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unlzma: speedup, by Pascal Bellard (pascal.bellard AT ads-lu.com)

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LZMA_FAST off: 10% faster and:
function                                             old     new   delta
rc_is_bit_1                                            -      92     +92
rc_do_normalize                                       45      81     +36
rc_update_bit_1                                       25       -     -25
rc_update_bit_0                                       30       -     -30
rc_is_bit_0_helper                                    38       -     -38
rc_get_bit                                            60      17     -43
rc_read                                               48       -     -48
unpack_lzma_stream                                  1768    1517    -251
------------------------------------------------------------------------------
(add/remove: 1/4 grow/shrink: 1/2 up/down: 128/-435)         Total: -307 bytes

LZMA_FAST on: 14% faster and:
unpack_lzma_stream                                  2301    2737    +436
rc_get_bit                                           106       -    -106
This commit is contained in:
Denis Vlasenko
2009-04-25 12:19:35 +00:00
parent 6fb5f01c0b
commit 9ac3dc764a
2 changed files with 60 additions and 98 deletions
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4
archival/Config.in
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@@ -283,8 +283,8 @@ config FEATURE_LZMA_FAST
default n
depends on UNLZMA
help
This option reduces decompression time by about 33% at the cost of
a 2K bigger binary.
This option reduces decompression time by about 25% at the cost of
a 1K bigger binary.
config UNZIP
bool "unzip"