From ac59ff802b40f7bfd6b9a774a7cc2438fad99e2b Mon Sep 17 00:00:00 2001
From: silinoron <none@none>
Date: Thu, 19 Aug 2010 16:13:10 -0700
Subject: Switch to using SIMD-oriented Fast Mersenne Twister for random number
 generation. In testing, reduced random number generation time by a factor of
 8-10. Drops support for processors older than Pentium 4. Drop Mersenne
 Twister library; use a C++ SFMT library.

--HG--
branch : trunk
---
 src/server/shared/CMakeLists.txt     |  1 -
 src/server/shared/Utilities/Util.cpp | 17 ++++++++---------
 2 files changed, 8 insertions(+), 10 deletions(-)

(limited to 'src/server/shared')

diff --git a/src/server/shared/CMakeLists.txt b/src/server/shared/CMakeLists.txt
index 7af5f3ebd83..c2a35117686 100644
--- a/src/server/shared/CMakeLists.txt
+++ b/src/server/shared/CMakeLists.txt
@@ -52,7 +52,6 @@ set(shared_STAT_SRCS
 
 include_directories(
   ${CMAKE_BINARY_DIR}
-  ${CMAKE_SOURCE_DIR}/dep/mersennetwister
   ${CMAKE_SOURCE_DIR}/dep/SFMT
   ${CMAKE_SOURCE_DIR}/dep/sockets/include
   ${CMAKE_SOURCE_DIR}/dep/utf8cpp
diff --git a/src/server/shared/Utilities/Util.cpp b/src/server/shared/Utilities/Util.cpp
index 97dfde6c92b..56922651331 100644
--- a/src/server/shared/Utilities/Util.cpp
+++ b/src/server/shared/Utilities/Util.cpp
@@ -22,36 +22,35 @@
 
 #include "socket_include.h"
 #include "utf8.h"
-//#include "SFMT.h"
-#include "MersenneTwister.h"
+#include "sfmt.h"
 #include <ace/TSS_T.h>
 
-typedef ACE_TSS<MTRand> MTRandTSS;
-static MTRandTSS mtRand;
+typedef ACE_TSS<SFMTRand> SFMTRandTSS;
+static SFMTRandTSS sfmtRand;
 
 int32 irand (int32 min, int32 max)
 {
-    return int32 (mtRand->randInt (max - min)) + min;
+    return int32(sfmtRand->IRandom(min, max));
 }
 
 uint32 urand (uint32 min, uint32 max)
 {
-    return mtRand->randInt (max - min) + min;
+    return sfmtRand->URandom(min, max);
 }
 
 int32 rand32 ()
 {
-    return mtRand->randInt ();
+    return int32(sfmtRand->BRandom());
 }
 
 double rand_norm(void)
 {
-    return mtRand->randExc ();
+    return sfmtRand->Random();
 }
 
 double rand_chance (void)
 {
-    return mtRand->randExc (100.0);
+    return sfmtRand->Random() * 100.0;
 }
 
 Tokens StrSplit(const std::string &src, const std::string &sep)
-- 
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