[Discuss-gnuradio] Volk library invalid opcode exception

[Joanna Rutkowska]

Hello, I'm getting the invalid opcode exception whenever the volk
library is used from gr/grc. It is also easy to reproduce by executing
volk_profile:

address@hidden gnuradio]$ volk_profile
Using Volk machine: avx_64
RUN_VOLK_TESTS: volk_16ic_s32f_deinterleave_real_32f_a
Illegal instruction
address@hidden gnuradio]$ dmesg
[ 6920.211094] volk_profile[25627] trap invalid opcode ip:7f8145b74d40
sp:7fff41dfac78 error:0 in libvolk.so.0.0.0[7f8145ad7000+cf000]

I tried v3.5.2 and v3.5.2 build directly from git, using the building
script from here:

http://gnuradio.org/redmine/repositories/changes/gnuradio/README

Here's my cpuinfo:

address@hidden gnuradio]$ cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 42
model name      : Intel(R) Core(TM) i5-2540M CPU @ 2.60GHz
stepping        : 7
cpu MHz         : 2591.660
cache size      : 3072 KB
physical id     : 0
siblings        : 4
core id         : 1
cpu cores       : 1
apicid          : 3
initial apicid  : 3
fpu             : yes
fpu_exception   : yes
cpuid level     : 13
wp              : yes
flags           : fpu de tsc msr pae cx8 sep cmov pat clflush mmx fxsr sse sse2
ss ht syscall nx lm constant_tsc nopl aperfmperf pni pclmulqdq ssse3
cx16 sse4_1 sse4_2 x2apic popcnt aes hypervisor lahf_lm ida arat epb pln
pts dts
bogomips        : 5183.32
clflush size    : 64
cache_alignment : 64
address sizes   : 36 bits physical, 48 bits virtual
power management:

(and repeated 3x times for the other cores).

And, FWIW, this is the autoconfig snippet:

-- Configuring volk support...
--   Enabling volk support.
--   Override with -DENABLE_VOLK=ON/OFF
-- Boost version: 1.46.0
-- Found the following Boost libraries:
--   unit_test_framework
-- checking for module 'orc-0.4'
--   found orc-0.4, version 0.4.16
-- Found ORC: /usr/lib64/liborc-0.4.so
-- Check size of void*
-- Check size of void* - done
-- Performing Test have_maltivec
-- Performing Test have_maltivec - Failed
-- Performing Test have_mfpu=neon
-- Performing Test have_mfpu=neon - Failed
-- Performing Test have_mfloat-abi=softfp
-- Performing Test have_mfloat-abi=softfp - Failed
-- Performing Test have_funsafe-math-optimizations
-- Performing Test have_funsafe-math-optimizations - Success
-- 32 overruled
-- Performing Test have_m64
-- Performing Test have_m64 - Success
-- Performing Test have_m3dnow
-- Performing Test have_m3dnow - Success
-- Performing Test have_msse4.2
-- Performing Test have_msse4.2 - Success
-- Performing Test have_mpopcnt
-- Performing Test have_mpopcnt - Success
-- Performing Test have_mmmx
-- Performing Test have_mmmx - Success
-- Performing Test have_msse
-- Performing Test have_msse - Success
-- Performing Test have_msse2
-- Performing Test have_msse2 - Success
-- Performing Test have_lorc-0.4
-- Performing Test have_lorc-0.4 - Success
-- Performing Test have_msse3
-- Performing Test have_msse3 - Success
-- Performing Test have_mssse3
-- Performing Test have_mssse3 - Success
-- Performing Test have_msse4a
-- Performing Test have_msse4a - Success
-- Performing Test have_msse4.1
-- Performing Test have_msse4.1 - Success
-- Performing Test have_mavx
-- Performing Test have_mavx - Success
-- Available arches:
generic;64;3dnow;abm;popcount;mmx;sse;sse2;orc;sse3;ssse3;sse4_a;sse4_1;sse4_2;avx
-- Available machines:
generic;sse2_only;sse2_64;sse3_64;ssse3_64;sse4_a_64;sse4_1_64;sse4_2_64;avx_64;avx_only
-- Using install prefix: /usr/local
-- Found Doxygen: /usr/bin/doxygen

One more thing to note that I'm running in a Xen PV VM, although this
should not matter, as the usermode instructions execute directly on the
CPU in this mode.

Thanks,
joanna.

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