isl_ast_codegen.c: for_inc: handle NULL input

[platform/upstream/isl.git] / isl_multi_templ.c

diff --git a/isl_multi_templ.c b/isl_multi_templ.c
index 61c1b27..7080493 100644 (file)
--- a/isl_multi_templ.c
+++ b/isl_multi_templ.c
@@ -345,7 +345,7 @@ __isl_give MULTI(BASE) *FN(MULTI(BASE),realign_domain)(
 
        multi = FN(MULTI(BASE),cow)(multi);
        if (!multi || !exp)
-               return NULL;
+               goto error;
 
        for (i = 0; i < multi->n; ++i) {
                multi->p[i] = FN(EL,realign_domain)(multi->p[i],
@@ -742,3 +742,55 @@ error:
        FN(MULTI(BASE),free)(multi2);
        return NULL;
 }
+
+/* Given two multi expressions, "multi1"
+ *
+ *     [A1 A2] -> [B1 B2]
+ *
+ * where A2 starts at position "in_pos" and B2 starts at position "out_pos",
+ * and "multi2"
+ *
+ *     [C] -> [D]
+ *
+ * return the multi expression
+ *
+ *     [A1 C A2] -> [B1 D B2]
+ *
+ * We first insert input dimensions to obtain
+ *
+ *     [A1 C A2] -> [B1 B2]
+ *
+ * and
+ *
+ *     [A1 C A2] -> [D]
+ *
+ * and then apply range_splice.
+ */
+__isl_give MULTI(BASE) *FN(MULTI(BASE),splice)(
+       __isl_take MULTI(BASE) *multi1, unsigned in_pos, unsigned out_pos,
+       __isl_take MULTI(BASE) *multi2)
+{
+       unsigned n_in1;
+       unsigned n_in2;
+
+       if (!multi1 || !multi2)
+               goto error;
+
+       n_in1 = FN(MULTI(BASE),dim)(multi1, isl_dim_in);
+       if (in_pos > n_in1)
+               isl_die(FN(MULTI(BASE),get_ctx)(multi1), isl_error_invalid,
+                       "index out of bounds", goto error);
+
+       n_in2 = FN(MULTI(BASE),dim)(multi2, isl_dim_in);
+
+       multi1 = FN(MULTI(BASE),insert_dims)(multi1, isl_dim_in, in_pos, n_in2);
+       multi2 = FN(MULTI(BASE),insert_dims)(multi2, isl_dim_in, n_in2,
+                                               n_in1 - in_pos);
+       multi2 = FN(MULTI(BASE),insert_dims)(multi2, isl_dim_in, 0, in_pos);
+
+       return FN(MULTI(BASE),range_splice)(multi1, out_pos, multi2);
+error:
+       FN(MULTI(BASE),free)(multi1);
+       FN(MULTI(BASE),free)(multi2);
+       return NULL;
+}