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dec_neon: add DC16 intra predictors

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improvement over 20M pixels:
DC16: ~77%
DC16NoTop: ~78%
DC16NoLeft: ~83%
DC16NoTopLeft: ~83%

Change-Id: I4c4ee16a8fa0eb466eee45dfa6f6bbce5ce64b99
This commit is contained in:
James Zern 2015-05-07 22:51:45 -07:00
parent 03b4f50d39
commit a6c1593645
1 changed files with 69 additions and 0 deletions
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69
src/dsp/dec_neon.c
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@ -1447,6 +1447,70 @@ static void DC8uvNoTopLeft(uint8_t* dst) { DC8(dst, 0, 0); }
static void TM8uv(uint8_t* dst) { TrueMotion(dst, 8); }
//------------------------------------------------------------------------------
// 16x16
static WEBP_INLINE void DC16(uint8_t* dst, int do_top, int do_left) {
uint16x8_t sum_top;
uint16x8_t sum_left;
uint8x8_t dc0;
if (do_top) {
const uint8x16_t A = vld1q_u8(dst - BPS); // top row
const uint16x8_t p0 = vpaddlq_u8(A); // cascading summation of the top
const uint16x4_t p1 = vadd_u16(vget_low_u16(p0), vget_high_u16(p0));
const uint16x4_t p2 = vpadd_u16(p1, p1);
const uint16x4_t p3 = vpadd_u16(p2, p2);
sum_top = vcombine_u16(p3, p3);
}
if (do_left) {
int i;
sum_left = vdupq_n_u16(0);
for (i = 0; i < 16; i += 8) {
const uint16x8_t L0 = vmovl_u8(vld1_u8(dst + (i + 0) * BPS - 1));
const uint16x8_t L1 = vmovl_u8(vld1_u8(dst + (i + 1) * BPS - 1));
const uint16x8_t L2 = vmovl_u8(vld1_u8(dst + (i + 2) * BPS - 1));
const uint16x8_t L3 = vmovl_u8(vld1_u8(dst + (i + 3) * BPS - 1));
const uint16x8_t L4 = vmovl_u8(vld1_u8(dst + (i + 4) * BPS - 1));
const uint16x8_t L5 = vmovl_u8(vld1_u8(dst + (i + 5) * BPS - 1));
const uint16x8_t L6 = vmovl_u8(vld1_u8(dst + (i + 6) * BPS - 1));
const uint16x8_t L7 = vmovl_u8(vld1_u8(dst + (i + 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 sum = vaddq_u16(s01, s23);
sum_left = vaddq_u16(sum_left, sum);
}
}
if (do_top && do_left) {
const uint16x8_t sum = vaddq_u16(sum_left, sum_top);
dc0 = vrshrn_n_u16(sum, 5);
} else if (do_top) {
dc0 = vrshrn_n_u16(sum_top, 4);
} else if (do_left) {
dc0 = vrshrn_n_u16(sum_left, 4);
} else {
dc0 = vdup_n_u8(0x80);
}
{
const uint8x16_t dc = vdupq_lane_u8(dc0, 0);
int i;
for (i = 0; i < 16; ++i) {
vst1q_u8(dst + i * BPS, dc);
}
}
}
static void DC16TopLeft(uint8_t* dst) { DC16(dst, 1, 1); }
static void DC16NoTop(uint8_t* dst) { DC16(dst, 0, 1); }
static void DC16NoLeft(uint8_t* dst) { DC16(dst, 1, 0); }
static void DC16NoTopLeft(uint8_t* dst) { DC16(dst, 0, 0); }
//------------------------------------------------------------------------------
// Entry point
@ -1481,6 +1545,11 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8DspInitNEON(void) {
VP8PredLuma4[4] = RD4;
VP8PredLuma4[6] = LD4;
VP8PredLuma16[0] = DC16TopLeft;
VP8PredLuma16[4] = DC16NoTop;
VP8PredLuma16[5] = DC16NoLeft;
VP8PredLuma16[6] = DC16NoTopLeft;
VP8PredChroma8[0] = DC8uv;
VP8PredChroma8[1] = TM8uv;
VP8PredChroma8[4] = DC8uvNoTop;