forked from OSchip/llvm-project
143 lines
4.0 KiB
C
143 lines
4.0 KiB
C
/*
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* Copyright 2010 INRIA Saclay
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* Copyright 2012 Ecole Normale Superieure
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*
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* Use of this software is governed by the MIT license
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*
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* Written by Sven Verdoolaege,
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* INRIA Saclay - Ile-de-France, Parc Club Orsay Universite,
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* ZAC des vignes, 4 rue Jacques Monod, 91893 Orsay, France
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* and Ecole Normale Superieure, 45 rue d’Ulm, 75230 Paris, France
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*/
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/* Function for computing the lexicographic optimum of a map
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* in the form of either an isl_map or an isl_pw_multi_aff.
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*/
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#define xSF(TYPE,SUFFIX) TYPE ## SUFFIX
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#define SF(TYPE,SUFFIX) xSF(TYPE,SUFFIX)
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/* Given a basic map "bmap", compute the lexicographically minimal
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* (or maximal) image element for each domain element in dom.
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* Set *empty to those elements in dom that do not have an image element.
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*
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* We first make sure the basic sets in dom are disjoint and then
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* simply collect the results over each of the basic sets separately.
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* We could probably improve the efficiency a bit by moving the union
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* domain down into the parametric integer programming.
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*/
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static __isl_give TYPE *SF(basic_map_partial_lexopt,SUFFIX)(
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__isl_take isl_basic_map *bmap, __isl_take isl_set *dom,
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__isl_give isl_set **empty, int max)
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{
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int i;
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TYPE *res;
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dom = isl_set_make_disjoint(dom);
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if (!dom)
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goto error;
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if (isl_set_plain_is_empty(dom)) {
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isl_space *space = isl_basic_map_get_space(bmap);
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if (empty)
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*empty = dom;
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else
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isl_set_free(dom);
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isl_basic_map_free(bmap);
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return EMPTY(space);
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}
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res = SF(isl_basic_map_partial_lexopt,SUFFIX)(isl_basic_map_copy(bmap),
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isl_basic_set_copy(dom->p[0]), empty, max);
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for (i = 1; i < dom->n; ++i) {
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TYPE *res_i;
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isl_set *empty_i;
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res_i = SF(isl_basic_map_partial_lexopt,SUFFIX)(
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isl_basic_map_copy(bmap),
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isl_basic_set_copy(dom->p[i]), &empty_i, max);
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res = ADD(res, res_i);
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*empty = isl_set_union_disjoint(*empty, empty_i);
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}
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isl_set_free(dom);
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isl_basic_map_free(bmap);
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return res;
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error:
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*empty = NULL;
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isl_set_free(dom);
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isl_basic_map_free(bmap);
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return NULL;
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}
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static __isl_give TYPE *SF(isl_map_partial_lexopt_aligned,SUFFIX)(
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__isl_take isl_map *map, __isl_take isl_set *dom,
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__isl_give isl_set **empty, int max);
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/* Given a map "map", compute the lexicographically minimal
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* (or maximal) image element for each domain element in dom.
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* Set *empty to those elements in dom that do not have an image element.
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*
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* Align parameters if needed and then call isl_map_partial_lexopt_aligned.
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*/
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static __isl_give TYPE *SF(isl_map_partial_lexopt,SUFFIX)(
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__isl_take isl_map *map, __isl_take isl_set *dom,
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__isl_give isl_set **empty, int max)
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{
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if (!map || !dom)
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goto error;
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if (isl_space_match(map->dim, isl_dim_param, dom->dim, isl_dim_param))
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return SF(isl_map_partial_lexopt_aligned,SUFFIX)(map, dom,
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empty, max);
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if (!isl_space_has_named_params(map->dim) ||
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!isl_space_has_named_params(dom->dim))
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isl_die(map->ctx, isl_error_invalid,
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"unaligned unnamed parameters", goto error);
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map = isl_map_align_params(map, isl_map_get_space(dom));
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dom = isl_map_align_params(dom, isl_map_get_space(map));
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return SF(isl_map_partial_lexopt_aligned,SUFFIX)(map, dom, empty, max);
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error:
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if (empty)
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*empty = NULL;
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isl_set_free(dom);
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isl_map_free(map);
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return NULL;
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}
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__isl_give TYPE *SF(isl_map_lexopt,SUFFIX)(__isl_take isl_map *map, int max)
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{
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isl_set *dom = NULL;
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isl_space *dom_space;
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if (!map)
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goto error;
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dom_space = isl_space_domain(isl_space_copy(map->dim));
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dom = isl_set_universe(dom_space);
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return SF(isl_map_partial_lexopt,SUFFIX)(map, dom, NULL, max);
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error:
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isl_map_free(map);
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return NULL;
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}
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__isl_give TYPE *SF(isl_map_lexmin,SUFFIX)(__isl_take isl_map *map)
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{
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return SF(isl_map_lexopt,SUFFIX)(map, 0);
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}
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__isl_give TYPE *SF(isl_map_lexmax,SUFFIX)(__isl_take isl_map *map)
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{
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return SF(isl_map_lexopt,SUFFIX)(map, 1);
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}
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__isl_give TYPE *SF(isl_set_lexmin,SUFFIX)(__isl_take isl_set *set)
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{
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return SF(isl_map_lexmin,SUFFIX)(set);
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}
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__isl_give TYPE *SF(isl_set_lexmax,SUFFIX)(__isl_take isl_set *set)
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{
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return SF(isl_map_lexmax,SUFFIX)(set);
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}
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