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Merge "vpx_dsp: get32x32var_avx2() cleanup"

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Scott LaVarnway 2017-08-23 19:59:25 +00:00 committed by Gerrit Code Review
commit 1aad50c092
1 changed files with 35 additions and 59 deletions
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94
vpx_dsp/x86/variance_avx2.c
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@ -100,43 +100,30 @@ void vpx_get16x16var_avx2(const unsigned char *src_ptr, int source_stride,
}
}
static void get32x32var_avx2(const unsigned char *src_ptr, int source_stride,
static void get32x16var_avx2(const unsigned char *src_ptr, int source_stride,
const unsigned char *ref_ptr, int recon_stride,
unsigned int *sse, int *sum) {
__m256i src, src_expand_lo, src_expand_hi, ref, ref_expand_lo;
__m256i ref_expand_hi, madd_lo, madd_hi;
unsigned int i;
__m256i zero_reg = _mm256_setzero_si256();
const __m256i zero_reg = _mm256_setzero_si256();
__m256i sum_ref_src = _mm256_setzero_si256();
__m256i madd_ref_src = _mm256_setzero_si256();
// processing 32 elements in parallel
for (i = 0; i < 16; i++) {
src = _mm256_loadu_si256((__m256i const *)(src_ptr));
ref = _mm256_loadu_si256((__m256i const *)(ref_ptr));
// expanding to 16 bit each lane
src_expand_lo = _mm256_unpacklo_epi8(src, zero_reg);
src_expand_hi = _mm256_unpackhi_epi8(src, zero_reg);
ref_expand_lo = _mm256_unpacklo_epi8(ref, zero_reg);
ref_expand_hi = _mm256_unpackhi_epi8(ref, zero_reg);
// src-ref
src_expand_lo = _mm256_sub_epi16(src_expand_lo, ref_expand_lo);
src_expand_hi = _mm256_sub_epi16(src_expand_hi, ref_expand_hi);
// madd low (src - ref)
madd_lo = _mm256_madd_epi16(src_expand_lo, src_expand_lo);
const __m256i src = _mm256_loadu_si256((__m256i const *)(src_ptr));
const __m256i ref = _mm256_loadu_si256((__m256i const *)(ref_ptr));
const __m256i src_lo = _mm256_unpacklo_epi8(src, zero_reg);
const __m256i src_hi = _mm256_unpackhi_epi8(src, zero_reg);
const __m256i ref_lo = _mm256_unpacklo_epi8(ref, zero_reg);
const __m256i ref_hi = _mm256_unpackhi_epi8(ref, zero_reg);
const __m256i diff_lo = _mm256_sub_epi16(src_lo, ref_lo);
const __m256i diff_hi = _mm256_sub_epi16(src_hi, ref_hi);
const __m256i madd_lo = _mm256_madd_epi16(diff_lo, diff_lo);
const __m256i madd_hi = _mm256_madd_epi16(diff_hi, diff_hi);
// add high to low
src_expand_lo = _mm256_add_epi16(src_expand_lo, src_expand_hi);
const __m256i diff_sum = _mm256_add_epi16(diff_lo, diff_hi);
// madd high (src - ref)
madd_hi = _mm256_madd_epi16(src_expand_hi, src_expand_hi);
sum_ref_src = _mm256_add_epi16(sum_ref_src, src_expand_lo);
sum_ref_src = _mm256_add_epi16(sum_ref_src, diff_sum);
// add high to low
madd_ref_src =
@ -147,37 +134,26 @@ static void get32x32var_avx2(const unsigned char *src_ptr, int source_stride,
}
{
__m256i expand_sum_low, expand_sum_high, expand_sum;
__m256i expand_madd_lo, expand_madd_hi, expand_madd;
__m256i ex_expand_sum_low, ex_expand_sum_high, ex_expand_sum;
// padding each 2 bytes with another 2 zeroed bytes
expand_sum_low = _mm256_unpacklo_epi16(zero_reg, sum_ref_src);
expand_sum_high = _mm256_unpackhi_epi16(zero_reg, sum_ref_src);
// shifting the sign 16 bits right
expand_sum_low = _mm256_srai_epi32(expand_sum_low, 16);
expand_sum_high = _mm256_srai_epi32(expand_sum_high, 16);
expand_sum = _mm256_add_epi32(expand_sum_low, expand_sum_high);
// expand each 32 bits of the madd result to 64 bits
expand_madd_lo = _mm256_unpacklo_epi32(madd_ref_src, zero_reg);
expand_madd_hi = _mm256_unpackhi_epi32(madd_ref_src, zero_reg);
expand_madd = _mm256_add_epi32(expand_madd_lo, expand_madd_hi);
ex_expand_sum_low = _mm256_unpacklo_epi32(expand_sum, zero_reg);
ex_expand_sum_high = _mm256_unpackhi_epi32(expand_sum, zero_reg);
ex_expand_sum = _mm256_add_epi32(ex_expand_sum_low, ex_expand_sum_high);
// 16 -> 32 sign extended
const __m256i sum_lo =
_mm256_srai_epi32(_mm256_unpacklo_epi16(zero_reg, sum_ref_src), 16);
// 16 -> 32 sign extended
const __m256i sum_hi =
_mm256_srai_epi32(_mm256_unpackhi_epi16(zero_reg, sum_ref_src), 16);
const __m256i sum_hl = _mm256_add_epi32(sum_lo, sum_hi);
const __m256i madd_lo = _mm256_unpacklo_epi32(madd_ref_src, zero_reg);
const __m256i madd_hi = _mm256_unpackhi_epi32(madd_ref_src, zero_reg);
const __m256i madd = _mm256_add_epi32(madd_lo, madd_hi);
const __m256i ex_sum_lo = _mm256_unpacklo_epi32(sum_hl, zero_reg);
const __m256i ex_sum_hi = _mm256_unpackhi_epi32(sum_hl, zero_reg);
const __m256i ex_sum = _mm256_add_epi32(ex_sum_lo, ex_sum_hi);
// shift 8 bytes eight
madd_ref_src = _mm256_srli_si256(expand_madd, 8);
sum_ref_src = _mm256_srli_si256(ex_expand_sum, 8);
madd_ref_src = _mm256_srli_si256(madd, 8);
sum_ref_src = _mm256_srli_si256(ex_sum, 8);
madd_ref_src = _mm256_add_epi32(madd_ref_src, expand_madd);
sum_ref_src = _mm256_add_epi32(sum_ref_src, ex_expand_sum);
madd_ref_src = _mm256_add_epi32(madd_ref_src, madd);
sum_ref_src = _mm256_add_epi32(sum_ref_src, ex_sum);
// extract the low lane and the high lane and add the results
*((int *)sse) =
@ -663,7 +639,7 @@ unsigned int vpx_variance32x16_avx2(const uint8_t *src, int src_stride,
unsigned int *sse) {
int sum;
variance_avx2(src, src_stride, ref, ref_stride, 32, 16, sse, &sum,
get32x32var_avx2, 32);
get32x16var_avx2, 32);
return *sse - (uint32_t)(((int64_t)sum * sum) >> 9);
}
@ -672,7 +648,7 @@ unsigned int vpx_variance32x32_avx2(const uint8_t *src, int src_stride,
unsigned int *sse) {
int sum;
variance_avx2(src, src_stride, ref, ref_stride, 32, 32, sse, &sum,
get32x32var_avx2, 32);
get32x16var_avx2, 32);
return *sse - (uint32_t)(((int64_t)sum * sum) >> 10);
}
@ -681,7 +657,7 @@ unsigned int vpx_variance64x64_avx2(const uint8_t *src, int src_stride,
unsigned int *sse) {
int sum;
variance_avx2(src, src_stride, ref, ref_stride, 64, 64, sse, &sum,
get32x32var_avx2, 32);
get32x16var_avx2, 32);
return *sse - (uint32_t)(((int64_t)sum * sum) >> 12);
}
@ -690,7 +666,7 @@ unsigned int vpx_variance64x32_avx2(const uint8_t *src, int src_stride,
unsigned int *sse) {
int sum;
variance_avx2(src, src_stride, ref, ref_stride, 64, 32, sse, &sum,
get32x32var_avx2, 32);
get32x16var_avx2, 32);
return *sse - (uint32_t)(((int64_t)sum * sum) >> 11);
}