From: Sven Verdoolaege <skimo@kotnet.org>
Date: Sat, 26 Mar 2011 14:18:17 +0000 (+0100)
Subject: add isl_mat_initial_non_zero_cols
X-Git-Tag: isl-0.07~247
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=79f39689bc1521ec66cec1add03b45aa71d2a9ea;p=platform%2Fupstream%2Fisl.git

add isl_mat_initial_non_zero_cols

Signed-off-by: Sven Verdoolaege <skimo@kotnet.org>
---

diff --git a/include/isl/mat.h b/include/isl/mat.h
index f888e7a..1dbb84a 100644
--- a/include/isl/mat.h
+++ b/include/isl/mat.h
@@ -102,6 +102,8 @@ __isl_give isl_mat *isl_mat_vec_concat(__isl_take isl_mat *top,
 
 int isl_mat_is_equal(__isl_keep isl_mat *mat1, __isl_keep isl_mat *mat2);
 
+int isl_mat_initial_non_zero_cols(__isl_keep isl_mat *mat);
+
 void isl_mat_dump(struct isl_mat *mat, FILE *out, int indent);
 
 #if defined(__cplusplus)
diff --git a/isl_mat.c b/isl_mat.c
index 6dc9d19..9a8a558 100644
--- a/isl_mat.c
+++ b/isl_mat.c
@@ -1483,3 +1483,19 @@ __isl_give isl_mat *isl_mat_normalize(__isl_take isl_mat *mat)
 
 	return mat;
 }
+
+/* Number of initial non-zero columns.
+ */
+int isl_mat_initial_non_zero_cols(__isl_keep isl_mat *mat)
+{
+	int i;
+
+	if (!mat)
+		return -1;
+
+	for (i = 0; i < mat->n_col; ++i)
+		if (row_first_non_zero(mat->row, mat->n_row, i) < 0)
+			break;
+
+	return i;
+}