source: git/factory/int_pp.cc @ 22743e

/* emacs edit mode for this file is -*- C++ -*- */
/* $Id: int_pp.cc,v 1.6 1997-10-10 10:57:48 schmidt Exp $ */

#include <config.h>

#include "assert.h"

#include "cf_defs.h"
#include "int_pp.h"
#include "canonicalform.h"
#include "cf_factory.h"

MP_INT InternalPrimePower::primepow;
MP_INT InternalPrimePower::primepowhalf;
int InternalPrimePower::prime;
int InternalPrimePower::exp;
int InternalPrimePower::initialized = InternalPrimePower::initialize();


InternalPrimePower::InternalPrimePower()
{
    mpz_init( &thempi );
}

InternalPrimePower::InternalPrimePower( const int i )
{
    mpz_init_set_si( &thempi, i );
    if ( mpz_cmp_si( &thempi, 0 ) < 0 ) {
        mpz_neg( &thempi, &thempi );
        mpz_mod( &thempi, &thempi, &primepow );
        mpz_sub( &thempi, &primepow, &thempi );
    }
    else
        mpz_mod( &thempi, &thempi, &primepow );
}

InternalPrimePower::InternalPrimePower( const MP_INT & mpi ) : thempi( mpi ) {}

InternalPrimePower::InternalPrimePower( const char * str )
{
    mpz_init_set_str( &thempi, str, 10 );
    if ( mpz_cmp_si( &thempi, 0 ) < 0 ) {
        mpz_neg( &thempi, &thempi );
        mpz_mod( &thempi, &thempi, &primepow );
        mpz_sub( &thempi, &primepow, &thempi );
    }
    else
        mpz_mod( &thempi, &thempi, &primepow );
}

InternalPrimePower::~InternalPrimePower()
{
    mpz_clear( &thempi );
}

InternalCF* InternalPrimePower::deepCopyObject() const
{
    MP_INT dummy;
    mpz_init_set( &dummy, &thempi );
    return new InternalPrimePower( dummy );
}

InternalCF * InternalPrimePower::normalize_myself()
{
    ASSERT( getRefCount() == 1, "illegal operation" );
    if ( mpz_cmp_si( &thempi, 0 ) < 0 ) {
        mpz_neg( &thempi, &thempi );
        mpz_mod( &thempi, &thempi, &primepow );
        mpz_sub( &thempi, &primepow, &thempi );
    }
    else
        mpz_mod( &thempi, &thempi, &primepow );
    return this;
}

int InternalPrimePower::initialize()
{
    mpz_init_set_si( &primepow, 3 );
    mpz_init_set_si( &primepowhalf, 1 );
    prime = 3;
    exp = 1;
    return 1;
}

void
InternalPrimePower::setPrimePower( int p, int k )
{
    ASSERT( p > 1 && k > 0, "illegal prime power" );
    if ( p != prime || k != exp ) {
        mpz_set_si( &primepow, p );
        mpz_pow_ui( &primepow, &primepow, (unsigned int)k );
        mpz_div_ui( &primepowhalf, &primepow, 2 );
        prime = p;
        exp = k;
    }
}

int
InternalPrimePower::getp()
{
    return prime;
}

int
InternalPrimePower::getk()
{
    return exp;
}

#ifndef NOSTREAMIO
void InternalPrimePower::print( ostream & os, char * c )
{
    if ( *c == '*' && mpz_cmp_si( &thempi, 1 ) == 0 )
        os << c+1;
    else if ( *c == '*' && mpz_cmp_si( &thempi, -1 ) == 0 )
        os << '-' << c+1;
    else {
        char * str = new char[mpz_sizeinbase( &thempi, 10 ) + 2];
        str = mpz_get_str( str, 10, &thempi );
        os << str << c;
        delete [] str;
    }
}
#endif /* NOSTREAMIO */

bool InternalPrimePower::isZero() const
{
    return mpz_cmp_si( &thempi, 0 ) == 0;
}

bool InternalPrimePower::isOne() const
{
    return mpz_cmp_si( &thempi, 1 ) == 0;
}

bool InternalPrimePower::is_imm() const
{
    return false;
}

InternalCF* InternalPrimePower::genZero()
{
    if ( isZero() )
        return copyObject();
    else
        return new InternalPrimePower();
}

InternalCF* InternalPrimePower::genOne()
{
    if ( isOne() )
        return copyObject();
    else
        return new InternalPrimePower();
}

InternalCF* InternalPrimePower::neg()
{
    if ( getRefCount() > 1 ) {
        decRefCount();
        MP_INT dummy;
        mpz_init( &dummy );
        mpz_sub( &dummy, &primepow, &thempi );
        return new InternalPrimePower( dummy );
    }
    else {
        mpz_sub( &thempi, &primepow, &thempi );
        return this;
    }
}


int InternalPrimePower::comparesame( InternalCF * c )
{
    return mpz_cmp( &thempi, &MPI( c ) );
}

InternalCF* InternalPrimePower::addsame( InternalCF * c )
{
    if ( getRefCount() > 1 ) {
        decRefCount();
        MP_INT dummy;
        mpz_init( &dummy );
        mpz_add( &dummy, &thempi, &MPI( c ) );
        if ( mpz_cmp( &dummy, &primepow ) >= 0 )
            mpz_sub( &dummy, &dummy, &primepow );
        return new InternalPrimePower( dummy );
    }
    else {
        mpz_add( &thempi, &thempi, &MPI( c ) );
        if ( mpz_cmp( &thempi, &primepow ) >= 0 )
            mpz_sub( &thempi, &thempi, &primepow );
        return this;
    }
}

InternalCF* InternalPrimePower::subsame( InternalCF * c )
{
    if ( getRefCount() > 1 ) {
        decRefCount();
        MP_INT dummy;
        mpz_init( &dummy );
        mpz_sub( &dummy, &thempi, &MPI( c ) );
        if ( mpz_cmp_si( &dummy, 0 ) < 0 )
            mpz_add( &dummy, &dummy, &primepow );
        return new InternalPrimePower( dummy );
    }
    else {
        mpz_sub( &thempi, &thempi, &MPI( c ) );
        if ( mpz_cmp_si( &thempi, 0 ) < 0 )
            mpz_add( &thempi, &thempi, &primepow );
        return this;
    }
}

InternalCF* InternalPrimePower::mulsame( InternalCF * c )
{
    if ( getRefCount() > 1 ) {
        decRefCount();
        MP_INT dummy;
        mpz_init( &dummy );
        mpz_mul( &dummy, &thempi, &MPI( c ) );
        mpz_mod( &dummy, &dummy, &primepow );
        return new InternalPrimePower( dummy );
    }
    else {
        mpz_mul( &thempi, &thempi, &MPI( c ) );
        mpz_mod( &thempi, &thempi, &primepow );
        return this;
    }
}

InternalCF* InternalPrimePower::dividesame( InternalCF * c )
{
    return divsame( c );
}

InternalCF* InternalPrimePower::divsame( InternalCF * c )
{
    if ( c == this ) {
        if ( deleteObject() ) delete this;
        return CFFactory::basic( 1 );
    }
    if ( getRefCount() > 1 ) {
        decRefCount();
        MP_INT dummy, a, b;
        mpz_init( &dummy ); mpz_init( &a ); mpz_init( &b );
        mpz_gcdext( &dummy, &a, &b, &primepow, &MPI( c ) );
        ASSERT( mpz_cmp_si( &dummy, 1 ) == 0, "illegal inversion" );
        mpz_clear( &dummy ); mpz_clear( &a );
        if ( mpz_cmp_si( &b, 0 ) < 0 )
            mpz_add( &b, &b, &primepow );
        mpz_mul( &b, &b, &thempi );
        mpz_mod( &b, &b, &primepow );
        return new InternalPrimePower( b );
    }
    else {
        MP_INT dummy, a, b;
        mpz_init( &dummy ); mpz_init( &a ); mpz_init( &b );
        mpz_gcdext( &dummy, &a, &b, &primepow, &MPI( c ) );
        ASSERT( mpz_cmp_si( &dummy, 1 ) == 0, "illegal inversion" );
        if ( mpz_cmp_si( &b, 0 ) < 0 )
            mpz_add( &b, &b, &primepow );
        mpz_mul( &thempi, &b, &thempi );
        mpz_mod( &thempi, &thempi, &primepow );
        mpz_clear( &dummy ); mpz_clear( &a ); mpz_clear( &b );
        return this;
    }
}

InternalCF *
InternalPrimePower::modulosame ( InternalCF * )
{
    if ( deleteObject() ) delete this;
    return CFFactory::basic( 0 );
}

InternalCF *
InternalPrimePower::modsame ( InternalCF * )
{
    if ( deleteObject() ) delete this;
    return CFFactory::basic( 0 );
}

void
InternalPrimePower::divremsame ( InternalCF * c, InternalCF * & quot, InternalCF * & rem )
{
    if ( c == this ) {
        quot = CFFactory::basic( 1 );
        rem = CFFactory::basic( 0 );
    }
    else {
        MP_INT dummy, a, b;
        mpz_init( &dummy ); mpz_init( &a ); mpz_init( &b );
        mpz_gcdext( &dummy, &a, &b, &primepow, &MPI( c ) );
        ASSERT( mpz_cmp_si( &dummy, 1 ) == 0, "illegal inversion" );
        mpz_clear( &dummy ); mpz_clear( &a );
        if ( mpz_cmp_si( &b, 0 ) < 0 )
            mpz_add( &b, &b, &primepow );
        mpz_mul( &b, &b, &thempi );
        mpz_mod( &b, &b, &primepow );
        quot = new InternalPrimePower( b );
        rem = CFFactory::basic( 0 );
    }
}

bool
InternalPrimePower::divremsamet ( InternalCF * c, InternalCF * & quot, InternalCF * & rem )
{
    divremsame( c, quot, rem );
    return true;
}

int
InternalPrimePower::comparecoeff ( InternalCF * )
{
    ASSERT( 0, "this function should never be called" );
    return 0;
}

InternalCF *
InternalPrimePower::addcoeff ( InternalCF * )
{
    ASSERT( 0, "this function should never be called" );
    return this;
}

InternalCF *
InternalPrimePower::subcoeff ( InternalCF *, bool )
{
    ASSERT( 0, "this function should never be called" );
    return this;
}

InternalCF *
InternalPrimePower::mulcoeff ( InternalCF * )
{
    ASSERT( 0, "this function should never be called" );
    return this;
}

InternalCF *
InternalPrimePower::dividecoeff ( InternalCF *, bool )
{
    ASSERT( 0, "this function should never be called" );
    return this;
}

InternalCF *
InternalPrimePower::divcoeff ( InternalCF *, bool )
{
    ASSERT( 0, "this function should never be called" );
    return this;
}

InternalCF *
InternalPrimePower::modcoeff ( InternalCF *, bool )
{
    ASSERT( 0, "this function should never be called" );
    return this;
}

InternalCF *
InternalPrimePower::modulocoeff ( InternalCF *, bool )
{
    ASSERT( 0, "this function should never be called" );
    return this;
}

void
InternalPrimePower::divremcoeff ( InternalCF *, InternalCF * &, InternalCF * &, bool )
{
    ASSERT( 0, "this function should never be called" );
}

bool
InternalPrimePower::divremcoefft ( InternalCF *, InternalCF * &, InternalCF * &, bool )
{
    ASSERT( 0, "this function should never be called" );
    return true;
}

int
InternalPrimePower::intval () const
{
  return (int)mpz_get_si( &thempi );
}

int
InternalPrimePower::intmod( int p ) const
{
  return (int)mpz_mmod_ui( 0, &thempi, (unsigned long)p );
}

//{{{ int InternalPrimePower::sign () const
// docu: see CanonicalForm::sign()
int
InternalPrimePower::sign () const
{
    return mpz_sgn( &thempi );
}
//}}}