On Fri, Mar 16, 2012 at 3:03 PM, Frederick Stevens
<address@hidden> wrote:
Here is the gcc info. It will take me a bit to re compile gnuradio
but I will turn on debugging in cmake.
gcc (GCC) 4.5.2
Copyright (C) 2010 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There
is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.
I am running kernel 3.2.7 from slackware-current and swig 2.0.4
everything else is from slackbuilds. I will have to get versions
for you if you need them.
Cheers,
Fred
While you're doing the rebuild, can you set the optimization flag to -O2? It's -O3 right now by default, and every now and then it can be a problem (haven't heard of one in a while, but it's been a thing).
It should be setting '-DCMAKE_CXXFLAGS="-O2"'.
Tom
On 03/16/2012 01:50 PM, Nick Foster wrote:
On Fri, Mar 16, 2012 at 11:42 AM,
Frederick Stevens
<address@hidden>
wrote:
Rafael,
Here is the output from gdb:
RUN_VOLK_TESTS: volk_32fc_32f_multiply_32fc_a
Program received signal SIGSEGV, Segmentation fault.
0xb7f2c6e0 in volk_32fc_32f_multiply_32fc_a_generic ()
from /home/fred/extras/gnuradio/gnuradio/build/volk/lib/libvolk.so.0.0.0
Dump of assembler code for function
volk_32fc_32f_multiply_32fc_a_generic:
0xb7f2c6c0 <+0>: push %ebp
0xb7f2c6c1 <+1>: mov %esp,%ebp
0xb7f2c6c3 <+3>: push %edi
0xb7f2c6c4 <+4>: push %esi
0xb7f2c6c5 <+5>: mov 0x8(%ebp),%edx
0xb7f2c6c8 <+8>: mov 0xc(%ebp),%ecx
0xb7f2c6cb <+11>: mov 0x10(%ebp),%edi
0xb7f2c6ce <+14>: mov 0x14(%ebp),%esi
0xb7f2c6d1 <+17>: test %esi,%esi
0xb7f2c6d3 <+19>: je 0xb7f2c6fc
<volk_32fc_32f_multiply_32fc_a_generic+60>
0xb7f2c6d5 <+21>: xor %eax,%eax
0xb7f2c6d7 <+23>: mov %esi,%esi
0xb7f2c6d9 <+25>: lea 0x0(%edi,%eiz,1),%edi
=> 0xb7f2c6e0 <+32>: flds (%edi,%eax,8)
0xb7f2c6e3 <+35>: flds (%ecx,%eax,8)
0xb7f2c6e6 <+38>: fmul %st(1),%st
0xb7f2c6e8 <+40>: fxch %st(1)
0xb7f2c6ea <+42>: fmuls 0x4(%ecx,%eax,8)
0xb7f2c6ee <+46>: fxch %st(1)
0xb7f2c6f0 <+48>: fstps (%edx,%eax,8)
0xb7f2c6f3 <+51>: fstps 0x4(%edx,%eax,8)
0xb7f2c6f7 <+55>: inc %eax
0xb7f2c6f8 <+56>: cmp %eax,%esi
0xb7f2c6fa <+58>: ja 0xb7f2c6e0
<volk_32fc_32f_multiply_32fc_a_generic+32>
0xb7f2c6fc <+60>: pop %esi
0xb7f2c6fd <+61>: pop %edi
0xb7f2c6fe <+62>: pop %ebp
0xb7f2c6ff <+63>: ret
End of assembler dump.
I omitted the first part of the program execution since
everything seemed to be working fine. Hope this helps. Let
me know if you would like me to try something else.
Cheers,
Fred
OK, that's weird as hell. That's the generic
implementation, which is just a std::complex multiply in a for
loop. Can you give me your gcc version?
--n
On 03/16/2012 12:39 PM, Rafael Diniz wrote:
Also using the gdb "disassemble" command you could trace
which instruction
raised the fault.
Cheers,
Rafael Diniz
Well, that doesn't make me happy at all. Especially
since we just patched
the release yesterday...
Sounds like the AMD chip is handling something wrong
(or differently) with
the alignment. All vectors passed using volk_profile
are supposed to be
properly byte aligned.
Fred, can you just check for me what happens when you
run it under gdb?
Just run "gdb volk_profile" and when it crashes, do a
"bt" and post the
results of the backtrace here.
Thanks,
Tom
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