Fourier transform and convolution subroutines for the IBM 3090 Vector Facility
R. C. Agarwal, James W. Cooley · IBM Journal of Research and Development · 1986
A set of highly optimized subroutines for digital signal processing has been included in the Engineering and Scientific Subroutine Library (ESSL) for the IBM 3090 Vector Facility. These include FORTRAN-callable subroutines for Fourier transforms, convolution, and correlation. The subroutines are carefully designed and tuned for optimal vector and cache performance. Speedups of up to 9½ times over scalar performance on the 3090 have been obtained.