Fix FFT size 2, FFT size 2 and 4 don't need/use lookup tables.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/ffts.c b/src/ffts.c
index 3def70d..5ff5eb2 100644
--- a/src/ffts.c
+++ b/src/ffts.c
@@ -500,7 +500,8 @@ ffts_plan_t *ffts_init_1d(size_t N, int sign)
     p->destroy = ffts_free_1d;
     p->N = N;
 
-    if (ffts_generate_luts(p, N, leaf_N, sign)) {
+	/* generate lookup tables */
+    if (N > 4 && ffts_generate_luts(p, N, leaf_N, sign)) {
         goto cleanup;
     }