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replace fftw with pffft
This commit is contained in:
Pavel Demin
parent
071d85029e
commit
9bf5d0b233
2
Makefile
2
Makefile
@ -1,7 +1,7 @@
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TARGET = ft8d
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OBJECTS = \
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crc14.o crc.o ft8_downsample.o sync8d.o sync8.o grid2deg.o fftw3mod.o \
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crc14.o crc.o ft8_downsample.o sync8d.o sync8.o grid2deg.o pffft.o \
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four2a.o deg2grid.o determ.o baseline.o platanh.o bpdecode174_91.o \
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fmtmsg.o packjt.o chkcrc14a.o indexx.o shell.o pctile.o polyfit.o \
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twkfreq1.o osd174_91.o encode174_91.o chkcall.o packjt77.o genft8.o \
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64
fftw3.f90
64
fftw3.f90
@ -1,64 +0,0 @@
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INTEGER FFTW_R2HC
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PARAMETER (FFTW_R2HC=0)
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INTEGER FFTW_HC2R
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PARAMETER (FFTW_HC2R=1)
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INTEGER FFTW_DHT
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PARAMETER (FFTW_DHT=2)
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INTEGER FFTW_REDFT00
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PARAMETER (FFTW_REDFT00=3)
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INTEGER FFTW_REDFT01
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PARAMETER (FFTW_REDFT01=4)
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INTEGER FFTW_REDFT10
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PARAMETER (FFTW_REDFT10=5)
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INTEGER FFTW_REDFT11
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PARAMETER (FFTW_REDFT11=6)
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INTEGER FFTW_RODFT00
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PARAMETER (FFTW_RODFT00=7)
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INTEGER FFTW_RODFT01
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PARAMETER (FFTW_RODFT01=8)
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INTEGER FFTW_RODFT10
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PARAMETER (FFTW_RODFT10=9)
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INTEGER FFTW_RODFT11
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PARAMETER (FFTW_RODFT11=10)
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INTEGER FFTW_FORWARD
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PARAMETER (FFTW_FORWARD=-1)
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INTEGER FFTW_BACKWARD
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PARAMETER (FFTW_BACKWARD=+1)
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INTEGER FFTW_MEASURE
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PARAMETER (FFTW_MEASURE=0)
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INTEGER FFTW_DESTROY_INPUT
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PARAMETER (FFTW_DESTROY_INPUT=1)
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INTEGER FFTW_UNALIGNED
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PARAMETER (FFTW_UNALIGNED=2)
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INTEGER FFTW_CONSERVE_MEMORY
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PARAMETER (FFTW_CONSERVE_MEMORY=4)
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INTEGER FFTW_EXHAUSTIVE
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PARAMETER (FFTW_EXHAUSTIVE=8)
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INTEGER FFTW_PRESERVE_INPUT
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PARAMETER (FFTW_PRESERVE_INPUT=16)
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INTEGER FFTW_PATIENT
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PARAMETER (FFTW_PATIENT=32)
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INTEGER FFTW_ESTIMATE
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PARAMETER (FFTW_ESTIMATE=64)
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INTEGER FFTW_ESTIMATE_PATIENT
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PARAMETER (FFTW_ESTIMATE_PATIENT=128)
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INTEGER FFTW_BELIEVE_PCOST
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PARAMETER (FFTW_BELIEVE_PCOST=256)
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INTEGER FFTW_DFT_R2HC_ICKY
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PARAMETER (FFTW_DFT_R2HC_ICKY=512)
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INTEGER FFTW_NONTHREADED_ICKY
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PARAMETER (FFTW_NONTHREADED_ICKY=1024)
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INTEGER FFTW_NO_BUFFERING
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PARAMETER (FFTW_NO_BUFFERING=2048)
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INTEGER FFTW_NO_INDIRECT_OP
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PARAMETER (FFTW_NO_INDIRECT_OP=4096)
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INTEGER FFTW_ALLOW_LARGE_GENERIC
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PARAMETER (FFTW_ALLOW_LARGE_GENERIC=8192)
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INTEGER FFTW_NO_RANK_SPLITS
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PARAMETER (FFTW_NO_RANK_SPLITS=16384)
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INTEGER FFTW_NO_VRANK_SPLITS
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PARAMETER (FFTW_NO_VRANK_SPLITS=32768)
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INTEGER FFTW_NO_VRECURSE
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PARAMETER (FFTW_NO_VRECURSE=65536)
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INTEGER FFTW_NO_SIMD
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PARAMETER (FFTW_NO_SIMD=131072)
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@ -1,4 +0,0 @@
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module FFTW3
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use, intrinsic :: iso_c_binding
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include 'fftw3.f03'
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end module FFTW3
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40
four2a.c
Normal file
40
four2a.c
Normal file
@ -0,0 +1,40 @@
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#include "pffft.h"
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static struct
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{
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PFFFT_Setup *s;
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int n;
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} setups[10];
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static int size;
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void four2a_(float *a, int *nfft, int *ndim, int *sign, int *form)
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{
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int i;
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PFFFT_Setup *s;
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pffft_direction_t direction;
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s = NULL;
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for(i = 0; i < size; ++i)
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{
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if(setups[i].n == *nfft)
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{
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s = setups[i].s;
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break;
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}
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}
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if(s == NULL && size < 10)
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{
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s = pffft_new_setup(*nfft, PFFFT_COMPLEX);
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setups[size].s = s;
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setups[size].n = *nfft;
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++size;
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}
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if(s != NULL)
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{
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direction = *sign == 1 ? PFFFT_BACKWARD : PFFFT_FORWARD;
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pffft_transform_ordered(s, a, a, NULL, direction);
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}
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}
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115
four2a.f90
115
four2a.f90
@ -1,115 +0,0 @@
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subroutine four2a(a,nfft,ndim,isign,iform)
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! IFORM = 1, 0 or -1, as data is
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! complex, real, or the first half of a complex array. Transform
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! values are returned in array DATA. They are complex, real, or
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! the first half of a complex array, as IFORM = 1, -1 or 0.
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! The transform of a real array (IFORM = 0) dimensioned N(1) by N(2)
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! by ... will be returned in the same array, now considered to
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! be complex of dimensions N(1)/2+1 by N(2) by .... Note that if
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! IFORM = 0 or -1, N(1) must be even, and enough room must be
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! reserved. The missing values may be obtained by complex conjugation.
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! The reverse transformation of a half complex array dimensioned
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! N(1)/2+1 by N(2) by ..., is accomplished by setting IFORM
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! to -1. In the N array, N(1) must be the true N(1), not N(1)/2+1.
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! The transform will be real and returned to the input array.
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! This version of four2a makes calls to the FFTW library to do the
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! actual computations.
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use fftw3
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parameter (NPMAX=2100) !Max numberf of stored plans
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parameter (NSMALL=16384) !Max size of "small" FFTs
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complex a(nfft) !Array to be transformed
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complex aa(NSMALL) !Local copy of "small" a()
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integer nn(NPMAX),ns(NPMAX),nf(NPMAX) !Params of stored plans
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integer*8 nl(NPMAX),nloc !More params of plans
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integer*8 plan(NPMAX) !Pointers to stored plans
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logical found_plan
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data nplan/0/ !Number of stored plans
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common/patience/npatience,nthreads !Patience and threads for FFTW plans
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save plan,nplan,nn,ns,nf,nl
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if(nfft.lt.0) go to 999
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nloc=loc(a)
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found_plan = .false.
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!$omp critical(four2a_setup)
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do i=1,nplan
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if(nfft.eq.nn(i) .and. isign.eq.ns(i) .and. &
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iform.eq.nf(i) .and. nloc.eq.nl(i)) then
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found_plan = .true.
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exit
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end if
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enddo
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if(i.ge.NPMAX) stop 'Too many FFTW plans requested.'
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if (.not. found_plan) then
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nplan=nplan+1
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i=nplan
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nn(i)=nfft
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ns(i)=isign
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nf(i)=iform
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nl(i)=nloc
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! Planning: FFTW_ESTIMATE, FFTW_ESTIMATE_PATIENT, FFTW_MEASURE,
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! FFTW_PATIENT, FFTW_EXHAUSTIVE
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nflags=FFTW_ESTIMATE
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if(npatience.eq.1) nflags=FFTW_ESTIMATE_PATIENT
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if(npatience.eq.2) nflags=FFTW_MEASURE
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if(npatience.eq.3) nflags=FFTW_PATIENT
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if(npatience.eq.4) nflags=FFTW_EXHAUSTIVE
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if(nfft.le.NSMALL) then
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jz=nfft
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if(iform.eq.0) jz=nfft/2
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aa(1:jz)=a(1:jz)
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endif
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!$omp critical(fftw) ! serialize non thread-safe FFTW3 calls
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if(isign.eq.-1 .and. iform.eq.1) then
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call sfftw_plan_dft_1d(plan(i),nfft,a,a,FFTW_FORWARD,nflags)
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else if(isign.eq.1 .and. iform.eq.1) then
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call sfftw_plan_dft_1d(plan(i),nfft,a,a,FFTW_BACKWARD,nflags)
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else if(isign.eq.-1 .and. iform.eq.0) then
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call sfftw_plan_dft_r2c_1d(plan(i),nfft,a,a,nflags)
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else if(isign.eq.1 .and. iform.eq.-1) then
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call sfftw_plan_dft_c2r_1d(plan(i),nfft,a,a,nflags)
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else
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stop 'Unsupported request in four2a'
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endif
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!$omp end critical(fftw)
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if(nfft.le.NSMALL) then
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jz=nfft
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if(iform.eq.0) jz=nfft/2
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a(1:jz)=aa(1:jz)
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endif
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end if
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!$omp end critical(four2a_setup)
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call sfftw_execute(plan(i))
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return
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999 continue
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!$omp critical(four2a)
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do i=1,nplan
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! The test is only to silence a compiler warning:
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if(ndim.ne.-999) then
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!$omp critical(fftw) ! serialize non thread-safe FFTW3 calls
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call sfftw_destroy_plan(plan(i))
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!$omp end critical(fftw)
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end if
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enddo
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call fftwf_cleanup()
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nplan=0
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!$omp end critical(four2a)
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return
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end subroutine four2a
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177
pffft.h
Normal file
177
pffft.h
Normal file
@ -0,0 +1,177 @@
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/* Copyright (c) 2013 Julien Pommier ( pommier@modartt.com )
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Based on original fortran 77 code from FFTPACKv4 from NETLIB,
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authored by Dr Paul Swarztrauber of NCAR, in 1985.
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As confirmed by the NCAR fftpack software curators, the following
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FFTPACKv5 license applies to FFTPACKv4 sources. My changes are
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released under the same terms.
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FFTPACK license:
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http://www.cisl.ucar.edu/css/software/fftpack5/ftpk.html
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Copyright (c) 2004 the University Corporation for Atmospheric
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Research ("UCAR"). All rights reserved. Developed by NCAR's
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Computational and Information Systems Laboratory, UCAR,
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www.cisl.ucar.edu.
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Redistribution and use of the Software in source and binary forms,
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with or without modification, is permitted provided that the
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following conditions are met:
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- Neither the names of NCAR's Computational and Information Systems
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Laboratory, the University Corporation for Atmospheric Research,
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nor the names of its sponsors or contributors may be used to
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endorse or promote products derived from this Software without
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specific prior written permission.
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- Redistributions of source code must retain the above copyright
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notices, this list of conditions, and the disclaimer below.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions, and the disclaimer below in the
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documentation and/or other materials provided with the
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distribution.
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THIS SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE CONTRIBUTORS OR COPYRIGHT
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HOLDERS BE LIABLE FOR ANY CLAIM, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE
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SOFTWARE.
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*/
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/*
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PFFFT : a Pretty Fast FFT.
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This is basically an adaptation of the single precision fftpack
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(v4) as found on netlib taking advantage of SIMD instruction found
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on cpus such as intel x86 (SSE1), powerpc (Altivec), and arm (NEON).
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For architectures where no SIMD instruction is available, the code
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falls back to a scalar version.
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Restrictions:
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- 1D transforms only, with 32-bit single precision.
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- supports only transforms for inputs of length N of the form
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N=(2^a)*(3^b)*(5^c), a >= 5, b >=0, c >= 0 (32, 48, 64, 96, 128,
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144, 160, etc are all acceptable lengths). Performance is best for
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128<=N<=8192.
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- all (float*) pointers in the functions below are expected to
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have an "simd-compatible" alignment, that is 16 bytes on x86 and
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powerpc CPUs.
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You can allocate such buffers with the functions
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pffft_aligned_malloc / pffft_aligned_free (or with stuff like
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posix_memalign..)
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*/
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#ifndef PFFFT_H
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#define PFFFT_H
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#include <stddef.h> // for size_t
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* opaque struct holding internal stuff (precomputed twiddle factors)
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this struct can be shared by many threads as it contains only
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read-only data.
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*/
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typedef struct PFFFT_Setup PFFFT_Setup;
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/* direction of the transform */
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typedef enum { PFFFT_FORWARD, PFFFT_BACKWARD } pffft_direction_t;
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/* type of transform */
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typedef enum { PFFFT_REAL, PFFFT_COMPLEX } pffft_transform_t;
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/*
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prepare for performing transforms of size N -- the returned
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PFFFT_Setup structure is read-only so it can safely be shared by
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multiple concurrent threads.
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*/
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PFFFT_Setup *pffft_new_setup(int N, pffft_transform_t transform);
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void pffft_destroy_setup(PFFFT_Setup *);
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/*
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Perform a Fourier transform , The z-domain data is stored in the
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most efficient order for transforming it back, or using it for
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convolution. If you need to have its content sorted in the
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"usual" way, that is as an array of interleaved complex numbers,
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either use pffft_transform_ordered , or call pffft_zreorder after
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the forward fft, and before the backward fft.
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Transforms are not scaled: PFFFT_BACKWARD(PFFFT_FORWARD(x)) = N*x.
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Typically you will want to scale the backward transform by 1/N.
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The 'work' pointer should point to an area of N (2*N for complex
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fft) floats, properly aligned. If 'work' is NULL, then stack will
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be used instead (this is probably the best strategy for small
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FFTs, say for N < 16384).
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input and output may alias.
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*/
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void pffft_transform(PFFFT_Setup *setup, const float *input, float *output, float *work, pffft_direction_t direction);
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/*
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Similar to pffft_transform, but makes sure that the output is
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ordered as expected (interleaved complex numbers). This is
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similar to calling pffft_transform and then pffft_zreorder.
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input and output may alias.
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*/
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void pffft_transform_ordered(PFFFT_Setup *setup, const float *input, float *output, float *work, pffft_direction_t direction);
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/*
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call pffft_zreorder(.., PFFFT_FORWARD) after pffft_transform(...,
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PFFFT_FORWARD) if you want to have the frequency components in
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the correct "canonical" order, as interleaved complex numbers.
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(for real transforms, both 0-frequency and half frequency
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components, which are real, are assembled in the first entry as
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F(0)+i*F(n/2+1). Note that the original fftpack did place
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F(n/2+1) at the end of the arrays).
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input and output should not alias.
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*/
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void pffft_zreorder(PFFFT_Setup *setup, const float *input, float *output, pffft_direction_t direction);
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/*
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Perform a multiplication of the frequency components of dft_a and
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dft_b and accumulate them into dft_ab. The arrays should have
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been obtained with pffft_transform(.., PFFFT_FORWARD) and should
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*not* have been reordered with pffft_zreorder (otherwise just
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perform the operation yourself as the dft coefs are stored as
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interleaved complex numbers).
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the operation performed is: dft_ab += (dft_a * fdt_b)*scaling
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The dft_a, dft_b and dft_ab pointers may alias.
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*/
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void pffft_zconvolve_accumulate(PFFFT_Setup *setup, const float *dft_a, const float *dft_b, float *dft_ab, float scaling);
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/*
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the float buffers must have the correct alignment (16-byte boundary
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on intel and powerpc). This function may be used to obtain such
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correctly aligned buffers.
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*/
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void *pffft_aligned_malloc(size_t nb_bytes);
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void pffft_aligned_free(void *);
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/* return 4 or 1 wether support SSE/Altivec instructions was enable when building pffft.c */
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int pffft_simd_size();
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#ifdef __cplusplus
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}
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#endif
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#endif // PFFFT_H
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