Public bug reported:
libfftw3-dev:
Installed: (none)
Candidate: 3.3.8-2ubuntu8
Version table:
3.3.8-2ubuntu8 500
500 http://archive.ubuntu.com/ubuntu jammy/main amd64 Packages
program to reproduce bug on Ubuntu 20.04 or 22.04 follows below
expected: success (no assert) because the input was preserved
observed: assert because the input was not preserved
```test_fftw_preserve.cc
#include <fftw3.h>
#include <vector>
#include <complex>
#include "assert.h"
int main()
{
typedef std::complex<float> cpx;
int nfft = 125;
fftwf_plan plan = fftwf_plan_many_dft(1,&nfft,1,
NULL, NULL,1,nfft,
NULL, NULL,1,nfft,
FFTW_FORWARD,
FFTW_ESTIMATE|FFTW_PRESERVE_INPUT|FFTW_UNALIGNED);
std::vector<cpx> in(nfft,cpx(1,2));
std::vector<cpx> in_copied(in);
std::vector<cpx> out(nfft);
fftwf_execute_dft(plan,
reinterpret_cast<fftwf_complex*>(in.data()),reinterpret_cast<fftwf_complex*>(out.data()));
assert(in == in_copied);
fftwf_destroy_plan(plan);
return 0;
}
```
To run:
```
$ g++ test_fftw_preserve.cc -lfftw3f && ./a.out
a.out: test_fftw_preserve.cc:21: int main(): Assertion `in == in_copied' failed.
Aborted (core dumped)
```
** Affects: fftw3 (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "reproduction example"
https://bugs.launchpad.net/bugs/1978640/+attachment/5597250/+files/test_fftw_preserve.cc
--
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https://bugs.launchpad.net/bugs/1978640
Title:
FFTW_PRESERVE_INPUT does not always preserve input
Status in fftw3 package in Ubuntu:
New
Bug description:
libfftw3-dev:
Installed: (none)
Candidate: 3.3.8-2ubuntu8
Version table:
3.3.8-2ubuntu8 500
500 http://archive.ubuntu.com/ubuntu jammy/main amd64 Packages
program to reproduce bug on Ubuntu 20.04 or 22.04 follows below
expected: success (no assert) because the input was preserved
observed: assert because the input was not preserved
```test_fftw_preserve.cc
#include <fftw3.h>
#include <vector>
#include <complex>
#include "assert.h"
int main()
{
typedef std::complex<float> cpx;
int nfft = 125;
fftwf_plan plan = fftwf_plan_many_dft(1,&nfft,1,
NULL, NULL,1,nfft,
NULL, NULL,1,nfft,
FFTW_FORWARD,
FFTW_ESTIMATE|FFTW_PRESERVE_INPUT|FFTW_UNALIGNED);
std::vector<cpx> in(nfft,cpx(1,2));
std::vector<cpx> in_copied(in);
std::vector<cpx> out(nfft);
fftwf_execute_dft(plan,
reinterpret_cast<fftwf_complex*>(in.data()),reinterpret_cast<fftwf_complex*>(out.data()));
assert(in == in_copied);
fftwf_destroy_plan(plan);
return 0;
}
```
To run:
```
$ g++ test_fftw_preserve.cc -lfftw3f && ./a.out
a.out: test_fftw_preserve.cc:21: int main(): Assertion `in == in_copied'
failed.
Aborted (core dumped)
```
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https://bugs.launchpad.net/ubuntu/+source/fftw3/+bug/1978640/+subscriptions
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