
/**************************************************************************\

MODULE: mat_zz_p

SUMMARY:

Defines the class mat_zz_p.
Note that the modulus p need not be a prime, except as indicated below.

IMPLEMENTATION NOTES: 

Starting with NTL version 9.7.0 (and 9.7.1), many of the routines here have
been optimized to take better advantage of specific hardware features available
on 64-bit Intel CPU's.  Currently, the mul, inv, determinant, solve, gauss,
kernel, and image routines are fastest for p up to 23-bits long (assuming the
CPU supports AVX instructions).  After that, performance degrades in three
stages: stage 1: up to 28-bits; stage 2: up to 31-bits; stage 3: 32-bits and
up. 

For primes up to 23-bits, AVX floating point instructions are used.  After
that, ordinary integer arithmetic is used.  In a future version, I may exploit
AVX2 integer instructions to get better stage 2 performance.  And in the more
distant future, AVX512 instructions will be used, when they become available.

On older Intel machines, or non-Intel machines that have "long long" support,
one still gets optimizations corresponding to the three stages above.  On
32-bit machines, one still gets three stages, just with smaller crossover
points.

\**************************************************************************/


#include <NTL/matrix.h>
#include "vec_vec_zz_p.h"


typedef Mat<zz_p> mat_zz_p; // backward compatibility

void add(mat_zz_p& X, const mat_zz_p& A, const mat_zz_p& B); 
// X = A + B

void sub(mat_zz_p& X, const mat_zz_p& A, const mat_zz_p& B); 
// X = A - B

void mul(mat_zz_p& X, const mat_zz_p& A, const mat_zz_p& B); 
// X = A * B

void mul(vec_zz_p& x, const mat_zz_p& A, const vec_zz_p& b); 
// x = A * b

void mul(vec_zz_p& x, const vec_zz_p& a, const mat_zz_p& B); 
// x = a * B

void mul(mat_zz_p& X, const mat_zz_p& A, zz_p b);
void mul(mat_zz_p& X, const mat_zz_p& A, long b);
// X = A * b

void mul(mat_zz_p& X, zz_p a, const mat_zz_p& B);
void mul(mat_zz_p& X, long a, const mat_zz_p& B);
// X = a * B


void transpose(mat_zz_p& X, const mat_zz_p& A);
mat_zz_p transpose(const mat_zz_p& A);
// X = transpose of A


void determinant(zz_p& d, const mat_zz_p& A);
zz_p determinant(const mat_zz_p& a); 
// d = determinant(A)

void solve(zz_p& d, vec_zz_p& x, const mat_zz_p& A, const vec_zz_p& b);
// A is an n x n matrix, b is a length n vector.  Computes d = determinant(A).
// If d != 0, solves x*A = b (so x and b are treated as a row vectors).

void solve(zz_p& d, const mat_zz_p& A, vec_zz_p& x, const vec_zz_p& b);
// A is an n x n matrix, b is a length n vector.  Computes d = determinant(A).
// If d != 0, solves A*x = b (so x and b are treated as a column vectors).

void inv(zz_p& d, mat_zz_p& X, const mat_zz_p& A);
// A is an n x n matrix.  Computes d = determinant(A).  If d != 0,
// computes X = A^{-1}.


void inv(mat_zz_p& X, const mat_zz_p& A);
mat_zz_p inv(const mat_zz_p& A);
// X = A^{-1}; error is raised if A is  singular

void power(mat_zz_p& X, const mat_zz_p& A, const ZZ& e);
mat_zz_p power(const mat_zz_p& A, const ZZ& e);
void power(mat_zz_p& X, const mat_zz_p& A, long e);
mat_zz_p power(const mat_zz_p& A, long e);
// X = A^e; e may be negative (in which case A must be nonsingular).

// NOTE: the routines determinant, solve, inv, and power (with negative
// exponent) all require that the modulus p is prime: during elimination, if a
// non-zero pivot element does not have an inverse, and error is raised.  The
// following "relaxed" versions of these routines will also work with prime
// powers, if the optional parameter relax is true (which is the default).
// However, note that in these relaxed routines, if a computed determinant
// value is zero, this may not be the true determinant: all that you can assume
// is that the true determinant is is not invertible mod p. If the parameter
// relax==false, then these routines behave identically to their "unrelaxed"
// counterparts.

void relaxed_determinant(zz_p& d, const mat_zz_p& A, bool relax=true);
zz_p relaxed_determinant(const mat_zz_p& a, bool relax=true); 
void relaxed_solve(zz_p& d, vec_zz_p& x, const mat_zz_p& A, const vec_zz_p& b, bool relax=true);
void relaxed_solve(zz_p& d, const mat_zz_p& A, vec_zz_p& x, const vec_zz_p& b, bool relax=true);
void relaxed_inv(zz_p& d, mat_zz_p& X, const mat_zz_p& A, bool relax=true);
void relaxed_inv(mat_zz_p& X, const mat_zz_p& A, bool relax=true);
mat_zz_p relaxed_inv(const mat_zz_p& A, bool relax=true);
void relaxed_power(mat_zz_p& X, const mat_zz_p& A, const ZZ& e, bool relax=true);
mat_zz_p relaxed_power(const mat_zz_p& A, const ZZ& e, bool relax=true);
void relaxed_power(mat_zz_p& X, const mat_zz_p& A, long e, bool relax=true);
mat_zz_p relaxed_power(const mat_zz_p& A, long e, bool relax=true);


void sqr(mat_zz_p& X, const mat_zz_p& A);
mat_zz_p sqr(const mat_zz_p& A);
// X = A*A   

void ident(mat_zz_p& X, long n);
mat_zz_p ident_mat_zz_p(long n);
// X = n x n identity matrix

long IsIdent(const mat_zz_p& A, long n);
// test if A is the n x n identity matrix

void diag(mat_zz_p& X, long n, zz_p d);
mat_zz_p diag(long n, zz_p d);
// X = n x n diagonal matrix with d on diagonal

long IsDiag(const mat_zz_p& A, long n, zz_p d);
// test if X is an  n x n diagonal matrix with d on diagonal



long gauss(mat_zz_p& M);
long gauss(mat_zz_p& M, long w);
// Performs unitary row operations so as to bring M into row echelon
// form.  If the optional argument w is supplied, stops when first w
// columns are in echelon form.  The return value is the rank (or the
// rank of the first w columns).

void image(mat_zz_p& X, const mat_zz_p& A);
// The rows of X are computed as basis of A's row space.  X is is row
// echelon form

void kernel(mat_zz_p& X, const mat_zz_p& A);
// Computes a basis for the kernel of the map x -> x*A. where x is a
// row vector.

// NOTE: the gauss, image, and kernel routines all require that
// the modulus p is prime. 



// miscellaneous:

void clear(mat_zz_p& a);
// x = 0 (dimension unchanged)

long IsZero(const mat_zz_p& a);
// test if a is the zero matrix (any dimension)


// operator notation:

mat_zz_p operator+(const mat_zz_p& a, const mat_zz_p& b);
mat_zz_p operator-(const mat_zz_p& a, const mat_zz_p& b);
mat_zz_p operator*(const mat_zz_p& a, const mat_zz_p& b);

mat_zz_p operator-(const mat_zz_p& a);


// matrix/scalar multiplication:

mat_zz_p operator*(const mat_zz_p& a, zz_p b);
mat_zz_p operator*(const mat_zz_p& a, long b);

mat_zz_p operator*(zz_p a, const mat_zz_p& b);
mat_zz_p operator*(long a, const mat_zz_p& b);


// matrix/vector multiplication:

vec_zz_p operator*(const mat_zz_p& a, const vec_zz_p& b);

vec_zz_p operator*(const vec_zz_p& a, const mat_zz_p& b);


// assignment operator notation:

mat_zz_p& operator+=(mat_zz_p& x, const mat_zz_p& a);
mat_zz_p& operator-=(mat_zz_p& x, const mat_zz_p& a);
mat_zz_p& operator*=(mat_zz_p& x, const mat_zz_p& a);

mat_zz_p& operator*=(mat_zz_p& x, zz_p a);
mat_zz_p& operator*=(mat_zz_p& x, long a);

vec_zz_p& operator*=(vec_zz_p& x, const mat_zz_p& a);


