* lambda-code.c (lambda_vector_lexico_pos): Moved...

	* lambda.h (lambda_vector_lexico_pos): ... here.
	* tree-data-ref.c (build_classic_dist_vector): Return false when
	the distance vector is lexicographically negative.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@103392 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 21 insertions, 0 deletions

diff --git a/gcc/lambda.h b/gcc/lambda.h
index dea12ef6098..9855b6f73ed 100644
--- a/gcc/lambda.h
+++ b/gcc/lambda.h
@@ -376,5 +376,26 @@ print_lambda_vector (FILE * outfile, lambda_vector vector, int n)
     fprintf (outfile, "%3d ", vector[i]);
   fprintf (outfile, "\n");
 }
+
+/* Returns true when the vector V is lexicographically positive, in
+   other words, when the first nonzero element is positive.  */
+
+static inline bool
+lambda_vector_lexico_pos (lambda_vector v, 
+			  unsigned n)
+{
+  unsigned i;
+  for (i = 0; i < n; i++)
+    {
+      if (v[i] == 0)
+	continue;
+      if (v[i] < 0)
+	return false;
+      if (v[i] > 0)
+	return true;
+    }
+  return true;
+}
+
 #endif /* LAMBDA_H  */