From e5728142a2048979f5c0c2149ce71ae952a092e1 Mon Sep 17 00:00:00 2001 From: Lasse Collin Date: Tue, 15 Jan 2008 14:02:22 +0200 Subject: [PATCH] Revised the fastpos code. It now uses the slightly faster table-based version from LZMA SDK 4.57. This should be fast on most systems. A simpler and smaller alternative version is also provided. On some CPUs this can be even a little faster than the default table-based version (see comments in fastpos.h), but on most systems the table-based code is faster. --- src/liblzma/common/init_encoder.c | 3 - src/liblzma/lzma/Makefile.am | 4 + src/liblzma/lzma/fastpos.h | 156 +++++++ src/liblzma/lzma/fastpos_table.c | 519 +++++++++++++++++++++ src/liblzma/lzma/fastpos_tablegen.c | 63 +++ src/liblzma/lzma/lzma_common.h | 3 +- src/liblzma/lzma/lzma_encoder.c | 1 + src/liblzma/lzma/lzma_encoder_getoptimum.c | 1 + src/liblzma/lzma/lzma_encoder_init.c | 22 - src/liblzma/lzma/lzma_encoder_private.h | 21 - 10 files changed, 746 insertions(+), 47 deletions(-) create mode 100644 src/liblzma/lzma/fastpos.h create mode 100644 src/liblzma/lzma/fastpos_table.c create mode 100644 src/liblzma/lzma/fastpos_tablegen.c diff --git a/src/liblzma/common/init_encoder.c b/src/liblzma/common/init_encoder.c index ec9fee6e..8a1644be 100644 --- a/src/liblzma/common/init_encoder.c +++ b/src/liblzma/common/init_encoder.c @@ -34,9 +34,6 @@ lzma_init_encoder(void) #if defined(HAVE_SMALL) && defined(HAVE_ENCODER) && defined(HAVE_FILTER_LZMA) lzma_rc_init(); #endif -#if defined(HAVE_ENCODER) && defined(HAVE_FILTER_LZMA) - lzma_fastpos_init(); -#endif already_initialized = true; return; diff --git a/src/liblzma/lzma/Makefile.am b/src/liblzma/lzma/Makefile.am index 48f3bb23..2d4a6ad7 100644 --- a/src/liblzma/lzma/Makefile.am +++ b/src/liblzma/lzma/Makefile.am @@ -12,6 +12,8 @@ ## Lesser General Public License for more details. ## +EXTRA_DIST = fastpos_tablegen.c + noinst_LTLIBRARIES = liblzma4.la liblzma4_la_CPPFLAGS = \ -I@top_srcdir@/src/liblzma/api \ @@ -26,6 +28,8 @@ liblzma4_la_SOURCES = \ if COND_MAIN_ENCODER liblzma4_la_SOURCES += \ + fastpos.h \ + fastpos_table.c \ lzma_encoder.h \ lzma_encoder.c \ lzma_encoder_presets.c \ diff --git a/src/liblzma/lzma/fastpos.h b/src/liblzma/lzma/fastpos.h new file mode 100644 index 00000000..57a94556 --- /dev/null +++ b/src/liblzma/lzma/fastpos.h @@ -0,0 +1,156 @@ +/////////////////////////////////////////////////////////////////////////////// +// +/// \file fastpos.h +/// \brief Kind of two-bit version of bit scan reverse +// +// Copyright (C) 1999-2007 Igor Pavlov +// Copyright (C) 2008 Lasse Collin +// +// This library is free software; you can redistribute it and/or +// modify it under the terms of the GNU Lesser General Public +// License as published by the Free Software Foundation; either +// version 2.1 of the License, or (at your option) any later version. +// +// This library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +// Lesser General Public License for more details. +// +/////////////////////////////////////////////////////////////////////////////// + +#ifndef LZMA_FASTPOS_H +#define LZMA_FASTPOS_H + +// LZMA encodes match distances (positions) by storing the highest two +// bits using a six-bit value [0, 63], and then the missing lower bits. +// Dictionary size is also stored using this encoding in the new .lzma +// file format header. +// +// fastpos.h provides a way to quickly find out the correct six-bit +// values. The following table gives some examples of this encoding: +// +// pos return +// 0 0 +// 1 1 +// 2 2 +// 3 3 +// 4 4 +// 5 4 +// 6 5 +// 7 5 +// 8 6 +// 11 6 +// 12 7 +// ... ... +// 15 7 +// 16 8 +// 17 8 +// ... ... +// 23 8 +// 24 9 +// 25 9 +// ... ... +// +// +// Provided functions or macros +// ---------------------------- +// +// get_pos_slot(pos) is the basic version. get_pos_slot_2(pos) +// assumes that pos >= FULL_DISTANCES, thus the result is at least +// FULL_DISTANCES_BITS * 2. Using get_pos_slot(pos) instead of +// get_pos_slot_2(pos) would give the same result, but get_pos_slot_2(pos) +// should be tiny bit faster due to the assumption being made. +// +// +// Size vs. speed +// -------------- +// +// With some CPUs that have fast BSR (bit scan reverse) instruction, the +// size optimized version is slightly faster than the bigger table based +// approach. Such CPUs include Intel Pentium Pro, Pentium II, Pentium III +// and Core 2 (possibly others). AMD K7 seems to have slower BSR, but that +// would still have speed roughly comparable to the table version. Older +// x86 CPUs like the original Pentium have very slow BSR; on those systems +// the table version is a lot faster. +// +// On some CPUs, the table version is a lot faster when using position +// dependent code, but with position independent code the size optimized +// version is slightly faster. This occurs at least on 32-bit SPARC (no +// ASM optimizations). +// +// I'm making the table version the default, because that has good speed +// on all systems I have tried. The size optimized version is sometimes +// slightly faster, but sometimes it is a lot slower. +// +// Finally, this code isn't a major bottle neck in LZMA encoding anyway. + +#ifdef HAVE_SMALL +# include "bsr.h" + +# define get_pos_slot(pos) ((pos) <= 4 ? (pos) : get_pos_slot_2(pos)) + +static inline uint32_t +get_pos_slot_2(uint32_t pos) +{ + uint32_t i; + lzma_bsr(i, pos); + return (i + i) + ((pos >> (i - 1)) & 1); +} + + +#else + +#define FASTPOS_BITS 13 + +extern const uint8_t lzma_fastpos[1 << FASTPOS_BITS]; + + +#define fastpos_shift(extra, n) \ + ((extra) + (n) * (FASTPOS_BITS - 1)) + +#define fastpos_limit(extra, n) \ + (UINT32_C(1) << (FASTPOS_BITS + fastpos_shift(extra, n))) + +#define fastpos_result(pos, extra, n) \ + lzma_fastpos[(pos) >> fastpos_shift(extra, n)] \ + + 2 * fastpos_shift(extra, n) + + +static inline uint32_t +get_pos_slot(uint32_t pos) +{ + // If it is small enough, we can pick the result directly from + // the precalculated table. + if (pos < fastpos_limit(0, 0)) + return lzma_fastpos[pos]; + + if (pos < fastpos_limit(0, 1)) + return fastpos_result(pos, 0, 1); + + return fastpos_result(pos, 0, 2); +} + + +#ifdef FULL_DISTANCES_BITS +static inline uint32_t +get_pos_slot_2(uint32_t pos) +{ + // FIXME: This assert() cannot be enabled at the moment, because + // lzma_getoptimum.c calls this function so that this assertion + // fails; however, it ignores the result of this function when + // this assert() would have failed. + // assert(pos >= FULL_DISTANCES); + + if (pos < fastpos_limit(FULL_DISTANCES_BITS - 1, 0)) + return fastpos_result(pos, FULL_DISTANCES_BITS - 1, 0); + + if (pos < fastpos_limit(FULL_DISTANCES_BITS - 1, 1)) + return fastpos_result(pos, FULL_DISTANCES_BITS - 1, 1); + + return fastpos_result(pos, FULL_DISTANCES_BITS - 1, 2); +} +#endif + +#endif + +#endif diff --git a/src/liblzma/lzma/fastpos_table.c b/src/liblzma/lzma/fastpos_table.c new file mode 100644 index 00000000..6a3ceac0 --- /dev/null +++ b/src/liblzma/lzma/fastpos_table.c @@ -0,0 +1,519 @@ +/* This file has been automatically generated by fastpos_tablegen.c. */ + +#include "common.h" +#include "fastpos.h" + +const uint8_t lzma_fastpos[1 << FASTPOS_BITS] = { + 0, 1, 2, 3, 4, 4, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, + 8, 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+/////////////////////////////////////////////////////////////////////////////// +// +/// \file fastpos_tablegen.c +/// \brief Generates the lzma_fastpos[] lookup table +// +// Copyright (C) 1999-2007 Igor Pavlov +// Copyright (C) 2008 Lasse Collin +// +// This library is free software; you can redistribute it and/or +// modify it under the terms of the GNU Lesser General Public +// License as published by the Free Software Foundation; either +// version 2.1 of the License, or (at your option) any later version. +// +// This library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +// Lesser General Public License for more details. +// +/////////////////////////////////////////////////////////////////////////////// + +#include +#include +#include +#include "fastpos.h" + + +int +main(void) +{ + uint8_t fastpos[1 << FASTPOS_BITS]; + + const uint8_t fast_slots = 2 * FASTPOS_BITS; + uint32_t c = 2; + + fastpos[0] = 0; + fastpos[1] = 1; + + for (uint8_t slot_fast = 2; slot_fast < fast_slots; ++slot_fast) { + const uint32_t k = 1 << ((slot_fast >> 1) - 1); + for (uint32_t j = 0; j < k; ++j, ++c) + fastpos[c] = slot_fast; + } + + printf("/* This file has been automatically generated " + "by fastpos_tablegen.c. */\n\n" + "#include \"common.h\"\n" + "#include \"fastpos.h\"\n\n" + "const uint8_t lzma_fastpos[1 << FASTPOS_BITS] = {"); + + for (size_t i = 0; i < (1 << FASTPOS_BITS); ++i) { + if (i % 16 == 0) + printf("\n\t"); + + printf("%3u", (unsigned int)(fastpos[i])); + + if (i != (1 << FASTPOS_BITS) - 1) + printf(","); + } + + printf("\n};\n"); + + return 0; +} diff --git a/src/liblzma/lzma/lzma_common.h b/src/liblzma/lzma/lzma_common.h index 60b1934c..2bb73157 100644 --- a/src/liblzma/lzma/lzma_common.h +++ b/src/liblzma/lzma/lzma_common.h @@ -55,7 +55,8 @@ #define END_POS_MODEL_INDEX 14 #define POS_MODELS (END_POS_MODEL_INDEX - START_POS_MODEL_INDEX) -#define FULL_DISTANCES (1 << (END_POS_MODEL_INDEX / 2)) +#define FULL_DISTANCES_BITS (END_POS_MODEL_INDEX / 2) +#define FULL_DISTANCES (1 << FULL_DISTANCES_BITS) #define POS_STATES_MAX (1 << LZMA_POS_BITS_MAX) diff --git a/src/liblzma/lzma/lzma_encoder.c b/src/liblzma/lzma/lzma_encoder.c index 5c80a2f8..8a5b0142 100644 --- a/src/liblzma/lzma/lzma_encoder.c +++ b/src/liblzma/lzma/lzma_encoder.c @@ -23,6 +23,7 @@ #include "lzma_encoder_private.h" +#include "fastpos.h" //////////// diff --git a/src/liblzma/lzma/lzma_encoder_getoptimum.c b/src/liblzma/lzma/lzma_encoder_getoptimum.c index b00f5c38..23a075f0 100644 --- a/src/liblzma/lzma/lzma_encoder_getoptimum.c +++ b/src/liblzma/lzma/lzma_encoder_getoptimum.c @@ -27,6 +27,7 @@ #include "lzma_encoder_private.h" +#include "fastpos.h" #define length_get_price(length_encoder, symbol, pos_state) \ diff --git a/src/liblzma/lzma/lzma_encoder_init.c b/src/liblzma/lzma/lzma_encoder_init.c index d7807529..dc66977a 100644 --- a/src/liblzma/lzma/lzma_encoder_init.c +++ b/src/liblzma/lzma/lzma_encoder_init.c @@ -21,28 +21,6 @@ #include "lzma_encoder_private.h" -uint8_t lzma_fastpos[1 << 11]; - -extern void -lzma_fastpos_init(void) -{ - static const uint8_t fast_slots = 22; - - int c = 2; - lzma_fastpos[0] = 0; - lzma_fastpos[1] = 1; - - for (uint8_t slot_fast = 2; slot_fast < fast_slots; ++slot_fast) { - const uint32_t k = (1 << ((slot_fast >> 1) - 1)); - - for (uint32_t j = 0; j < k; ++j, ++c) - lzma_fastpos[c] = slot_fast; - } - - return; -} - - /// \brief Initializes the length encoder static void length_encoder_reset(lzma_length_encoder *lencoder, diff --git a/src/liblzma/lzma/lzma_encoder_private.h b/src/liblzma/lzma/lzma_encoder_private.h index ba19b6ae..e403577c 100644 --- a/src/liblzma/lzma/lzma_encoder_private.h +++ b/src/liblzma/lzma/lzma_encoder_private.h @@ -45,27 +45,6 @@ do { \ } while (0) -#define get_pos_slot(pos) \ - ((pos) < (1 << 11) \ - ? lzma_fastpos[pos] \ - : ((pos) < (1 << 21) \ - ? lzma_fastpos[(pos) >> 10] + 20 \ - : lzma_fastpos[(pos) >> 20] + 40)) - - -#define get_pos_slot_2(pos) \ - ((pos) < (1 << 17) \ - ? lzma_fastpos[(pos) >> 6] + 12 \ - : ((pos) < (1 << 27) \ - ? lzma_fastpos[(pos) >> 16] + 32 \ - : lzma_fastpos[(pos) >> 26] + 52)) - - -/// This isn't modified once its contents have been -/// initialized by lzma_fastpos_init(). -extern uint8_t lzma_fastpos[1 << 11]; - - typedef struct { probability choice; probability choice2;