add isl_aff_mod_val

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

diff --git a/isl_aff.c b/isl_aff.c
index b7dc28a..51f95c8 100644 (file)
--- a/isl_aff.c
+++ b/isl_aff.c
@@ -1311,6 +1311,37 @@ __isl_give isl_aff *isl_aff_mod(__isl_take isl_aff *aff, isl_int m)
 
 /* Compute
  *
+ *     aff mod m = aff - m * floor(aff/m)
+ *
+ * with m an integer value.
+ */
+__isl_give isl_aff *isl_aff_mod_val(__isl_take isl_aff *aff,
+       __isl_take isl_val *m)
+{
+       isl_aff *res;
+
+       if (!aff || !m)
+               goto error;
+
+       if (!isl_val_is_int(m))
+               isl_die(isl_val_get_ctx(m), isl_error_invalid,
+                       "expecting integer modulo", goto error);
+
+       res = isl_aff_copy(aff);
+       aff = isl_aff_scale_down_val(aff, isl_val_copy(m));
+       aff = isl_aff_floor(aff);
+       aff = isl_aff_scale_val(aff, m);
+       res = isl_aff_sub(res, aff);
+
+       return res;
+error:
+       isl_aff_free(aff);
+       isl_val_free(m);
+       return NULL;
+}
+
+/* Compute
+ *
  *     pwaff mod m = pwaff - m * floor(pwaff/m)
  */
 __isl_give isl_pw_aff *isl_pw_aff_mod(__isl_take isl_pw_aff *pwaff, isl_int m)
@@ -1574,6 +1605,37 @@ __isl_give isl_aff *isl_aff_scale_down(__isl_take isl_aff *aff, isl_int f)
        return aff;
 }
 
+/* Divide "aff" by "v".
+ */
+__isl_give isl_aff *isl_aff_scale_down_val(__isl_take isl_aff *aff,
+       __isl_take isl_val *v)
+{
+       if (!aff || !v)
+               goto error;
+
+       if (isl_val_is_one(v)) {
+               isl_val_free(v);
+               return aff;
+       }
+
+       if (!isl_val_is_rat(v))
+               isl_die(isl_aff_get_ctx(aff), isl_error_invalid,
+                       "expecting rational factor", goto error);
+       if (!isl_val_is_pos(v))
+               isl_die(isl_aff_get_ctx(aff), isl_error_invalid,
+                       "factor needs to be positive", goto error);
+
+       aff = isl_aff_scale(aff, v->d);
+       aff = isl_aff_scale_down(aff, v->n);
+
+       isl_val_free(v);
+       return aff;
+error:
+       isl_aff_free(aff);
+       isl_val_free(v);
+       return NULL;
+}
+
 __isl_give isl_aff *isl_aff_scale_down_ui(__isl_take isl_aff *aff, unsigned f)
 {
        isl_int v;