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dec_neon: add TM4 intra predictor

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~21% faster

Change-Id: Ia9ed4ca650f9d544821fa1faf3173611806a272a
This commit is contained in:
James Zern 2014-10-22 11:56:22 +02:00
parent fe395f0e4d
commit 79abfbd9df
1 changed files with 33 additions and 5 deletions
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38
src/dsp/dec_neon.c
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@ -389,9 +389,9 @@ static WEBP_INLINE void Store4x8x2(const uint8x16_t p1, const uint8x16_t p0,
#endif // !WORK_AROUND_GCC
// Treats 'v' as an uint8x8_t and zero extends to an int16x8_t.
static WEBP_INLINE int16x8_t ConvertU8ToS16(uint32x2_t v) {
return vreinterpretq_s16_u16(vmovl_u8(vreinterpret_u8_u32(v)));
// Zero extend 'v' to an int16x8_t.
static WEBP_INLINE int16x8_t ConvertU8ToS16(uint8x8_t v) {
return vreinterpretq_s16_u16(vmovl_u8(v));
}
// Performs unsigned 8b saturation on 'dst01' and 'dst23' storing the result
@ -423,8 +423,8 @@ static WEBP_INLINE void Add4x4(const int16x8_t row01, const int16x8_t row23,
{
// Convert to 16b.
const int16x8_t dst01_s16 = ConvertU8ToS16(dst01);
const int16x8_t dst23_s16 = ConvertU8ToS16(dst23);
const int16x8_t dst01_s16 = ConvertU8ToS16(vreinterpret_u8_u32(dst01));
const int16x8_t dst23_s16 = ConvertU8ToS16(vreinterpret_u8_u32(dst23));
// Descale with rounding.
const int16x8_t out01 = vrsraq_n_s16(dst01_s16, row01, 3);
@ -1261,6 +1261,33 @@ static void TransformAC3(const int16_t* in, uint8_t* dst) {
//------------------------------------------------------------------------------
// 4x4
static void TM4(uint8_t* dst) { // TrueMotion
const uint8x8_t TL = vdup_n_u8(dst[-BPS - 1]); // top-left pixel 'A[-1]'
const uint8x8_t T = vld1_u8(dst - BPS); // top row 'A[0..3]'
const int16x8_t d = vreinterpretq_s16_u16(vsubl_u8(T, TL)); // A[c] - A[-1]
const int16x8_t l0 = ConvertU8ToS16(vld1_u8(dst + 0 * BPS - 1)); // left edge
const int16x8_t l1 = ConvertU8ToS16(vld1_u8(dst + 1 * BPS - 1));
const int16x8_t l2 = ConvertU8ToS16(vld1_u8(dst + 2 * BPS - 1));
const int16x8_t l3 = ConvertU8ToS16(vld1_u8(dst + 3 * BPS - 1));
const int16x8_t L0 = vdupq_lane_s16(vget_low_s16(l0), 0);
const int16x8_t L1 = vdupq_lane_s16(vget_low_s16(l1), 0);
const int16x8_t L2 = vdupq_lane_s16(vget_low_s16(l2), 0);
const int16x8_t L3 = vdupq_lane_s16(vget_low_s16(l3), 0);
const int16x8_t r0 = vaddq_s16(L0, d); // L[r] + A[c] - A[-1]
const int16x8_t r1 = vaddq_s16(L1, d);
const int16x8_t r2 = vaddq_s16(L2, d);
const int16x8_t r3 = vaddq_s16(L3, d);
// Saturate and store the result.
const uint32x2_t r0_u32 = vreinterpret_u32_u8(vqmovun_s16(r0));
const uint32x2_t r1_u32 = vreinterpret_u32_u8(vqmovun_s16(r1));
const uint32x2_t r2_u32 = vreinterpret_u32_u8(vqmovun_s16(r2));
const uint32x2_t r3_u32 = vreinterpret_u32_u8(vqmovun_s16(r3));
vst1_lane_u32((uint32_t*)(dst + 0 * BPS), r0_u32, 0);
vst1_lane_u32((uint32_t*)(dst + 1 * BPS), r1_u32, 0);
vst1_lane_u32((uint32_t*)(dst + 2 * BPS), r2_u32, 0);
vst1_lane_u32((uint32_t*)(dst + 3 * BPS), r3_u32, 0);
}
static void VE4(uint8_t* dst) { // vertical
// NB: avoid vld1_u64 here as an alignment hint may be added -> SIGBUS.
const uint64x1_t A0 = vreinterpret_u64_u8(vld1_u8(dst - BPS - 1)); // top row
@ -1327,6 +1354,7 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8DspInitNEON(void) {
VP8SimpleVFilter16i = SimpleVFilter16i;
VP8SimpleHFilter16i = SimpleHFilter16i;
VP8PredLuma4[1] = TM4;
VP8PredLuma4[2] = VE4;
VP8PredLuma4[6] = LD4;
#endif // WEBP_USE_NEON