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vpx/vp8/decoder/asm_dec_offsets.c

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Initial WebM release
2010-05-18 17:58:33 +02:00
/*
clarify *_offsets.asm differences it's difficult to mux the *_offsets.c files because of header conflicts. make three instead, name them consistently and partititon the contents to allow building them as required. Change-Id: I8f9768c09279f934f44b6c5b0ec363f7943bb796
2011-02-04 23:44:31 +01:00
* Copyright (c) 2011 The WebM project authors. All Rights Reserved.
Initial WebM release
2010-05-18 17:58:33 +02:00
*
cosmetics: trim trailing whitespace When the license headers were updated, they accidentally contained trailing whitespace, so unfortunately we have to touch all the files again. Change-Id: I236c05fade06589e417179c0444cb39b09e4200d
2010-06-18 18:39:21 +02:00
* Use of this source code is governed by a BSD-style license
LICENSE: update with latest text Change-Id: Ieebea089095d9073b3a94932791099f614ce120c
2010-06-04 22:19:40 +02:00
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
cosmetics: trim trailing whitespace When the license headers were updated, they accidentally contained trailing whitespace, so unfortunately we have to touch all the files again. Change-Id: I236c05fade06589e417179c0444cb39b09e4200d
2010-06-18 18:39:21 +02:00
* in the file PATENTS. All contributing project authors may
LICENSE: update with latest text Change-Id: Ieebea089095d9073b3a94932791099f614ce120c
2010-06-04 22:19:40 +02:00
* be found in the AUTHORS file in the root of the source tree.
Initial WebM release
2010-05-18 17:58:33 +02:00
*/
use GCC inline magic Better fix for #326. ICC happens to support the inline magic Change-Id: Ic367eea608c88d89475cb7b05d73500d2a1bc42b
2011-06-08 20:43:34 +02:00
#include "vpx_ports/asm_offsets.h"
Initial WebM release
2010-05-18 17:58:33 +02:00
#include "onyxd_int.h"
use GCC inline magic Better fix for #326. ICC happens to support the inline magic Change-Id: Ic367eea608c88d89475cb7b05d73500d2a1bc42b
2011-06-08 20:43:34 +02:00
BEGIN
Initial WebM release
2010-05-18 17:58:33 +02:00
Change bitreader to use a larger window. Change bitreading functions to use a larger window which is refilled less often. This makes it cheap enough to do bounds checking each time the window is refilled, which avoids the need to copy the input into a large circular buffer. This uses less memory and speeds up the total decode time by 1.6% on an ARM11, 2.8% on a Cortex A8, and 2.2% on x86-32, but less than 1% on x86-64. Inlining vp8dx_bool_decoder_fill() has a big penalty on x86-32, as does moving the refill loop to the front of vp8dx_decode_bool(). However, having the refill loop between computation of the split values and the branch in vp8_decode_mb_tokens() is a big win on ARM (presumably due to memory latency and code size: refilling after normalization duplicates the code in the DECODE_AND_BRANCH_IF_ZERO and DECODE_AND_LOOP_IF_ZERO cases. Unfortunately, refilling at the end of vp8dx_bool_decoder_fill() and at the beginning of each decode step in vp8_decode_mb_tokens() means the latter requires an extra refill at the end. Platform-specific versions could avoid the problem, but would require most of detokenize.c to be duplicated. Change-Id: I16c782a63376f2a15b78f8086d899b987204c1c7
2010-05-05 23:58:19 +02:00
DEFINE(bool_decoder_user_buffer_end, offsetof(BOOL_DECODER, user_buffer_end));
DEFINE(bool_decoder_user_buffer, offsetof(BOOL_DECODER, user_buffer));
Initial WebM release
2010-05-18 17:58:33 +02:00
DEFINE(bool_decoder_value, offsetof(BOOL_DECODER, value));
DEFINE(bool_decoder_count, offsetof(BOOL_DECODER, count));
Change bitreader to use a larger window. Change bitreading functions to use a larger window which is refilled less often. This makes it cheap enough to do bounds checking each time the window is refilled, which avoids the need to copy the input into a large circular buffer. This uses less memory and speeds up the total decode time by 1.6% on an ARM11, 2.8% on a Cortex A8, and 2.2% on x86-32, but less than 1% on x86-64. Inlining vp8dx_bool_decoder_fill() has a big penalty on x86-32, as does moving the refill loop to the front of vp8dx_decode_bool(). However, having the refill loop between computation of the split values and the branch in vp8_decode_mb_tokens() is a big win on ARM (presumably due to memory latency and code size: refilling after normalization duplicates the code in the DECODE_AND_BRANCH_IF_ZERO and DECODE_AND_LOOP_IF_ZERO cases. Unfortunately, refilling at the end of vp8dx_bool_decoder_fill() and at the beginning of each decode step in vp8_decode_mb_tokens() means the latter requires an extra refill at the end. Platform-specific versions could avoid the problem, but would require most of detokenize.c to be duplicated. Change-Id: I16c782a63376f2a15b78f8086d899b987204c1c7
2010-05-05 23:58:19 +02:00
DEFINE(bool_decoder_range, offsetof(BOOL_DECODER, range));
Initial WebM release
2010-05-18 17:58:33 +02:00
use GCC inline magic Better fix for #326. ICC happens to support the inline magic Change-Id: Ic367eea608c88d89475cb7b05d73500d2a1bc42b
2011-06-08 20:43:34 +02:00
END
/* add asserts for any offset that is not supported by assembly code */
/* add asserts for any size that is not supported by assembly code */
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