ranlxd random generator

configure.ac

@@ -25,6 +25,16 @@ m4_ifdef([AM_PROG_AR],[AM_PROG_AR])
 
 LT_INIT
 
+# Option to enable SSE random generator
+AC_ARG_ENABLE([SSE],
+	[AS_HELP_STRING([--enable-SSE],
+		[compiles SSE version of ranlux random generator])],
+	[AC_DEFINE([HAVE_SSE],
+				[1],
+				[Define to 1 if your CPU support SSE instructions.])],
+	[]
+)
+
 # Get compilers informations
 AX_COMPILER_VENDOR
 AC_DEFINE_UNQUOTED([C_COMP_VENDOR],["$ax_cv_c_compiler_vendor"],

examples/Makefile.am

@@ -18,7 +18,8 @@ noinst_PROGRAMS =           \
     exCompiledDoubleFunction\
     exMat                   \
     exMathInterpreter       \
-    exPlot
+    exPlot                  \
+    exRand
 
 exCompiledDoubleFunction_SOURCES = exCompiledDoubleFunction.cpp
 exCompiledDoubleFunction_CFLAGS  = -g -O2
@@ -36,4 +37,8 @@ exPlot_SOURCES                   = exPlot.cpp
 exPlot_CFLAGS                    = -g -O2
 exPlot_LDFLAGS                   = -L../latan/.libs -llatan
 
+exRand_SOURCES                   = exRand.cpp
+exRand_CFLAGS                    = -g -O2
+exRand_LDFLAGS                   = -L../latan/.libs -llatan
+
 ACLOCAL_AMFLAGS = -I .buildutils/m4

examples/exRand.cpp

@@ -0,0 +1,42 @@
+#include <iostream>
+#include <latan/Io.hpp>
+#include <latan/RandGen.hpp>
+
+using namespace std;
+using namespace Latan;
+
+const int    seqLength     = 25;
+const int    saveStep      = 9;
+const string stateFileName = "exRand.seed";
+
+int main(void)
+{
+    RandGen::State state;
+    RandGen gen[2];
+    AsciiFile stateFile(stateFileName, File::Mode::write|File::Mode::read);
+    
+    cout << "- GENERATOR STATE I/O TESTS" << endl;
+    cout << "-- generating a " << seqLength << " steps random sequence..."
+         << endl;
+    for (int i = 0; i < seqLength; ++i)
+    {
+        if (i == saveStep)
+        {
+            state = gen[0].getState();
+            stateFile.save(state, "exRand");
+            cout << "generator state after step " << saveStep - 1
+                 << " saved in '" << stateFileName << "'" << endl;
+        }
+        cout << "step " << i << "\t: " << gen[0].uniform() <<endl;
+    }
+    cout << "-- setting up another generator from '" << stateFileName << "'..."
+         << endl;
+    gen[1].setState(stateFile.read<RandGen::State>("exRand"));
+    cout << "-- generating a " << seqLength << " steps random sequence..."
+         << endl;
+    for (int i = 0; i < seqLength; ++i)
+    {
+        cout << "step " << i << "\t: " << gen[1].uniform() <<endl;
+    }
+    return EXIT_SUCCESS;
+}

latan/Io.cpp

@@ -115,12 +115,22 @@ AsciiFile::~AsciiFile(void)
 void AsciiFile::save(const DMat &m, const std::string &name)
 {
     checkWritability();
+    isParsed_ = false;
     fileStream_ << "#L latan_begin mat " << name << endl;
     fileStream_ << m.cols() << endl;
     fileStream_ << m << endl;
     fileStream_ << "#L latan_end mat " << endl;
 }
 
+void AsciiFile::save(const RandGen::State &state, const std::string &name)
+{
+    checkWritability();
+    isParsed_ = false;
+    fileStream_ << "#L latan_begin rg_state " << name << endl;
+    fileStream_ << state << endl;
+    fileStream_ << "#L latan_end rg_state " << endl;
+}
+
 // tests ///////////////////////////////////////////////////////////////////////
 bool AsciiFile::isOpen() const
 {
@@ -208,6 +218,7 @@ int _ioAscii_parse(AsciiFile::AsciiParserState* state);
 
 void AsciiFile::parse()
 {
+    fileStream_.seekg(0);
     _ioAscii_parse(state_);
     isParsed_ = true;
 }

latan/Io.hpp

@@ -29,6 +29,7 @@
 #include <latan/IoObject.hpp>
 #include <latan/Mat.hpp>
 #include <latan/ParserState.hpp>
+#include <latan/RandGen.hpp>
 #include <latan/Sample.hpp>
 
 BEGIN_NAMESPACE
@@ -64,6 +65,7 @@ public:
     template <typename IoT>
     const IoT &  read(const std::string &name);
     virtual void save(const DMat &m, const std::string &name)               = 0;
+    virtual void save(const RandGen::State &state, const std::string &name) = 0;
     // tests
     virtual bool isOpen(void) const = 0;
     // IO
@@ -125,6 +127,7 @@ public:
         // public members
         std::stack<DMat>   dMatBuf;
         std::stack<double> doubleBuf;
+        std::stack<int>    intBuf;
     private:
         // allocation/deallocation functions defined in IoAsciiLexer.lpp
         virtual void initScanner(void);
@@ -138,6 +141,7 @@ public:
     virtual ~AsciiFile(void);
     // access
     virtual void save(const DMat &m, const std::string &name);
+    virtual void save(const RandGen::State &state, const std::string &name);
     // tests
     virtual bool isOpen(void) const;
     // IO

latan/IoAsciiLexer.lpp

@@ -75,6 +75,7 @@ BLANK   [ \t]
 <MARK>latan_begin  {BEGIN(TYPE); RETTOK(OPEN);}
 <MARK>latan_end    {BEGIN(TYPE); RETTOK(CLOSE);}
 <TYPE>mat          {BEGIN(INITIAL); RETTOK(MAT);}
+<TYPE>rg_state     {BEGIN(INITIAL); RETTOK(RG_STATE);}
 <*>\n              {yylloc->last_column = 0;}
 <*>[ \t]
 <*>.               {yylval->val_char = yytext[0]; RETTOK(ERR);}

latan/IoAsciiParser.ypp

@@ -23,6 +23,8 @@
     #include <cstring>
     #include <latan/Global.hpp>
 	#include <latan/IO.hpp>
+    #include <latan/Mat.hpp>
+    #include <latan/RandGen.hpp>
     #include <latan/Sample.hpp>
 
     using namespace std;
@@ -52,6 +54,7 @@
 %token <val_int>    INT
 %token <val_str>    ID
 %token              MAT
+%token              RG_STATE
 %token              OPEN
 
 %{
@@ -74,26 +77,64 @@
 
 datas:
       /* empty string */
-    | datas mat
+    | datas data
+	;
+
+data:
+      mat
+    | rg_state
     ;
 
 mat:
       OPEN MAT ID INT floats CLOSE MAT
     {
         const int nRow = state->doubleBuf.size()/$INT, nCol = $INT;
-        (*state->data)[$ID] = new DMat(nRow,nCol);
+        (*state->data)[$ID] = new DMat(nRow, nCol);
-        DMat &M = static_cast<DMat &>(*((*state->data)[$ID]));
+        DMat &m = static_cast<DMat &>(*((*state->data)[$ID]));
-        int r,i,j;
+        int r, i, j;
         
         r = 0;
         while (!state->doubleBuf.empty())
         {
             j = r % nCol;
             i = (r - j)/nCol;
-            M(i,j) = state->doubleBuf.top();
+            m(i, j) = state->doubleBuf.top();
             state->doubleBuf.pop();
             ++r;
         }
+        if (r != nRow*nCol)
+        {
+            LATAN_ERROR(Range, "matrix '" + *state->streamName + ":" + $ID +
+                        "' has a wrong size");
+        }
+    }
+    ;
+
+rg_state:
+      OPEN RG_STATE ID ints CLOSE RG_STATE
+    {
+        (*state->data)[$ID] = new RandGen::State;
+        RandGen::State &rgState =
+            static_cast<RandGen::State &>(*((*state->data)[$ID]));
+        
+        for (int i = 0; i < RLXG_STATE_SIZE; ++i)
+        {
+            if (!state->intBuf.empty())
+            {
+                rgState[i] = state->intBuf.top();
+                state->intBuf.pop();
+            }
+            else
+            {
+                LATAN_ERROR(Range, "random generator state '" +
+                            *state->streamName + ":" + $ID + "' is too short");
+            }
+        }
+        if (!state->intBuf.empty())
+        {
+            LATAN_ERROR(Range, "random generator state '" +
+                        *state->streamName + ":" + $ID + "' is too long");
+        }
     }
     ;
 
@@ -103,3 +144,8 @@ floats:
     | FLOAT {state->doubleBuf.push($1);}
     | INT   {state->doubleBuf.push(static_cast<double>($1));}
     ;
+
+ints:
+      INT ints {state->intBuf.push($1);}
+    | INT {state->intBuf.push($1);}
+    ;

latan/IoObject.hpp

@@ -35,7 +35,8 @@ public:
         {
             noType  = 0,
             dMat    = 1,
-            sample = 2
+            sample  = 2,
+            rgState = 3
         };
     };
 public:

latan/Makefile.am

@@ -39,6 +39,7 @@ liblatan_la_SOURCES =   \
     MathParser.ypp      \
     MathLexer.lpp       \
     Plot.cpp            \
+    RandGen.cpp         \
     Sample.cpp          \
 	../config.h
 liblatan_ladir = $(pkgincludedir)
@@ -53,6 +54,7 @@ liblatan_la_HEADERS =   \
     MathInterpreter.hpp \
     ParserState.hpp     \
     Plot.hpp            \
+    RandGen.hpp         \
     Sample.hpp
 liblatan_la_CFLAGS = $(COM_CFLAGS)
 liblatan_la_CXXFLAGS = $(COM_CXXFLAGS)

latan/RandGen.cpp

@@ -0,0 +1,696 @@
+/*
+ * RandGen.cpp, part of LatAnalyze 3
+ *
+ * Copyright (C) 2013 - 2014 Antonin Portelli
+ *
+ * LatAnalyze 3 is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * LatAnalyze 3 is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with LatAnalyze 3.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <latan/RandGen.hpp>
+#include <latan/includes.hpp>
+
+#ifndef RLXD_LEVEL
+#define RLXD_LEVEL 1
+#endif
+
+using namespace std;
+using namespace Latan;
+
+/******************************************************************************
+ *                        RandGen implementation                              *
+ ******************************************************************************/
+// State implentation //////////////////////////////////////////////////////////
+RandGen::State::State(void)
+{}
+
+RandGen::State::~State(void)
+{}
+
+unsigned int RandGen::State::getType(void) const
+{
+    return IoType::rgState;
+}
+
+// RanLxd implementation ///////////////////////////////////////////////////////
+RandGen::RanLxd::RanLxd(void)
+: init(0)
+{
+    // avoid a warning in the SSE case
+    one_bit = 0.0;
+}
+
+/****************************************************************************/
+/* Copyright (C) 2005 Martin Luescher (GPL)
+ * This software is distributed under the terms of the GNU General Public
+ * License (GPL)
+ *
+ * Random number generator "ranlxd". See the notes
+ *
+ *   "User's guide for ranlxs and ranlxd v3.2" (December 2005)
+ *
+ *   "Algorithms used in ranlux v3.0" (May 2001)
+ *
+ * for a detailed description
+ *
+ * The functions are
+ *
+ *   void ranlxd(double r[],int n)
+ *     Computes the next n double-precision random numbers and
+ *     assigns them to the elements r[0],...,r[n-1] of the array r[]
+ *
+ *   void rlxd_init(int level,int seed)
+ *     Initialization of the generator
+ *
+ *   int rlxd_size(void)
+ *     Returns the number of integers required to save the state of
+ *     the generator
+ *
+ *   void rlxd_get(int state[])
+ *     Extracts the current state of the generator and stores the
+ *     information in the array state[N] where N>=rlxd_size()
+ *
+ *   void rlxd_reset(int state[])
+ *     Resets the generator to the state defined by the array state[N]
+ */
+
+#ifdef HAVE_SSE
+
+#define STEP(pi,pj)                                     \
+__asm__ __volatile__ ("movaps %4, %%xmm4 \n\t"          \
+                      "movaps %%xmm2, %%xmm3 \n\t"      \
+                      "subps %2, %%xmm4 \n\t"           \
+                      "movaps %%xmm1, %%xmm5 \n\t"      \
+                      "cmpps $0x6, %%xmm4, %%xmm2 \n\t" \
+                      "andps %%xmm2, %%xmm5 \n\t"       \
+                      "subps %%xmm3, %%xmm4 \n\t"       \
+                      "andps %%xmm0, %%xmm2 \n\t"       \
+                      "addps %%xmm4, %%xmm5 \n\t"       \
+                      "movaps %%xmm5, %0 \n\t"          \
+                      "movaps %5, %%xmm6 \n\t"          \
+                      "movaps %%xmm2, %%xmm3 \n\t"      \
+                      "subps %3, %%xmm6 \n\t"           \
+                      "movaps %%xmm1, %%xmm7 \n\t"      \
+                      "cmpps $0x6, %%xmm6, %%xmm2 \n\t" \
+                      "andps %%xmm2, %%xmm7 \n\t"       \
+                      "subps %%xmm3, %%xmm6 \n\t"       \
+                      "andps %%xmm0, %%xmm2 \n\t"       \
+                      "addps %%xmm6, %%xmm7 \n\t"       \
+                      "movaps %%xmm7, %1"               \
+                      :                                 \
+                      "=m" ((*pi).c1),                  \
+                      "=m" ((*pi).c2)                   \
+                      :                                 \
+                      "m" ((*pi).c1),                   \
+                      "m" ((*pi).c2),                   \
+                      "m" ((*pj).c1),                   \
+                      "m" ((*pj).c2)                    \
+                      :                                 \
+                      "xmm2", "xmm3", "xmm4", "xmm5", "xmm6", "xmm7")
+
+void RandGen::RanLxd::error(int no) const
+{
+    switch(no)
+    {
+        case 1:
+            LATAN_ERROR(Range, "Bad choice of luxury level (should be 1 or 2)");
+            break;
+        case 2:
+            LATAN_ERROR(Range, "Bad choice of seed (should be between 1 and 2^31-1)");
+            break;
+        case 3:
+            LATAN_ERROR(Runtime, "Undefined state (ranlxd is not initialized)");
+            break;
+        case 5:
+            LATAN_ERROR(Logic, "Unexpected input data");
+            break;
+    }
+}
+
+void RandGen::RanLxd::update(void)
+{
+    int k,kmax;
+    rlxd_dble_vec_t *pmin,*pmax,*pi,*pj;
+    
+    kmax=rlxd_pr;
+    pmin=&rlxd_x.vec[0];
+    pmax=pmin+12;
+    pi=&rlxd_x.vec[ir];
+    pj=&rlxd_x.vec[jr];
+    
+    __asm__ __volatile__ ("movaps %0, %%xmm0 \n\t"
+                          "movaps %1, %%xmm1 \n\t"
+                          "movaps %2, %%xmm2"
+                          :
+                          :
+                          "m" (one_bit_sse),
+                          "m" (one_sse),
+                          "m" (carry)
+                          :
+                          "xmm0", "xmm1", "xmm2");
+    
+    for (k=0;k<kmax;k++)
+    {
+        STEP(pi,pj);
+        pi+=1;
+        pj+=1;
+        if (pi==pmax)
+            pi=pmin;
+        if (pj==pmax)
+            pj=pmin;
+    }
+    
+    __asm__ __volatile__ ("movaps %%xmm2, %0"
+                          :
+                          "=m" (carry));
+    
+    ir+=prm;
+    jr+=prm;
+    if (ir>=12)
+        ir-=12;
+    if (jr>=12)
+        jr-=12;
+    is=8*ir;
+    is_old=is;
+}
+
+void RandGen::RanLxd::define_constants(void)
+{
+    int k;
+    float b;
+    
+    one_sse.c1=1.0f;
+    one_sse.c2=1.0f;
+    one_sse.c3=1.0f;
+    one_sse.c4=1.0f;
+    
+    b=(float)(ldexp(1.0,-24));
+    one_bit_sse.c1=b;
+    one_bit_sse.c2=b;
+    one_bit_sse.c3=b;
+    one_bit_sse.c4=b;
+    
+    for (k=0;k<96;k++)
+    {
+        next[k]=(k+1)%96;
+        if ((k%4)==3)
+            next[k]=(k+5)%96;
+    }
+}
+
+void RandGen::RanLxd::rlxd_init(int level,int seed)
+{
+    int i,k,l;
+    int ibit,jbit,xbit[31];
+    int ix,iy;
+    
+    define_constants();
+    
+    if (level==1)
+        rlxd_pr=202;
+    else if (level==2)
+        rlxd_pr=397;
+    else
+        error(1);
+    
+    i=seed;
+    
+    for (k=0;k<31;k++)
+    {
+        xbit[k]=i%2;
+        i/=2;
+    }
+    
+    if ((seed<=0)||(i!=0))
+        error(2);
+    
+    ibit=0;
+    jbit=18;
+    
+    for (i=0;i<4;i++)
+    {
+        for (k=0;k<24;k++)
+        {
+            ix=0;
+            
+            for (l=0;l<24;l++)
+            {
+                iy=xbit[ibit];
+                ix=2*ix+iy;
+                
+                xbit[ibit]=(xbit[ibit]+xbit[jbit])%2;
+                ibit=(ibit+1)%31;
+                jbit=(jbit+1)%31;
+            }
+            
+            if ((k%4)!=i)
+                ix=16777215-ix;
+            
+            rlxd_x.num[4*k+i]=(float)(ldexp((double)(ix),-24));
+        }
+    }
+    
+    carry.c1=0.0f;
+    carry.c2=0.0f;
+    carry.c3=0.0f;
+    carry.c4=0.0f;
+    
+    ir=0;
+    jr=7;
+    is=91;
+    is_old=0;
+    prm=rlxd_pr%12;
+    init=1;
+}
+
+void RandGen::RanLxd::ranlxd(double r[],int n)
+{
+    int k;
+    
+    if (init==0)
+        rlxd_init(1,1);
+    
+    for (k=0;k<n;k++)
+    {
+        is=next[is];
+        if (is==is_old)
+            update();
+        r[k]=(double)(rlxd_x.num[is+4])+(double)(one_bit_sse.c1*rlxd_x.num[is]);
+    }
+}
+
+int RandGen::RanLxd::rlxd_size(void) const
+{
+    return(RLXG_STATE_SIZE);
+}
+
+void RandGen::RanLxd::rlxd_get(int state[]) const
+{
+    int k;
+    float base;
+    
+    if (init==0)
+        error(3);
+    
+    base=(float)(ldexp(1.0,24));
+    state[0]=rlxd_size();
+    
+    for (k=0;k<96;k++)
+        state[k+1]=(int)(base*rlxd_x.num[k]);
+    
+    state[97]=(int)(base*carry.c1);
+    state[98]=(int)(base*carry.c2);
+    state[99]=(int)(base*carry.c3);
+    state[100]=(int)(base*carry.c4);
+    
+    state[101]=rlxd_pr;
+    state[102]=ir;
+    state[103]=jr;
+    state[104]=is;
+}
+
+void RandGen::RanLxd::rlxd_reset(const int state[])
+{
+    int k;
+    
+    define_constants();
+    
+    if (state[0]!=rlxd_size())
+        error(5);
+    
+    for (k=0;k<96;k++)
+    {
+        if ((state[k+1]<0)||(state[k+1]>=167777216))
+            error(5);
+        
+        rlxd_x.num[k]=(float)(ldexp((double)(state[k+1]),-24));
+    }
+    
+    if (((state[97]!=0)&&(state[97]!=1))||
+        ((state[98]!=0)&&(state[98]!=1))||
+        ((state[99]!=0)&&(state[99]!=1))||
+        ((state[100]!=0)&&(state[100]!=1)))
+        error(5);
+    
+    carry.c1=(float)(ldexp((double)(state[97]),-24));
+    carry.c2=(float)(ldexp((double)(state[98]),-24));
+    carry.c3=(float)(ldexp((double)(state[99]),-24));
+    carry.c4=(float)(ldexp((double)(state[100]),-24));
+    
+    rlxd_pr=state[101];
+    ir=state[102];
+    jr=state[103];
+    is=state[104];
+    is_old=8*ir;
+    prm=rlxd_pr%12;
+    init=1;
+    
+    if (((rlxd_pr!=202)&&(rlxd_pr!=397))||
+        (ir<0)||(ir>11)||(jr<0)||(jr>11)||(jr!=((ir+7)%12))||
+        (is<0)||(is>91))
+        error(5);
+}
+
+#else
+
+#define BASE 0x1000000
+#define MASK 0xffffff
+
+#define STEP(pi,pj) \
+d=(*pj).c1.c1-(*pi).c1.c1-carry.c1; \
+(*pi).c2.c1+=(d<0); \
+d+=BASE; \
+(*pi).c1.c1=d&MASK; \
+d=(*pj).c1.c2-(*pi).c1.c2-carry.c2; \
+(*pi).c2.c2+=(d<0); \
+d+=BASE; \
+(*pi).c1.c2=d&MASK; \
+d=(*pj).c1.c3-(*pi).c1.c3-carry.c3; \
+(*pi).c2.c3+=(d<0); \
+d+=BASE; \
+(*pi).c1.c3=d&MASK; \
+d=(*pj).c1.c4-(*pi).c1.c4-carry.c4; \
+(*pi).c2.c4+=(d<0); \
+d+=BASE; \
+(*pi).c1.c4=d&MASK; \
+d=(*pj).c2.c1-(*pi).c2.c1; \
+carry.c1=(d<0); \
+d+=BASE; \
+(*pi).c2.c1=d&MASK; \
+d=(*pj).c2.c2-(*pi).c2.c2; \
+carry.c2=(d<0); \
+d+=BASE; \
+(*pi).c2.c2=d&MASK; \
+d=(*pj).c2.c3-(*pi).c2.c3; \
+carry.c3=(d<0); \
+d+=BASE; \
+(*pi).c2.c3=d&MASK; \
+d=(*pj).c2.c4-(*pi).c2.c4; \
+carry.c4=(d<0); \
+d+=BASE; \
+(*pi).c2.c4=d&MASK
+
+void RandGen::RanLxd::error(int no) const
+{
+    switch(no)
+    {
+        case 0:
+            LATAN_ERROR(System, "Arithmetic on this machine is not suitable for ranlxd");
+            break;
+        case 1:
+            LATAN_ERROR(Range, "Bad choice of luxury level (should be 1 or 2)");
+            break;
+        case 2:
+            LATAN_ERROR(Range, "Bad choice of seed (should be between 1 and 2^31-1)");
+            break;
+        case 3:
+            LATAN_ERROR(Runtime, "Undefined state (ranlxd is not initialized)");
+        case 4:
+            LATAN_ERROR(System, "Arithmetic on this machine is not suitable for ranlxd");
+            break;
+        case 5:
+            LATAN_ERROR(Logic, "Unexpected input data");
+            break;
+    }
+}
+
+void RandGen::RanLxd::update(void)
+{
+    int k,kmax,d;
+    rlxd_dble_vec_t *pmin,*pmax,*pi,*pj;
+    
+    kmax=rlxd_pr;
+    pmin=&rlxd_x.vec[0];
+    pmax=pmin+12;
+    pi=&rlxd_x.vec[ir];
+    pj=&rlxd_x.vec[jr];
+    
+    for (k=0;k<kmax;k++)
+    {
+        STEP(pi,pj);
+        pi+=1;
+        pj+=1;
+        if (pi==pmax)
+            pi=pmin;
+        if (pj==pmax)
+            pj=pmin;
+    }
+    
+    ir+=prm;
+    jr+=prm;
+    if (ir>=12)
+        ir-=12;
+    if (jr>=12)
+        jr-=12;
+    is=8*ir;
+    is_old=is;
+}
+
+void RandGen::RanLxd::define_constants(void)
+{
+    int k;
+    
+    one_bit=ldexp(1.0,-24);
+    
+    for (k=0;k<96;k++)
+    {
+        next[k]=(k+1)%96;
+        if ((k%4)==3)
+            next[k]=(k+5)%96;
+    }
+}
+
+void RandGen::RanLxd::rlxd_init(int level,int seed)
+{
+    int i,k,l;
+    int ibit,jbit,xbit[31];
+    int ix,iy;
+    
+    if ((INT_MAX<2147483647)||(FLT_RADIX!=2)||(FLT_MANT_DIG<24)||
+        (DBL_MANT_DIG<48))
+        error(0);
+    
+    define_constants();
+    
+    if (level==1)
+        rlxd_pr=202;
+    else if (level==2)
+        rlxd_pr=397;
+    else
+        error(1);
+    
+    i=seed;
+    
+    for (k=0;k<31;k++)
+    {
+        xbit[k]=i%2;
+        i/=2;
+    }
+    
+    if ((seed<=0)||(i!=0))
+        error(2);
+    
+    ibit=0;
+    jbit=18;
+    
+    for (i=0;i<4;i++)
+    {
+        for (k=0;k<24;k++)
+        {
+            ix=0;
+            
+            for (l=0;l<24;l++)
+            {
+                iy=xbit[ibit];
+                ix=2*ix+iy;
+                
+                xbit[ibit]=(xbit[ibit]+xbit[jbit])%2;
+                ibit=(ibit+1)%31;
+                jbit=(jbit+1)%31;
+            }
+            
+            if ((k%4)!=i)
+                ix=16777215-ix;
+            
+            rlxd_x.num[4*k+i]=ix;
+        }
+    }
+    
+    carry.c1=0;
+    carry.c2=0;
+    carry.c3=0;
+    carry.c4=0;
+    
+    ir=0;
+    jr=7;
+    is=91;
+    is_old=0;
+    prm=rlxd_pr%12;
+    init=1;
+}
+
+void RandGen::RanLxd::ranlxd(double r[],int n)
+{
+    int k;
+    
+    if (init==0)
+        rlxd_init(1,1);
+    
+    for (k=0;k<n;k++)
+    {
+        is=next[is];
+        if (is==is_old)
+            update();
+        r[k]=one_bit*((double)(rlxd_x.num[is+4])+one_bit*(double)(rlxd_x.num[is]));
+    }
+}
+
+int RandGen::RanLxd::rlxd_size(void) const
+{
+    return(RLXG_STATE_SIZE);
+}
+
+void RandGen::RanLxd::rlxd_get(int state[]) const
+{
+    int k;
+    
+    if (init==0)
+        error(3);
+    
+    state[0]=rlxd_size();
+    
+    for (k=0;k<96;k++)
+        state[k+1]=rlxd_x.num[k];
+    
+    state[97]=carry.c1;
+    state[98]=carry.c2;
+    state[99]=carry.c3;
+    state[100]=carry.c4;
+    
+    state[101]=rlxd_pr;
+    state[102]=ir;
+    state[103]=jr;
+    state[104]=is;
+}
+
+void RandGen::RanLxd::rlxd_reset(const int state[])
+{
+    int k;
+    
+    if ((INT_MAX<2147483647)||(FLT_RADIX!=2)||(FLT_MANT_DIG<24)||
+        (DBL_MANT_DIG<48))
+        error(4);
+    
+    define_constants();
+    
+    if (state[0]!=rlxd_size())
+        error(5);
+    
+    for (k=0;k<96;k++)
+    {
+        if ((state[k+1]<0)||(state[k+1]>=167777216))
+            error(5);
+        
+        rlxd_x.num[k]=state[k+1];
+    }
+    
+    if (((state[97]!=0)&&(state[97]!=1))||
+        ((state[98]!=0)&&(state[98]!=1))||
+        ((state[99]!=0)&&(state[99]!=1))||
+        ((state[100]!=0)&&(state[100]!=1)))
+        error(5);
+    
+    carry.c1=state[97];
+    carry.c2=state[98];
+    carry.c3=state[99];
+    carry.c4=state[100];
+    
+    rlxd_pr=state[101];
+    ir=state[102];
+    jr=state[103];
+    is=state[104];
+    is_old=8*ir;
+    prm=rlxd_pr%12;
+    init=1;
+    
+    if (((rlxd_pr!=202)&&(rlxd_pr!=397))||
+        (ir<0)||(ir>11)||(jr<0)||(jr>11)||(jr!=((ir+7)%12))||
+        (is<0)||(is>91))
+        error(5);
+}
+
+#endif
+
+// constructors ////////////////////////////////////////////////////////////////
+RandGen::RandGen(void)
+{
+    generator_.rlxd_init(RLXD_LEVEL, (int)time(NULL));
+}
+
+RandGen::RandGen(const int seed)
+{
+    generator_.rlxd_init(RLXD_LEVEL, seed);
+}
+
+RandGen::RandGen(const State &state)
+{
+    setState(state);
+}
+
+// destructor //////////////////////////////////////////////////////////////////
+RandGen::~RandGen(void)
+{}
+
+// state management ////////////////////////////////////////////////////////////
+RandGen::State RandGen::getState(void) const
+{
+    State state;
+    
+    generator_.rlxd_get(state.data());
+    
+    return state;
+}
+
+void RandGen::setState(const State &state)
+{
+    generator_.rlxd_reset(state.data());
+}
+
+// generators //////////////////////////////////////////////////////////////////
+double RandGen::uniform(const double a, const double b)
+{
+    double rx;
+    
+    generator_.ranlxd(&rx, 1);
+    
+    return (b-a)*rx + a;
+}
+
+double RandGen::discreteUniform(const unsigned int n)
+{
+    return ((unsigned int)(uniform()*(double)(n)));
+}
+
+double RandGen::gaussian(const double mean, const double sigma)
+{
+    double rx, ry, sqNrm;
+    
+    do
+    {
+        rx = uniform(-1.0, 1.0);
+        ry = uniform(-1.0, 1.0);
+        sqNrm = rx*rx + ry*ry;
+    } while ((sqNrm > 1.0)||(sqNrm == 0.0));
+    
+    return sigma*rx*sqrt(-2.0*log(sqNrm)/sqNrm) + mean;
+}

latan/RandGen.hpp

@@ -0,0 +1,101 @@
+/*
+ * RandGen.hpp, part of LatAnalyze 3
+ *
+ * Copyright (C) 2013 - 2014 Antonin Portelli
+ *
+ * LatAnalyze 3 is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * LatAnalyze 3 is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with LatAnalyze 3.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef Latan_RandGen_hpp_
+#define Latan_RandGen_hpp_
+
+#include <latan/Global.hpp>
+#include <latan/IoObject.hpp>
+
+#define RLXG_STATE_SIZE 105
+
+BEGIN_NAMESPACE
+
+/******************************************************************************
+ *                          Random generator class                            *
+ ******************************************************************************/
+
+class RandGen
+{
+public:
+    class State: public Eigen::Array<int, RLXG_STATE_SIZE, 1>, public IoObject
+    {
+    public:
+        // constructor
+        State(void);
+        // destructor
+        ~State(void);
+        // IO type
+        unsigned int getType(void) const;
+    };
+private:
+    // Martin Luescher's ranlxd generator interface
+    class RanLxd
+    {
+    private:
+        typedef struct
+        {
+            float c1,c2,c3,c4;
+        } rlxd_vec_t __attribute__ ((aligned (16)));
+        typedef struct
+        {
+            rlxd_vec_t c1,c2;
+        } rlxd_dble_vec_t __attribute__ ((aligned (16)));
+    public:
+        RanLxd(void);
+        void ranlxd(double r[],int n);
+        void rlxd_init(int level,int seed);
+        int  rlxd_size(void) const;
+        void rlxd_get(int state[]) const;
+        void rlxd_reset(const int state[]);
+    private:
+        void error(int no) const;
+        void update(void);
+        void define_constants(void);
+    private:
+        int        init, rlxd_pr, prm, ir, jr, is, is_old, next[96];
+        rlxd_vec_t one_sse, one_bit_sse, carry;
+        double     one_bit;
+        union
+        {
+            rlxd_dble_vec_t vec[12];
+            float num[96];
+        } rlxd_x __attribute__ ((aligned (16)));
+    };
+public:
+    // constructors
+    RandGen(void);
+    RandGen(const int seed);
+    RandGen(const State &state);
+    // destructor
+    virtual ~RandGen(void);
+    // state management
+    State getState(void) const;
+    void  setState(const State &state);
+    // generators
+    double uniform(const double a = 0.0, const double b = 1.0);
+    double discreteUniform(const unsigned int n);
+    double gaussian(const double mean = 0.0, const double sigma = 1.0);
+private:
+    RanLxd generator_;
+};
+
+END_NAMESPACE
+
+#endif // Latan_RandGen_hpp_

latan/includes.hpp

@@ -24,6 +24,8 @@
 #include <iostream>
 #include <iomanip>
 #include <sstream>
+#include <cfloat>
+#include <climits>
 #include <cmath>
 #include <cstdarg>
 #include <cstdio>