isl_tab: optionally keep track of row signs

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

diff --git a/isl_seq.c b/isl_seq.c
index 532b8e6..73af52d 100644 (file)
--- a/isl_seq.c
+++ b/isl_seq.c
@@ -160,6 +160,16 @@ int isl_seq_first_non_zero(isl_int *p, unsigned len)
        return -1;
 }
 
+int isl_seq_last_non_zero(isl_int *p, unsigned len)
+{
+       int i;
+
+       for (i = len - 1; i >= 0; --i)
+               if (!isl_int_is_zero(p[i]))
+                       return i;
+       return -1;
+}
+
 int isl_seq_abs_min_non_zero(isl_int *p, unsigned len)
 {
        int i, min = isl_seq_first_non_zero(p, len);