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dec_neon: add LD4 intra predictor

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based on SSE2 version, ~55% faster

Change-Id: I782282ffc31dcf238890b3ba0decccf1d793dad0
This commit is contained in:
James Zern
2014-10-22 20:43:36 +02:00
parent 32de385eca
commit fe395f0e4d
1 changed files with 20 additions and 0 deletions
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20
src/dsp/dec_neon.c
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@@ -1277,6 +1277,25 @@ static void VE4(uint8_t* dst) { // vertical
}
}
static void LD4(uint8_t* dst) { // Down-left
// Note using the same shift trick as VE4() is slower here.
const uint8x8_t ABCDEFGH = vld1_u8(dst - BPS + 0);
const uint8x8_t BCDEFGH0 = vld1_u8(dst - BPS + 1);
const uint8x8_t CDEFGH00 = vld1_u8(dst - BPS + 2);
const uint8x8_t CDEFGHH0 = vset_lane_u8(dst[-BPS + 7], CDEFGH00, 6);
const uint8x8_t avg1 = vhadd_u8(ABCDEFGH, CDEFGHH0);
const uint8x8_t avg2 = vrhadd_u8(avg1, BCDEFGH0);
const uint64x1_t avg2_u64 = vreinterpret_u64_u8(avg2);
const uint32x2_t r0 = vreinterpret_u32_u8(avg2);
const uint32x2_t r1 = vreinterpret_u32_u64(vshr_n_u64(avg2_u64, 8));
const uint32x2_t r2 = vreinterpret_u32_u64(vshr_n_u64(avg2_u64, 16));
const uint32x2_t r3 = vreinterpret_u32_u64(vshr_n_u64(avg2_u64, 24));
vst1_lane_u32((uint32_t*)(dst + 0 * BPS), r0, 0);
vst1_lane_u32((uint32_t*)(dst + 1 * BPS), r1, 0);
vst1_lane_u32((uint32_t*)(dst + 2 * BPS), r2, 0);
vst1_lane_u32((uint32_t*)(dst + 3 * BPS), r3, 0);
}
#endif // WEBP_USE_NEON
//------------------------------------------------------------------------------
@@ -1309,5 +1328,6 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8DspInitNEON(void) {
VP8SimpleHFilter16i = SimpleHFilter16i;
VP8PredLuma4[2] = VE4;
VP8PredLuma4[6] = LD4;
#endif // WEBP_USE_NEON
}