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| author | Lasse Collin <lasse.collin@tukaani.org> | 2020-02-21 17:40:02 +0200 |
|---|---|---|
| committer | Lasse Collin <lasse.collin@tukaani.org> | 2020-03-11 12:05:57 +0200 |
| commit | fb9cada7cfade1156d6277717280e05b5cd342d6 (patch) | |
| tree | 2e73e90328f4a515cc2f10df0af74b23f81fc338 /src | |
| parent | Build: Add visibility.m4 from gnulib. (diff) | |
| download | xz-fb9cada7cfade1156d6277717280e05b5cd342d6.tar.xz | |
liblzma: Add more uses of lzma_memcmplen() to the normal mode of LZMA.
This gives a tiny encoder speed improvement. This could have been done
in 2014 after the commit 544aaa3d13554e8640f9caf7db717a96360ec0f6 but
it was forgotten.
Diffstat (limited to 'src')
| -rw-r--r-- | src/liblzma/lzma/lzma_encoder_optimum_normal.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/src/liblzma/lzma/lzma_encoder_optimum_normal.c b/src/liblzma/lzma/lzma_encoder_optimum_normal.c index 59f77343..101c8d47 100644 --- a/src/liblzma/lzma/lzma_encoder_optimum_normal.c +++ b/src/liblzma/lzma/lzma_encoder_optimum_normal.c @@ -636,9 +636,10 @@ helper2(lzma_lzma1_encoder *coder, uint32_t *reps, const uint8_t *buf, uint32_t len_test_2 = len_test + 1; const uint32_t limit = my_min(buf_avail_full, len_test_2 + nice_len); - for (; len_test_2 < limit - && buf[len_test_2] == buf_back[len_test_2]; - ++len_test_2) ; + // NOTE: len_test_2 may be greater than limit so the call to + // lzma_memcmplen() must be done conditionally. + if (len_test_2 < limit) + len_test_2 = lzma_memcmplen(buf, buf_back, len_test_2, limit); len_test_2 -= len_test + 1; @@ -732,9 +733,12 @@ helper2(lzma_lzma1_encoder *coder, uint32_t *reps, const uint8_t *buf, const uint32_t limit = my_min(buf_avail_full, len_test_2 + nice_len); - for (; len_test_2 < limit && - buf[len_test_2] == buf_back[len_test_2]; - ++len_test_2) ; + // NOTE: len_test_2 may be greater than limit + // so the call to lzma_memcmplen() must be + // done conditionally. + if (len_test_2 < limit) + len_test_2 = lzma_memcmplen(buf, buf_back, + len_test_2, limit); len_test_2 -= len_test + 1; |