diff -ru fftw-2.1.5.orig/fftw/putils.c fftw-2.1.5/fftw/putils.c
--- fftw-2.1.5.orig/fftw/putils.c	Sat Jul 24 22:01:23 1999
+++ fftw-2.1.5/fftw/putils.c	Fri Aug 18 17:41:10 2000
@@ -39,8 +39,8 @@
  * These two constants are used for the FFTW_ESTIMATE flag to help
  * create a heuristic plan.  They don't affect FFTW_MEASURE.
  */
-#define NOTW_OPTIMAL_SIZE 32
-#define TWIDDLE_OPTIMAL_SIZE 12
+#define NOTW_OPTIMAL_SIZE 8
+#define TWIDDLE_OPTIMAL_SIZE 8
 
 #define IS_POWER_OF_TWO(n) (((n) & ((n) - 1)) == 0)