Developer Reference for Intel® oneAPI Math Kernel Library for C

ID 766684
Date 11/07/2023
Public

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FFTW Support Functions

The FFTW wrappers provide memory allocation functions to be used with FFTW:

void* fftw_malloc(size_t n);

void fftw_free(void* x);

The fftw_malloc wrapper aligns the memory on a 16-byte boundary.

If fftw_malloc fails to allocate memory, it aborts the application. To override this behavior, set a global variable fftw_malloc_hook and optionally the complementary variable fftw_free_hook:

void *(*fftw_malloc_hook) (size_t n);

void (*fftw_free_hook) (void *p);

The wrappers use the function fftw_die to abort the application in cases when a caller cannot be informed of an error otherwise (for example, in computational functions that return void). To override this behavior, set a global variable fftw_die_hook:

void (*fftw_die_hook)(const char *error_string);

void fftw_die(const char *s);