From: Vsevolod Stakhov <vsevolod@highsecure.ru>
Date: Mon, 10 Oct 2016 19:38:24 +0000 (+0100)
Subject: [Minor] Use log2 as it is slightly faster
X-Git-Tag: 1.4.0~285
X-Git-Url: https://source.dussan.org/?a=commitdiff_plain;h=1e185524aab1ef6387a96902c41291ea5cc0ffec;p=rspamd.git

[Minor] Use log2 as it is slightly faster
---

diff --git a/src/libstat/classifiers/bayes.c b/src/libstat/classifiers/bayes.c
index 40dcdf36f..35e061e08 100644
--- a/src/libstat/classifiers/bayes.c
+++ b/src/libstat/classifiers/bayes.c
@@ -140,6 +140,7 @@ bayes_classify_token (struct rspamd_classifier *ctx,
 		fw = feature_weight[tok->window_idx % G_N_ELEMENTS (feature_weight)];
 		norm_sum = (spam_freq + ham_freq) * (spam_freq + ham_freq);
 		norm_sub = (spam_freq - ham_freq) * (spam_freq - ham_freq);
+
 		w = (norm_sub) / (norm_sum) *
 				(fw * total_count) / (4.0 * (1.0 + fw * total_count));
 		bayes_spam_prob = PROB_COMBINE (spam_prob, total_count, w, 0.5);
@@ -147,8 +148,9 @@ bayes_classify_token (struct rspamd_classifier *ctx,
 		w = (norm_sub) / (norm_sum) *
 				(fw * total_count) / (4.0 * (1.0 + fw * total_count));
 		bayes_ham_prob = PROB_COMBINE (ham_prob, total_count, w, 0.5);
-		cl->spam_prob += log (bayes_spam_prob);
-		cl->ham_prob += log (bayes_ham_prob);
+
+		cl->spam_prob += log2 (bayes_spam_prob);
+		cl->ham_prob += log2 (bayes_ham_prob);
 		cl->processed_tokens ++;
 
 		msg_debug_bayes ("token: weight: %f, total_count: %L, "