8x8_t abs_row1_eq0 = vmovn_u16(vceqq_s16(abs_row1, vdupq_n_s16(0)));
uint8x8_t abs_row2_eq0 = vmovn_u16(vceqq_s16(abs_row2, vdupq_n_s16(0)));
uint8x8_t abs_row3_eq0 = vmovn_u16(vceqq_s16(abs_row3, vdupq_n_s16(0)));
uint8x8_t abs_row4_eq0 = vmovn_u16(vceqq_s16(abs_row4, vdupq_n_s16(0)));
uint8x8_t abs_row5_eq0 = vmovn_u16(vceqq_s16(abs_row5, vdupq_n_s16(0)));
uint8x8_t abs_row6_eq0 = vmovn_u16(vceqq_s16(abs_row6, vdupq_n_s16(0)));
uint8x8_t abs_row7_eq0 = vmovn_u16(vceqq_s16(abs_row7, vdupq_n_s16(0)));
/* { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80 } */
const uint8x8_t bitmap_mask =
vreinterpret_u8_u64(vmov_n_u64(0x8040201008040201));
abs_row0_eq0 = vand_u8(abs_row0_eq0, bitmap_mask);
abs_row1_eq0 = vand_u8(abs_row1_eq0, bitmap_mask);
abs_row2_eq0 = vand_u8(abs_row2_eq0, bitmap_mask);
abs_row3_eq0 = vand_u8(abs_row3_eq0, bitmap_mask);
abs_row4_eq0 = vand_u8(abs_row4_eq0, bitmap_mask);
abs_row5_eq0 = vand_u8(abs_row5_eq0, bitmap_mask);
abs_row6_eq0 = vand_u8(abs_row6_eq0, bitmap_mask);
abs_row7_eq0 = vand_u8(abs_row7_eq0, bitmap_mask);
uint8x8_t bitmap_rows_01 = vpadd_u8(abs_row0_eq0, abs_row1_eq0);
uint8x8_t bitmap_rows_23 = vpadd_u8(abs_row2_eq0, abs_row3_eq0);
uint8x8_t bitmap_rows_45 = vpadd_u8(abs_row4_eq0, abs_row5_eq0);
uint8x8_t bitmap_rows_67 = vpadd_u8(abs_row6_eq0, abs_row7_eq0);
uint8x8_t bitmap_rows_0123 = vpadd_u8(bitmap_rows_01, bitmap_rows_23);
uint8x8_t bitmap_rows_4567 = vpadd_u8(bitmap_rows_45, bitmap_rows_67);
uint8x8_t bitmap_all = vpadd_u8(bitmap_rows_0123, bitmap_rows_4567);
#if defined(__aarch64__) || defined(_M_ARM64)
/* Move bitmap to a 64-bit scalar register. */
uint64_t bitmap = vget_lane_u64(vreinterpret_u64_u8(bitmap_all), 0);
/* Store zerobits bitmap. */
bits[0] = ~bitmap;
#else
/* Move bitmap to two 32-bit scalar registers. */
uint32_t bitmap0 = vget_lane_u32(vreinterpret_u32_u8(bitmap_all), 0);
uint32_t bitmap1 = vget_lane_u32(vreinterpret_u32_u8(bitmap_all), 1);
/* Store zerobits bitmap. */
bits[0] = ~bitmap0;
bits[1] = ~bitmap1;
#endif
/* Construct signbits bitmap. */
uint8x8_t signbits_row0 = vld1_u8(coef_sign_bits + 0 * DCTSIZE);
uint8x8_t signbits_row1 = vld1_u8(coef_sign_bits + 1 * DCTSIZE);
uint8x8_t signbits_row2 = vld1_u8(coef_sign_bits + 2 * DCTSIZE);
uint8x8_t signbits_row3 = vld1_u8(coef_sign_bits + 3 * DCTSIZE);
uint8x8_t signbits_row4 = vld1_u8(coef_sign_bits + 4 * DCTSIZE);
uint8x8_t signbits_row5 = vld1_u8(coef_sign_bits + 5 * DCTSIZE);
uint8x8_t signbits_row6 = vld1_u8(coef_sign_bits + 6 * DCTSIZE);
uint8x8_t signbits_row7 = vld1_u8(coef_sign_bits + 7 * DCTSIZE);
signbits_row0 = vand_u8(signbits_row0, bitmap_mask);
signbits_row1 = vand_u8(signbits_row1, bitmap_mask);
signbits_row2 = vand_u8(signbits_row2, bitmap_mask);
signbits_row3 = vand_u8(signbits_row3, bitmap_mask);
signbits_row4 = vand_u8(signbits_row4, bitmap_mask);
signbits_row5 = vand_u8(signbits_row5, bitmap_mask);
signbits_row6 = vand_u8(signbits_row6, bitmap_mask);
signbits_row7 = vand_u8(signbits_row7, bitmap_mask);
bitmap_rows_01 = vpadd_u8(signbits_row0, signbits_row1);
bitmap_rows_23 = vpadd_u8(signbits_row2, signbits_row3);
bitmap_rows_45 = vpadd_u8(signbits_row4, signbits_row5);
bitmap_rows_67 = vpadd_u8(signbits_row6, signbits_row7);
bitmap_rows_0123 = vpadd_u8(bitmap_rows_01, bitmap_rows_23);
bitmap_rows_4567 = vpadd_u8(bitmap_rows_45, bitmap_rows_67);
bitmap_all = vpadd_u8(bitmap_rows_0123, bitmap_rows_4567);
#if defined(__aarch64__) || defined(_M_ARM64)
/* Move bitmap to a 64-bit scalar register. */
bitmap = vget_lane_u64(vreinterpret_u64_u8(bitmap_all), 0);
/* Store signbits bitmap. */
bits[1] = ~bitmap;
#else
/* Move bitmap to two 32-bit scalar registers. */
bitmap0 = vget_lane_u32(vreinterpret_u32_u8(bitmap_all), 0);
bitmap1 = vget_lane_u32(vreinterpret_u32_u8(bitmap_all), 1);
/* Store signbits bitmap. */
bits[2] = ~bitmap0;
bits[3] = ~bitmap1;
#endif
/* Construct bitmap to find EOB position (the index of the last coefficient
* equal to 1.)
*/
uint8x8_t row0_eq1 = vld1_u8(coef_eq1_bits + 0 * DCTSIZE);
uint8x8_t row1_eq1 = vld1_u8(coef_eq1_bits + 1 * DCTSIZE);
uint8x8_t row2_eq1 = vld1_u8(coef_eq1_bits + 2 * DCTSIZE);
uint8x8_t row3_eq1 = vld1_u8(coef_eq1_bits + 3 * DCTSIZE);
uint8x8_t row4_eq1 = vld1_u8(coef_eq1_bits + 4 * DCTSIZE);
uint8x8_t row5_eq1 = vld1_u8(coef_eq1_bits + 5 * DCTSIZE);
uint8x8_t row6_eq1 = vld1_u8(coef_eq1_bits + 6 * DCTSIZE);
uint8x8_t row7_eq1 = vld1_u8(coef_eq1_bits + 7 * DCTSIZE);
row0_eq1 = vand_u8(row0_eq1, bitmap_mask);
row1_eq1 = vand_u8(row1_eq1, bitmap_mask);
row2_eq1 = vand_u8(row2_eq1, bitmap_mask);
row3_eq1 = vand_u8(row3_eq1, bitmap_mask);
row4_eq1 = vand_u8(row4_eq1, bitmap_mask);
row5_eq1 = vand_u8(row5_eq1, bitmap_mask);
row6_eq1 = vand_u8(row6_eq1, bitmap_mask);
row7_eq1 = vand_u8(row7_eq1, bitmap_mask);
bitmap_rows_01 = vpadd_u8(row0_eq1, row1_eq1);
bitmap_rows_23 = vpadd_u8(row2_eq1, row3_eq1);
bitmap_rows_45 = vpadd_u8(row4_eq1, row5_eq1);
bitmap_rows_67 = vpadd_u8(row6_eq1, row7_eq1);
bitmap_rows_0123 = vpadd_u8(bitmap_rows_01, bitmap_rows_23);
bitmap_rows_4567 = vpadd_u8(bitmap_rows_45, bitmap_rows_67);
bitmap_all = vpadd_u8(bitmap_rows_0123, bitmap_rows_4567);
#if defined(__aarch64__) || defined(_M_ARM64)
/* Move bitmap to a 64-bit scalar register. */
bitmap = vget_lane_u64(vreinterpret_u64_u8(bitmap_all), 0);
/* Return EOB position. */
if (bitmap == 0) {
/* EOB position is defined to be 0 if all coefficients != 1. */
return 0;
} else {
return 63 - BUILTIN_CLZLL(bitmap);
}
#else
/* Move bitmap to two 32-bit scalar registers. */
bitmap0 = vget_lane_u32(vreinterpret_u32_u8(bitmap_all), 0);
bitmap1 = vget_lane_u32(vreinterpret_u32_u8(bitmap_all), 1);
/* Return EOB position. */
if (bitmap0 == 0 && bitmap1 == 0) {
return 0;
} else if (bitmap1 != 0) {
return 63 - BUILTIN_CLZ(bitmap1);
} else {
return 31 - BUILTIN_CLZ(bitmap0);
}
#endif
}