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68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
/*
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* Copyright 2012 Ecole Normale Superieure
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* Copyright 2017 Sven Verdoolaege
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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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* Ecole Normale Superieure, 45 rue d'Ulm, 75230 Paris, France
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*/
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#define xFN(TYPE,NAME) TYPE ## _ ## NAME
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#define FN(TYPE,NAME) xFN(TYPE,NAME)
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/* Drop the "n" domain dimensions starting at "first" from "obj",
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* after checking that they do not appear in the affine expression.
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*/
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static __isl_give TYPE *FN(TYPE,drop_domain)(__isl_take TYPE *obj,
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unsigned first, unsigned n)
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{
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isl_bool involves;
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involves = FN(TYPE,involves_dims)(obj, isl_dim_in, first, n);
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if (involves < 0)
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return FN(TYPE,free)(obj);
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if (involves)
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isl_die(FN(TYPE,get_ctx)(obj), isl_error_invalid,
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"affine expression involves some of the domain dimensions",
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return FN(TYPE,free)(obj));
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return FN(TYPE,drop_dims)(obj, isl_dim_in, first, n);
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}
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/* Check that the domain of "obj" is a product.
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*/
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static isl_stat FN(TYPE,check_domain_product)(__isl_keep TYPE *obj)
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{
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isl_bool is_product;
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is_product = FN(TYPE,domain_is_product)(obj);
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if (is_product < 0)
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return isl_stat_error;
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if (!is_product)
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isl_die(FN(TYPE,get_ctx)(obj), isl_error_invalid,
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"domain is not a product", return isl_stat_error);
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return isl_stat_ok;
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}
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/* Given an affine function with a domain of the form [A -> B] that
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* does not depend on B, return the same function on domain A.
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*/
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__isl_give TYPE *FN(TYPE,domain_factor_domain)(__isl_take TYPE *obj)
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{
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isl_space *space;
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isl_size n, n_in;
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if (FN(TYPE,check_domain_product)(obj) < 0)
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return FN(TYPE,free)(obj);
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space = FN(TYPE,get_domain_space)(obj);
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n = isl_space_dim(space, isl_dim_set);
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space = isl_space_factor_domain(space);
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n_in = isl_space_dim(space, isl_dim_set);
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if (n < 0 || n_in < 0)
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obj = FN(TYPE,free)(obj);
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else
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obj = FN(TYPE,drop_domain)(obj, n_in, n - n_in);
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obj = FN(TYPE,reset_domain_space)(obj, space);
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return obj;
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}
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