35bc02c6eb
Wrote SSE2 version of vp9_dc_only_idct_add_c function. In order to improve performance, clipped the absolute diff values to [0, 255]. This allowed us to keep the additions/subtractions in 8 bits. Test showed an over 2% decoder performance increase. Change-Id: Ie1a236d23d207e4ffcd1fc9f3d77462a9c7fe09d
77 lines
2.4 KiB
C
77 lines
2.4 KiB
C
/*
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* Copyright (c) 2012 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 <assert.h>
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#include <emmintrin.h> // SSE2
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#include "./vpx_config.h"
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#include "vpx/vpx_integer.h"
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#include "vp9/common/vp9_common.h"
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#include "vp9/common/vp9_idct.h"
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#if HAVE_SSE2
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// In order to improve performance, clip absolute diff values to [0, 255],
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// which allows to keep the additions/subtractions in 8 bits.
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void vp9_dc_only_idct_add_sse2(int input_dc, uint8_t *pred_ptr,
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uint8_t *dst_ptr, int pitch, int stride) {
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int a1;
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int16_t out;
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uint8_t abs_diff;
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__m128i p0, p1, p2, p3;
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unsigned int extended_diff;
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__m128i diff;
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out = dct_const_round_shift(input_dc * cospi_16_64);
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out = dct_const_round_shift(out * cospi_16_64);
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a1 = ROUND_POWER_OF_TWO(out, 4);
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// Read prediction data.
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p0 = _mm_cvtsi32_si128 (*(const int *)(pred_ptr + 0 * pitch));
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p1 = _mm_cvtsi32_si128 (*(const int *)(pred_ptr + 1 * pitch));
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p2 = _mm_cvtsi32_si128 (*(const int *)(pred_ptr + 2 * pitch));
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p3 = _mm_cvtsi32_si128 (*(const int *)(pred_ptr + 3 * pitch));
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// Unpack prediction data, and store 4x4 array in 1 XMM register.
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p0 = _mm_unpacklo_epi32(p0, p1);
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p2 = _mm_unpacklo_epi32(p2, p3);
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p0 = _mm_unpacklo_epi64(p0, p2);
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// Clip dc value to [0, 255] range. Then, do addition or subtraction
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// according to its sign.
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if (a1 >= 0) {
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abs_diff = (a1 > 255) ? 255 : a1;
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extended_diff = abs_diff * 0x01010101u;
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diff = _mm_shuffle_epi32(_mm_cvtsi32_si128((int)extended_diff), 0);
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p1 = _mm_adds_epu8(p0, diff);
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} else {
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abs_diff = (a1 < -255) ? 255 : -a1;
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extended_diff = abs_diff * 0x01010101u;
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diff = _mm_shuffle_epi32(_mm_cvtsi32_si128((int)extended_diff), 0);
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p1 = _mm_subs_epu8(p0, diff);
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}
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// Store results to dst.
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*(int *)dst_ptr = _mm_cvtsi128_si32(p1);
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dst_ptr += stride;
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p1 = _mm_srli_si128(p1, 4);
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*(int *)dst_ptr = _mm_cvtsi128_si32(p1);
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dst_ptr += stride;
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p1 = _mm_srli_si128(p1, 4);
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*(int *)dst_ptr = _mm_cvtsi128_si32(p1);
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dst_ptr += stride;
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p1 = _mm_srli_si128(p1, 4);
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*(int *)dst_ptr = _mm_cvtsi128_si32(p1);
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}
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#endif
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