only one backwards

1 files changed, 2 insertions, 4 deletions

diff --git a/dda.c b/dda.c
index 25dbd6c..dcc3dca 100644
--- a/dda.c
+++ b/dda.c
@@ -113,14 +113,12 @@ dda (test_data_t *testdata)
 	}
 	else
 	{
-	    double s = sample_step_x_backward (xi);
+	    double s;
 
-	    while (e > s * dy)
+	    while (s = sample_step_x_backward (xi), e > s * dy)
 	    {
 		e -= s * dy;
 		xi -= s;
-
-		s = sample_step_x_backward (xi);
 	    }
 	}