From 43dfe04e6209c691cf4fbe3072d4ee91271748f1 Mon Sep 17 00:00:00 2001 From: Lasse Collin Date: Fri, 21 Feb 2020 17:40:02 +0200 Subject: 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. --- src/liblzma/lzma/lzma_encoder_optimum_normal.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) (limited to 'src/liblzma') 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; -- cgit v1.2.3