From 4812c90424dfc40d26725244723887a2d16ddfd9 Mon Sep 17 00:00:00 2001 From: Alan Mishchenko Date: Mon, 1 Oct 2007 08:01:00 -0700 Subject: Version abc71001 --- src/bdd/cudd/cuddAddFind.c | 283 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 283 insertions(+) create mode 100644 src/bdd/cudd/cuddAddFind.c (limited to 'src/bdd/cudd/cuddAddFind.c') diff --git a/src/bdd/cudd/cuddAddFind.c b/src/bdd/cudd/cuddAddFind.c new file mode 100644 index 00000000..0469b014 --- /dev/null +++ b/src/bdd/cudd/cuddAddFind.c @@ -0,0 +1,283 @@ +/**CFile*********************************************************************** + + FileName [cuddAddFind.c] + + PackageName [cudd] + + Synopsis [Functions to find maximum and minimum in an ADD and to + extract the i-th bit.] + + Description [External procedures included in this module: + + Static functions included in this module: + ] + + Author [Fabio Somenzi] + + Copyright [This file was created at the University of Colorado at + Boulder. The University of Colorado at Boulder makes no warranty + about the suitability of this software for any purpose. It is + presented on an AS IS basis.] + +******************************************************************************/ + +#include "util_hack.h" +#include "cuddInt.h" + +/*---------------------------------------------------------------------------*/ +/* Constant declarations */ +/*---------------------------------------------------------------------------*/ + + +/*---------------------------------------------------------------------------*/ +/* Stucture declarations */ +/*---------------------------------------------------------------------------*/ + + +/*---------------------------------------------------------------------------*/ +/* Type declarations */ +/*---------------------------------------------------------------------------*/ + + +/*---------------------------------------------------------------------------*/ +/* Variable declarations */ +/*---------------------------------------------------------------------------*/ + +#ifndef lint +static char rcsid[] DD_UNUSED = "$Id: cuddAddFind.c,v 1.1.1.1 2003/02/24 22:23:50 wjiang Exp $"; +#endif + + +/*---------------------------------------------------------------------------*/ +/* Macro declarations */ +/*---------------------------------------------------------------------------*/ + + +/**AutomaticStart*************************************************************/ + +/*---------------------------------------------------------------------------*/ +/* Static function prototypes */ +/*---------------------------------------------------------------------------*/ + +static DdNode * addDoIthBit ARGS((DdManager *dd, DdNode *f, DdNode *index)); + +/**AutomaticEnd***************************************************************/ + + +/*---------------------------------------------------------------------------*/ +/* Definition of exported functions */ +/*---------------------------------------------------------------------------*/ + +/**Function******************************************************************** + + Synopsis [Finds the maximum discriminant of f.] + + Description [Returns a pointer to a constant ADD.] + + SideEffects [None] + +******************************************************************************/ +DdNode * +Cudd_addFindMax( + DdManager * dd, + DdNode * f) +{ + DdNode *t, *e, *res; + + statLine(dd); + if (cuddIsConstant(f)) { + return(f); + } + + res = cuddCacheLookup1(dd,Cudd_addFindMax,f); + if (res != NULL) { + return(res); + } + + t = Cudd_addFindMax(dd,cuddT(f)); + if (t == DD_PLUS_INFINITY(dd)) return(t); + + e = Cudd_addFindMax(dd,cuddE(f)); + + res = (cuddV(t) >= cuddV(e)) ? t : e; + + cuddCacheInsert1(dd,Cudd_addFindMax,f,res); + + return(res); + +} /* end of Cudd_addFindMax */ + + +/**Function******************************************************************** + + Synopsis [Finds the minimum discriminant of f.] + + Description [Returns a pointer to a constant ADD.] + + SideEffects [None] + +******************************************************************************/ +DdNode * +Cudd_addFindMin( + DdManager * dd, + DdNode * f) +{ + DdNode *t, *e, *res; + + statLine(dd); + if (cuddIsConstant(f)) { + return(f); + } + + res = cuddCacheLookup1(dd,Cudd_addFindMin,f); + if (res != NULL) { + return(res); + } + + t = Cudd_addFindMin(dd,cuddT(f)); + if (t == DD_MINUS_INFINITY(dd)) return(t); + + e = Cudd_addFindMin(dd,cuddE(f)); + + res = (cuddV(t) <= cuddV(e)) ? t : e; + + cuddCacheInsert1(dd,Cudd_addFindMin,f,res); + + return(res); + +} /* end of Cudd_addFindMin */ + + +/**Function******************************************************************** + + Synopsis [Extracts the i-th bit from an ADD.] + + Description [Produces an ADD from another ADD by replacing all + discriminants whose i-th bit is equal to 1 with 1, and all other + discriminants with 0. The i-th bit refers to the integer + representation of the leaf value. If the value is has a fractional + part, it is ignored. Repeated calls to this procedure allow one to + transform an integer-valued ADD into an array of ADDs, one for each + bit of the leaf values. Returns a pointer to the resulting ADD if + successful; NULL otherwise.] + + SideEffects [None] + + SeeAlso [Cudd_addBddIthBit] + +******************************************************************************/ +DdNode * +Cudd_addIthBit( + DdManager * dd, + DdNode * f, + int bit) +{ + DdNode *res; + DdNode *index; + + /* Use a constant node to remember the bit, so that we can use the + ** global cache. + */ + index = cuddUniqueConst(dd,(CUDD_VALUE_TYPE) bit); + if (index == NULL) return(NULL); + cuddRef(index); + + do { + dd->reordered = 0; + res = addDoIthBit(dd, f, index); + } while (dd->reordered == 1); + + if (res == NULL) { + Cudd_RecursiveDeref(dd, index); + return(NULL); + } + cuddRef(res); + Cudd_RecursiveDeref(dd, index); + cuddDeref(res); + return(res); + +} /* end of Cudd_addIthBit */ + + +/*---------------------------------------------------------------------------*/ +/* Definition of internal functions */ +/*---------------------------------------------------------------------------*/ + + +/*---------------------------------------------------------------------------*/ +/* Definition of static functions */ +/*---------------------------------------------------------------------------*/ + + +/**Function******************************************************************** + + Synopsis [Performs the recursive step for Cudd_addIthBit.] + + Description [Performs the recursive step for Cudd_addIthBit. + Returns a pointer to the BDD if successful; NULL otherwise.] + + SideEffects [None] + + SeeAlso [] + +******************************************************************************/ +static DdNode * +addDoIthBit( + DdManager * dd, + DdNode * f, + DdNode * index) +{ + DdNode *res, *T, *E; + DdNode *fv, *fvn; + int mask, value; + int v; + + statLine(dd); + /* Check terminal case. */ + if (cuddIsConstant(f)) { + mask = 1 << ((int) cuddV(index)); + value = (int) cuddV(f); + return((value & mask) == 0 ? DD_ZERO(dd) : DD_ONE(dd)); + } + + /* Check cache. */ + res = cuddCacheLookup2(dd,addDoIthBit,f,index); + if (res != NULL) return(res); + + /* Recursive step. */ + v = f->index; + fv = cuddT(f); fvn = cuddE(f); + + T = addDoIthBit(dd,fv,index); + if (T == NULL) return(NULL); + cuddRef(T); + + E = addDoIthBit(dd,fvn,index); + if (E == NULL) { + Cudd_RecursiveDeref(dd, T); + return(NULL); + } + cuddRef(E); + + res = (T == E) ? T : cuddUniqueInter(dd,v,T,E); + if (res == NULL) { + Cudd_RecursiveDeref(dd, T); + Cudd_RecursiveDeref(dd, E); + return(NULL); + } + cuddDeref(T); + cuddDeref(E); + + /* Store result. */ + cuddCacheInsert2(dd,addDoIthBit,f,index,res); + + return(res); + +} /* end of addDoIthBit */ + -- cgit v1.2.3