The configuration parameter DFTI_PRECISION denotes the floating-point precision in which the transform is to be carried out. A setting of DFTI_SINGLE stands for single precision, and a setting of DFTI_DOUBLE stands for double precision. The data is meant to be presented in this precision, the computation will be carried out in this precision, and the result will be delivered in this precision.
DFTI_PRECISION is one of the four settable configuration parameters that do not have a default value. Set them explicitly by calling the DftiCreateDescriptor function.
Fortran module MKL_DFTI also defines named constants DFTI_SINGLE_R and DFTI_DOUBLE_R, with the same semantics as DFTI_SINGLE and DFTI_DOUBLE, respectively. Do not use these constants directly. They only facilitate access to precision-specific functions for the generic name DftiCreateDescriptor through the modification of the "USE MKL_DFTI" statement.
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