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~2% faster predictor #10 for NEON

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Change-Id: Icd9cff90c227d702c3ba319131996c5475094520
This commit is contained in:
Pascal Massimino 2016-12-06 11:17:04 +01:00
parent d4b7d801db
commit fbfb3bef7b
1 changed files with 7 additions and 6 deletions
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13
src/dsp/lossless_neon.c
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@ -287,6 +287,8 @@ GENERATE_PREDICTOR_2(9, upper[i + 1])
static void PredictorAdd10_NEON(const uint32_t* in, const uint32_t* upper,
int num_pixels, uint32_t* out) {
int i, j;
const uint8x16_t zero = vdupq_n_u8(0);
uint8x16_t L = LOADQ_U32_AS_U8(out[-1]);
for (i = 0; i + 4 <= num_pixels; i += 4) {
uint8x16_t src = LOADQ_U32P_AS_U8(&in[i]);
uint8x16_t TL = LOADQ_U32P_AS_U8(&upper[i - 1]);
@ -294,15 +296,14 @@ static void PredictorAdd10_NEON(const uint32_t* in, const uint32_t* upper,
const uint8x16_t TR = LOADQ_U32P_AS_U8(&upper[i + 1]);
uint8x16_t avgTTR = vhaddq_u8(T, TR);
for (j = 0; j < 4; ++j) {
const uint8x16_t L = LOADQ_U32_AS_U8(out[i + j - 1]);
const uint8x16_t avgLTL = vhaddq_u8(L, TL);
const uint8x16_t avg = vhaddq_u8(avgTTR, avgLTL);
const uint8x16_t res = vaddq_u8(avg, src);
out[i + j] = GETQ_U8_AS_U32(res);
L = vaddq_u8(avg, src); // result is the next 'left'
out[i + j] = GETQ_U8_AS_U32(L);
// Rotate the pre-computed values for the next iteration.
avgTTR = vextq_u8(avgTTR, avgTTR, 4);
TL = vextq_u8(TL, TL, 4);
src = vextq_u8(src, src, 4);
avgTTR = vextq_u8(avgTTR, zero, 4);
TL = vextq_u8(TL, zero, 4);
src = vextq_u8(src, zero, 4);
}
}
VP8LPredictorsAdd_C[10](in + i, upper + i, num_pixels - i, out + i);