Your message dated Sun, 23 Nov 2014 21:19:51 +0000
with message-id <e1xsezt-0000q1...@franck.debian.org>
and subject line Bug#767138: fixed in fftw3 3.3.4-2
has caused the Debian Bug report #767138,
regarding fftw3: runtime detection of NEON is perhaps broken
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
(NB: If you are a system administrator and have no idea what this
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immediately.)
--
767138: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=767138
Debian Bug Tracking System
Contact ow...@bugs.debian.org with problems
--- Begin Message ---
Source: fftw3
Version: 3.3.4-1.1
In simd-support/neon.c I found:
static int really_have_neon(void)
{
void (*oldsig)(int);
oldsig = signal(SIGILL, sighandler);
if (setjmp(jb)) {
signal(SIGILL, oldsig);
return 0;
} else {
/* paranoia: encode the instruction in binary because the
assembler may not recognize it without -mfpu=neon */
/*asm volatile ("vand q0, q0, q0");*/
asm volatile (".long 0xf2000150");
signal(SIGILL, oldsig);
return 1;
}
}
Of course, that binary encoding of the VAND instruction is only valid
for ARM mode, not Thumb, and the library is mostly compiled for Thumb,
I think.
In fact, I think I have tracked down where this code appears in the
binary. In libfftw3f.so.3.4.4 I found:
a9f84: 490f ldr r1, [pc, #60] ; (a9fc4
<fftwf_guru64_kosherp+0xa4>)
a9f86: 2004 movs r0, #4
a9f88: b500 push {lr}
a9f8a: 4479 add r1, pc
a9f8c: b083 sub sp, #12
a9f8e: f765 ed0c blx f9a8 <_init+0x33c>
a9f92: 9001 str r0, [sp, #4]
a9f94: 480c ldr r0, [pc, #48] ; (a9fc8
<fftwf_guru64_kosherp+0xa8>)
a9f96: 4478 add r0, pc
a9f98: f765 ec66 blx f868 <_init+0x1fc>
a9f9c: b948 cbnz r0, a9fb2 <fftwf_guru64_kosherp+0x92>
! a9f9e: 0150 lsls r0, r2, #5
! a9fa0: f200 2004 addw r0, r0, #516 ; 0x204
a9fa4: 9901 ldr r1, [sp, #4]
a9fa6: f765 ed00 blx f9a8 <_init+0x33c>
a9faa: 2001 movs r0, #1
a9fac: b003 add sp, #12
a9fae: f85d fb04 ldr.w pc, [sp], #4
a9fb2: 9901 ldr r1, [sp, #4]
a9fb4: 2004 movs r0, #4
a9fb6: f765 ecf8 blx f9a8 <_init+0x33c>
a9fba: 2000 movs r0, #0
a9fbc: b003 add sp, #12
a9fbe: f85d fb04 ldr.w pc, [sp], #4
This may explain some problems that people have experienced with
libfftw3:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=752514
http://lists.debian.org/debian-arm/2014/10/msg00051.html
Is this signal-handling approach the best way of detecting NEON? The
following blog suggests using HWCAP, but I don't know if that would
work with the freebsd kernels:
http://community.arm.com/groups/android-community/blog/2014/10/10/runtime-detection-of-cpu-features-on-an-armv8-a-cpu
--- End Message ---
--- Begin Message ---
Source: fftw3
Source-Version: 3.3.4-2
We believe that the bug you reported is fixed in the latest version of
fftw3, which is due to be installed in the Debian FTP archive.
A summary of the changes between this version and the previous one is
attached.
Thank you for reporting the bug, which will now be closed. If you
have further comments please address them to 767...@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.
Debian distribution maintenance software
pp.
Sébastien Villemot <sebast...@debian.org> (supplier of updated fftw3 package)
(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmas...@ftp-master.debian.org)
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Format: 1.8
Date: Sun, 23 Nov 2014 20:49:59 +0100
Source: fftw3
Binary: libfftw3-3 libfftw3-single3 libfftw3-double3 libfftw3-long3
libfftw3-quad3 libfftw3-bin libfftw3-mpi3 libfftw3-dev libfftw3-mpi-dev
libfftw3-doc libfftw3-dbg
Architecture: source all armhf
Version: 3.3.4-2
Distribution: unstable
Urgency: medium
Maintainer: Debian Science Team
<debian-science-maintainers@lists.alioth.debian.org>
Changed-By: Sébastien Villemot <sebast...@debian.org>
Description:
libfftw3-3 - Library for computing Fast Fourier Transforms
libfftw3-bin - Library for computing Fast Fourier Transforms - Tools
libfftw3-dbg - Library for computing Fast Fourier Transforms - debug symbols
libfftw3-dev - Library for computing Fast Fourier Transforms - development
libfftw3-doc - Documentation for fftw version 3
libfftw3-double3 - Library for computing Fast Fourier Transforms - Double
precision
libfftw3-long3 - Library for computing Fast Fourier Transforms - Long precision
libfftw3-mpi-dev - MPI Library for computing Fast Fourier Transforms -
development
libfftw3-mpi3 - MPI Library for computing Fast Fourier Transforms
libfftw3-quad3 - Library for computing Fast Fourier Transforms - Quad precision
libfftw3-single3 - Library for computing Fast Fourier Transforms - Single
precision
Closes: 767138
Changes:
fftw3 (3.3.4-2) unstable; urgency=medium
.
* Team upload.
* fix-runtime-neon-detection.patch: new patch, fixes runtime NEON
detection on armhf (and also arm64, but NEON is currently
unconditionnally disabled there). Thanks to Edmund Grimley Evans for
the patch. (Closes: #767138)
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libfftw3-doc_3.3.4-2_all.deb
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libfftw3-mpi-dev_3.3.4-2_armhf.deb
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--- End Message ---
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