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f416a52def
Groundwork for calling the decoders directly from C/C++ threads. To access the timer module timer_module must now be used. Instrumented code need only use the module function 'timer' which is now a procedure pointer that is guaranteed to be associated (unless null() is assigned to it, which should not be done). The default behaviour of 'timer' is to do nothing. If a Fortran program wishes to profile code it should now use the timer_impl module which contains a default timer implementation. The main program should call 'init_timer([filename])' before using 'timer' or calling routines that are instrumented. If 'init_timer([filename])'. If it is called then an optional file name may be provided with 'timer.out' being used as a default. The procedure 'fini_timer()' may be called to close the file. The default timer implementation is thread safe if used with OpenMP multi-threaded code so long as the OpenMP thread team is given the copyin(/timer_private/) attribute for correct operation. The common block /timer_private/ should be included for OpenMP use by including the file 'timer_common.inc'. The module 'lib/timer_C_wrapper.f90' provides a Fortran wrapper along with 'init' and 'fini' subroutines which allow a C/C++ application to call timer instrumented Fortran code and for it to receive callbacks of 'timer()' subroutine invocations. No C/C++ timer implementation is provided at this stage. git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6320 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
88 lines
2.2 KiB
Fortran
88 lines
2.2 KiB
Fortran
subroutine downsam9(id2,npts8,nsps8,newdat,nspsd,fpk,c2)
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!Downsample from id2() into c2() so as to yield nspsd samples per symbol,
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!mixing from fpk down to zero frequency. The downsample factor is 432.
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use, intrinsic :: iso_c_binding
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use FFTW3
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use timer_module, only: timer
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include 'constants.f90'
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integer(C_SIZE_T) NMAX1
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parameter (NMAX1=653184)
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parameter (NFFT1=653184,NFFT2=1512)
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type(C_PTR) :: plan !Pointers plan for big FFT
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integer*2 id2(0:8*npts8-1)
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real*4, pointer :: x1(:)
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complex c1(0:NFFT1/2)
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complex c2(0:NFFT2-1)
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real s(5000)
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logical first
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common/patience/npatience,nthreads
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data first/.true./
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save plan,first,c1,s,x1
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df1=12000.0/NFFT1
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npts=8*npts8
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if(npts.gt.NFFT1) npts=NFFT1 !### Fix! ###
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if(first) then
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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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! Plan the FFTs just once
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!$omp critical(fftw) ! serialize non thread-safe FFTW3 calls
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plan=fftwf_alloc_real(NMAX1)
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call c_f_pointer(plan,x1,[NMAX1])
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x1(0:NMAX1-1) => x1 !remap bounds
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call fftwf_plan_with_nthreads(nthreads)
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plan=fftwf_plan_dft_r2c_1d(NFFT1,x1,c1,nflags)
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call fftwf_plan_with_nthreads(1)
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!$omp end critical(fftw)
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first=.false.
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endif
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if(newdat.eq.1) then
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x1(0:npts-1)=id2(0:npts-1)
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x1(npts:NFFT1-1)=0. !Zero the rest of x1
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call timer('FFTbig9 ',0)
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call fftwf_execute_dft_r2c(plan,x1,c1)
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call timer('FFTbig9 ',1)
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nadd=int(1.0/df1)
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s=0.
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do i=1,5000
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j=int((i-1)/df1)
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do n=1,nadd
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j=j+1
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s(i)=s(i)+real(c1(j))**2 + aimag(c1(j))**2
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enddo
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enddo
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newdat=0
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endif
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ndown=8*nsps8/nspsd !Downsample factor = 432
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nh2=NFFT2/2
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nf=nint(fpk)
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i0=int(fpk/df1)
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nw=100
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ia=max(1,nf-nw)
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ib=min(5000,nf+nw)
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call pctile(s(ia),ib-ia+1,40,avenoise)
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fac=sqrt(1.0/avenoise)
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do i=0,NFFT2-1
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j=i0+i
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if(i.gt.nh2) j=j-NFFT2
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c2(i)=fac*c1(j)
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enddo
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call four2a(c2,NFFT2,1,1,1) !FFT back to time domain
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return
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end subroutine downsam9
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