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NEON: implement predictor #13

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~5-7% faster

Change-Id: I3361b0bbc978f3721168db15778a67337309c18a
This commit is contained in:
Pascal Massimino 2016-12-07 14:41:02 -08:00
parent 95b12a08ae
commit 76ebbfff28
1 changed files with 34 additions and 0 deletions
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34
src/dsp/lossless_neon.c
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@ -457,6 +457,39 @@ static void PredictorAdd12_NEON(const uint32_t* in, const uint32_t* upper,
}
#undef DO_PRED12
#define DO_PRED13(LANE, LOW_OR_HI) do { \
const uint8x16_t avg = vhaddq_u8(L, T); \
const uint8x16_t cmp = vcgtq_u8(TL, avg); \
const uint8x16_t TL_1 = vaddq_u8(TL, cmp); \
/* Compute half of the difference between avg and TL'. */ \
const int8x8_t diff_avg = \
vreinterpret_s8_u8(LOW_OR_HI(vhsubq_u8(avg, TL_1))); \
/* Compute the sum with avg and saturate. */ \
const int16x8_t avg_16 = vreinterpretq_s16_u16(vmovl_u8(LOW_OR_HI(avg))); \
const uint8x8_t delta = vqmovun_s16(vaddw_s8(avg_16, diff_avg)); \
const uint8x8_t res = vadd_u8(LOW_OR_HI(src), delta); \
const uint8x16_t res2 = vcombine_u8(res, res); \
vst1_lane_u32(&out[i + (LANE)], vreinterpret_u32_u8(res), (LANE) & 1); \
L = ROTATE32_LEFT(res2); \
} while (0)
static void PredictorAdd13_NEON(const uint32_t* in, const uint32_t* upper,
int num_pixels, uint32_t* out) {
int i;
uint8x16_t L = LOADQ_U32_AS_U8(out[-1]);
for (i = 0; i + 4 <= num_pixels; i += 4) {
const uint8x16_t src = LOADQ_U32P_AS_U8(&in[i]);
const uint8x16_t T = LOADQ_U32P_AS_U8(&upper[i]);
const uint8x16_t TL = LOADQ_U32P_AS_U8(&upper[i - 1]);
DO_PRED13(0, vget_low_u8);
DO_PRED13(1, vget_low_u8);
DO_PRED13(2, vget_high_u8);
DO_PRED13(3, vget_high_u8);
}
VP8LPredictorsAdd_C[13](in + i, upper + i, num_pixels - i, out + i);
}
#undef DO_PRED13
#undef LOAD_U32_AS_U8
#undef LOAD_U32P_AS_U8
#undef LOADQ_U32_AS_U8
@ -601,6 +634,7 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8LDspInitNEON(void) {
VP8LPredictorsAdd[10] = PredictorAdd10_NEON;
VP8LPredictorsAdd[11] = PredictorAdd11_NEON;
VP8LPredictorsAdd[12] = PredictorAdd12_NEON;
VP8LPredictorsAdd[13] = PredictorAdd13_NEON;
VP8LConvertBGRAToRGBA = ConvertBGRAToRGBA;
VP8LConvertBGRAToBGR = ConvertBGRAToBGR;