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pffft.c
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/* Copyright (c) 2013 Julien Pommier ( [email protected] )
Copyright (c) 2020 Hayati Ayguen ( [email protected] )
Based on original fortran 77 code from FFTPACKv4 from NETLIB
(http://www.netlib.org/fftpack), authored by Dr Paul Swarztrauber
of NCAR, in 1985.
As confirmed by the NCAR fftpack software curators, the following
FFTPACKv5 license applies to FFTPACKv4 sources. My changes are
released under the same terms.
FFTPACK license:
http://www.cisl.ucar.edu/css/software/fftpack5/ftpk.html
Copyright (c) 2004 the University Corporation for Atmospheric
Research ("UCAR"). All rights reserved. Developed by NCAR's
Computational and Information Systems Laboratory, UCAR,
www.cisl.ucar.edu.
Redistribution and use of the Software in source and binary forms,
with or without modification, is permitted provided that the
following conditions are met:
- Neither the names of NCAR's Computational and Information Systems
Laboratory, the University Corporation for Atmospheric Research,
nor the names of its sponsors or contributors may be used to
endorse or promote products derived from this Software without
specific prior written permission.
- Redistributions of source code must retain the above copyright
notices, this list of conditions, and the disclaimer below.
- Redistributions in binary form must reproduce the above copyright
notice, this list of conditions, and the disclaimer below in the
documentation and/or other materials provided with the
distribution.
THIS SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE CONTRIBUTORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES OR OTHER LIABILITY, WHETHER IN AN
ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE
SOFTWARE.
PFFFT : a Pretty Fast FFT.
This file is largerly based on the original FFTPACK implementation, modified in
order to take advantage of SIMD instructions of modern CPUs.
*/
/*
ChangeLog:
- 2011/10/02, version 1: This is the very first release of this file.
*/
#include "pffft.h"
/* detect compiler flavour */
#if defined(_MSC_VER)
# define COMPILER_MSVC
#elif defined(__GNUC__)
# define COMPILER_GCC
#endif
#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <math.h>
#include <assert.h>
#if defined(COMPILER_GCC)
# define ALWAYS_INLINE(return_type) inline return_type __attribute__ ((always_inline))
# define NEVER_INLINE(return_type) return_type __attribute__ ((noinline))
# define RESTRICT __restrict
# define VLA_ARRAY_ON_STACK(type__, varname__, size__) type__ varname__[size__];
#elif defined(COMPILER_MSVC)
# define ALWAYS_INLINE(return_type) __forceinline return_type
# define NEVER_INLINE(return_type) __declspec(noinline) return_type
# define RESTRICT __restrict
# define VLA_ARRAY_ON_STACK(type__, varname__, size__) type__ *varname__ = (type__*)_alloca(size__ * sizeof(type__))
#endif
#ifdef COMPILER_MSVC
#pragma warning( disable : 4244 4305 4204 4456 )
#endif
/*
vector support macros: the rest of the code is independant of
SSE/Altivec/NEON -- adding support for other platforms with 4-element
vectors should be limited to these macros
*/
#include "simd/pf_float.h"
/* have code comparable with this definition */
#define SETUP_STRUCT PFFFT_Setup
#define FUNC_NEW_SETUP pffft_new_setup
#define FUNC_DESTROY pffft_destroy_setup
#define FUNC_TRANSFORM_UNORDRD pffft_transform
#define FUNC_TRANSFORM_ORDERED pffft_transform_ordered
#define FUNC_ZREORDER pffft_zreorder
#define FUNC_ZCONVOLVE_ACCUMULATE pffft_zconvolve_accumulate
#define FUNC_ZCONVOLVE_NO_ACCU pffft_zconvolve_no_accu
#define FUNC_ALIGNED_MALLOC pffft_aligned_malloc
#define FUNC_ALIGNED_FREE pffft_aligned_free
#define FUNC_SIMD_SIZE pffft_simd_size
#define FUNC_SIMD_ARCH pffft_simd_arch
#define FUNC_VALIDATE_SIMD_A validate_pffft_simd
#define FUNC_VALIDATE_SIMD_EX validate_pffft_simd_ex
#define FUNC_CPLX_FINALIZE pffft_cplx_finalize
#define FUNC_CPLX_PREPROCESS pffft_cplx_preprocess
#define FUNC_REAL_PREPROCESS_4X4 pffft_real_preprocess_4x4
#define FUNC_REAL_PREPROCESS pffft_real_preprocess
#define FUNC_REAL_FINALIZE_4X4 pffft_real_finalize_4x4
#define FUNC_REAL_FINALIZE pffft_real_finalize
#define FUNC_TRANSFORM_INTERNAL pffft_transform_internal
#define FUNC_COS cosf
#define FUNC_SIN sinf
#include "pffft_priv_impl.h"