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+djbfft is an extremely fast library for floating-point convolution.
+The current version holds most of the speed records for double-precision
+FFTs on general-purpose computers.
+
+djbfft provides power-of-2 complex FFTs, real FFTs at twice the
+speed, and fast multiplication of complex arrays. Single precision
+and double precision are equally supported.
+
+WWW: http://cr.yp.to/djbfft.html