/*

 * Copyright 2008-2009 Katholieke Universiteit Leuven

 *

 * Use of this software is governed by the MIT license

 *

 * Written by Sven Verdoolaege, K.U.Leuven, Departement

 * Computerwetenschappen, Celestijnenlaan 200A, B-3001 Leuven, Belgium

 */

#include <isl_ctx_private.h>

#include <isl_seq.h>

void isl_seq_clr(isl_int *p, unsigned len)

{

	int i;

	for (i = 0; i < len; ++i)

		isl_int_set_si(p[i], 0);

}

void isl_seq_set_si(isl_int *p, int v, unsigned len)

{

	int i;

	for (i = 0; i < len; ++i)

		isl_int_set_si(p[i], v);

}

void isl_seq_set(isl_int *p, isl_int v, unsigned len)

{

	int i;

	for (i = 0; i < len; ++i)

		isl_int_set(p[i], v);

}

void isl_seq_neg(isl_int *dst, isl_int *src, unsigned len)

{

	int i;

	for (i = 0; i < len; ++i)

		isl_int_neg(dst[i], src[i]);

}

void isl_seq_cpy(isl_int *dst, isl_int *src, unsigned len)

{

	int i;

	for (i = 0; i < len; ++i)

		isl_int_set(dst[i], src[i]);

}

void isl_seq_submul(isl_int *dst, isl_int f, isl_int *src, unsigned len)

{

	int i;

	for (i = 0; i < len; ++i)

		isl_int_submul(dst[i], f, src[i]);

}

void isl_seq_addmul(isl_int *dst, isl_int f, isl_int *src, unsigned len)

{

	int i;

	for (i = 0; i < len; ++i)

		isl_int_addmul(dst[i], f, src[i]);

}

void isl_seq_swp_or_cpy(isl_int *dst, isl_int *src, unsigned len)

{

	int i;

	for (i = 0; i < len; ++i)

		isl_int_swap_or_set(dst[i], src[i]);

}

void isl_seq_scale(isl_int *dst, isl_int *src, isl_int m, unsigned len)

{

	int i;

	for (i = 0; i < len; ++i)

		isl_int_mul(dst[i], src[i], m);

}

void isl_seq_scale_down(isl_int *dst, isl_int *src, isl_int m, unsigned len)

{

	int i;

	for (i = 0; i < len; ++i)

		isl_int_divexact(dst[i], src[i], m);

}

void isl_seq_cdiv_q(isl_int *dst, isl_int *src, isl_int m, unsigned len)

{

	int i;

	for (i = 0; i < len; ++i)

		isl_int_cdiv_q(dst[i], src[i], m);

}

void isl_seq_fdiv_q(isl_int *dst, isl_int *src, isl_int m, unsigned len)

{

	int i;

	for (i = 0; i < len; ++i)

		isl_int_fdiv_q(dst[i], src[i], m);

}

void isl_seq_fdiv_r(isl_int *dst, isl_int *src, isl_int m, unsigned len)

{

	int i;

	for (i = 0; i < len; ++i)

		isl_int_fdiv_r(dst[i], src[i], m);

}

void isl_seq_combine(isl_int *dst, isl_int m1, isl_int *src1,

			isl_int m2, isl_int *src2, unsigned len)

{

	int i;

	isl_int tmp;

	if (dst == src1 && isl_int_is_one(m1)) {

		if (isl_int_is_zero(m2))

			return;

		for (i = 0; i < len; ++i)

			isl_int_addmul(src1[i], m2, src2[i]);

		return;

	}

	isl_int_init(tmp);

	for (i = 0; i < len; ++i) {

		isl_int_mul(tmp, m1, src1[i]);

		isl_int_addmul(tmp, m2, src2[i]);

		isl_int_set(dst[i], tmp);

	}

	isl_int_clear(tmp);

}

/*

 * Let d = dst[pos] and s = src[pos]

 * dst is replaced by |s| dst - sgn(s)d src

 */

void isl_seq_elim(isl_int *dst, isl_int *src, unsigned pos, unsigned len,

		  isl_int *m)

{

	isl_int a;

	isl_int b;

	if (isl_int_is_zero(dst[pos]))

		return;

	isl_int_init(a);

	isl_int_init(b);

	isl_int_gcd(a, src[pos], dst[pos]);

	isl_int_divexact(b, dst[pos], a);

	if (isl_int_is_pos(src[pos]))

		isl_int_neg(b, b);

	isl_int_divexact(a, src[pos], a);

	isl_int_abs(a, a);

	isl_seq_combine(dst, a, dst, b, src, len);

	if (m)

		isl_int_mul(*m, *m, a);

	isl_int_clear(a);

	isl_int_clear(b);

}

int isl_seq_eq(isl_int *p1, isl_int *p2, unsigned len)

{

	int i;

	for (i = 0; i < len; ++i)

		if (isl_int_ne(p1[i], p2[i]))

			return 0;

	return 1;

}

int isl_seq_cmp(isl_int *p1, isl_int *p2, unsigned len)

{

	int i;

	int cmp;

	for (i = 0; i < len; ++i)

		if ((cmp = isl_int_cmp(p1[i], p2[i])) != 0)

			return cmp;

	return 0;

}

int isl_seq_is_neg(isl_int *p1, isl_int *p2, unsigned len)

{

	int i;

	for (i = 0; i < len; ++i) {

		if (isl_int_abs_ne(p1[i], p2[i]))

			return 0;

		if (isl_int_is_zero(p1[i]))

			continue;

		if (isl_int_eq(p1[i], p2[i]))

			return 0;

	}

	return 1;

}

int isl_seq_first_non_zero(isl_int *p, unsigned len)

{

	int i;

	for (i = 0; i < len; ++i)

		if (!isl_int_is_zero(p[i]))

			return i;

	return -1;

}

int isl_seq_last_non_zero(isl_int *p, unsigned len)

{

	int i;

	for (i = len - 1; i >= 0; --i)

		if (!isl_int_is_zero(p[i]))

			return i;

	return -1;

}

void isl_seq_abs_max(isl_int *p, unsigned len, isl_int *max)

{

	int i;

	isl_int_set_si(*max, 0);

	for (i = 0; i < len; ++i)

		if (isl_int_abs_gt(p[i], *max))

			isl_int_abs(*max, p[i]);

}

int isl_seq_abs_min_non_zero(isl_int *p, unsigned len)

{

	int i, min = isl_seq_first_non_zero(p, len);

	if (min < 0)

		return -1;

	for (i = min + 1; i < len; ++i) {

		if (isl_int_is_zero(p[i]))

			continue;

		if (isl_int_abs_lt(p[i], p[min]))

			min = i;

	}

	return min;

}

void isl_seq_gcd(isl_int *p, unsigned len, isl_int *gcd)

{

	int i, min = isl_seq_abs_min_non_zero(p, len);

	if (min < 0) {

		isl_int_set_si(*gcd, 0);

		return;

	}

	isl_int_abs(*gcd, p[min]);

	for (i = 0; isl_int_cmp_si(*gcd, 1) > 0 && i < len; ++i) {

		if (i == min)

			continue;

		if (isl_int_is_zero(p[i]))

			continue;

		isl_int_gcd(*gcd, *gcd, p[i]);

	}

}

void isl_seq_normalize(struct isl_ctx *ctx, isl_int *p, unsigned len)

{

	if (len == 0)

		return;

	isl_seq_gcd(p, len, &ctx->normalize_gcd);

	if (!isl_int_is_zero(ctx->normalize_gcd) &&

	    !isl_int_is_one(ctx->normalize_gcd))

		isl_seq_scale_down(p, p, ctx->normalize_gcd, len);

}

void isl_seq_lcm(isl_int *p, unsigned len, isl_int *lcm)

{

	int i;

	if (len == 0) {

		isl_int_set_si(*lcm, 1);

		return;

	}

	isl_int_set(*lcm, p[0]);

	for (i = 1; i < len; ++i)

		isl_int_lcm(*lcm, *lcm, p[i]);

}

void isl_seq_inner_product(isl_int *p1, isl_int *p2, unsigned len,

			   isl_int *prod)

{

	int i;

	if (len == 0) {

		isl_int_set_si(*prod, 0);

		return;

	}

	isl_int_mul(*prod, p1[0], p2[0]);

	for (i = 1; i < len; ++i)

		isl_int_addmul(*prod, p1[i], p2[i]);

}

uint32_t isl_seq_hash(isl_int *p, unsigned len, uint32_t hash)

{

	int i;

	for (i = 0; i < len; ++i) {

		if (isl_int_is_zero(p[i]))

			continue;

		hash *= 16777619;

		hash ^= (i & 0xFF);

		hash = isl_int_hash(p[i], hash);

	}

	return hash;

}

uint32_t isl_seq_get_hash(isl_int *p, unsigned len)

{

	uint32_t hash = isl_hash_init();

	return isl_seq_hash(p, len, hash);

}

uint32_t isl_seq_get_hash_bits(isl_int *p, unsigned len, unsigned bits)

{

	uint32_t hash;

	hash = isl_seq_get_hash(p, len);

	return isl_hash_bits(hash, bits);

}

void isl_seq_dump(isl_int *p, unsigned len)

{

	int i;

	for (i = 0; i < len; ++i) {

		if (i)

			fprintf(stderr, " ");

		isl_int_print(stderr, p[i], 0);

	}

	fprintf(stderr, "\n");

}