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      1 /*
      2  * Copyright 2010      INRIA Saclay
      3  *
      4  * Use of this software is governed by the MIT license
      5  *
      6  * Written by Sven Verdoolaege, INRIA Saclay - Ile-de-France,
      7  * Parc Club Orsay Universite, ZAC des vignes, 4 rue Jacques Monod,
      8  * 91893 Orsay, France
      9  */
     10 
     11 #include <isl_union_macro.h>
     12 
     13 /* Evaluate "u" in the void point "pnt".
     14  * In particular, return the value NaN.
     15  */
     16 static __isl_give isl_val *FN(UNION,eval_void)(__isl_take UNION *u,
     17 	__isl_take isl_point *pnt)
     18 {
     19 	isl_ctx *ctx;
     20 
     21 	ctx = isl_point_get_ctx(pnt);
     22 	FN(UNION,free)(u);
     23 	isl_point_free(pnt);
     24 	return isl_val_nan(ctx);
     25 }
     26 
     27 /* Internal data structure for isl_union_*_eval.
     28  *
     29  * "pnt" is the point in which the function is evaluated.
     30  * "v" stores the result and is initialized to zero.
     31  */
     32 S(UNION,eval_data) {
     33 	isl_point *pnt;
     34 	isl_val *v;
     35 };
     36 
     37 /* Update the evaluation in data->v based on the evaluation of "part".
     38  *
     39  * Only (at most) a single part on which this function is called
     40  * is assumed to evaluate to anything other than zero.
     41  * Since the value is initialized to zero, the evaluation of "part"
     42  * can simply be added.
     43  */
     44 static isl_stat FN(UNION,eval_entry)(__isl_take PART *part, void *user)
     45 {
     46 	S(UNION,eval_data) *data = user;
     47 	isl_val *v;
     48 
     49 	v = FN(PART,eval)(part, isl_point_copy(data->pnt));
     50 	data->v = isl_val_add(data->v, v);
     51 
     52 	return isl_stat_non_null(data->v);
     53 }
     54 
     55 /* Evaluate "u" in the point "pnt".
     56  */
     57 __isl_give isl_val *FN(UNION,eval)(__isl_take UNION *u,
     58 	__isl_take isl_point *pnt)
     59 {
     60 	S(UNION,eval_data) data = { pnt };
     61 	isl_bool is_void;
     62 	isl_space *space;
     63 
     64 	is_void = isl_point_is_void(pnt);
     65 	if (is_void < 0)
     66 		goto error;
     67 	if (is_void)
     68 		return FN(UNION,eval_void)(u, pnt);
     69 
     70 	data.v = isl_val_zero(isl_point_get_ctx(pnt));
     71 	space = isl_point_peek_space(pnt);
     72 	if (FN(UNION,foreach_on_domain)(u, space,
     73 					&FN(UNION,eval_entry), &data) < 0)
     74 		data.v = isl_val_free(data.v);
     75 	FN(UNION,free)(u);
     76 	isl_point_free(pnt);
     77 	return data.v;
     78 error:
     79 	FN(UNION,free)(u);
     80 	isl_point_free(pnt);
     81 	return NULL;
     82 }
     83