X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=isl_morph.c;h=b5bfa18ad6a24c1a077ce311ae6f821b605dba72;hb=1e216c772628e7a8481d7bd5c8b7ed0fb6572fe7;hp=a888f4cb9314b0d7f66e86182c3788c27bb56762;hpb=db847315005909df04467d48b2887b6496017bf6;p=platform%2Fupstream%2Fisl.git

diff --git a/isl_morph.c b/isl_morph.c
index a888f4c..b5bfa18 100644
--- a/isl_morph.c
+++ b/isl_morph.c
@@ -1,7 +1,7 @@
 /*
  * Copyright 2010      INRIA Saclay
  *
- * Use of this software is governed by the GNU LGPLv2.1 license
+ * 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,
@@ -316,7 +316,7 @@ error:
 	return NULL;
 }
 
-/* Given a basic set, exploit the equalties in the a basic set to construct
+/* Given a basic set, exploit the equalties in the basic set to construct
  * a morphishm that maps the basic set to a lower-dimensional space.
  * Specifically, the morphism reduces the number of dimensions of type "type".
  *
@@ -520,7 +520,7 @@ __isl_give isl_morph *isl_basic_set_parameter_compression(
 	H = isl_mat_right_inverse(H);
 	if (!H || !d)
 		goto error;
-	isl_seq_set(d->el, H->row[0][0], d->size);
+	d = isl_vec_set(d, H->row[0][0]);
 	H = isl_mat_drop_rows(H, 0, 1);
 	H = isl_mat_drop_cols(H, 0, 1);
 	B = isl_mat_product(H, B);
@@ -581,6 +581,7 @@ static __isl_give isl_basic_set *add_strides(__isl_take isl_basic_set *bset,
 		div = isl_basic_set_alloc_div(bset);
 		if (div < 0)
 			goto error;
+		isl_int_set_si(bset->div[div][0], 0);
 		k = isl_basic_set_alloc_equality(bset);
 		if (k < 0)
 			goto error;
@@ -784,12 +785,20 @@ __isl_give isl_morph *isl_morph_inverse(__isl_take isl_morph *morph)
 	return morph;
 }
 
+/* We detect all the equalities first to avoid implicit equalties
+ * being discovered during the computations.  In particular,
+ * the compression on the variables could expose additional stride
+ * constraints on the parameters.  This would result in existentially
+ * quantified variables after applying the resulting morph, which
+ * in turn could break invariants of the calling functions.
+ */
 __isl_give isl_morph *isl_basic_set_full_compression(
 	__isl_keep isl_basic_set *bset)
 {
 	isl_morph *morph, *morph2;
 
 	bset = isl_basic_set_copy(bset);
+	bset = isl_basic_set_detect_equalities(bset);
 
 	morph = isl_basic_set_variable_compression(bset, isl_dim_param);
 	bset = isl_morph_basic_set(isl_morph_copy(morph), bset);