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dec_neon: add DC8uvNoTop / DC8uvNoLeft

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adds do_top/do_left flags to DC8uv; ~88% / ~92% faster respectively
no change in DC8uv speed.

Change-Id: I109ec4d9ad13c9db64516e98ed4693a21a3e9b54
This commit is contained in:
James Zern 2014-12-22 15:46:17 -05:00
parent d8340da756
commit 14108d7878
1 changed files with 52 additions and 26 deletions
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78
src/dsp/dec_neon.c
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@ -1389,35 +1389,59 @@ 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 WEBP_INLINE void DC8(uint8_t* dst, int do_top, int do_left) {
uint16x8_t sum_top;
uint16x8_t sum_left;
uint8x8_t dc0;
if (do_top) {
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);
sum_top = vcombine_u16(p2, p2);
}
if (do_left) {
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);
sum_left = vaddq_u16(s01, s23);
}
if (do_top && do_left) {
const uint16x8_t sum = vaddq_u16(sum_left, sum_top);
dc0 = vrshrn_n_u16(sum, 4);
} else if (do_top) {
dc0 = vrshrn_n_u16(sum_top, 3);
} else {
dc0 = vrshrn_n_u16(sum_left, 3);
}
{
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 DC8uv(uint8_t* dst) { return DC8(dst, 1, 1); }
static void DC8uvNoTop(uint8_t* dst) { return DC8(dst, 0, 1); }
static void DC8uvNoLeft(uint8_t* dst) { return DC8(dst, 1, 0); }
static void TM8uv(uint8_t* dst) { return TrueMotion(dst, 8); }
#endif // WEBP_USE_NEON
@ -1459,5 +1483,7 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8DspInitNEON(void) {
VP8PredChroma8[0] = DC8uv;
VP8PredChroma8[1] = TM8uv;
VP8PredChroma8[4] = DC8uvNoTop;
VP8PredChroma8[5] = DC8uvNoLeft;
#endif // WEBP_USE_NEON
}