From: Vsevolod Stakhov <vsevolod@highsecure.ru>
Date: Sat, 10 Dec 2016 12:14:45 +0000 (+0000)
Subject: [Minor] Improve int64 -> double conversion
X-Git-Tag: 1.5.0~629
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a32d867f9f22bd5da802e1d808d67a1b99aac075;p=thirdparty%2Frspamd.git

[Minor] Improve int64 -> double conversion
---

diff --git a/src/libutil/util.c b/src/libutil/util.c
index 3fc1c98bf1..36ca0cffca 100644
--- a/src/libutil/util.c
+++ b/src/libutil/util.c
@@ -2320,15 +2320,13 @@ rspamd_hash_seed (void)
 }
 
 static inline gdouble
-rspamd_double_from_int64 (guint64 rnd_int)
+rspamd_double_from_int64 (guint64 x)
 {
-	double res;
-	const double transform_bias = 2.2204460492503130808472633361816e-16;
-
-	res = rnd_int >> 12;
-	res *= transform_bias;
+	const union { guint i; double d; } u = {
+			.i = G_GUINT64_CONSTANT(0x3FF) << 52 | x >> 12
+	};
 
-	return res;
+	return u.d - 1.0;
 }
 
 gdouble