extract out shared isl_qpolynomial_{take,restore}_local

[isl.git] / isl_point.c

/*
 * Copyright 2010      INRIA Saclay
 * Copyright 2013      Ecole Normale Superieure
 * Copyright 2015      Sven Verdoolaege
 * Copyright 2019,2022 Cerebras Systems
 *
 * Use of this software is governed by the MIT license
 *
 * Written by Sven Verdoolaege, INRIA Saclay - Ile-de-France,
 * Parc Club Orsay Universite, ZAC des vignes, 4 rue Jacques Monod,
 * 91893 Orsay, France
 * and Ecole Normale Superieure, 45 rue d'Ulm, 75230 Paris, France
 * and Cerebras Systems, 175 S San Antonio Rd, Los Altos, CA, USA
 * and Cerebras Systems, 1237 E Arques Ave, Sunnyvale, CA, USA
 */

#include <isl_map_private.h>
#include <isl_point_private.h>
#include <isl/set.h>
#include <isl/union_set.h>
#include <isl_sample.h>
#include <isl_scan.h>
#include <isl_seq.h>
#include <isl_space_private.h>
#include <isl_local_private.h>
#include <isl_val_private.h>
#include <isl_vec_private.h>
#include <isl_output_private.h>

#include <set_to_map.c>

isl_ctx *isl_point_get_ctx(__isl_keep isl_point *pnt)
{
        return pnt ? isl_space_get_ctx(pnt->dim) : NULL;
}

/* Return the space of "pnt".
 */
__isl_keep isl_space *isl_point_peek_space(__isl_keep isl_point *pnt)
{
        return pnt ? pnt->dim : NULL;
}

__isl_give isl_space *isl_point_get_space(__isl_keep isl_point *pnt)
{
        return isl_space_copy(isl_point_peek_space(pnt));
}

#undef TYPE1
#define TYPE1           isl_basic_map
#undef TYPE2
#define TYPE2           isl_point
#undef TYPE_PAIR
#define TYPE_PAIR       isl_basic_map_point

static
#include "isl_type_has_equal_space_templ.c"
static
#include "isl_type_check_equal_space_templ.c"

#undef TYPE
#define TYPE isl_point

#include "isl_check_named_params_templ.c"

__isl_give isl_point *isl_point_alloc(__isl_take isl_space *space,
        __isl_take isl_vec *vec)
{
        struct isl_point *pnt;
        isl_size dim;

        dim = isl_space_dim(space, isl_dim_all);
        if (dim < 0 || !vec)
                goto error;

        if (vec->size > 1 + dim) {
                vec = isl_vec_cow(vec);
                if (!vec)
                        goto error;
                vec->size = 1 + dim;
        }

        pnt = isl_alloc_type(space->ctx, struct isl_point);
        if (!pnt)
                goto error;

        pnt->ref = 1;
        pnt->dim = space;
        pnt->vec = vec;

        return pnt;
error:
        isl_space_free(space);
        isl_vec_free(vec);
        return NULL;
}

__isl_give isl_point *isl_point_zero(__isl_take isl_space *space)
{
        isl_vec *vec;
        isl_size dim;

        dim = isl_space_dim(space, isl_dim_all);
        if (dim < 0)
                goto error;
        vec = isl_vec_alloc(space->ctx, 1 + dim);
        if (!vec)
                goto error;
        isl_int_set_si(vec->el[0], 1);
        isl_seq_clr(vec->el + 1, vec->size - 1);
        return isl_point_alloc(space, vec);
error:
        isl_space_free(space);
        return NULL;
}

__isl_give isl_point *isl_point_dup(__isl_keep isl_point *pnt)
{
        struct isl_point *pnt2;

        if (!pnt)
                return NULL;
        pnt2 = isl_point_alloc(isl_space_copy(pnt->dim), isl_vec_copy(pnt->vec));
        return pnt2;
}

__isl_give isl_point *isl_point_cow(__isl_take isl_point *pnt)
{
        struct isl_point *pnt2;
        if (!pnt)
                return NULL;

        if (pnt->ref == 1)
                return pnt;

        pnt2 = isl_point_dup(pnt);
        isl_point_free(pnt);
        return pnt2;
}

__isl_give isl_point *isl_point_copy(__isl_keep isl_point *pnt)
{
        if (!pnt)
                return NULL;

        pnt->ref++;
        return pnt;
}

__isl_null isl_point *isl_point_free(__isl_take isl_point *pnt)
{
        if (!pnt)
                return NULL;

        if (--pnt->ref > 0)
                return NULL;

        isl_space_free(pnt->dim);
        isl_vec_free(pnt->vec);
        free(pnt);
        return NULL;
}

__isl_give isl_point *isl_point_void(__isl_take isl_space *space)
{
        if (!space)
                return NULL;

        return isl_point_alloc(space, isl_vec_alloc(space->ctx, 0));
}

isl_bool isl_point_is_void(__isl_keep isl_point *pnt)
{
        if (!pnt)
                return isl_bool_error;

        return isl_bool_ok(pnt->vec->size == 0);
}

/* Return the space of "pnt".
 * This may be either a copy or the space itself
 * if there is only one reference to "pnt".
 * This allows the space to be modified inplace
 * if both the point and its space have only a single reference.
 * The caller is not allowed to modify "pnt" between this call and
 * a subsequent call to isl_point_restore_space.
 * The only exception is that isl_point_free can be called instead.
 */
__isl_give isl_space *isl_point_take_space(__isl_keep isl_point *pnt)
{
        isl_space *space;

        if (!pnt)
                return NULL;
        if (pnt->ref != 1)
                return isl_point_get_space(pnt);
        space = pnt->dim;
        pnt->dim = NULL;
        return space;
}

/* Set the space of "pnt" to "space", where the space of "pnt" may be missing
 * due to a preceding call to isl_point_take_space.
 * However, in this case, "pnt" only has a single reference and
 * then the call to isl_point_cow has no effect.
 */
__isl_give isl_point *isl_point_restore_space(__isl_take isl_point *pnt,
        __isl_take isl_space *space)
{
        if (!pnt || !space)
                goto error;

        if (pnt->dim == space) {
                isl_space_free(space);
                return pnt;
        }

        pnt = isl_point_cow(pnt);
        if (!pnt)
                goto error;
        isl_space_free(pnt->dim);
        pnt->dim = space;

        return pnt;
error:
        isl_point_free(pnt);
        isl_space_free(space);
        return NULL;
}

/* Return the coordinate vector of "pnt".
 */
__isl_keep isl_vec *isl_point_peek_vec(__isl_keep isl_point *pnt)
{
        return pnt ? pnt->vec : NULL;
}

/* Return a copy of the coordinate vector of "pnt".
 */
__isl_give isl_vec *isl_point_get_vec(__isl_keep isl_point *pnt)
{
        return isl_vec_copy(isl_point_peek_vec(pnt));
}

/* Return the coordinate vector of "pnt".
 * This may be either a copy or the coordinate vector itself
 * if there is only one reference to "pnt".
 * This allows the coordinate vector to be modified inplace
 * if both the point and its coordinate vector have only a single reference.
 * The caller is not allowed to modify "pnt" between this call and
 * a subsequent call to isl_point_restore_vec.
 * The only exception is that isl_point_free can be called instead.
 */
__isl_give isl_vec *isl_point_take_vec(__isl_keep isl_point *pnt)
{
        isl_vec *vec;

        if (!pnt)
                return NULL;
        if (pnt->ref != 1)
                return isl_point_get_vec(pnt);
        vec = pnt->vec;
        pnt->vec = NULL;
        return vec;
}

/* Set the coordinate vector of "pnt" to "vec",
 * where the coordinate vector of "pnt" may be missing
 * due to a preceding call to isl_point_take_vec.
 * However, in this case, "pnt" only has a single reference and
 * then the call to isl_point_cow has no effect.
 */
__isl_give isl_point *isl_point_restore_vec(__isl_take isl_point *pnt,
        __isl_take isl_vec *vec)
{
        if (!pnt || !vec)
                goto error;

        if (pnt->vec == vec) {
                isl_vec_free(vec);
                return pnt;
        }

        pnt = isl_point_cow(pnt);
        if (!pnt)
                goto error;
        isl_vec_free(pnt->vec);
        pnt->vec = vec;

        return pnt;
error:
        isl_point_free(pnt);
        isl_vec_free(vec);
        return NULL;
}

/* Return the number of variables of the given type.
 */
static isl_size isl_point_dim(__isl_keep isl_point *pnt, enum isl_dim_type type)
{
        return isl_space_dim(isl_point_peek_space(pnt), type);
}

/* Return the position of the coordinates of the given type
 * within the sequence of coordinates of "pnt".
 */
static isl_size isl_point_var_offset(__isl_keep isl_point *pnt,
        enum isl_dim_type type)
{
        return pnt ? isl_space_offset(pnt->dim, type) : isl_size_error;
}

/* Reorder the coordinates of "pnt" based on the given reordering.
 */
static __isl_give isl_point *isl_point_reorder(__isl_take isl_point *pnt,
        __isl_take isl_reordering *r)
{
        isl_vec *vec;

        isl_space_free(isl_point_take_space(pnt));
        pnt = isl_point_restore_space(pnt, isl_reordering_get_space(r));

        vec = isl_point_take_vec(pnt);
        vec = isl_vec_reorder(vec, 1, isl_reordering_copy(r));
        pnt = isl_point_restore_vec(pnt, vec);

        return pnt;
}

/* Align the parameters of "pnt" along those of "model".
 *
 * Note that "model" is not allowed to have any parameters
 * that do not already appear in "pnt" since "pnt" does not specify
 * any value for such parameters.
 */
__isl_give isl_point *isl_point_align_params(__isl_take isl_point *pnt,
        __isl_take isl_space *model)
{
        isl_space *space;
        isl_bool equal_params;

        space = isl_point_peek_space(pnt);
        equal_params = isl_space_has_equal_params(space, model);
        if (equal_params < 0)
                goto error;
        if (!equal_params) {
                isl_reordering *r;

                r = isl_parameter_alignment_reordering(space, model);
                if (!r)
                        goto error;
                if (r->src_len != r->dst_len)
                        isl_die(isl_point_get_ctx(pnt), isl_error_invalid,
                                "no value specified for some parameters",
                                r = isl_reordering_free(r));
                pnt = isl_point_reorder(pnt, r);
        }

        isl_space_free(model);
        return pnt;
error:
        isl_space_free(model);
        isl_point_free(pnt);
        return NULL;
}

#undef TYPE
#define TYPE    isl_point
static
#include "check_type_range_templ.c"

/* Return the value of coordinate "pos" of type "type" of "pnt".
 */
__isl_give isl_val *isl_point_get_coordinate_val(__isl_keep isl_point *pnt,
        enum isl_dim_type type, int pos)
{
        isl_ctx *ctx;
        isl_val *v;
        isl_size off;

        if (!pnt)
                return NULL;

        ctx = isl_point_get_ctx(pnt);
        if (isl_point_is_void(pnt))
                isl_die(ctx, isl_error_invalid,
                        "void point does not have coordinates", return NULL);
        if (isl_point_check_range(pnt, type, pos, 1) < 0)
                return NULL;

        off = isl_point_var_offset(pnt, type);
        if (off < 0)
                return NULL;
        pos += off;

        v = isl_val_rat_from_isl_int(ctx, pnt->vec->el[1 + pos],
                                                pnt->vec->el[0]);
        return isl_val_normalize(v);
}

/* Set all entries of "mv" to NaN.
 */
static __isl_give isl_multi_val *set_nan(__isl_take isl_multi_val *mv)
{
        int i;
        isl_size n;
        isl_val *v;

        n = isl_multi_val_size(mv);
        if (n < 0)
                return isl_multi_val_free(mv);
        v = isl_val_nan(isl_multi_val_get_ctx(mv));
        for (i = 0; i < n; ++i)
                mv = isl_multi_val_set_at(mv, i, isl_val_copy(v));
        isl_val_free(v);

        return mv;
}

/* Return the values of the set dimensions of "pnt".
 * Return a sequence of NaNs in case of a void point.
 */
__isl_give isl_multi_val *isl_point_get_multi_val(__isl_keep isl_point *pnt)
{
        int i;
        isl_bool is_void;
        isl_size n;
        isl_multi_val *mv;

        is_void = isl_point_is_void(pnt);
        if (is_void < 0)
                return NULL;

        mv = isl_multi_val_alloc(isl_point_get_space(pnt));
        if (is_void)
                return set_nan(mv);
        n = isl_multi_val_size(mv);
        if (n < 0)
                return isl_multi_val_free(mv);
        for (i = 0; i < n; ++i) {
                isl_val *v;

                v = isl_point_get_coordinate_val(pnt, isl_dim_set, i);
                mv = isl_multi_val_set_at(mv, i, v);
        }

        return mv;
}

/* Replace coordinate "pos" of type "type" of "pnt" by "v".
 */
__isl_give isl_point *isl_point_set_coordinate_val(__isl_take isl_point *pnt,
        enum isl_dim_type type, int pos, __isl_take isl_val *v)
{
        isl_size off;

        off = isl_space_offset(isl_point_peek_space(pnt), type);
        if (off < 0 || !v)
                goto error;
        if (isl_point_is_void(pnt))
                isl_die(isl_point_get_ctx(pnt), isl_error_invalid,
                        "void point does not have coordinates", goto error);
        if (isl_point_check_range(pnt, type, pos, 1) < 0)
                goto error;
        if (!isl_val_is_rat(v))
                isl_die(isl_point_get_ctx(pnt), isl_error_invalid,
                        "expecting rational value", goto error);

        pos += off;
        if (isl_int_eq(pnt->vec->el[1 + pos], v->n) &&
            isl_int_eq(pnt->vec->el[0], v->d)) {
                isl_val_free(v);
                return pnt;
        }

        pnt = isl_point_cow(pnt);
        if (!pnt)
                goto error;
        pnt->vec = isl_vec_cow(pnt->vec);
        if (!pnt->vec)
                goto error;

        if (isl_int_eq(pnt->vec->el[0], v->d)) {
                isl_int_set(pnt->vec->el[1 + pos], v->n);
        } else if (isl_int_is_one(v->d)) {
                isl_int_mul(pnt->vec->el[1 + pos], pnt->vec->el[0], v->n);
        } else {
                isl_seq_scale(pnt->vec->el + 1,
                                pnt->vec->el + 1, v->d, pnt->vec->size - 1);
                isl_int_mul(pnt->vec->el[1 + pos], pnt->vec->el[0], v->n);
                isl_int_mul(pnt->vec->el[0], pnt->vec->el[0], v->d);
                pnt->vec = isl_vec_normalize(pnt->vec);
                if (!pnt->vec)
                        goto error;
        }

        isl_val_free(v);
        return pnt;
error:
        isl_val_free(v);
        isl_point_free(pnt);
        return NULL;
}

__isl_give isl_point *isl_point_add_ui(__isl_take isl_point *pnt,
        enum isl_dim_type type, int pos, unsigned val)
{
        isl_size off;

        if (!pnt || isl_point_is_void(pnt))
                return pnt;

        pnt = isl_point_cow(pnt);
        if (!pnt)
                return NULL;
        pnt->vec = isl_vec_cow(pnt->vec);
        if (!pnt->vec)
                goto error;

        off = isl_point_var_offset(pnt, type);
        if (off < 0)
                goto error;
        pos += off;

        isl_int_add_ui(pnt->vec->el[1 + pos], pnt->vec->el[1 + pos], val);

        return pnt;
error:
        isl_point_free(pnt);
        return NULL;
}

__isl_give isl_point *isl_point_sub_ui(__isl_take isl_point *pnt,
        enum isl_dim_type type, int pos, unsigned val)
{
        isl_size off;

        if (!pnt || isl_point_is_void(pnt))
                return pnt;

        pnt = isl_point_cow(pnt);
        if (!pnt)
                return NULL;
        pnt->vec = isl_vec_cow(pnt->vec);
        if (!pnt->vec)
                goto error;

        off = isl_point_var_offset(pnt, type);
        if (off < 0)
                goto error;
        pos += off;

        isl_int_sub_ui(pnt->vec->el[1 + pos], pnt->vec->el[1 + pos], val);

        return pnt;
error:
        isl_point_free(pnt);
        return NULL;
}

struct isl_foreach_point {
        struct isl_scan_callback callback;
        isl_stat (*fn)(__isl_take isl_point *pnt, void *user);
        void *user;
        isl_space *dim;
};

static isl_stat foreach_point(struct isl_scan_callback *cb,
        __isl_take isl_vec *sample)
{
        struct isl_foreach_point *fp = (struct isl_foreach_point *)cb;
        isl_point *pnt;

        pnt = isl_point_alloc(isl_space_copy(fp->dim), sample);

        return fp->fn(pnt, fp->user);
}

isl_stat isl_set_foreach_point(__isl_keep isl_set *set,
        isl_stat (*fn)(__isl_take isl_point *pnt, void *user), void *user)
{
        struct isl_foreach_point fp = { { &foreach_point }, fn, user };
        int i;

        if (!set)
                return isl_stat_error;

        fp.dim = isl_set_get_space(set);
        if (!fp.dim)
                return isl_stat_error;

        set = isl_set_copy(set);
        set = isl_set_cow(set);
        set = isl_set_make_disjoint(set);
        set = isl_set_compute_divs(set);
        if (!set)
                goto error;

        for (i = 0; i < set->n; ++i)
                if (isl_basic_set_scan(isl_basic_set_copy(set->p[i]),
                                        &fp.callback) < 0)
                        goto error;

        isl_set_free(set);
        isl_space_free(fp.dim);

        return isl_stat_ok;
error:
        isl_set_free(set);
        isl_space_free(fp.dim);
        return isl_stat_error;
}

/* Return 1 if "bmap" contains the point "point".
 * "bmap" is assumed to have known divs.
 * The point is first extended with the divs and then passed
 * to basic_map_contains.
 */
isl_bool isl_basic_map_contains_point(__isl_keep isl_basic_map *bmap,
        __isl_keep isl_point *point)
{
        isl_local *local;
        isl_vec *vec;
        isl_bool contains;

        if (isl_basic_map_point_check_equal_space(bmap, point) < 0)
                return isl_bool_error;
        if (bmap->n_div == 0)
                return isl_basic_map_contains(bmap, point->vec);

        local = isl_local_alloc_from_mat(isl_basic_map_get_divs(bmap));
        vec = isl_point_get_vec(point);
        vec = isl_local_extend_point_vec(local, vec);
        isl_local_free(local);

        contains = isl_basic_map_contains(bmap, vec);

        isl_vec_free(vec);
        return contains;
}

isl_bool isl_map_contains_point(__isl_keep isl_map *map,
        __isl_keep isl_point *point)
{
        int i;
        isl_bool found = isl_bool_false;

        if (!map || !point)
                return isl_bool_error;

        map = isl_map_copy(map);
        map = isl_map_compute_divs(map);
        if (!map)
                return isl_bool_error;

        for (i = 0; i < map->n; ++i) {
                found = isl_basic_map_contains_point(map->p[i], point);
                if (found < 0)
                        goto error;
                if (found)
                        break;
        }
        isl_map_free(map);

        return found;
error:
        isl_map_free(map);
        return isl_bool_error;
}

isl_bool isl_set_contains_point(__isl_keep isl_set *set,
        __isl_keep isl_point *point)
{
        return isl_map_contains_point(set_to_map(set), point);
}

__isl_give isl_basic_set *isl_basic_set_from_point(__isl_take isl_point *pnt)
{
        isl_basic_set *bset;
        isl_basic_set *model;

        if (!pnt)
                return NULL;

        model = isl_basic_set_empty(isl_space_copy(pnt->dim));
        bset = isl_basic_set_from_vec(isl_vec_copy(pnt->vec));
        bset = isl_basic_set_from_underlying_set(bset, model);
        isl_point_free(pnt);

        return bset;
}

__isl_give isl_set *isl_set_from_point(__isl_take isl_point *pnt)
{
        isl_basic_set *bset;
        bset = isl_basic_set_from_point(pnt);
        return isl_set_from_basic_set(bset);
}

/* This function performs the same operation as isl_set_from_point,
 * but is considered as a function on an isl_point when exported.
 */
__isl_give isl_set *isl_point_to_set(__isl_take isl_point *pnt)
{
        return isl_set_from_point(pnt);
}

/* Construct a union set, containing the single element "pnt".
 * If "pnt" is void, then return an empty union set.
 */
__isl_give isl_union_set *isl_union_set_from_point(__isl_take isl_point *pnt)
{
        if (!pnt)
                return NULL;
        if (isl_point_is_void(pnt)) {
                isl_space *space;

                space = isl_point_get_space(pnt);
                isl_point_free(pnt);
                return isl_union_set_empty(space);
        }

        return isl_union_set_from_set(isl_set_from_point(pnt));
}

__isl_give isl_basic_set *isl_basic_set_box_from_points(
        __isl_take isl_point *pnt1, __isl_take isl_point *pnt2)
{
        isl_basic_set *bset = NULL;
        isl_size total;
        int i;
        int k;
        isl_int t;

        isl_int_init(t);

        if (!pnt1 || !pnt2)
                goto error;

        isl_assert(pnt1->dim->ctx,
                        isl_space_is_equal(pnt1->dim, pnt2->dim), goto error);

        if (isl_point_is_void(pnt1) && isl_point_is_void(pnt2)) {
                isl_space *space = isl_space_copy(pnt1->dim);
                isl_point_free(pnt1);
                isl_point_free(pnt2);
                isl_int_clear(t);
                return isl_basic_set_empty(space);
        }
        if (isl_point_is_void(pnt1)) {
                isl_point_free(pnt1);
                isl_int_clear(t);
                return isl_basic_set_from_point(pnt2);
        }
        if (isl_point_is_void(pnt2)) {
                isl_point_free(pnt2);
                isl_int_clear(t);
                return isl_basic_set_from_point(pnt1);
        }

        total = isl_point_dim(pnt1, isl_dim_all);
        if (total < 0)
                goto error;
        bset = isl_basic_set_alloc_space(isl_space_copy(pnt1->dim), 0, 0, 2 * total);

        for (i = 0; i < total; ++i) {
                isl_int_mul(t, pnt1->vec->el[1 + i], pnt2->vec->el[0]);
                isl_int_submul(t, pnt2->vec->el[1 + i], pnt1->vec->el[0]);

                k = isl_basic_set_alloc_inequality(bset);
                if (k < 0)
                        goto error;
                isl_seq_clr(bset->ineq[k] + 1, total);
                if (isl_int_is_pos(t)) {
                        isl_int_set_si(bset->ineq[k][1 + i], -1);
                        isl_int_set(bset->ineq[k][0], pnt1->vec->el[1 + i]);
                } else {
                        isl_int_set_si(bset->ineq[k][1 + i], 1);
                        isl_int_neg(bset->ineq[k][0], pnt1->vec->el[1 + i]);
                }
                isl_int_fdiv_q(bset->ineq[k][0], bset->ineq[k][0], pnt1->vec->el[0]);

                k = isl_basic_set_alloc_inequality(bset);
                if (k < 0)
                        goto error;
                isl_seq_clr(bset->ineq[k] + 1, total);
                if (isl_int_is_pos(t)) {
                        isl_int_set_si(bset->ineq[k][1 + i], 1);
                        isl_int_neg(bset->ineq[k][0], pnt2->vec->el[1 + i]);
                } else {
                        isl_int_set_si(bset->ineq[k][1 + i], -1);
                        isl_int_set(bset->ineq[k][0], pnt2->vec->el[1 + i]);
                }
                isl_int_fdiv_q(bset->ineq[k][0], bset->ineq[k][0], pnt2->vec->el[0]);
        }

        bset = isl_basic_set_finalize(bset);

        isl_point_free(pnt1);
        isl_point_free(pnt2);

        isl_int_clear(t);

        return bset;
error:
        isl_point_free(pnt1);
        isl_point_free(pnt2);
        isl_int_clear(t);
        isl_basic_set_free(bset);
        return NULL;
}

__isl_give isl_set *isl_set_box_from_points(__isl_take isl_point *pnt1,
        __isl_take isl_point *pnt2)
{
        isl_basic_set *bset;
        bset = isl_basic_set_box_from_points(pnt1, pnt2);
        return isl_set_from_basic_set(bset);
}

/* Print the coordinate at position "pos" of the point "pnt".
 */
static __isl_give isl_printer *print_coordinate(__isl_take isl_printer *p,
        struct isl_print_space_data *data, unsigned pos)
{
        isl_point *pnt = data->user;
        isl_size off;

        off = isl_space_offset(data->space, data->type);
        if (off < 0)
                return isl_printer_free(p);
        pos += off;
        p = isl_printer_print_isl_int(p, pnt->vec->el[1 + pos]);
        if (!isl_int_is_one(pnt->vec->el[0])) {
                p = isl_printer_print_str(p, "/");
                p = isl_printer_print_isl_int(p, pnt->vec->el[0]);
        }

        return p;
}

__isl_give isl_printer *isl_printer_print_point(
        __isl_take isl_printer *p, __isl_keep isl_point *pnt)
{
        struct isl_print_space_data data = { 0 };
        int i;
        isl_size nparam;

        if (!pnt)
                return p;
        if (isl_point_is_void(pnt)) {
                p = isl_printer_print_str(p, "void");
                return p;
        }

        nparam = isl_point_dim(pnt, isl_dim_param);
        if (nparam < 0)
                return isl_printer_free(p);
        if (nparam > 0) {
                p = isl_printer_print_str(p, "[");
                for (i = 0; i < nparam; ++i) {
                        const char *name;
                        if (i)
                                p = isl_printer_print_str(p, ", ");
                        name = isl_space_get_dim_name(pnt->dim, isl_dim_param, i);
                        if (name) {
                                p = isl_printer_print_str(p, name);
                                p = isl_printer_print_str(p, " = ");
                        }
                        p = isl_printer_print_isl_int(p, pnt->vec->el[1 + i]);
                        if (!isl_int_is_one(pnt->vec->el[0])) {
                                p = isl_printer_print_str(p, "/");
                                p = isl_printer_print_isl_int(p, pnt->vec->el[0]);
                        }
                }
                p = isl_printer_print_str(p, "]");
                p = isl_printer_print_str(p, " -> ");
        }
        data.print_dim = &print_coordinate;
        data.user = pnt;
        p = isl_printer_print_str(p, "{ ");
        p = isl_print_space(pnt->dim, p, 0, &data);
        p = isl_printer_print_str(p, " }");
        return p;
}