ref: d00e68ad8789dc8bb210961532e20f0e9f6d55ae
dir: /vpx_dsp/arm/variance_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 <assert.h>
#include "./vpx_dsp_rtcd.h"
#include "./vpx_config.h"
#include "vpx/vpx_integer.h"
#include "vpx_dsp/arm/mem_neon.h"
#include "vpx_dsp/arm/sum_neon.h"
#include "vpx_ports/mem.h"
#if defined(__ARM_FEATURE_DOTPROD) && (__ARM_FEATURE_DOTPROD == 1)
// Process a block of width 4 four rows at a time.
static void variance_neon_w4x4(const uint8_t *src_ptr, int src_stride,
const uint8_t *ref_ptr, int ref_stride, int h,
uint32_t *sse, int *sum) {
int i;
uint32x4_t sum_a = vdupq_n_u32(0);
uint32x4_t sum_b = vdupq_n_u32(0);
uint32x4_t sse_u32 = vdupq_n_u32(0);
for (i = 0; i < h; i += 4) {
const uint8x16_t a = load_unaligned_u8q(src_ptr, src_stride);
const uint8x16_t b = load_unaligned_u8q(ref_ptr, ref_stride);
const uint8x16_t abs_diff = vabdq_u8(a, b);
sse_u32 = vdotq_u32(sse_u32, abs_diff, abs_diff);
sum_a = vdotq_u32(sum_a, a, vdupq_n_u8(1));
sum_b = vdotq_u32(sum_b, b, vdupq_n_u8(1));
src_ptr += 4 * src_stride;
ref_ptr += 4 * ref_stride;
}
*sum = horizontal_add_int32x4(vreinterpretq_s32_u32(vsubq_u32(sum_a, sum_b)));
*sse = horizontal_add_uint32x4(sse_u32);
}
// Process a block of any size where the width is divisible by 16.
static void variance_neon_w16(const uint8_t *src_ptr, int src_stride,
const uint8_t *ref_ptr, int ref_stride, int w,
int h, uint32_t *sse, int *sum) {
int i, j;
uint32x4_t sum_a = vdupq_n_u32(0);
uint32x4_t sum_b = vdupq_n_u32(0);
uint32x4_t sse_u32 = vdupq_n_u32(0);
for (i = 0; i < h; ++i) {
for (j = 0; j < w; j += 16) {
const uint8x16_t a = vld1q_u8(src_ptr + j);
const uint8x16_t b = vld1q_u8(ref_ptr + j);
const uint8x16_t abs_diff = vabdq_u8(a, b);
sse_u32 = vdotq_u32(sse_u32, abs_diff, abs_diff);
sum_a = vdotq_u32(sum_a, a, vdupq_n_u8(1));
sum_b = vdotq_u32(sum_b, b, vdupq_n_u8(1));
}
src_ptr += src_stride;
ref_ptr += ref_stride;
}
*sum = horizontal_add_int32x4(vreinterpretq_s32_u32(vsubq_u32(sum_a, sum_b)));
*sse = horizontal_add_uint32x4(sse_u32);
}
// Process a block of width 8 two rows at a time.
static void variance_neon_w8x2(const uint8_t *src_ptr, int src_stride,
const uint8_t *ref_ptr, int ref_stride, int h,
uint32_t *sse, int *sum) {
int i = 0;
uint32x2_t sum_a = vdup_n_u32(0);
uint32x2_t sum_b = vdup_n_u32(0);
uint32x2_t sse_lo_u32 = vdup_n_u32(0);
uint32x2_t sse_hi_u32 = vdup_n_u32(0);
do {
const uint8x8_t a_0 = vld1_u8(src_ptr);
const uint8x8_t a_1 = vld1_u8(src_ptr + src_stride);
const uint8x8_t b_0 = vld1_u8(ref_ptr);
const uint8x8_t b_1 = vld1_u8(ref_ptr + ref_stride);
const uint8x8_t abs_diff_0 = vabd_u8(a_0, b_0);
const uint8x8_t abs_diff_1 = vabd_u8(a_1, b_1);
sse_lo_u32 = vdot_u32(sse_lo_u32, abs_diff_0, abs_diff_0);
sse_hi_u32 = vdot_u32(sse_hi_u32, abs_diff_1, abs_diff_1);
sum_a = vdot_u32(sum_a, a_0, vdup_n_u8(1));
sum_b = vdot_u32(sum_b, b_0, vdup_n_u8(1));
sum_a = vdot_u32(sum_a, a_1, vdup_n_u8(1));
sum_b = vdot_u32(sum_b, b_1, vdup_n_u8(1));
src_ptr += src_stride + src_stride;
ref_ptr += ref_stride + ref_stride;
i += 2;
} while (i < h);
*sum = horizontal_add_int32x2(vreinterpret_s32_u32(vsub_u32(sum_a, sum_b)));
*sse = horizontal_add_uint32x2(vadd_u32(sse_lo_u32, sse_hi_u32));
}
#else
// The variance helper functions use int16_t for sum. 8 values are accumulated
// and then added (at which point they expand up to int32_t). To avoid overflow,
// there can be no more than 32767 / 255 ~= 128 values accumulated in each
// column. For a 32x32 buffer, this results in 32 / 8 = 4 values per row * 32
// rows = 128. Asserts have been added to each function to warn against reaching
// this limit.
// Process a block of width 4 four rows at a time.
static void variance_neon_w4x4(const uint8_t *src_ptr, int src_stride,
const uint8_t *ref_ptr, int ref_stride, int h,
uint32_t *sse, int *sum) {
int i;
int16x8_t sum_s16 = vdupq_n_s16(0);
int32x4_t sse_lo_s32 = vdupq_n_s32(0);
int32x4_t sse_hi_s32 = vdupq_n_s32(0);
// Since width is only 4, sum_s16 only loads a half row per loop.
assert(h <= 256);
for (i = 0; i < h; i += 4) {
const uint8x16_t a_u8 = load_unaligned_u8q(src_ptr, src_stride);
const uint8x16_t b_u8 = load_unaligned_u8q(ref_ptr, ref_stride);
const uint16x8_t diff_lo_u16 =
vsubl_u8(vget_low_u8(a_u8), vget_low_u8(b_u8));
const uint16x8_t diff_hi_u16 =
vsubl_u8(vget_high_u8(a_u8), vget_high_u8(b_u8));
const int16x8_t diff_lo_s16 = vreinterpretq_s16_u16(diff_lo_u16);
const int16x8_t diff_hi_s16 = vreinterpretq_s16_u16(diff_hi_u16);
sum_s16 = vaddq_s16(sum_s16, diff_lo_s16);
sum_s16 = vaddq_s16(sum_s16, diff_hi_s16);
sse_lo_s32 = vmlal_s16(sse_lo_s32, vget_low_s16(diff_lo_s16),
vget_low_s16(diff_lo_s16));
sse_lo_s32 = vmlal_s16(sse_lo_s32, vget_high_s16(diff_lo_s16),
vget_high_s16(diff_lo_s16));
sse_hi_s32 = vmlal_s16(sse_hi_s32, vget_low_s16(diff_hi_s16),
vget_low_s16(diff_hi_s16));
sse_hi_s32 = vmlal_s16(sse_hi_s32, vget_high_s16(diff_hi_s16),
vget_high_s16(diff_hi_s16));
src_ptr += 4 * src_stride;
ref_ptr += 4 * ref_stride;
}
*sum = horizontal_add_int16x8(sum_s16);
*sse = horizontal_add_uint32x4(
vreinterpretq_u32_s32(vaddq_s32(sse_lo_s32, sse_hi_s32)));
}
// Process a block of any size where the width is divisible by 16.
static void variance_neon_w16(const uint8_t *src_ptr, int src_stride,
const uint8_t *ref_ptr, int ref_stride, int w,
int h, uint32_t *sse, int *sum) {
int i, j;
int16x8_t sum_s16 = vdupq_n_s16(0);
int32x4_t sse_lo_s32 = vdupq_n_s32(0);
int32x4_t sse_hi_s32 = vdupq_n_s32(0);
// The loop loads 16 values at a time but doubles them up when accumulating
// into sum_s16.
assert(w / 8 * h <= 128);
for (i = 0; i < h; ++i) {
for (j = 0; j < w; j += 16) {
const uint8x16_t a_u8 = vld1q_u8(src_ptr + j);
const uint8x16_t b_u8 = vld1q_u8(ref_ptr + j);
const uint16x8_t diff_lo_u16 =
vsubl_u8(vget_low_u8(a_u8), vget_low_u8(b_u8));
const uint16x8_t diff_hi_u16 =
vsubl_u8(vget_high_u8(a_u8), vget_high_u8(b_u8));
const int16x8_t diff_lo_s16 = vreinterpretq_s16_u16(diff_lo_u16);
const int16x8_t diff_hi_s16 = vreinterpretq_s16_u16(diff_hi_u16);
sum_s16 = vaddq_s16(sum_s16, diff_lo_s16);
sum_s16 = vaddq_s16(sum_s16, diff_hi_s16);
sse_lo_s32 = vmlal_s16(sse_lo_s32, vget_low_s16(diff_lo_s16),
vget_low_s16(diff_lo_s16));
sse_lo_s32 = vmlal_s16(sse_lo_s32, vget_high_s16(diff_lo_s16),
vget_high_s16(diff_lo_s16));
sse_hi_s32 = vmlal_s16(sse_hi_s32, vget_low_s16(diff_hi_s16),
vget_low_s16(diff_hi_s16));
sse_hi_s32 = vmlal_s16(sse_hi_s32, vget_high_s16(diff_hi_s16),
vget_high_s16(diff_hi_s16));
}
src_ptr += src_stride;
ref_ptr += ref_stride;
}
*sum = horizontal_add_int16x8(sum_s16);
*sse = horizontal_add_uint32x4(
vreinterpretq_u32_s32(vaddq_s32(sse_lo_s32, sse_hi_s32)));
}
// Process a block of width 8 two rows at a time.
static void variance_neon_w8x2(const uint8_t *src_ptr, int src_stride,
const uint8_t *ref_ptr, int ref_stride, int h,
uint32_t *sse, int *sum) {
int i = 0;
int16x8_t sum_s16 = vdupq_n_s16(0);
int32x4_t sse_lo_s32 = vdupq_n_s32(0);
int32x4_t sse_hi_s32 = vdupq_n_s32(0);
// Each column has it's own accumulator entry in sum_s16.
assert(h <= 128);
do {
const uint8x8_t a_0_u8 = vld1_u8(src_ptr);
const uint8x8_t a_1_u8 = vld1_u8(src_ptr + src_stride);
const uint8x8_t b_0_u8 = vld1_u8(ref_ptr);
const uint8x8_t b_1_u8 = vld1_u8(ref_ptr + ref_stride);
const uint16x8_t diff_0_u16 = vsubl_u8(a_0_u8, b_0_u8);
const uint16x8_t diff_1_u16 = vsubl_u8(a_1_u8, b_1_u8);
const int16x8_t diff_0_s16 = vreinterpretq_s16_u16(diff_0_u16);
const int16x8_t diff_1_s16 = vreinterpretq_s16_u16(diff_1_u16);
sum_s16 = vaddq_s16(sum_s16, diff_0_s16);
sum_s16 = vaddq_s16(sum_s16, diff_1_s16);
sse_lo_s32 = vmlal_s16(sse_lo_s32, vget_low_s16(diff_0_s16),
vget_low_s16(diff_0_s16));
sse_lo_s32 = vmlal_s16(sse_lo_s32, vget_low_s16(diff_1_s16),
vget_low_s16(diff_1_s16));
sse_hi_s32 = vmlal_s16(sse_hi_s32, vget_high_s16(diff_0_s16),
vget_high_s16(diff_0_s16));
sse_hi_s32 = vmlal_s16(sse_hi_s32, vget_high_s16(diff_1_s16),
vget_high_s16(diff_1_s16));
src_ptr += src_stride + src_stride;
ref_ptr += ref_stride + ref_stride;
i += 2;
} while (i < h);
*sum = horizontal_add_int16x8(sum_s16);
*sse = horizontal_add_uint32x4(
vreinterpretq_u32_s32(vaddq_s32(sse_lo_s32, sse_hi_s32)));
}
#endif
void vpx_get8x8var_neon(const uint8_t *src_ptr, int src_stride,
const uint8_t *ref_ptr, int ref_stride,
unsigned int *sse, int *sum) {
variance_neon_w8x2(src_ptr, src_stride, ref_ptr, ref_stride, 8, sse, sum);
}
void vpx_get16x16var_neon(const uint8_t *src_ptr, int src_stride,
const uint8_t *ref_ptr, int ref_stride,
unsigned int *sse, int *sum) {
variance_neon_w16(src_ptr, src_stride, ref_ptr, ref_stride, 16, 16, sse, sum);
}
#define varianceNxM(n, m, shift) \
unsigned int vpx_variance##n##x##m##_neon( \
const uint8_t *src_ptr, int src_stride, const uint8_t *ref_ptr, \
int ref_stride, unsigned int *sse) { \
int sum; \
if (n == 4) \
variance_neon_w4x4(src_ptr, src_stride, ref_ptr, ref_stride, m, sse, \
&sum); \
else if (n == 8) \
variance_neon_w8x2(src_ptr, src_stride, ref_ptr, ref_stride, m, sse, \
&sum); \
else \
variance_neon_w16(src_ptr, src_stride, ref_ptr, ref_stride, n, m, sse, \
&sum); \
if (n * m < 16 * 16) \
return *sse - ((sum * sum) >> shift); \
else \
return *sse - (uint32_t)(((int64_t)sum * sum) >> shift); \
}
varianceNxM(4, 4, 4);
varianceNxM(4, 8, 5);
varianceNxM(8, 4, 5);
varianceNxM(8, 8, 6);
varianceNxM(8, 16, 7);
varianceNxM(16, 8, 7);
varianceNxM(16, 16, 8);
varianceNxM(16, 32, 9);
varianceNxM(32, 16, 9);
varianceNxM(32, 32, 10);
unsigned int vpx_variance32x64_neon(const uint8_t *src_ptr, int src_stride,
const uint8_t *ref_ptr, int ref_stride,
unsigned int *sse) {
int sum1, sum2;
uint32_t sse1, sse2;
variance_neon_w16(src_ptr, src_stride, ref_ptr, ref_stride, 32, 32, &sse1,
&sum1);
variance_neon_w16(src_ptr + (32 * src_stride), src_stride,
ref_ptr + (32 * ref_stride), ref_stride, 32, 32, &sse2,
&sum2);
*sse = sse1 + sse2;
sum1 += sum2;
return *sse - (unsigned int)(((int64_t)sum1 * sum1) >> 11);
}
unsigned int vpx_variance64x32_neon(const uint8_t *src_ptr, int src_stride,
const uint8_t *ref_ptr, int ref_stride,
unsigned int *sse) {
int sum1, sum2;
uint32_t sse1, sse2;
variance_neon_w16(src_ptr, src_stride, ref_ptr, ref_stride, 64, 16, &sse1,
&sum1);
variance_neon_w16(src_ptr + (16 * src_stride), src_stride,
ref_ptr + (16 * ref_stride), ref_stride, 64, 16, &sse2,
&sum2);
*sse = sse1 + sse2;
sum1 += sum2;
return *sse - (unsigned int)(((int64_t)sum1 * sum1) >> 11);
}
unsigned int vpx_variance64x64_neon(const uint8_t *src_ptr, int src_stride,
const uint8_t *ref_ptr, int ref_stride,
unsigned int *sse) {
int sum1, sum2;
uint32_t sse1, sse2;
variance_neon_w16(src_ptr, src_stride, ref_ptr, ref_stride, 64, 16, &sse1,
&sum1);
variance_neon_w16(src_ptr + (16 * src_stride), src_stride,
ref_ptr + (16 * ref_stride), ref_stride, 64, 16, &sse2,
&sum2);
sse1 += sse2;
sum1 += sum2;
variance_neon_w16(src_ptr + (16 * 2 * src_stride), src_stride,
ref_ptr + (16 * 2 * ref_stride), ref_stride, 64, 16, &sse2,
&sum2);
sse1 += sse2;
sum1 += sum2;
variance_neon_w16(src_ptr + (16 * 3 * src_stride), src_stride,
ref_ptr + (16 * 3 * ref_stride), ref_stride, 64, 16, &sse2,
&sum2);
*sse = sse1 + sse2;
sum1 += sum2;
return *sse - (unsigned int)(((int64_t)sum1 * sum1) >> 12);
}
#if defined(__ARM_FEATURE_DOTPROD) && (__ARM_FEATURE_DOTPROD == 1)
unsigned int vpx_mse16x16_neon(const unsigned char *src_ptr, int src_stride,
const unsigned char *ref_ptr, int ref_stride,
unsigned int *sse) {
int i;
uint8x16_t a[2], b[2], abs_diff[2];
uint32x4_t sse_vec[2] = { vdupq_n_u32(0), vdupq_n_u32(0) };
for (i = 0; i < 8; i++) {
a[0] = vld1q_u8(src_ptr);
src_ptr += src_stride;
a[1] = vld1q_u8(src_ptr);
src_ptr += src_stride;
b[0] = vld1q_u8(ref_ptr);
ref_ptr += ref_stride;
b[1] = vld1q_u8(ref_ptr);
ref_ptr += ref_stride;
abs_diff[0] = vabdq_u8(a[0], b[0]);
abs_diff[1] = vabdq_u8(a[1], b[1]);
sse_vec[0] = vdotq_u32(sse_vec[0], abs_diff[0], abs_diff[0]);
sse_vec[1] = vdotq_u32(sse_vec[1], abs_diff[1], abs_diff[1]);
}
*sse = horizontal_add_uint32x4(vaddq_u32(sse_vec[0], sse_vec[1]));
return horizontal_add_uint32x4(vaddq_u32(sse_vec[0], sse_vec[1]));
}
unsigned int vpx_get4x4sse_cs_neon(const unsigned char *src_ptr, int src_stride,
const unsigned char *ref_ptr,
int ref_stride) {
uint8x8_t a[4], b[4], abs_diff[4];
uint32x2_t sse = vdup_n_u32(0);
a[0] = vld1_u8(src_ptr);
src_ptr += src_stride;
b[0] = vld1_u8(ref_ptr);
ref_ptr += ref_stride;
a[1] = vld1_u8(src_ptr);
src_ptr += src_stride;
b[1] = vld1_u8(ref_ptr);
ref_ptr += ref_stride;
a[2] = vld1_u8(src_ptr);
src_ptr += src_stride;
b[2] = vld1_u8(ref_ptr);
ref_ptr += ref_stride;
a[3] = vld1_u8(src_ptr);
b[3] = vld1_u8(ref_ptr);
abs_diff[0] = vabd_u8(a[0], b[0]);
abs_diff[1] = vabd_u8(a[1], b[1]);
abs_diff[2] = vabd_u8(a[2], b[2]);
abs_diff[3] = vabd_u8(a[3], b[3]);
sse = vdot_u32(sse, abs_diff[0], abs_diff[0]);
sse = vdot_u32(sse, abs_diff[1], abs_diff[1]);
sse = vdot_u32(sse, abs_diff[2], abs_diff[2]);
sse = vdot_u32(sse, abs_diff[3], abs_diff[3]);
return vget_lane_u32(sse, 0);
}
#else
unsigned int vpx_mse16x16_neon(const unsigned char *src_ptr, int src_stride,
const unsigned char *ref_ptr, int ref_stride,
unsigned int *sse) {
int i;
uint8x16_t a[2], b[2];
int16x4_t diff_lo[4], diff_hi[4];
uint16x8_t diff[4];
int32x4_t sse_vec[4] = { vdupq_n_s32(0), vdupq_n_s32(0), vdupq_n_s32(0),
vdupq_n_s32(0) };
for (i = 0; i < 8; i++) {
a[0] = vld1q_u8(src_ptr);
src_ptr += src_stride;
a[1] = vld1q_u8(src_ptr);
src_ptr += src_stride;
b[0] = vld1q_u8(ref_ptr);
ref_ptr += ref_stride;
b[1] = vld1q_u8(ref_ptr);
ref_ptr += ref_stride;
diff[0] = vsubl_u8(vget_low_u8(a[0]), vget_low_u8(b[0]));
diff[1] = vsubl_u8(vget_high_u8(a[0]), vget_high_u8(b[0]));
diff[2] = vsubl_u8(vget_low_u8(a[1]), vget_low_u8(b[1]));
diff[3] = vsubl_u8(vget_high_u8(a[1]), vget_high_u8(b[1]));
diff_lo[0] = vreinterpret_s16_u16(vget_low_u16(diff[0]));
diff_lo[1] = vreinterpret_s16_u16(vget_low_u16(diff[1]));
sse_vec[0] = vmlal_s16(sse_vec[0], diff_lo[0], diff_lo[0]);
sse_vec[1] = vmlal_s16(sse_vec[1], diff_lo[1], diff_lo[1]);
diff_lo[2] = vreinterpret_s16_u16(vget_low_u16(diff[2]));
diff_lo[3] = vreinterpret_s16_u16(vget_low_u16(diff[3]));
sse_vec[2] = vmlal_s16(sse_vec[2], diff_lo[2], diff_lo[2]);
sse_vec[3] = vmlal_s16(sse_vec[3], diff_lo[3], diff_lo[3]);
diff_hi[0] = vreinterpret_s16_u16(vget_high_u16(diff[0]));
diff_hi[1] = vreinterpret_s16_u16(vget_high_u16(diff[1]));
sse_vec[0] = vmlal_s16(sse_vec[0], diff_hi[0], diff_hi[0]);
sse_vec[1] = vmlal_s16(sse_vec[1], diff_hi[1], diff_hi[1]);
diff_hi[2] = vreinterpret_s16_u16(vget_high_u16(diff[2]));
diff_hi[3] = vreinterpret_s16_u16(vget_high_u16(diff[3]));
sse_vec[2] = vmlal_s16(sse_vec[2], diff_hi[2], diff_hi[2]);
sse_vec[3] = vmlal_s16(sse_vec[3], diff_hi[3], diff_hi[3]);
}
sse_vec[0] = vaddq_s32(sse_vec[0], sse_vec[1]);
sse_vec[2] = vaddq_s32(sse_vec[2], sse_vec[3]);
sse_vec[0] = vaddq_s32(sse_vec[0], sse_vec[2]);
*sse = horizontal_add_uint32x4(vreinterpretq_u32_s32(sse_vec[0]));
return horizontal_add_uint32x4(vreinterpretq_u32_s32(sse_vec[0]));
}
unsigned int vpx_get4x4sse_cs_neon(const unsigned char *src_ptr, int src_stride,
const unsigned char *ref_ptr,
int ref_stride) {
uint8x8_t a[4], b[4];
int16x4_t diff_lo[4];
uint16x8_t diff[4];
int32x4_t sse;
a[0] = vld1_u8(src_ptr);
src_ptr += src_stride;
b[0] = vld1_u8(ref_ptr);
ref_ptr += ref_stride;
a[1] = vld1_u8(src_ptr);
src_ptr += src_stride;
b[1] = vld1_u8(ref_ptr);
ref_ptr += ref_stride;
a[2] = vld1_u8(src_ptr);
src_ptr += src_stride;
b[2] = vld1_u8(ref_ptr);
ref_ptr += ref_stride;
a[3] = vld1_u8(src_ptr);
b[3] = vld1_u8(ref_ptr);
diff[0] = vsubl_u8(a[0], b[0]);
diff[1] = vsubl_u8(a[1], b[1]);
diff[2] = vsubl_u8(a[2], b[2]);
diff[3] = vsubl_u8(a[3], b[3]);
diff_lo[0] = vget_low_s16(vreinterpretq_s16_u16(diff[0]));
diff_lo[1] = vget_low_s16(vreinterpretq_s16_u16(diff[1]));
diff_lo[2] = vget_low_s16(vreinterpretq_s16_u16(diff[2]));
diff_lo[3] = vget_low_s16(vreinterpretq_s16_u16(diff[3]));
sse = vmull_s16(diff_lo[0], diff_lo[0]);
sse = vmlal_s16(sse, diff_lo[1], diff_lo[1]);
sse = vmlal_s16(sse, diff_lo[2], diff_lo[2]);
sse = vmlal_s16(sse, diff_lo[3], diff_lo[3]);
return horizontal_add_uint32x4(vreinterpretq_u32_s32(sse));
}
#endif