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dec_neon: add DC8uv

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~87% faster.

Change-Id: I73fe77437792f1361ce8ab0b411132c6ec0fa021
This commit is contained in:
James Zern 2014-12-22 14:36:45 -05:00
parent 87c3d53180
commit d8340da756
1 changed files with 30 additions and 0 deletions
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30
src/dsp/dec_neon.c
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@ -1389,6 +1389,35 @@ static void LD4(uint8_t* dst) { // Down-left
//------------------------------------------------------------------------------
// Chroma
static void DC8uv(uint8_t* dst) { // DC
const uint8x8_t A = vld1_u8(dst - BPS); // top row
const uint16x4_t p0 = vpaddl_u8(A); // cascading summation of the top
const uint16x4_t p1 = vpadd_u16(p0, p0);
const uint16x4_t p2 = vpadd_u16(p1, p1);
const uint16x8_t L0 = vmovl_u8(vld1_u8(dst + 0 * BPS - 1));
const uint16x8_t L1 = vmovl_u8(vld1_u8(dst + 1 * BPS - 1));
const uint16x8_t L2 = vmovl_u8(vld1_u8(dst + 2 * BPS - 1));
const uint16x8_t L3 = vmovl_u8(vld1_u8(dst + 3 * BPS - 1));
const uint16x8_t L4 = vmovl_u8(vld1_u8(dst + 4 * BPS - 1));
const uint16x8_t L5 = vmovl_u8(vld1_u8(dst + 5 * BPS - 1));
const uint16x8_t L6 = vmovl_u8(vld1_u8(dst + 6 * BPS - 1));
const uint16x8_t L7 = vmovl_u8(vld1_u8(dst + 7 * BPS - 1));
const uint16x8_t s0 = vaddq_u16(L0, L1);
const uint16x8_t s1 = vaddq_u16(L2, L3);
const uint16x8_t s2 = vaddq_u16(L4, L5);
const uint16x8_t s3 = vaddq_u16(L6, L7);
const uint16x8_t s01 = vaddq_u16(s0, s1);
const uint16x8_t s23 = vaddq_u16(s2, s3);
const uint16x8_t s0123 = vaddq_u16(s01, s23);
const uint16x8_t sum = vaddq_u16(s0123, vcombine_u16(p2, p2));
const uint8x8_t dc0 = vrshrn_n_u16(sum, 4); // (sum + 8) >> 4
const uint8x8_t dc = vdup_lane_u8(dc0, 0);
int i;
for (i = 0; i < 8; ++i) {
vst1_u32((uint32_t*)(dst + i * BPS), vreinterpret_u32_u8(dc));
}
}
static void TM8uv(uint8_t* dst) { return TrueMotion(dst, 8); }
#endif // WEBP_USE_NEON
@ -1428,6 +1457,7 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8DspInitNEON(void) {
VP8PredLuma4[4] = RD4;
VP8PredLuma4[6] = LD4;
VP8PredChroma8[0] = DC8uv;
VP8PredChroma8[1] = TM8uv;
#endif // WEBP_USE_NEON
}