ref: 3c9a424e6e9c70afc2f7586093d440ec3fba7dfe
dir: /vp8/encoder/arm/neon/shortfdct_neon.c/
/*
* Copyright (c) 2014 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.
*/
#include <arm_neon.h>
void vp8_short_fdct4x4_neon(
int16_t *input,
int16_t *output,
int pitch) {
int16x4_t d0s16, d1s16, d2s16, d3s16, d4s16, d5s16, d6s16, d7s16;
int16x4_t d16s16, d17s16, d26s16, dEmptys16;
uint16x4_t d4u16;
int16x8_t q0s16, q1s16;
int32x4_t q9s32, q10s32, q11s32, q12s32;
int16x4x2_t v2tmp0, v2tmp1;
int32x2x2_t v2tmp2, v2tmp3;
d16s16 = vdup_n_s16(5352);
d17s16 = vdup_n_s16(2217);
q9s32 = vdupq_n_s32(14500);
q10s32 = vdupq_n_s32(7500);
q11s32 = vdupq_n_s32(12000);
q12s32 = vdupq_n_s32(51000);
// Part one
pitch >>= 1;
d0s16 = vld1_s16(input);
input += pitch;
d1s16 = vld1_s16(input);
input += pitch;
d2s16 = vld1_s16(input);
input += pitch;
d3s16 = vld1_s16(input);
v2tmp2 = vtrn_s32(vreinterpret_s32_s16(d0s16),
vreinterpret_s32_s16(d2s16));
v2tmp3 = vtrn_s32(vreinterpret_s32_s16(d1s16),
vreinterpret_s32_s16(d3s16));
v2tmp0 = vtrn_s16(vreinterpret_s16_s32(v2tmp2.val[0]), // d0
vreinterpret_s16_s32(v2tmp3.val[0])); // d1
v2tmp1 = vtrn_s16(vreinterpret_s16_s32(v2tmp2.val[1]), // d2
vreinterpret_s16_s32(v2tmp3.val[1])); // d3
d4s16 = vadd_s16(v2tmp0.val[0], v2tmp1.val[1]);
d5s16 = vadd_s16(v2tmp0.val[1], v2tmp1.val[0]);
d6s16 = vsub_s16(v2tmp0.val[1], v2tmp1.val[0]);
d7s16 = vsub_s16(v2tmp0.val[0], v2tmp1.val[1]);
d4s16 = vshl_n_s16(d4s16, 3);
d5s16 = vshl_n_s16(d5s16, 3);
d6s16 = vshl_n_s16(d6s16, 3);
d7s16 = vshl_n_s16(d7s16, 3);
d0s16 = vadd_s16(d4s16, d5s16);
d2s16 = vsub_s16(d4s16, d5s16);
q9s32 = vmlal_s16(q9s32, d7s16, d16s16);
q10s32 = vmlal_s16(q10s32, d7s16, d17s16);
q9s32 = vmlal_s16(q9s32, d6s16, d17s16);
q10s32 = vmlsl_s16(q10s32, d6s16, d16s16);
d1s16 = vshrn_n_s32(q9s32, 12);
d3s16 = vshrn_n_s32(q10s32, 12);
// Part two
v2tmp2 = vtrn_s32(vreinterpret_s32_s16(d0s16),
vreinterpret_s32_s16(d2s16));
v2tmp3 = vtrn_s32(vreinterpret_s32_s16(d1s16),
vreinterpret_s32_s16(d3s16));
v2tmp0 = vtrn_s16(vreinterpret_s16_s32(v2tmp2.val[0]), // d0
vreinterpret_s16_s32(v2tmp3.val[0])); // d1
v2tmp1 = vtrn_s16(vreinterpret_s16_s32(v2tmp2.val[1]), // d2
vreinterpret_s16_s32(v2tmp3.val[1])); // d3
d4s16 = vadd_s16(v2tmp0.val[0], v2tmp1.val[1]);
d5s16 = vadd_s16(v2tmp0.val[1], v2tmp1.val[0]);
d6s16 = vsub_s16(v2tmp0.val[1], v2tmp1.val[0]);
d7s16 = vsub_s16(v2tmp0.val[0], v2tmp1.val[1]);
d26s16 = vdup_n_s16(7);
d4s16 = vadd_s16(d4s16, d26s16);
d0s16 = vadd_s16(d4s16, d5s16);
d2s16 = vsub_s16(d4s16, d5s16);
q11s32 = vmlal_s16(q11s32, d7s16, d16s16);
q12s32 = vmlal_s16(q12s32, d7s16, d17s16);
dEmptys16 = vdup_n_s16(0);
d4u16 = vceq_s16(d7s16, dEmptys16);
d0s16 = vshr_n_s16(d0s16, 4);
d2s16 = vshr_n_s16(d2s16, 4);
q11s32 = vmlal_s16(q11s32, d6s16, d17s16);
q12s32 = vmlsl_s16(q12s32, d6s16, d16s16);
d4u16 = vmvn_u16(d4u16);
d1s16 = vshrn_n_s32(q11s32, 16);
d1s16 = vsub_s16(d1s16, vreinterpret_s16_u16(d4u16));
d3s16 = vshrn_n_s32(q12s32, 16);
q0s16 = vcombine_s16(d0s16, d1s16);
q1s16 = vcombine_s16(d2s16, d3s16);
vst1q_s16(output, q0s16);
vst1q_s16(output + 8, q1s16);
return;
}
void vp8_short_fdct8x4_neon(
int16_t *input,
int16_t *output,
int pitch) {
int16x4_t d0s16, d1s16, d2s16, d3s16, d4s16, d5s16, d6s16, d7s16;
int16x4_t d16s16, d17s16, d26s16, d27s16, d28s16, d29s16;
uint16x4_t d28u16, d29u16;
uint16x8_t q14u16;
int16x8_t q0s16, q1s16, q2s16, q3s16;
int16x8_t q11s16, q12s16, q13s16, q14s16, q15s16, qEmptys16;
int32x4_t q9s32, q10s32, q11s32, q12s32;
int16x8x2_t v2tmp0, v2tmp1;
int32x4x2_t v2tmp2, v2tmp3;
d16s16 = vdup_n_s16(5352);
d17s16 = vdup_n_s16(2217);
q9s32 = vdupq_n_s32(14500);
q10s32 = vdupq_n_s32(7500);
// Part one
pitch >>= 1;
q0s16 = vld1q_s16(input);
input += pitch;
q1s16 = vld1q_s16(input);
input += pitch;
q2s16 = vld1q_s16(input);
input += pitch;
q3s16 = vld1q_s16(input);
v2tmp2 = vtrnq_s32(vreinterpretq_s32_s16(q0s16),
vreinterpretq_s32_s16(q2s16));
v2tmp3 = vtrnq_s32(vreinterpretq_s32_s16(q1s16),
vreinterpretq_s32_s16(q3s16));
v2tmp0 = vtrnq_s16(vreinterpretq_s16_s32(v2tmp2.val[0]), // q0
vreinterpretq_s16_s32(v2tmp3.val[0])); // q1
v2tmp1 = vtrnq_s16(vreinterpretq_s16_s32(v2tmp2.val[1]), // q2
vreinterpretq_s16_s32(v2tmp3.val[1])); // q3
q11s16 = vaddq_s16(v2tmp0.val[0], v2tmp1.val[1]);
q12s16 = vaddq_s16(v2tmp0.val[1], v2tmp1.val[0]);
q13s16 = vsubq_s16(v2tmp0.val[1], v2tmp1.val[0]);
q14s16 = vsubq_s16(v2tmp0.val[0], v2tmp1.val[1]);
q11s16 = vshlq_n_s16(q11s16, 3);
q12s16 = vshlq_n_s16(q12s16, 3);
q13s16 = vshlq_n_s16(q13s16, 3);
q14s16 = vshlq_n_s16(q14s16, 3);
q0s16 = vaddq_s16(q11s16, q12s16);
q2s16 = vsubq_s16(q11s16, q12s16);
q11s32 = q9s32;
q12s32 = q10s32;
d26s16 = vget_low_s16(q13s16);
d27s16 = vget_high_s16(q13s16);
d28s16 = vget_low_s16(q14s16);
d29s16 = vget_high_s16(q14s16);
q9s32 = vmlal_s16(q9s32, d28s16, d16s16);
q10s32 = vmlal_s16(q10s32, d28s16, d17s16);
q11s32 = vmlal_s16(q11s32, d29s16, d16s16);
q12s32 = vmlal_s16(q12s32, d29s16, d17s16);
q9s32 = vmlal_s16(q9s32, d26s16, d17s16);
q10s32 = vmlsl_s16(q10s32, d26s16, d16s16);
q11s32 = vmlal_s16(q11s32, d27s16, d17s16);
q12s32 = vmlsl_s16(q12s32, d27s16, d16s16);
d2s16 = vshrn_n_s32(q9s32, 12);
d6s16 = vshrn_n_s32(q10s32, 12);
d3s16 = vshrn_n_s32(q11s32, 12);
d7s16 = vshrn_n_s32(q12s32, 12);
q1s16 = vcombine_s16(d2s16, d3s16);
q3s16 = vcombine_s16(d6s16, d7s16);
// Part two
q9s32 = vdupq_n_s32(12000);
q10s32 = vdupq_n_s32(51000);
v2tmp2 = vtrnq_s32(vreinterpretq_s32_s16(q0s16),
vreinterpretq_s32_s16(q2s16));
v2tmp3 = vtrnq_s32(vreinterpretq_s32_s16(q1s16),
vreinterpretq_s32_s16(q3s16));
v2tmp0 = vtrnq_s16(vreinterpretq_s16_s32(v2tmp2.val[0]), // q0
vreinterpretq_s16_s32(v2tmp3.val[0])); // q1
v2tmp1 = vtrnq_s16(vreinterpretq_s16_s32(v2tmp2.val[1]), // q2
vreinterpretq_s16_s32(v2tmp3.val[1])); // q3
q11s16 = vaddq_s16(v2tmp0.val[0], v2tmp1.val[1]);
q12s16 = vaddq_s16(v2tmp0.val[1], v2tmp1.val[0]);
q13s16 = vsubq_s16(v2tmp0.val[1], v2tmp1.val[0]);
q14s16 = vsubq_s16(v2tmp0.val[0], v2tmp1.val[1]);
q15s16 = vdupq_n_s16(7);
q11s16 = vaddq_s16(q11s16, q15s16);
q0s16 = vaddq_s16(q11s16, q12s16);
q1s16 = vsubq_s16(q11s16, q12s16);
q11s32 = q9s32;
q12s32 = q10s32;
d0s16 = vget_low_s16(q0s16);
d1s16 = vget_high_s16(q0s16);
d2s16 = vget_low_s16(q1s16);
d3s16 = vget_high_s16(q1s16);
d0s16 = vshr_n_s16(d0s16, 4);
d4s16 = vshr_n_s16(d1s16, 4);
d2s16 = vshr_n_s16(d2s16, 4);
d6s16 = vshr_n_s16(d3s16, 4);
d26s16 = vget_low_s16(q13s16);
d27s16 = vget_high_s16(q13s16);
d28s16 = vget_low_s16(q14s16);
d29s16 = vget_high_s16(q14s16);
q9s32 = vmlal_s16(q9s32, d28s16, d16s16);
q10s32 = vmlal_s16(q10s32, d28s16, d17s16);
q11s32 = vmlal_s16(q11s32, d29s16, d16s16);
q12s32 = vmlal_s16(q12s32, d29s16, d17s16);
q9s32 = vmlal_s16(q9s32, d26s16, d17s16);
q10s32 = vmlsl_s16(q10s32, d26s16, d16s16);
q11s32 = vmlal_s16(q11s32, d27s16, d17s16);
q12s32 = vmlsl_s16(q12s32, d27s16, d16s16);
d1s16 = vshrn_n_s32(q9s32, 16);
d3s16 = vshrn_n_s32(q10s32, 16);
d5s16 = vshrn_n_s32(q11s32, 16);
d7s16 = vshrn_n_s32(q12s32, 16);
qEmptys16 = vdupq_n_s16(0);
q14u16 = vceqq_s16(q14s16, qEmptys16);
q14u16 = vmvnq_u16(q14u16);
d28u16 = vget_low_u16(q14u16);
d29u16 = vget_high_u16(q14u16);
d1s16 = vsub_s16(d1s16, vreinterpret_s16_u16(d28u16));
d5s16 = vsub_s16(d5s16, vreinterpret_s16_u16(d29u16));
q0s16 = vcombine_s16(d0s16, d1s16);
q1s16 = vcombine_s16(d2s16, d3s16);
q2s16 = vcombine_s16(d4s16, d5s16);
q3s16 = vcombine_s16(d6s16, d7s16);
vst1q_s16(output, q0s16);
vst1q_s16(output + 8, q1s16);
vst1q_s16(output + 16, q2s16);
vst1q_s16(output + 24, q3s16);
return;
}