123 lines
4.2 KiB
C
123 lines
4.2 KiB
C
/*
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* Copyright (c) 2014 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include <arm_neon.h>
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static const int16_t cospi8sqrt2minus1 = 20091;
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static const int16_t sinpi8sqrt2 = 35468;
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void vp8_short_idct4x4llm_neon(
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int16_t *input,
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unsigned char *pred_ptr,
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int pred_stride,
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unsigned char *dst_ptr,
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int dst_stride) {
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int i;
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uint32x2_t d6u32 = vdup_n_u32(0);
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uint8x8_t d1u8;
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int16x4_t d2, d3, d4, d5, d10, d11, d12, d13;
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uint16x8_t q1u16;
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int16x8_t q1s16, q2s16, q3s16, q4s16;
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int32x2x2_t v2tmp0, v2tmp1;
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int16x4x2_t v2tmp2, v2tmp3;
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d2 = vld1_s16(input);
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d3 = vld1_s16(input + 4);
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d4 = vld1_s16(input + 8);
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d5 = vld1_s16(input + 12);
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// 1st for loop
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q1s16 = vcombine_s16(d2, d4); // Swap d3 d4 here
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q2s16 = vcombine_s16(d3, d5);
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q3s16 = vqdmulhq_n_s16(q2s16, sinpi8sqrt2);
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q4s16 = vqdmulhq_n_s16(q2s16, cospi8sqrt2minus1);
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d12 = vqadd_s16(vget_low_s16(q1s16), vget_high_s16(q1s16)); // a1
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d13 = vqsub_s16(vget_low_s16(q1s16), vget_high_s16(q1s16)); // b1
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q3s16 = vshrq_n_s16(q3s16, 1);
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q4s16 = vshrq_n_s16(q4s16, 1);
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q3s16 = vqaddq_s16(q3s16, q2s16);
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q4s16 = vqaddq_s16(q4s16, q2s16);
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d10 = vqsub_s16(vget_low_s16(q3s16), vget_high_s16(q4s16)); // c1
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d11 = vqadd_s16(vget_high_s16(q3s16), vget_low_s16(q4s16)); // d1
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d2 = vqadd_s16(d12, d11);
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d3 = vqadd_s16(d13, d10);
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d4 = vqsub_s16(d13, d10);
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d5 = vqsub_s16(d12, d11);
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v2tmp0 = vtrn_s32(vreinterpret_s32_s16(d2), vreinterpret_s32_s16(d4));
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v2tmp1 = vtrn_s32(vreinterpret_s32_s16(d3), vreinterpret_s32_s16(d5));
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v2tmp2 = vtrn_s16(vreinterpret_s16_s32(v2tmp0.val[0]),
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vreinterpret_s16_s32(v2tmp1.val[0]));
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v2tmp3 = vtrn_s16(vreinterpret_s16_s32(v2tmp0.val[1]),
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vreinterpret_s16_s32(v2tmp1.val[1]));
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// 2nd for loop
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q1s16 = vcombine_s16(v2tmp2.val[0], v2tmp3.val[0]);
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q2s16 = vcombine_s16(v2tmp2.val[1], v2tmp3.val[1]);
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q3s16 = vqdmulhq_n_s16(q2s16, sinpi8sqrt2);
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q4s16 = vqdmulhq_n_s16(q2s16, cospi8sqrt2minus1);
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d12 = vqadd_s16(vget_low_s16(q1s16), vget_high_s16(q1s16)); // a1
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d13 = vqsub_s16(vget_low_s16(q1s16), vget_high_s16(q1s16)); // b1
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q3s16 = vshrq_n_s16(q3s16, 1);
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q4s16 = vshrq_n_s16(q4s16, 1);
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q3s16 = vqaddq_s16(q3s16, q2s16);
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q4s16 = vqaddq_s16(q4s16, q2s16);
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d10 = vqsub_s16(vget_low_s16(q3s16), vget_high_s16(q4s16)); // c1
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d11 = vqadd_s16(vget_high_s16(q3s16), vget_low_s16(q4s16)); // d1
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d2 = vqadd_s16(d12, d11);
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d3 = vqadd_s16(d13, d10);
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d4 = vqsub_s16(d13, d10);
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d5 = vqsub_s16(d12, d11);
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d2 = vrshr_n_s16(d2, 3);
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d3 = vrshr_n_s16(d3, 3);
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d4 = vrshr_n_s16(d4, 3);
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d5 = vrshr_n_s16(d5, 3);
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v2tmp0 = vtrn_s32(vreinterpret_s32_s16(d2), vreinterpret_s32_s16(d4));
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v2tmp1 = vtrn_s32(vreinterpret_s32_s16(d3), vreinterpret_s32_s16(d5));
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v2tmp2 = vtrn_s16(vreinterpret_s16_s32(v2tmp0.val[0]),
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vreinterpret_s16_s32(v2tmp1.val[0]));
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v2tmp3 = vtrn_s16(vreinterpret_s16_s32(v2tmp0.val[1]),
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vreinterpret_s16_s32(v2tmp1.val[1]));
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q1s16 = vcombine_s16(v2tmp2.val[0], v2tmp2.val[1]);
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q2s16 = vcombine_s16(v2tmp3.val[0], v2tmp3.val[1]);
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// dc_only_idct_add
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for (i = 0; i < 2; i++, q1s16 = q2s16) {
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d6u32 = vld1_lane_u32((const uint32_t *)pred_ptr, d6u32, 0);
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pred_ptr += pred_stride;
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d6u32 = vld1_lane_u32((const uint32_t *)pred_ptr, d6u32, 1);
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pred_ptr += pred_stride;
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q1u16 = vaddw_u8(vreinterpretq_u16_s16(q1s16),
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vreinterpret_u8_u32(d6u32));
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d1u8 = vqmovun_s16(vreinterpretq_s16_u16(q1u16));
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vst1_lane_u32((uint32_t *)dst_ptr, vreinterpret_u32_u8(d1u8), 0);
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dst_ptr += dst_stride;
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vst1_lane_u32((uint32_t *)dst_ptr, vreinterpret_u32_u8(d1u8), 1);
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dst_ptr += dst_stride;
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}
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return;
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}
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