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Add AArch64 Neon implementation of Intra16Preds

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Add a Neon implementation of Intra16Preds for use on 64-bit Arm
platforms. (This implementation cannot be used on 32-bit Arm
platforms as it makes use of a number of AArch64-only Neon
instructions.)

Change-Id: I24c67cd54b66307e3924fd332c2795fd7422f082
This commit is contained in:
Istvan Stefan 2024-07-05 09:46:30 +01:00 committed by Jonathan Wright
parent baa93808d9
commit 3bfb05e38c
2 changed files with 153 additions and 2 deletions
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4
src/dsp/enc.c
View File

@ -332,6 +332,7 @@ static void IntraChromaPreds_C(uint8_t* dst, const uint8_t* left,
//------------------------------------------------------------------------------
// luma 16x16 prediction (paragraph 12.3)
#if !WEBP_NEON_OMIT_C_CODE || !WEBP_AARCH64
static void Intra16Preds_C(uint8_t* dst,
const uint8_t* left, const uint8_t* top) {
DCMode(I16DC16 + dst, left, top, 16, 16, 5);
@ -339,6 +340,7 @@ static void Intra16Preds_C(uint8_t* dst,
HorizontalPred(I16HE16 + dst, left, 16);
TrueMotion(I16TM16 + dst, left, top, 16);
}
#endif // !WEBP_NEON_OMIT_C_CODE || !WEBP_AARCH64
//------------------------------------------------------------------------------
// luma 4x4 prediction
@ -768,10 +770,10 @@ WEBP_DSP_INIT_FUNC(VP8EncDspInit) {
#if !WEBP_NEON_OMIT_C_CODE || !WEBP_AARCH64
VP8EncPredLuma4 = Intra4Preds_C;
VP8EncPredLuma16 = Intra16Preds_C;
#endif
VP8FTransform2 = FTransform2_C;
VP8EncPredLuma16 = Intra16Preds_C;
VP8EncPredChroma8 = IntraChromaPreds_C;
VP8Mean16x4 = Mean16x4_C;
VP8EncQuantizeBlockWHT = QuantizeBlock_C;

151
src/dsp/enc_neon.c
View File

@ -1024,6 +1024,152 @@ static void Intra4Preds_NEON(uint8_t* dst, const uint8_t* top) {
vst1_u8(dst + I4HD4 + BPS * 3, vget_high_u8(result1));
}
static WEBP_INLINE void Fill_NEON(uint8_t* dst, const uint8_t value) {
uint8x16_t a = vdupq_n_u8(value);
int i;
for (i = 0; i < 16; i++) {
vst1q_u8(dst + BPS * i, a);
}
}
static WEBP_INLINE void Fill16_NEON(uint8_t* dst, const uint8_t* src) {
uint8x16_t a = vld1q_u8(src);
int i;
for (i = 0; i < 16; i++) {
vst1q_u8(dst + BPS * i, a);
}
}
static WEBP_INLINE void HorizontalPred16_NEON(uint8_t* dst,
const uint8_t* left) {
uint8x16_t a;
if (left == NULL) {
Fill_NEON(dst, 129);
return;
}
a = vld1q_u8(left + 0);
vst1q_u8(dst + BPS * 0, vdupq_laneq_u8(a, 0));
vst1q_u8(dst + BPS * 1, vdupq_laneq_u8(a, 1));
vst1q_u8(dst + BPS * 2, vdupq_laneq_u8(a, 2));
vst1q_u8(dst + BPS * 3, vdupq_laneq_u8(a, 3));
vst1q_u8(dst + BPS * 4, vdupq_laneq_u8(a, 4));
vst1q_u8(dst + BPS * 5, vdupq_laneq_u8(a, 5));
vst1q_u8(dst + BPS * 6, vdupq_laneq_u8(a, 6));
vst1q_u8(dst + BPS * 7, vdupq_laneq_u8(a, 7));
vst1q_u8(dst + BPS * 8, vdupq_laneq_u8(a, 8));
vst1q_u8(dst + BPS * 9, vdupq_laneq_u8(a, 9));
vst1q_u8(dst + BPS * 10, vdupq_laneq_u8(a, 10));
vst1q_u8(dst + BPS * 11, vdupq_laneq_u8(a, 11));
vst1q_u8(dst + BPS * 12, vdupq_laneq_u8(a, 12));
vst1q_u8(dst + BPS * 13, vdupq_laneq_u8(a, 13));
vst1q_u8(dst + BPS * 14, vdupq_laneq_u8(a, 14));
vst1q_u8(dst + BPS * 15, vdupq_laneq_u8(a, 15));
}
static WEBP_INLINE void VerticalPred16_NEON(uint8_t* dst, const uint8_t* top) {
if (top != NULL) {
Fill16_NEON(dst, top);
} else {
Fill_NEON(dst, 127);
}
}
static WEBP_INLINE void DCMode_NEON(uint8_t* dst, const uint8_t* left,
const uint8_t* top) {
uint8_t s;
if (top != NULL) {
uint16_t dc;
dc = vaddlvq_u8(vld1q_u8(top));
if (left != NULL) {
// top and left present.
dc += vaddlvq_u8(vld1q_u8(left));
s = vqrshrnh_n_u16(dc, 5);
} else {
// top but no left.
s = vqrshrnh_n_u16(dc, 4);
}
} else {
if (left != NULL) {
uint16_t dc;
// left but no top.
dc = vaddlvq_u8(vld1q_u8(left));
s = vqrshrnh_n_u16(dc, 4);
} else {
// No top, no left, nothing.
s = 0x80;
}
}
Fill_NEON(dst, s);
}
static WEBP_INLINE void TrueMotionHelper_NEON(uint8_t* dst,
const uint8x8_t outer,
const uint8x8x2_t inner,
const uint16x8_t a, int i,
const int n) {
uint8x8_t d1, d2;
uint16x8_t r1, r2;
r1 = vaddl_u8(outer, inner.val[0]);
r1 = vqsubq_u16(r1, a);
d1 = vqmovn_u16(r1);
r2 = vaddl_u8(outer, inner.val[1]);
r2 = vqsubq_u16(r2, a);
d2 = vqmovn_u16(r2);
vst1_u8(dst + BPS * (i * 4 + n), d1);
vst1_u8(dst + BPS * (i * 4 + n) + 8, d2);
}
static WEBP_INLINE void TrueMotion_NEON(uint8_t* dst, const uint8_t* left,
const uint8_t* top) {
int i;
uint16x8_t a;
uint8x8x2_t inner;
if (left == NULL) {
// True motion without left samples (hence: with default 129 value) is
// equivalent to VE prediction where you just copy the top samples.
// Note that if top samples are not available, the default value is then
// 129, and not 127 as in the VerticalPred case.
if (top != NULL) {
VerticalPred16_NEON(dst, top);
} else {
Fill_NEON(dst, 129);
}
return;
}
// left is not NULL.
if (top == NULL) {
HorizontalPred16_NEON(dst, left);
return;
}
// Neither left nor top are NULL.
a = vdupq_n_u16(left[-1]);
inner = vld1_u8_x2(top);
for (i = 0; i < 4; i++) {
const uint8x8x4_t outer = vld4_dup_u8(&left[i * 4]);
TrueMotionHelper_NEON(dst, outer.val[0], inner, a, i, 0);
TrueMotionHelper_NEON(dst, outer.val[1], inner, a, i, 1);
TrueMotionHelper_NEON(dst, outer.val[2], inner, a, i, 2);
TrueMotionHelper_NEON(dst, outer.val[3], inner, a, i, 3);
}
}
static void Intra16Preds_NEON(uint8_t* dst, const uint8_t* left,
const uint8_t* top) {
DCMode_NEON(I16DC16 + dst, left, top);
VerticalPred16_NEON(I16VE16 + dst, top);
HorizontalPred16_NEON(I16HE16 + dst, left);
TrueMotion_NEON(I16TM16 + dst, left, top);
}
#endif // WEBP_AARCH64
//------------------------------------------------------------------------------
@ -1046,9 +1192,12 @@ WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspInitNEON(void) {
VP8SSE8x8 = SSE8x8_NEON;
VP8SSE4x4 = SSE4x4_NEON;
#if WEBP_AARCH64 && (BPS == 32)
#if WEBP_AARCH64
#if BPS == 32
VP8EncPredLuma4 = Intra4Preds_NEON;
#endif
VP8EncPredLuma16 = Intra16Preds_NEON;
#endif
#if !defined(WORK_AROUND_GCC)
VP8EncQuantizeBlock = QuantizeBlock_NEON;