Commit 9b4f9f45 authored by Jim Bankoski's avatar Jim Bankoski

Fill buffer speed up

Eliminates the byte by byte read from bool decoder,  by reading
in a size_t and then shifting it into place.

Change-Id: Id89241977103fc3b973e4ed172a5cbf246998e5d
parent 02b3b052
......@@ -7,12 +7,24 @@
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <stdlib.h>
#include "vpx_ports/mem.h"
#include "vpx_mem/vpx_mem.h"
#include "./vpx_config.h"
#include "vp9/decoder/vp9_reader.h"
#include "vpx_util/endian_inl.h"
#if CONFIG_BIG_ENDIAN
#define BIGENDIFY64(X) (X)
#define BIGENDIFY32(X) (X)
#else
#define BIGENDIFY64(X) BSwap64(X)
#define BIGENDIFY32(X) BSwap32(X)
#endif
int vp9_reader_init(vp9_reader *r,
const uint8_t *buffer,
size_t size,
......@@ -39,11 +51,9 @@ void vp9_reader_fill(vp9_reader *r) {
const uint8_t *buffer_start = buffer;
BD_VALUE value = r->value;
int count = r->count;
int shift = BD_VALUE_SIZE - CHAR_BIT - (count + CHAR_BIT);
int loop_end = 0;
const size_t bytes_left = buffer_end - buffer;
const size_t bits_left = bytes_left * CHAR_BIT;
const int x = (int)(shift + CHAR_BIT - bits_left);
int shift = BD_VALUE_SIZE - CHAR_BIT - (count + CHAR_BIT);
if (r->decrypt_cb) {
size_t n = MIN(sizeof(r->clear_buffer), bytes_left);
......@@ -51,17 +61,31 @@ void vp9_reader_fill(vp9_reader *r) {
buffer = r->clear_buffer;
buffer_start = r->clear_buffer;
}
if (bits_left > BD_VALUE_SIZE) {
#if UINTPTR_MAX == 0xffffffffffffffff
BD_VALUE big_endian_values = BIGENDIFY64(*((const BD_VALUE *) buffer));
#else
BD_VALUE big_endian_values = BIGENDIFY32(*((const BD_VALUE *) buffer));
#endif
const int bits = (shift & 0xfffffff8) + CHAR_BIT;
const BD_VALUE nv = big_endian_values >> (BD_VALUE_SIZE - bits);
count += bits;
buffer += (bits >> 3);
value = r->value | (nv << (shift & 0x7));
} else {
const int bits_over = (int)(shift + CHAR_BIT - bits_left);
int loop_end = 0;
if (bits_over >= 0) {
count += LOTS_OF_BITS;
loop_end = bits_over;
}
if (x >= 0) {
count += LOTS_OF_BITS;
loop_end = x;
}
if (x < 0 || bits_left) {
while (shift >= loop_end) {
count += CHAR_BIT;
value |= (BD_VALUE)*buffer++ << shift;
shift -= CHAR_BIT;
if (bits_over < 0 || bits_left) {
while (shift >= loop_end) {
count += CHAR_BIT;
value |= (BD_VALUE)*buffer++ << shift;
shift -= CHAR_BIT;
}
}
}
......
// Copyright 2014 Google Inc. All Rights Reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the COPYING 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.
// -----------------------------------------------------------------------------
//
// Endian related functions.
#ifndef VPX_UTIL_ENDIAN_INL_H_
#define VPX_UTIL_ENDIAN_INL_H_
#include <stdlib.h>
#include "./vpx_config.h"
#include "vpx/vpx_integer.h"
#if defined(__GNUC__)
# define LOCAL_GCC_VERSION ((__GNUC__ << 8) | __GNUC_MINOR__)
# define LOCAL_GCC_PREREQ(maj, min) \
(LOCAL_GCC_VERSION >= (((maj) << 8) | (min)))
#else
# define LOCAL_GCC_VERSION 0
# define LOCAL_GCC_PREREQ(maj, min) 0
#endif
#ifdef __clang__
# define LOCAL_CLANG_VERSION ((__clang_major__ << 8) | __clang_minor__)
# define LOCAL_CLANG_PREREQ(maj, min) \
(LOCAL_CLANG_VERSION >= (((maj) << 8) | (min)))
#else
# define LOCAL_CLANG_VERSION 0
# define LOCAL_CLANG_PREREQ(maj, min) 0
#endif // __clang__
// some endian fix (e.g.: mips-gcc doesn't define __BIG_ENDIAN__)
#if !defined(WORDS_BIGENDIAN) && \
(defined(__BIG_ENDIAN__) || defined(_M_PPC) || \
(defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)))
#define WORDS_BIGENDIAN
#endif
#if defined(WORDS_BIGENDIAN)
#define HToLE32 BSwap32
#define HToLE16 BSwap16
#else
#define HToLE32(x) (x)
#define HToLE16(x) (x)
#endif
// clang-3.3 and gcc-4.3 have builtin functions for swap32/swap64
#if LOCAL_GCC_PREREQ(4, 3) || LOCAL_CLANG_PREREQ(3, 3)
#define HAVE_BUILTIN_BSWAP32
#define HAVE_BUILTIN_BSWAP64
#endif
// clang-3.3 and gcc-4.8 have a builtin function for swap16
#if LOCAL_GCC_PREREQ(4, 8) || LOCAL_CLANG_PREREQ(3, 3)
#define HAVE_BUILTIN_BSWAP16
#endif
static INLINE uint16_t BSwap16(uint16_t x) {
#if defined(HAVE_BUILTIN_BSWAP16)
return __builtin_bswap16(x);
#elif defined(_MSC_VER)
return _byteswap_ushort(x);
#else
// gcc will recognize a 'rorw $8, ...' here:
return (x >> 8) | ((x & 0xff) << 8);
#endif // HAVE_BUILTIN_BSWAP16
}
static INLINE uint32_t BSwap32(uint32_t x) {
#if HAVE_MIPS32
uint32_t ret;
__asm__ volatile (
"wsbh %[ret], %[x] \n\t"
"rotr %[ret], %[ret], 16 \n\t"
: [ret]"=r"(ret)
: [x]"r"(x)
);
return ret;
#elif defined(HAVE_BUILTIN_BSWAP32)
return __builtin_bswap32(x);
#elif defined(__i386__) || defined(__x86_64__)
uint32_t swapped_bytes;
__asm__ volatile("bswap %0" : "=r"(swapped_bytes) : "0"(x));
return swapped_bytes;
#elif defined(_MSC_VER)
return (uint32_t)_byteswap_ulong(x);
#else
return (x >> 24) | ((x >> 8) & 0xff00) | ((x << 8) & 0xff0000) | (x << 24);
#endif // HAVE_BUILTIN_BSWAP32
}
static INLINE uint64_t BSwap64(uint64_t x) {
#if defined(HAVE_BUILTIN_BSWAP64)
return __builtin_bswap64(x);
#elif defined(__x86_64__)
uint64_t swapped_bytes;
__asm__ volatile("bswapq %0" : "=r"(swapped_bytes) : "0"(x));
return swapped_bytes;
#elif defined(_MSC_VER)
return (uint64_t)_byteswap_uint64(x);
#else // generic code for swapping 64-bit values (suggested by bdb@)
x = ((x & 0xffffffff00000000ull) >> 32) | ((x & 0x00000000ffffffffull) << 32);
x = ((x & 0xffff0000ffff0000ull) >> 16) | ((x & 0x0000ffff0000ffffull) << 16);
x = ((x & 0xff00ff00ff00ff00ull) >> 8) | ((x & 0x00ff00ff00ff00ffull) << 8);
return x;
#endif // HAVE_BUILTIN_BSWAP64
}
#endif // VPX_UTIL_ENDIAN_INL_H_
......@@ -11,3 +11,4 @@
UTIL_SRCS-yes += vpx_util.mk
UTIL_SRCS-yes += vpx_thread.c
UTIL_SRCS-yes += vpx_thread.h
UTIL_SRCS-yes += endian_inl.h
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