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dsp_dec_neon.c
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dsp_dec_neon.c
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// Copyright 2012 Google Inc. All Rights Reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the COPYING file in the root of the source
// tree. An additional intellectual property rights grant can be found
// in the file PATENTS. All contributing project authors may
// be found in the AUTHORS file in the root of the source tree.
// -----------------------------------------------------------------------------
//
// ARM NEON version of dsp functions and loop filtering.
//
// Authors: Somnath Banerjee ([email protected])
// Johann Koenig ([email protected])
#include "dsp_dsp.h"
#if defined(WEBP_USE_NEON)
#include "dsp_neon.h"
#include "dec_vp8i_dec.h"
//------------------------------------------------------------------------------
// NxM Loading functions
#if !defined(WORK_AROUND_GCC)
// This intrinsics version makes gcc-4.6.3 crash during Load4x??() compilation
// (register alloc, probably). The variants somewhat mitigate the problem, but
// not quite. HFilter16i() remains problematic.
static WEBP_INLINE uint8x8x4_t Load4x8_NEON(const uint8_t* const src,
int stride) {
const uint8x8_t zero = vdup_n_u8(0);
uint8x8x4_t out;
INIT_VECTOR4(out, zero, zero, zero, zero);
out = vld4_lane_u8(src + 0 * stride, out, 0);
out = vld4_lane_u8(src + 1 * stride, out, 1);
out = vld4_lane_u8(src + 2 * stride, out, 2);
out = vld4_lane_u8(src + 3 * stride, out, 3);
out = vld4_lane_u8(src + 4 * stride, out, 4);
out = vld4_lane_u8(src + 5 * stride, out, 5);
out = vld4_lane_u8(src + 6 * stride, out, 6);
out = vld4_lane_u8(src + 7 * stride, out, 7);
return out;
}
static WEBP_INLINE void Load4x16_NEON(const uint8_t* const src, int stride,
uint8x16_t* const p1,
uint8x16_t* const p0,
uint8x16_t* const q0,
uint8x16_t* const q1) {
// row0 = p1[0..7]|p0[0..7]|q0[0..7]|q1[0..7]
// row8 = p1[8..15]|p0[8..15]|q0[8..15]|q1[8..15]
const uint8x8x4_t row0 = Load4x8_NEON(src - 2 + 0 * stride, stride);
const uint8x8x4_t row8 = Load4x8_NEON(src - 2 + 8 * stride, stride);
*p1 = vcombine_u8(row0.val[0], row8.val[0]);
*p0 = vcombine_u8(row0.val[1], row8.val[1]);
*q0 = vcombine_u8(row0.val[2], row8.val[2]);
*q1 = vcombine_u8(row0.val[3], row8.val[3]);
}
#else // WORK_AROUND_GCC
#define LOADQ_LANE_32b(VALUE, LANE) do { \
(VALUE) = vld1q_lane_u32((const uint32_t*)src, (VALUE), (LANE)); \
src += stride; \
} while (0)
static WEBP_INLINE void Load4x16_NEON(const uint8_t* src, int stride,
uint8x16_t* const p1,
uint8x16_t* const p0,
uint8x16_t* const q0,
uint8x16_t* const q1) {
const uint32x4_t zero = vdupq_n_u32(0);
uint32x4x4_t in;
INIT_VECTOR4(in, zero, zero, zero, zero);
src -= 2;
LOADQ_LANE_32b(in.val[0], 0);
LOADQ_LANE_32b(in.val[1], 0);
LOADQ_LANE_32b(in.val[2], 0);
LOADQ_LANE_32b(in.val[3], 0);
LOADQ_LANE_32b(in.val[0], 1);
LOADQ_LANE_32b(in.val[1], 1);
LOADQ_LANE_32b(in.val[2], 1);
LOADQ_LANE_32b(in.val[3], 1);
LOADQ_LANE_32b(in.val[0], 2);
LOADQ_LANE_32b(in.val[1], 2);
LOADQ_LANE_32b(in.val[2], 2);
LOADQ_LANE_32b(in.val[3], 2);
LOADQ_LANE_32b(in.val[0], 3);
LOADQ_LANE_32b(in.val[1], 3);
LOADQ_LANE_32b(in.val[2], 3);
LOADQ_LANE_32b(in.val[3], 3);
// Transpose four 4x4 parts:
{
const uint8x16x2_t row01 = vtrnq_u8(vreinterpretq_u8_u32(in.val[0]),
vreinterpretq_u8_u32(in.val[1]));
const uint8x16x2_t row23 = vtrnq_u8(vreinterpretq_u8_u32(in.val[2]),
vreinterpretq_u8_u32(in.val[3]));
const uint16x8x2_t row02 = vtrnq_u16(vreinterpretq_u16_u8(row01.val[0]),
vreinterpretq_u16_u8(row23.val[0]));
const uint16x8x2_t row13 = vtrnq_u16(vreinterpretq_u16_u8(row01.val[1]),
vreinterpretq_u16_u8(row23.val[1]));
*p1 = vreinterpretq_u8_u16(row02.val[0]);
*p0 = vreinterpretq_u8_u16(row13.val[0]);
*q0 = vreinterpretq_u8_u16(row02.val[1]);
*q1 = vreinterpretq_u8_u16(row13.val[1]);
}
}
#undef LOADQ_LANE_32b
#endif // !WORK_AROUND_GCC
static WEBP_INLINE void Load8x16_NEON(
const uint8_t* const src, int stride,
uint8x16_t* const p3, uint8x16_t* const p2, uint8x16_t* const p1,
uint8x16_t* const p0, uint8x16_t* const q0, uint8x16_t* const q1,
uint8x16_t* const q2, uint8x16_t* const q3) {
Load4x16_NEON(src - 2, stride, p3, p2, p1, p0);
Load4x16_NEON(src + 2, stride, q0, q1, q2, q3);
}
static WEBP_INLINE void Load16x4_NEON(const uint8_t* const src, int stride,
uint8x16_t* const p1,
uint8x16_t* const p0,
uint8x16_t* const q0,
uint8x16_t* const q1) {
*p1 = vld1q_u8(src - 2 * stride);
*p0 = vld1q_u8(src - 1 * stride);
*q0 = vld1q_u8(src + 0 * stride);
*q1 = vld1q_u8(src + 1 * stride);
}
static WEBP_INLINE void Load16x8_NEON(
const uint8_t* const src, int stride,
uint8x16_t* const p3, uint8x16_t* const p2, uint8x16_t* const p1,
uint8x16_t* const p0, uint8x16_t* const q0, uint8x16_t* const q1,
uint8x16_t* const q2, uint8x16_t* const q3) {
Load16x4_NEON(src - 2 * stride, stride, p3, p2, p1, p0);
Load16x4_NEON(src + 2 * stride, stride, q0, q1, q2, q3);
}
static WEBP_INLINE void Load8x8x2_NEON(
const uint8_t* const u, const uint8_t* const v, int stride,
uint8x16_t* const p3, uint8x16_t* const p2, uint8x16_t* const p1,
uint8x16_t* const p0, uint8x16_t* const q0, uint8x16_t* const q1,
uint8x16_t* const q2, uint8x16_t* const q3) {
// We pack the 8x8 u-samples in the lower half of the uint8x16_t destination
// and the v-samples on the higher half.
*p3 = vcombine_u8(vld1_u8(u - 4 * stride), vld1_u8(v - 4 * stride));
*p2 = vcombine_u8(vld1_u8(u - 3 * stride), vld1_u8(v - 3 * stride));
*p1 = vcombine_u8(vld1_u8(u - 2 * stride), vld1_u8(v - 2 * stride));
*p0 = vcombine_u8(vld1_u8(u - 1 * stride), vld1_u8(v - 1 * stride));
*q0 = vcombine_u8(vld1_u8(u + 0 * stride), vld1_u8(v + 0 * stride));
*q1 = vcombine_u8(vld1_u8(u + 1 * stride), vld1_u8(v + 1 * stride));
*q2 = vcombine_u8(vld1_u8(u + 2 * stride), vld1_u8(v + 2 * stride));
*q3 = vcombine_u8(vld1_u8(u + 3 * stride), vld1_u8(v + 3 * stride));
}
#if !defined(WORK_AROUND_GCC)
#define LOAD_UV_8(ROW) \
vcombine_u8(vld1_u8(u - 4 + (ROW) * stride), vld1_u8(v - 4 + (ROW) * stride))
static WEBP_INLINE void Load8x8x2T_NEON(
const uint8_t* const u, const uint8_t* const v, int stride,
uint8x16_t* const p3, uint8x16_t* const p2, uint8x16_t* const p1,
uint8x16_t* const p0, uint8x16_t* const q0, uint8x16_t* const q1,
uint8x16_t* const q2, uint8x16_t* const q3) {
// We pack the 8x8 u-samples in the lower half of the uint8x16_t destination
// and the v-samples on the higher half.
const uint8x16_t row0 = LOAD_UV_8(0);
const uint8x16_t row1 = LOAD_UV_8(1);
const uint8x16_t row2 = LOAD_UV_8(2);
const uint8x16_t row3 = LOAD_UV_8(3);
const uint8x16_t row4 = LOAD_UV_8(4);
const uint8x16_t row5 = LOAD_UV_8(5);
const uint8x16_t row6 = LOAD_UV_8(6);
const uint8x16_t row7 = LOAD_UV_8(7);
// Perform two side-by-side 8x8 transposes
// u00 u01 u02 u03 u04 u05 u06 u07 | v00 v01 v02 v03 v04 v05 v06 v07
// u10 u11 u12 u13 u14 u15 u16 u17 | v10 v11 v12 ...
// u20 u21 u22 u23 u24 u25 u26 u27 | v20 v21 ...
// u30 u31 u32 u33 u34 u35 u36 u37 | ...
// u40 u41 u42 u43 u44 u45 u46 u47 | ...
// u50 u51 u52 u53 u54 u55 u56 u57 | ...
// u60 u61 u62 u63 u64 u65 u66 u67 | v60 ...
// u70 u71 u72 u73 u74 u75 u76 u77 | v70 v71 v72 ...
const uint8x16x2_t row01 = vtrnq_u8(row0, row1); // u00 u10 u02 u12 ...
// u01 u11 u03 u13 ...
const uint8x16x2_t row23 = vtrnq_u8(row2, row3); // u20 u30 u22 u32 ...
// u21 u31 u23 u33 ...
const uint8x16x2_t row45 = vtrnq_u8(row4, row5); // ...
const uint8x16x2_t row67 = vtrnq_u8(row6, row7); // ...
const uint16x8x2_t row02 = vtrnq_u16(vreinterpretq_u16_u8(row01.val[0]),
vreinterpretq_u16_u8(row23.val[0]));
const uint16x8x2_t row13 = vtrnq_u16(vreinterpretq_u16_u8(row01.val[1]),
vreinterpretq_u16_u8(row23.val[1]));
const uint16x8x2_t row46 = vtrnq_u16(vreinterpretq_u16_u8(row45.val[0]),
vreinterpretq_u16_u8(row67.val[0]));
const uint16x8x2_t row57 = vtrnq_u16(vreinterpretq_u16_u8(row45.val[1]),
vreinterpretq_u16_u8(row67.val[1]));
const uint32x4x2_t row04 = vtrnq_u32(vreinterpretq_u32_u16(row02.val[0]),
vreinterpretq_u32_u16(row46.val[0]));
const uint32x4x2_t row26 = vtrnq_u32(vreinterpretq_u32_u16(row02.val[1]),
vreinterpretq_u32_u16(row46.val[1]));
const uint32x4x2_t row15 = vtrnq_u32(vreinterpretq_u32_u16(row13.val[0]),
vreinterpretq_u32_u16(row57.val[0]));
const uint32x4x2_t row37 = vtrnq_u32(vreinterpretq_u32_u16(row13.val[1]),
vreinterpretq_u32_u16(row57.val[1]));
*p3 = vreinterpretq_u8_u32(row04.val[0]);
*p2 = vreinterpretq_u8_u32(row15.val[0]);
*p1 = vreinterpretq_u8_u32(row26.val[0]);
*p0 = vreinterpretq_u8_u32(row37.val[0]);
*q0 = vreinterpretq_u8_u32(row04.val[1]);
*q1 = vreinterpretq_u8_u32(row15.val[1]);
*q2 = vreinterpretq_u8_u32(row26.val[1]);
*q3 = vreinterpretq_u8_u32(row37.val[1]);
}
#undef LOAD_UV_8
#endif // !WORK_AROUND_GCC
static WEBP_INLINE void Store2x8_NEON(const uint8x8x2_t v,
uint8_t* const dst, int stride) {
vst2_lane_u8(dst + 0 * stride, v, 0);
vst2_lane_u8(dst + 1 * stride, v, 1);
vst2_lane_u8(dst + 2 * stride, v, 2);
vst2_lane_u8(dst + 3 * stride, v, 3);
vst2_lane_u8(dst + 4 * stride, v, 4);
vst2_lane_u8(dst + 5 * stride, v, 5);
vst2_lane_u8(dst + 6 * stride, v, 6);
vst2_lane_u8(dst + 7 * stride, v, 7);
}
static WEBP_INLINE void Store2x16_NEON(const uint8x16_t p0, const uint8x16_t q0,
uint8_t* const dst, int stride) {
uint8x8x2_t lo, hi;
lo.val[0] = vget_low_u8(p0);
lo.val[1] = vget_low_u8(q0);
hi.val[0] = vget_high_u8(p0);
hi.val[1] = vget_high_u8(q0);
Store2x8_NEON(lo, dst - 1 + 0 * stride, stride);
Store2x8_NEON(hi, dst - 1 + 8 * stride, stride);
}
#if !defined(WORK_AROUND_GCC)
static WEBP_INLINE void Store4x8_NEON(const uint8x8x4_t v,
uint8_t* const dst, int stride) {
vst4_lane_u8(dst + 0 * stride, v, 0);
vst4_lane_u8(dst + 1 * stride, v, 1);
vst4_lane_u8(dst + 2 * stride, v, 2);
vst4_lane_u8(dst + 3 * stride, v, 3);
vst4_lane_u8(dst + 4 * stride, v, 4);
vst4_lane_u8(dst + 5 * stride, v, 5);
vst4_lane_u8(dst + 6 * stride, v, 6);
vst4_lane_u8(dst + 7 * stride, v, 7);
}
static WEBP_INLINE void Store4x16_NEON(const uint8x16_t p1, const uint8x16_t p0,
const uint8x16_t q0, const uint8x16_t q1,
uint8_t* const dst, int stride) {
uint8x8x4_t lo, hi;
INIT_VECTOR4(lo,
vget_low_u8(p1), vget_low_u8(p0),
vget_low_u8(q0), vget_low_u8(q1));
INIT_VECTOR4(hi,
vget_high_u8(p1), vget_high_u8(p0),
vget_high_u8(q0), vget_high_u8(q1));
Store4x8_NEON(lo, dst - 2 + 0 * stride, stride);
Store4x8_NEON(hi, dst - 2 + 8 * stride, stride);
}
#endif // !WORK_AROUND_GCC
static WEBP_INLINE void Store16x2_NEON(const uint8x16_t p0, const uint8x16_t q0,
uint8_t* const dst, int stride) {
vst1q_u8(dst - stride, p0);
vst1q_u8(dst, q0);
}
static WEBP_INLINE void Store16x4_NEON(const uint8x16_t p1, const uint8x16_t p0,
const uint8x16_t q0, const uint8x16_t q1,
uint8_t* const dst, int stride) {
Store16x2_NEON(p1, p0, dst - stride, stride);
Store16x2_NEON(q0, q1, dst + stride, stride);
}
static WEBP_INLINE void Store8x2x2_NEON(const uint8x16_t p0,
const uint8x16_t q0,
uint8_t* const u, uint8_t* const v,
int stride) {
// p0 and q0 contain the u+v samples packed in low/high halves.
vst1_u8(u - stride, vget_low_u8(p0));
vst1_u8(u, vget_low_u8(q0));
vst1_u8(v - stride, vget_high_u8(p0));
vst1_u8(v, vget_high_u8(q0));
}
static WEBP_INLINE void Store8x4x2_NEON(const uint8x16_t p1,
const uint8x16_t p0,
const uint8x16_t q0,
const uint8x16_t q1,
uint8_t* const u, uint8_t* const v,
int stride) {
// The p1...q1 registers contain the u+v samples packed in low/high halves.
Store8x2x2_NEON(p1, p0, u - stride, v - stride, stride);
Store8x2x2_NEON(q0, q1, u + stride, v + stride, stride);
}
#if !defined(WORK_AROUND_GCC)
#define STORE6_LANE(DST, VAL0, VAL1, LANE) do { \
vst3_lane_u8((DST) - 3, (VAL0), (LANE)); \
vst3_lane_u8((DST) + 0, (VAL1), (LANE)); \
(DST) += stride; \
} while (0)
static WEBP_INLINE void Store6x8x2_NEON(
const uint8x16_t p2, const uint8x16_t p1, const uint8x16_t p0,
const uint8x16_t q0, const uint8x16_t q1, const uint8x16_t q2,
uint8_t* u, uint8_t* v, int stride) {
uint8x8x3_t u0, u1, v0, v1;
INIT_VECTOR3(u0, vget_low_u8(p2), vget_low_u8(p1), vget_low_u8(p0));
INIT_VECTOR3(u1, vget_low_u8(q0), vget_low_u8(q1), vget_low_u8(q2));
INIT_VECTOR3(v0, vget_high_u8(p2), vget_high_u8(p1), vget_high_u8(p0));
INIT_VECTOR3(v1, vget_high_u8(q0), vget_high_u8(q1), vget_high_u8(q2));
STORE6_LANE(u, u0, u1, 0);
STORE6_LANE(u, u0, u1, 1);
STORE6_LANE(u, u0, u1, 2);
STORE6_LANE(u, u0, u1, 3);
STORE6_LANE(u, u0, u1, 4);
STORE6_LANE(u, u0, u1, 5);
STORE6_LANE(u, u0, u1, 6);
STORE6_LANE(u, u0, u1, 7);
STORE6_LANE(v, v0, v1, 0);
STORE6_LANE(v, v0, v1, 1);
STORE6_LANE(v, v0, v1, 2);
STORE6_LANE(v, v0, v1, 3);
STORE6_LANE(v, v0, v1, 4);
STORE6_LANE(v, v0, v1, 5);
STORE6_LANE(v, v0, v1, 6);
STORE6_LANE(v, v0, v1, 7);
}
#undef STORE6_LANE
static WEBP_INLINE void Store4x8x2_NEON(const uint8x16_t p1,
const uint8x16_t p0,
const uint8x16_t q0,
const uint8x16_t q1,
uint8_t* const u, uint8_t* const v,
int stride) {
uint8x8x4_t u0, v0;
INIT_VECTOR4(u0,
vget_low_u8(p1), vget_low_u8(p0),
vget_low_u8(q0), vget_low_u8(q1));
INIT_VECTOR4(v0,
vget_high_u8(p1), vget_high_u8(p0),
vget_high_u8(q0), vget_high_u8(q1));
vst4_lane_u8(u - 2 + 0 * stride, u0, 0);
vst4_lane_u8(u - 2 + 1 * stride, u0, 1);
vst4_lane_u8(u - 2 + 2 * stride, u0, 2);
vst4_lane_u8(u - 2 + 3 * stride, u0, 3);
vst4_lane_u8(u - 2 + 4 * stride, u0, 4);
vst4_lane_u8(u - 2 + 5 * stride, u0, 5);
vst4_lane_u8(u - 2 + 6 * stride, u0, 6);
vst4_lane_u8(u - 2 + 7 * stride, u0, 7);
vst4_lane_u8(v - 2 + 0 * stride, v0, 0);
vst4_lane_u8(v - 2 + 1 * stride, v0, 1);
vst4_lane_u8(v - 2 + 2 * stride, v0, 2);
vst4_lane_u8(v - 2 + 3 * stride, v0, 3);
vst4_lane_u8(v - 2 + 4 * stride, v0, 4);
vst4_lane_u8(v - 2 + 5 * stride, v0, 5);
vst4_lane_u8(v - 2 + 6 * stride, v0, 6);
vst4_lane_u8(v - 2 + 7 * stride, v0, 7);
}
#endif // !WORK_AROUND_GCC
// Zero extend 'v' to an int16x8_t.
static WEBP_INLINE int16x8_t ConvertU8ToS16_NEON(uint8x8_t v) {
return vreinterpretq_s16_u16(vmovl_u8(v));
}
// Performs unsigned 8b saturation on 'dst01' and 'dst23' storing the result
// to the corresponding rows of 'dst'.
static WEBP_INLINE void SaturateAndStore4x4_NEON(uint8_t* const dst,
const int16x8_t dst01,
const int16x8_t dst23) {
// Unsigned saturate to 8b.
const uint8x8_t dst01_u8 = vqmovun_s16(dst01);
const uint8x8_t dst23_u8 = vqmovun_s16(dst23);
// Store the results.
vst1_lane_u32((uint32_t*)(dst + 0 * BPS), vreinterpret_u32_u8(dst01_u8), 0);
vst1_lane_u32((uint32_t*)(dst + 1 * BPS), vreinterpret_u32_u8(dst01_u8), 1);
vst1_lane_u32((uint32_t*)(dst + 2 * BPS), vreinterpret_u32_u8(dst23_u8), 0);
vst1_lane_u32((uint32_t*)(dst + 3 * BPS), vreinterpret_u32_u8(dst23_u8), 1);
}
static WEBP_INLINE void Add4x4_NEON(const int16x8_t row01,
const int16x8_t row23,
uint8_t* const dst) {
uint32x2_t dst01 = vdup_n_u32(0);
uint32x2_t dst23 = vdup_n_u32(0);
// Load the source pixels.
dst01 = vld1_lane_u32((uint32_t*)(dst + 0 * BPS), dst01, 0);
dst23 = vld1_lane_u32((uint32_t*)(dst + 2 * BPS), dst23, 0);
dst01 = vld1_lane_u32((uint32_t*)(dst + 1 * BPS), dst01, 1);
dst23 = vld1_lane_u32((uint32_t*)(dst + 3 * BPS), dst23, 1);
{
// Convert to 16b.
const int16x8_t dst01_s16 = ConvertU8ToS16_NEON(vreinterpret_u8_u32(dst01));
const int16x8_t dst23_s16 = ConvertU8ToS16_NEON(vreinterpret_u8_u32(dst23));
// Descale with rounding.
const int16x8_t out01 = vrsraq_n_s16(dst01_s16, row01, 3);
const int16x8_t out23 = vrsraq_n_s16(dst23_s16, row23, 3);
// Add the inverse transform.
SaturateAndStore4x4_NEON(dst, out01, out23);
}
}
//-----------------------------------------------------------------------------
// Simple In-loop filtering (Paragraph 15.2)
static uint8x16_t NeedsFilter_NEON(const uint8x16_t p1, const uint8x16_t p0,
const uint8x16_t q0, const uint8x16_t q1,
int thresh) {
const uint8x16_t thresh_v = vdupq_n_u8((uint8_t)thresh);
const uint8x16_t a_p0_q0 = vabdq_u8(p0, q0); // abs(p0-q0)
const uint8x16_t a_p1_q1 = vabdq_u8(p1, q1); // abs(p1-q1)
const uint8x16_t a_p0_q0_2 = vqaddq_u8(a_p0_q0, a_p0_q0); // 2 * abs(p0-q0)
const uint8x16_t a_p1_q1_2 = vshrq_n_u8(a_p1_q1, 1); // abs(p1-q1) / 2
const uint8x16_t sum = vqaddq_u8(a_p0_q0_2, a_p1_q1_2);
const uint8x16_t mask = vcgeq_u8(thresh_v, sum);
return mask;
}
static int8x16_t FlipSign_NEON(const uint8x16_t v) {
const uint8x16_t sign_bit = vdupq_n_u8(0x80);
return vreinterpretq_s8_u8(veorq_u8(v, sign_bit));
}
static uint8x16_t FlipSignBack_NEON(const int8x16_t v) {
const int8x16_t sign_bit = vdupq_n_s8(0x80);
return vreinterpretq_u8_s8(veorq_s8(v, sign_bit));
}
static int8x16_t GetBaseDelta_NEON(const int8x16_t p1, const int8x16_t p0,
const int8x16_t q0, const int8x16_t q1) {
const int8x16_t q0_p0 = vqsubq_s8(q0, p0); // (q0-p0)
const int8x16_t p1_q1 = vqsubq_s8(p1, q1); // (p1-q1)
const int8x16_t s1 = vqaddq_s8(p1_q1, q0_p0); // (p1-q1) + 1 * (q0 - p0)
const int8x16_t s2 = vqaddq_s8(q0_p0, s1); // (p1-q1) + 2 * (q0 - p0)
const int8x16_t s3 = vqaddq_s8(q0_p0, s2); // (p1-q1) + 3 * (q0 - p0)
return s3;
}
static int8x16_t GetBaseDelta0_NEON(const int8x16_t p0, const int8x16_t q0) {
const int8x16_t q0_p0 = vqsubq_s8(q0, p0); // (q0-p0)
const int8x16_t s1 = vqaddq_s8(q0_p0, q0_p0); // 2 * (q0 - p0)
const int8x16_t s2 = vqaddq_s8(q0_p0, s1); // 3 * (q0 - p0)
return s2;
}
//------------------------------------------------------------------------------
static void ApplyFilter2NoFlip_NEON(const int8x16_t p0s, const int8x16_t q0s,
const int8x16_t delta,
int8x16_t* const op0,
int8x16_t* const oq0) {
const int8x16_t kCst3 = vdupq_n_s8(0x03);
const int8x16_t kCst4 = vdupq_n_s8(0x04);
const int8x16_t delta_p3 = vqaddq_s8(delta, kCst3);
const int8x16_t delta_p4 = vqaddq_s8(delta, kCst4);
const int8x16_t delta3 = vshrq_n_s8(delta_p3, 3);
const int8x16_t delta4 = vshrq_n_s8(delta_p4, 3);
*op0 = vqaddq_s8(p0s, delta3);
*oq0 = vqsubq_s8(q0s, delta4);
}
#if defined(WEBP_USE_INTRINSICS)
static void ApplyFilter2_NEON(const int8x16_t p0s, const int8x16_t q0s,
const int8x16_t delta,
uint8x16_t* const op0, uint8x16_t* const oq0) {
const int8x16_t kCst3 = vdupq_n_s8(0x03);
const int8x16_t kCst4 = vdupq_n_s8(0x04);
const int8x16_t delta_p3 = vqaddq_s8(delta, kCst3);
const int8x16_t delta_p4 = vqaddq_s8(delta, kCst4);
const int8x16_t delta3 = vshrq_n_s8(delta_p3, 3);
const int8x16_t delta4 = vshrq_n_s8(delta_p4, 3);
const int8x16_t sp0 = vqaddq_s8(p0s, delta3);
const int8x16_t sq0 = vqsubq_s8(q0s, delta4);
*op0 = FlipSignBack_NEON(sp0);
*oq0 = FlipSignBack_NEON(sq0);
}
static void DoFilter2_NEON(const uint8x16_t p1, const uint8x16_t p0,
const uint8x16_t q0, const uint8x16_t q1,
const uint8x16_t mask,
uint8x16_t* const op0, uint8x16_t* const oq0) {
const int8x16_t p1s = FlipSign_NEON(p1);
const int8x16_t p0s = FlipSign_NEON(p0);
const int8x16_t q0s = FlipSign_NEON(q0);
const int8x16_t q1s = FlipSign_NEON(q1);
const int8x16_t delta0 = GetBaseDelta_NEON(p1s, p0s, q0s, q1s);
const int8x16_t delta1 = vandq_s8(delta0, vreinterpretq_s8_u8(mask));
ApplyFilter2_NEON(p0s, q0s, delta1, op0, oq0);
}
static void SimpleVFilter16_NEON(uint8_t* p, int stride, int thresh) {
uint8x16_t p1, p0, q0, q1, op0, oq0;
Load16x4_NEON(p, stride, &p1, &p0, &q0, &q1);
{
const uint8x16_t mask = NeedsFilter_NEON(p1, p0, q0, q1, thresh);
DoFilter2_NEON(p1, p0, q0, q1, mask, &op0, &oq0);
}
Store16x2_NEON(op0, oq0, p, stride);
}
static void SimpleHFilter16_NEON(uint8_t* p, int stride, int thresh) {
uint8x16_t p1, p0, q0, q1, oq0, op0;
Load4x16_NEON(p, stride, &p1, &p0, &q0, &q1);
{
const uint8x16_t mask = NeedsFilter_NEON(p1, p0, q0, q1, thresh);
DoFilter2_NEON(p1, p0, q0, q1, mask, &op0, &oq0);
}
Store2x16_NEON(op0, oq0, p, stride);
}
#else
// Load/Store vertical edge
#define LOAD8x4(c1, c2, c3, c4, b1, b2, stride) \
"vld4.8 {" #c1 "[0]," #c2 "[0]," #c3 "[0]," #c4 "[0]}," #b1 "," #stride "\n" \
"vld4.8 {" #c1 "[1]," #c2 "[1]," #c3 "[1]," #c4 "[1]}," #b2 "," #stride "\n" \
"vld4.8 {" #c1 "[2]," #c2 "[2]," #c3 "[2]," #c4 "[2]}," #b1 "," #stride "\n" \
"vld4.8 {" #c1 "[3]," #c2 "[3]," #c3 "[3]," #c4 "[3]}," #b2 "," #stride "\n" \
"vld4.8 {" #c1 "[4]," #c2 "[4]," #c3 "[4]," #c4 "[4]}," #b1 "," #stride "\n" \
"vld4.8 {" #c1 "[5]," #c2 "[5]," #c3 "[5]," #c4 "[5]}," #b2 "," #stride "\n" \
"vld4.8 {" #c1 "[6]," #c2 "[6]," #c3 "[6]," #c4 "[6]}," #b1 "," #stride "\n" \
"vld4.8 {" #c1 "[7]," #c2 "[7]," #c3 "[7]," #c4 "[7]}," #b2 "," #stride "\n"
#define STORE8x2(c1, c2, p, stride) \
"vst2.8 {" #c1 "[0], " #c2 "[0]}," #p "," #stride " \n" \
"vst2.8 {" #c1 "[1], " #c2 "[1]}," #p "," #stride " \n" \
"vst2.8 {" #c1 "[2], " #c2 "[2]}," #p "," #stride " \n" \
"vst2.8 {" #c1 "[3], " #c2 "[3]}," #p "," #stride " \n" \
"vst2.8 {" #c1 "[4], " #c2 "[4]}," #p "," #stride " \n" \
"vst2.8 {" #c1 "[5], " #c2 "[5]}," #p "," #stride " \n" \
"vst2.8 {" #c1 "[6], " #c2 "[6]}," #p "," #stride " \n" \
"vst2.8 {" #c1 "[7], " #c2 "[7]}," #p "," #stride " \n"
#define QRegs "q0", "q1", "q2", "q3", \
"q8", "q9", "q10", "q11", "q12", "q13", "q14", "q15"
#define FLIP_SIGN_BIT2(a, b, s) \
"veor " #a "," #a "," #s " \n" \
"veor " #b "," #b "," #s " \n" \
#define FLIP_SIGN_BIT4(a, b, c, d, s) \
FLIP_SIGN_BIT2(a, b, s) \
FLIP_SIGN_BIT2(c, d, s) \
#define NEEDS_FILTER(p1, p0, q0, q1, thresh, mask) \
"vabd.u8 q15," #p0 "," #q0 " \n" /* abs(p0 - q0) */ \
"vabd.u8 q14," #p1 "," #q1 " \n" /* abs(p1 - q1) */ \
"vqadd.u8 q15, q15, q15 \n" /* abs(p0 - q0) * 2 */ \
"vshr.u8 q14, q14, #1 \n" /* abs(p1 - q1) / 2 */ \
"vqadd.u8 q15, q15, q14 \n" /* abs(p0 - q0) * 2 + abs(p1 - q1) / 2 */ \
"vdup.8 q14, " #thresh " \n" \
"vcge.u8 " #mask ", q14, q15 \n" /* mask <= thresh */
#define GET_BASE_DELTA(p1, p0, q0, q1, o) \
"vqsub.s8 q15," #q0 "," #p0 " \n" /* (q0 - p0) */ \
"vqsub.s8 " #o "," #p1 "," #q1 " \n" /* (p1 - q1) */ \
"vqadd.s8 " #o "," #o ", q15 \n" /* (p1 - q1) + 1 * (p0 - q0) */ \
"vqadd.s8 " #o "," #o ", q15 \n" /* (p1 - q1) + 2 * (p0 - q0) */ \
"vqadd.s8 " #o "," #o ", q15 \n" /* (p1 - q1) + 3 * (p0 - q0) */
#define DO_SIMPLE_FILTER(p0, q0, fl) \
"vmov.i8 q15, #0x03 \n" \
"vqadd.s8 q15, q15, " #fl " \n" /* filter1 = filter + 3 */ \
"vshr.s8 q15, q15, #3 \n" /* filter1 >> 3 */ \
"vqadd.s8 " #p0 "," #p0 ", q15 \n" /* p0 += filter1 */ \
\
"vmov.i8 q15, #0x04 \n" \
"vqadd.s8 q15, q15, " #fl " \n" /* filter1 = filter + 4 */ \
"vshr.s8 q15, q15, #3 \n" /* filter2 >> 3 */ \
"vqsub.s8 " #q0 "," #q0 ", q15 \n" /* q0 -= filter2 */
// Applies filter on 2 pixels (p0 and q0)
#define DO_FILTER2(p1, p0, q0, q1, thresh) \
NEEDS_FILTER(p1, p0, q0, q1, thresh, q9) /* filter mask in q9 */ \
"vmov.i8 q10, #0x80 \n" /* sign bit */ \
FLIP_SIGN_BIT4(p1, p0, q0, q1, q10) /* convert to signed value */ \
GET_BASE_DELTA(p1, p0, q0, q1, q11) /* get filter level */ \
"vand q9, q9, q11 \n" /* apply filter mask */ \
DO_SIMPLE_FILTER(p0, q0, q9) /* apply filter */ \
FLIP_SIGN_BIT2(p0, q0, q10)
static void SimpleVFilter16_NEON(uint8_t* p, int stride, int thresh) {
__asm__ volatile (
"sub %[p], %[p], %[stride], lsl #1 \n" // p -= 2 * stride
"vld1.u8 {q1}, [%[p]], %[stride] \n" // p1
"vld1.u8 {q2}, [%[p]], %[stride] \n" // p0
"vld1.u8 {q3}, [%[p]], %[stride] \n" // q0
"vld1.u8 {q12}, [%[p]] \n" // q1
DO_FILTER2(q1, q2, q3, q12, %[thresh])
"sub %[p], %[p], %[stride], lsl #1 \n" // p -= 2 * stride
"vst1.u8 {q2}, [%[p]], %[stride] \n" // store op0
"vst1.u8 {q3}, [%[p]] \n" // store oq0
: [p] "+r"(p)
: [stride] "r"(stride), [thresh] "r"(thresh)
: "memory", QRegs
);
}
static void SimpleHFilter16_NEON(uint8_t* p, int stride, int thresh) {
__asm__ volatile (
"sub r4, %[p], #2 \n" // base1 = p - 2
"lsl r6, %[stride], #1 \n" // r6 = 2 * stride
"add r5, r4, %[stride] \n" // base2 = base1 + stride
LOAD8x4(d2, d3, d4, d5, [r4], [r5], r6)
LOAD8x4(d24, d25, d26, d27, [r4], [r5], r6)
"vswp d3, d24 \n" // p1:q1 p0:q3
"vswp d5, d26 \n" // q0:q2 q1:q4
"vswp q2, q12 \n" // p1:q1 p0:q2 q0:q3 q1:q4
DO_FILTER2(q1, q2, q12, q13, %[thresh])
"sub %[p], %[p], #1 \n" // p - 1
"vswp d5, d24 \n"
STORE8x2(d4, d5, [%[p]], %[stride])
STORE8x2(d24, d25, [%[p]], %[stride])
: [p] "+r"(p)
: [stride] "r"(stride), [thresh] "r"(thresh)
: "memory", "r4", "r5", "r6", QRegs
);
}
#undef LOAD8x4
#undef STORE8x2
#endif // WEBP_USE_INTRINSICS
static void SimpleVFilter16i_NEON(uint8_t* p, int stride, int thresh) {
uint32_t k;
for (k = 3; k != 0; --k) {
p += 4 * stride;
SimpleVFilter16_NEON(p, stride, thresh);
}
}
static void SimpleHFilter16i_NEON(uint8_t* p, int stride, int thresh) {
uint32_t k;
for (k = 3; k != 0; --k) {
p += 4;
SimpleHFilter16_NEON(p, stride, thresh);
}
}
//------------------------------------------------------------------------------
// Complex In-loop filtering (Paragraph 15.3)
static uint8x16_t NeedsHev_NEON(const uint8x16_t p1, const uint8x16_t p0,
const uint8x16_t q0, const uint8x16_t q1,
int hev_thresh) {
const uint8x16_t hev_thresh_v = vdupq_n_u8((uint8_t)hev_thresh);
const uint8x16_t a_p1_p0 = vabdq_u8(p1, p0); // abs(p1 - p0)
const uint8x16_t a_q1_q0 = vabdq_u8(q1, q0); // abs(q1 - q0)
const uint8x16_t a_max = vmaxq_u8(a_p1_p0, a_q1_q0);
const uint8x16_t mask = vcgtq_u8(a_max, hev_thresh_v);
return mask;
}
static uint8x16_t NeedsFilter2_NEON(const uint8x16_t p3, const uint8x16_t p2,
const uint8x16_t p1, const uint8x16_t p0,
const uint8x16_t q0, const uint8x16_t q1,
const uint8x16_t q2, const uint8x16_t q3,
int ithresh, int thresh) {
const uint8x16_t ithresh_v = vdupq_n_u8((uint8_t)ithresh);
const uint8x16_t a_p3_p2 = vabdq_u8(p3, p2); // abs(p3 - p2)
const uint8x16_t a_p2_p1 = vabdq_u8(p2, p1); // abs(p2 - p1)
const uint8x16_t a_p1_p0 = vabdq_u8(p1, p0); // abs(p1 - p0)
const uint8x16_t a_q3_q2 = vabdq_u8(q3, q2); // abs(q3 - q2)
const uint8x16_t a_q2_q1 = vabdq_u8(q2, q1); // abs(q2 - q1)
const uint8x16_t a_q1_q0 = vabdq_u8(q1, q0); // abs(q1 - q0)
const uint8x16_t max1 = vmaxq_u8(a_p3_p2, a_p2_p1);
const uint8x16_t max2 = vmaxq_u8(a_p1_p0, a_q3_q2);
const uint8x16_t max3 = vmaxq_u8(a_q2_q1, a_q1_q0);
const uint8x16_t max12 = vmaxq_u8(max1, max2);
const uint8x16_t max123 = vmaxq_u8(max12, max3);
const uint8x16_t mask2 = vcgeq_u8(ithresh_v, max123);
const uint8x16_t mask1 = NeedsFilter_NEON(p1, p0, q0, q1, thresh);
const uint8x16_t mask = vandq_u8(mask1, mask2);
return mask;
}
// 4-points filter
static void ApplyFilter4_NEON(
const int8x16_t p1, const int8x16_t p0,
const int8x16_t q0, const int8x16_t q1,
const int8x16_t delta0,
uint8x16_t* const op1, uint8x16_t* const op0,
uint8x16_t* const oq0, uint8x16_t* const oq1) {
const int8x16_t kCst3 = vdupq_n_s8(0x03);
const int8x16_t kCst4 = vdupq_n_s8(0x04);
const int8x16_t delta1 = vqaddq_s8(delta0, kCst4);
const int8x16_t delta2 = vqaddq_s8(delta0, kCst3);
const int8x16_t a1 = vshrq_n_s8(delta1, 3);
const int8x16_t a2 = vshrq_n_s8(delta2, 3);
const int8x16_t a3 = vrshrq_n_s8(a1, 1); // a3 = (a1 + 1) >> 1
*op0 = FlipSignBack_NEON(vqaddq_s8(p0, a2)); // clip(p0 + a2)
*oq0 = FlipSignBack_NEON(vqsubq_s8(q0, a1)); // clip(q0 - a1)
*op1 = FlipSignBack_NEON(vqaddq_s8(p1, a3)); // clip(p1 + a3)
*oq1 = FlipSignBack_NEON(vqsubq_s8(q1, a3)); // clip(q1 - a3)
}
static void DoFilter4_NEON(
const uint8x16_t p1, const uint8x16_t p0,
const uint8x16_t q0, const uint8x16_t q1,
const uint8x16_t mask, const uint8x16_t hev_mask,
uint8x16_t* const op1, uint8x16_t* const op0,
uint8x16_t* const oq0, uint8x16_t* const oq1) {
// This is a fused version of DoFilter2() calling ApplyFilter2 directly
const int8x16_t p1s = FlipSign_NEON(p1);
int8x16_t p0s = FlipSign_NEON(p0);
int8x16_t q0s = FlipSign_NEON(q0);
const int8x16_t q1s = FlipSign_NEON(q1);
const uint8x16_t simple_lf_mask = vandq_u8(mask, hev_mask);
// do_filter2 part (simple loopfilter on pixels with hev)
{
const int8x16_t delta = GetBaseDelta_NEON(p1s, p0s, q0s, q1s);
const int8x16_t simple_lf_delta =
vandq_s8(delta, vreinterpretq_s8_u8(simple_lf_mask));
ApplyFilter2NoFlip_NEON(p0s, q0s, simple_lf_delta, &p0s, &q0s);
}
// do_filter4 part (complex loopfilter on pixels without hev)
{
const int8x16_t delta0 = GetBaseDelta0_NEON(p0s, q0s);
// we use: (mask & hev_mask) ^ mask = mask & !hev_mask
const uint8x16_t complex_lf_mask = veorq_u8(simple_lf_mask, mask);
const int8x16_t complex_lf_delta =
vandq_s8(delta0, vreinterpretq_s8_u8(complex_lf_mask));
ApplyFilter4_NEON(p1s, p0s, q0s, q1s, complex_lf_delta, op1, op0, oq0, oq1);
}
}
// 6-points filter
static void ApplyFilter6_NEON(
const int8x16_t p2, const int8x16_t p1, const int8x16_t p0,
const int8x16_t q0, const int8x16_t q1, const int8x16_t q2,
const int8x16_t delta,
uint8x16_t* const op2, uint8x16_t* const op1, uint8x16_t* const op0,
uint8x16_t* const oq0, uint8x16_t* const oq1, uint8x16_t* const oq2) {
// We have to compute: X = (9*a+63) >> 7, Y = (18*a+63)>>7, Z = (27*a+63) >> 7
// Turns out, there's a common sub-expression S=9 * a - 1 that can be used
// with the special vqrshrn_n_s16 rounding-shift-and-narrow instruction:
// X = (S + 64) >> 7, Y = (S + 32) >> 6, Z = (18 * a + S + 64) >> 7
const int8x8_t delta_lo = vget_low_s8(delta);
const int8x8_t delta_hi = vget_high_s8(delta);
const int8x8_t kCst9 = vdup_n_s8(9);
const int16x8_t kCstm1 = vdupq_n_s16(-1);
const int8x8_t kCst18 = vdup_n_s8(18);
const int16x8_t S_lo = vmlal_s8(kCstm1, kCst9, delta_lo); // S = 9 * a - 1
const int16x8_t S_hi = vmlal_s8(kCstm1, kCst9, delta_hi);
const int16x8_t Z_lo = vmlal_s8(S_lo, kCst18, delta_lo); // S + 18 * a
const int16x8_t Z_hi = vmlal_s8(S_hi, kCst18, delta_hi);
const int8x8_t a3_lo = vqrshrn_n_s16(S_lo, 7); // (9 * a + 63) >> 7
const int8x8_t a3_hi = vqrshrn_n_s16(S_hi, 7);
const int8x8_t a2_lo = vqrshrn_n_s16(S_lo, 6); // (9 * a + 31) >> 6
const int8x8_t a2_hi = vqrshrn_n_s16(S_hi, 6);
const int8x8_t a1_lo = vqrshrn_n_s16(Z_lo, 7); // (27 * a + 63) >> 7
const int8x8_t a1_hi = vqrshrn_n_s16(Z_hi, 7);
const int8x16_t a1 = vcombine_s8(a1_lo, a1_hi);
const int8x16_t a2 = vcombine_s8(a2_lo, a2_hi);
const int8x16_t a3 = vcombine_s8(a3_lo, a3_hi);
*op0 = FlipSignBack_NEON(vqaddq_s8(p0, a1)); // clip(p0 + a1)
*oq0 = FlipSignBack_NEON(vqsubq_s8(q0, a1)); // clip(q0 - q1)
*oq1 = FlipSignBack_NEON(vqsubq_s8(q1, a2)); // clip(q1 - a2)
*op1 = FlipSignBack_NEON(vqaddq_s8(p1, a2)); // clip(p1 + a2)
*oq2 = FlipSignBack_NEON(vqsubq_s8(q2, a3)); // clip(q2 - a3)
*op2 = FlipSignBack_NEON(vqaddq_s8(p2, a3)); // clip(p2 + a3)
}
static void DoFilter6_NEON(
const uint8x16_t p2, const uint8x16_t p1, const uint8x16_t p0,
const uint8x16_t q0, const uint8x16_t q1, const uint8x16_t q2,
const uint8x16_t mask, const uint8x16_t hev_mask,
uint8x16_t* const op2, uint8x16_t* const op1, uint8x16_t* const op0,
uint8x16_t* const oq0, uint8x16_t* const oq1, uint8x16_t* const oq2) {
// This is a fused version of DoFilter2() calling ApplyFilter2 directly
const int8x16_t p2s = FlipSign_NEON(p2);
const int8x16_t p1s = FlipSign_NEON(p1);
int8x16_t p0s = FlipSign_NEON(p0);
int8x16_t q0s = FlipSign_NEON(q0);
const int8x16_t q1s = FlipSign_NEON(q1);
const int8x16_t q2s = FlipSign_NEON(q2);
const uint8x16_t simple_lf_mask = vandq_u8(mask, hev_mask);
const int8x16_t delta0 = GetBaseDelta_NEON(p1s, p0s, q0s, q1s);
// do_filter2 part (simple loopfilter on pixels with hev)
{
const int8x16_t simple_lf_delta =
vandq_s8(delta0, vreinterpretq_s8_u8(simple_lf_mask));
ApplyFilter2NoFlip_NEON(p0s, q0s, simple_lf_delta, &p0s, &q0s);
}
// do_filter6 part (complex loopfilter on pixels without hev)
{
// we use: (mask & hev_mask) ^ mask = mask & !hev_mask
const uint8x16_t complex_lf_mask = veorq_u8(simple_lf_mask, mask);
const int8x16_t complex_lf_delta =
vandq_s8(delta0, vreinterpretq_s8_u8(complex_lf_mask));
ApplyFilter6_NEON(p2s, p1s, p0s, q0s, q1s, q2s, complex_lf_delta,
op2, op1, op0, oq0, oq1, oq2);
}
}
// on macroblock edges
static void VFilter16_NEON(uint8_t* p, int stride,
int thresh, int ithresh, int hev_thresh) {
uint8x16_t p3, p2, p1, p0, q0, q1, q2, q3;
Load16x8_NEON(p, stride, &p3, &p2, &p1, &p0, &q0, &q1, &q2, &q3);
{
const uint8x16_t mask = NeedsFilter2_NEON(p3, p2, p1, p0, q0, q1, q2, q3,
ithresh, thresh);
const uint8x16_t hev_mask = NeedsHev_NEON(p1, p0, q0, q1, hev_thresh);
uint8x16_t op2, op1, op0, oq0, oq1, oq2;
DoFilter6_NEON(p2, p1, p0, q0, q1, q2, mask, hev_mask,
&op2, &op1, &op0, &oq0, &oq1, &oq2);
Store16x2_NEON(op2, op1, p - 2 * stride, stride);
Store16x2_NEON(op0, oq0, p + 0 * stride, stride);
Store16x2_NEON(oq1, oq2, p + 2 * stride, stride);
}
}
static void HFilter16_NEON(uint8_t* p, int stride,
int thresh, int ithresh, int hev_thresh) {
uint8x16_t p3, p2, p1, p0, q0, q1, q2, q3;
Load8x16_NEON(p, stride, &p3, &p2, &p1, &p0, &q0, &q1, &q2, &q3);
{
const uint8x16_t mask = NeedsFilter2_NEON(p3, p2, p1, p0, q0, q1, q2, q3,
ithresh, thresh);
const uint8x16_t hev_mask = NeedsHev_NEON(p1, p0, q0, q1, hev_thresh);
uint8x16_t op2, op1, op0, oq0, oq1, oq2;
DoFilter6_NEON(p2, p1, p0, q0, q1, q2, mask, hev_mask,
&op2, &op1, &op0, &oq0, &oq1, &oq2);
Store2x16_NEON(op2, op1, p - 2, stride);
Store2x16_NEON(op0, oq0, p + 0, stride);
Store2x16_NEON(oq1, oq2, p + 2, stride);
}
}
// on three inner edges
static void VFilter16i_NEON(uint8_t* p, int stride,
int thresh, int ithresh, int hev_thresh) {
uint32_t k;
uint8x16_t p3, p2, p1, p0;
Load16x4_NEON(p + 2 * stride, stride, &p3, &p2, &p1, &p0);
for (k = 3; k != 0; --k) {
uint8x16_t q0, q1, q2, q3;
p += 4 * stride;
Load16x4_NEON(p + 2 * stride, stride, &q0, &q1, &q2, &q3);
{
const uint8x16_t mask =
NeedsFilter2_NEON(p3, p2, p1, p0, q0, q1, q2, q3, ithresh, thresh);
const uint8x16_t hev_mask = NeedsHev_NEON(p1, p0, q0, q1, hev_thresh);
// p3 and p2 are not just temporary variables here: they will be
// re-used for next span. And q2/q3 will become p1/p0 accordingly.
DoFilter4_NEON(p1, p0, q0, q1, mask, hev_mask, &p1, &p0, &p3, &p2);
Store16x4_NEON(p1, p0, p3, p2, p, stride);
p1 = q2;
p0 = q3;
}
}
}
#if !defined(WORK_AROUND_GCC)
static void HFilter16i_NEON(uint8_t* p, int stride,
int thresh, int ithresh, int hev_thresh) {
uint32_t k;
uint8x16_t p3, p2, p1, p0;
Load4x16_NEON(p + 2, stride, &p3, &p2, &p1, &p0);
for (k = 3; k != 0; --k) {
uint8x16_t q0, q1, q2, q3;
p += 4;
Load4x16_NEON(p + 2, stride, &q0, &q1, &q2, &q3);
{
const uint8x16_t mask =
NeedsFilter2_NEON(p3, p2, p1, p0, q0, q1, q2, q3, ithresh, thresh);
const uint8x16_t hev_mask = NeedsHev_NEON(p1, p0, q0, q1, hev_thresh);
DoFilter4_NEON(p1, p0, q0, q1, mask, hev_mask, &p1, &p0, &p3, &p2);
Store4x16_NEON(p1, p0, p3, p2, p, stride);
p1 = q2;
p0 = q3;
}
}
}
#endif // !WORK_AROUND_GCC
// 8-pixels wide variant, for chroma filtering
static void VFilter8_NEON(uint8_t* u, uint8_t* v, int stride,
int thresh, int ithresh, int hev_thresh) {
uint8x16_t p3, p2, p1, p0, q0, q1, q2, q3;
Load8x8x2_NEON(u, v, stride, &p3, &p2, &p1, &p0, &q0, &q1, &q2, &q3);
{
const uint8x16_t mask = NeedsFilter2_NEON(p3, p2, p1, p0, q0, q1, q2, q3,
ithresh, thresh);
const uint8x16_t hev_mask = NeedsHev_NEON(p1, p0, q0, q1, hev_thresh);
uint8x16_t op2, op1, op0, oq0, oq1, oq2;
DoFilter6_NEON(p2, p1, p0, q0, q1, q2, mask, hev_mask,
&op2, &op1, &op0, &oq0, &oq1, &oq2);
Store8x2x2_NEON(op2, op1, u - 2 * stride, v - 2 * stride, stride);
Store8x2x2_NEON(op0, oq0, u + 0 * stride, v + 0 * stride, stride);
Store8x2x2_NEON(oq1, oq2, u + 2 * stride, v + 2 * stride, stride);
}
}
static void VFilter8i_NEON(uint8_t* u, uint8_t* v, int stride,
int thresh, int ithresh, int hev_thresh) {
uint8x16_t p3, p2, p1, p0, q0, q1, q2, q3;
u += 4 * stride;
v += 4 * stride;
Load8x8x2_NEON(u, v, stride, &p3, &p2, &p1, &p0, &q0, &q1, &q2, &q3);
{
const uint8x16_t mask = NeedsFilter2_NEON(p3, p2, p1, p0, q0, q1, q2, q3,
ithresh, thresh);
const uint8x16_t hev_mask = NeedsHev_NEON(p1, p0, q0, q1, hev_thresh);
uint8x16_t op1, op0, oq0, oq1;
DoFilter4_NEON(p1, p0, q0, q1, mask, hev_mask, &op1, &op0, &oq0, &oq1);
Store8x4x2_NEON(op1, op0, oq0, oq1, u, v, stride);
}
}
#if !defined(WORK_AROUND_GCC)
static void HFilter8_NEON(uint8_t* u, uint8_t* v, int stride,
int thresh, int ithresh, int hev_thresh) {
uint8x16_t p3, p2, p1, p0, q0, q1, q2, q3;
Load8x8x2T_NEON(u, v, stride, &p3, &p2, &p1, &p0, &q0, &q1, &q2, &q3);
{
const uint8x16_t mask = NeedsFilter2_NEON(p3, p2, p1, p0, q0, q1, q2, q3,
ithresh, thresh);
const uint8x16_t hev_mask = NeedsHev_NEON(p1, p0, q0, q1, hev_thresh);
uint8x16_t op2, op1, op0, oq0, oq1, oq2;
DoFilter6_NEON(p2, p1, p0, q0, q1, q2, mask, hev_mask,
&op2, &op1, &op0, &oq0, &oq1, &oq2);
Store6x8x2_NEON(op2, op1, op0, oq0, oq1, oq2, u, v, stride);
}
}
static void HFilter8i_NEON(uint8_t* u, uint8_t* v, int stride,
int thresh, int ithresh, int hev_thresh) {
uint8x16_t p3, p2, p1, p0, q0, q1, q2, q3;
u += 4;
v += 4;
Load8x8x2T_NEON(u, v, stride, &p3, &p2, &p1, &p0, &q0, &q1, &q2, &q3);
{
const uint8x16_t mask = NeedsFilter2_NEON(p3, p2, p1, p0, q0, q1, q2, q3,
ithresh, thresh);
const uint8x16_t hev_mask = NeedsHev_NEON(p1, p0, q0, q1, hev_thresh);
uint8x16_t op1, op0, oq0, oq1;
DoFilter4_NEON(p1, p0, q0, q1, mask, hev_mask, &op1, &op0, &oq0, &oq1);
Store4x8x2_NEON(op1, op0, oq0, oq1, u, v, stride);
}
}
#endif // !WORK_AROUND_GCC
//-----------------------------------------------------------------------------
// Inverse transforms (Paragraph 14.4)
// Technically these are unsigned but vqdmulh is only available in signed.
// vqdmulh returns high half (effectively >> 16) but also doubles the value,
// changing the >> 16 to >> 15 and requiring an additional >> 1.
// We use this to our advantage with kC2. The canonical value is 35468.
// However, the high bit is set so treating it as signed will give incorrect
// results. We avoid this by down shifting by 1 here to clear the highest bit.
// Combined with the doubling effect of vqdmulh we get >> 16.
// This can not be applied to kC1 because the lowest bit is set. Down shifting
// the constant would reduce precision.
// libwebp uses a trick to avoid some extra addition that libvpx does.
// Instead of:
// temp2 = ip[12] + ((ip[12] * cospi8sqrt2minus1) >> 16);
// libwebp adds 1 << 16 to cospi8sqrt2minus1 (kC1). However, this causes the