ref: f0279ceb9282cbaa316640c386765cfcc1cfef81
dir: /vpx_dsp/arm/mem_neon.h/
/*
* Copyright (c) 2017 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE 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.
*/
#ifndef VPX_DSP_ARM_MEM_NEON_H_
#define VPX_DSP_ARM_MEM_NEON_H_
#include <arm_neon.h>
#include <assert.h>
#include <string.h>
#include "./vpx_config.h"
#include "vpx/vpx_integer.h"
#include "vpx_dsp/vpx_dsp_common.h"
// Helper functions used to load tran_low_t into int16, narrowing if necessary.
static INLINE int16x8x2_t load_tran_low_to_s16x2q(const tran_low_t *buf) {
#if CONFIG_VP9_HIGHBITDEPTH
const int32x4x2_t v0 = vld2q_s32(buf);
const int32x4x2_t v1 = vld2q_s32(buf + 8);
const int16x4_t s0 = vmovn_s32(v0.val[0]);
const int16x4_t s1 = vmovn_s32(v0.val[1]);
const int16x4_t s2 = vmovn_s32(v1.val[0]);
const int16x4_t s3 = vmovn_s32(v1.val[1]);
int16x8x2_t res;
res.val[0] = vcombine_s16(s0, s2);
res.val[1] = vcombine_s16(s1, s3);
return res;
#else
return vld2q_s16(buf);
#endif
}
static INLINE int16x8_t load_tran_low_to_s16q(const tran_low_t *buf) {
#if CONFIG_VP9_HIGHBITDEPTH
const int32x4_t v0 = vld1q_s32(buf);
const int32x4_t v1 = vld1q_s32(buf + 4);
const int16x4_t s0 = vmovn_s32(v0);
const int16x4_t s1 = vmovn_s32(v1);
return vcombine_s16(s0, s1);
#else
return vld1q_s16(buf);
#endif
}
static INLINE int16x4_t load_tran_low_to_s16d(const tran_low_t *buf) {
#if CONFIG_VP9_HIGHBITDEPTH
const int32x4_t v0 = vld1q_s32(buf);
return vmovn_s32(v0);
#else
return vld1_s16(buf);
#endif
}
static INLINE void store_s16q_to_tran_low(tran_low_t *buf, const int16x8_t a) {
#if CONFIG_VP9_HIGHBITDEPTH
const int32x4_t v0 = vmovl_s16(vget_low_s16(a));
const int32x4_t v1 = vmovl_s16(vget_high_s16(a));
vst1q_s32(buf, v0);
vst1q_s32(buf + 4, v1);
#else
vst1q_s16(buf, a);
#endif
}
// Propagate type information to the compiler. Without this the compiler may
// assume the required alignment of uint32_t (4 bytes) and add alignment hints
// to the memory access.
//
// This is used for functions operating on uint8_t which wish to load or store 4
// values at a time but which may not be on 4 byte boundaries.
static INLINE void uint32_to_mem(uint8_t *buf, uint32_t a) {
memcpy(buf, &a, 4);
}
// Load 4 sets of 4 bytes when alignment is not guaranteed.
static INLINE uint8x16_t load_unaligned_u8q(const uint8_t *buf, int stride) {
uint32_t a;
uint32x4_t a_u32 = vdupq_n_u32(0);
if (stride == 4) return vld1q_u8(buf);
memcpy(&a, buf, 4);
buf += stride;
a_u32 = vld1q_lane_u32(&a, a_u32, 0);
memcpy(&a, buf, 4);
buf += stride;
a_u32 = vld1q_lane_u32(&a, a_u32, 1);
memcpy(&a, buf, 4);
buf += stride;
a_u32 = vld1q_lane_u32(&a, a_u32, 2);
memcpy(&a, buf, 4);
buf += stride;
a_u32 = vld1q_lane_u32(&a, a_u32, 3);
return vreinterpretq_u8_u32(a_u32);
}
// Store 4 sets of 4 bytes when alignment is not guaranteed.
static INLINE void store_unaligned_u8q(uint8_t *buf, int stride,
const uint8x16_t a) {
const uint32x4_t a_u32 = vreinterpretq_u32_u8(a);
if (stride == 4) {
vst1q_u8(buf, a);
return;
}
uint32_to_mem(buf, vgetq_lane_u32(a_u32, 0));
buf += stride;
uint32_to_mem(buf, vgetq_lane_u32(a_u32, 1));
buf += stride;
uint32_to_mem(buf, vgetq_lane_u32(a_u32, 2));
buf += stride;
uint32_to_mem(buf, vgetq_lane_u32(a_u32, 3));
}
// Load 2 sets of 4 bytes when alignment is guaranteed.
static INLINE uint8x8_t load_u8(const uint8_t *buf, int stride) {
uint32x2_t a = vdup_n_u32(0);
assert(!((intptr_t)buf % sizeof(uint32_t)));
assert(!(stride % sizeof(uint32_t)));
a = vld1_lane_u32((const uint32_t *)buf, a, 0);
buf += stride;
a = vld1_lane_u32((const uint32_t *)buf, a, 1);
return vreinterpret_u8_u32(a);
}
// Store 2 sets of 4 bytes when alignment is guaranteed.
static INLINE void store_u8(uint8_t *buf, int stride, const uint8x8_t a) {
uint32x2_t a_u32 = vreinterpret_u32_u8(a);
assert(!((intptr_t)buf % sizeof(uint32_t)));
assert(!(stride % sizeof(uint32_t)));
vst1_lane_u32((uint32_t *)buf, a_u32, 0);
buf += stride;
vst1_lane_u32((uint32_t *)buf, a_u32, 1);
}
#endif // VPX_DSP_ARM_MEM_NEON_H_