From 0733f4c9994db696420a405810d5f02c79ebc404 Mon Sep 17 00:00:00 2001 From: Lasse Collin Date: Sun, 22 Nov 2009 11:55:03 +0200 Subject: [PATCH] Make fastpos.h use tuklib_integer.h instead of bsr.h when --enable-small has been specified. --- src/liblzma/common/Makefile.inc | 1 - src/liblzma/common/bsr.h | 60 --------------------------------- src/liblzma/lzma/fastpos.h | 5 +-- 3 files changed, 1 insertion(+), 65 deletions(-) delete mode 100644 src/liblzma/common/bsr.h diff --git a/src/liblzma/common/Makefile.inc b/src/liblzma/common/Makefile.inc index 29f43ff..f154f82 100644 --- a/src/liblzma/common/Makefile.inc +++ b/src/liblzma/common/Makefile.inc @@ -8,7 +8,6 @@ liblzma_la_SOURCES += \ common/common.c \ common/common.h \ - common/bsr.h \ common/block_util.c \ common/easy_preset.c \ common/easy_preset.h \ diff --git a/src/liblzma/common/bsr.h b/src/liblzma/common/bsr.h deleted file mode 100644 index bef8641..0000000 --- a/src/liblzma/common/bsr.h +++ /dev/null @@ -1,60 +0,0 @@ -/////////////////////////////////////////////////////////////////////////////// -// -/// \file bsr.h -/// \brief Bit scan reverse -// -// Author: Lasse Collin -// -// This file has been put into the public domain. -// You can do whatever you want with this file. -// -/////////////////////////////////////////////////////////////////////////////// - -#ifndef LZMA_BSR_H -#define LZMA_BSR_H - -// NOTE: Both input and output variables for lzma_bsr must be uint32_t. - -#if defined(__GNUC__) && (defined (HAVE_ASM_X86) || defined(HAVE_ASM_X86_64)) -# define lzma_bsr(dest, n) \ - __asm__("bsrl %1, %0" : "=r" (dest) : "rm" (n)) - -#else -# define lzma_bsr(dest, n) dest = lzma_bsr_helper(n) - -static inline uint32_t -lzma_bsr_helper(uint32_t n) -{ - assert(n != 0); - - uint32_t i = 31; - - if ((n & UINT32_C(0xFFFF0000)) == 0) { - n <<= 16; - i = 15; - } - - if ((n & UINT32_C(0xFF000000)) == 0) { - n <<= 8; - i -= 8; - } - - if ((n & UINT32_C(0xF0000000)) == 0) { - n <<= 4; - i -= 4; - } - - if ((n & UINT32_C(0xC0000000)) == 0) { - n <<= 2; - i -= 2; - } - - if ((n & UINT32_C(0x80000000)) == 0) - --i; - - return i; -} - -#endif - -#endif diff --git a/src/liblzma/lzma/fastpos.h b/src/liblzma/lzma/fastpos.h index a95a00c..4aea231 100644 --- a/src/liblzma/lzma/fastpos.h +++ b/src/liblzma/lzma/fastpos.h @@ -76,15 +76,12 @@ // slightly faster, but sometimes it is a lot slower. #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); + const uint32_t i = bsr32(pos); return (i + i) + ((pos >> (i - 1)) & 1); } -- 2.39.2