$ valgrind ./cryptest.exe v
==30929== Memcheck, a memory error detector
==30929== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==30929== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info
==30929== Command: ./cryptest.exe v
==30929==
vex x86->IR: unhandled instruction bytes: 0xC4 0xE2 0x7B 0xF7
==30929== valgrind: Unrecognised instruction at address 0x811c731.
==30929==    at 0x811C731: CryptoPP::Rijndael::Base::UncheckedSetKey(unsigned char const*, unsigned int, CryptoPP::NameValuePairs const&) (rijndael.cpp:209)
==30929==    by 0x808977D: CryptoPP::ModePolicyCommonTemplate<CryptoPP::AdditiveCipherAbstractPolicy>::CipherSetKey(CryptoPP::NameValuePairs const&, unsigned char const*, unsigned int) (modes.h:98)
==30929==    by 0x8193DA5: CryptoPP::AdditiveCipherTemplate<CryptoPP::AbstractPolicyHolder<CryptoPP::AdditiveCipherAbstractPolicy, CryptoPP::OFB_ModePolicy> >::UncheckedSetKey(unsigned char const*, unsigned int, CryptoPP::NameValuePairs const&) (strciphr.cpp:15)
==30929==    by 0x80EFAEF: CryptoPP::SimpleKeyingInterface::SetKeyWithIV(unsigned char const*, unsigned int, unsigned char const*, unsigned int) (cryptlib.cpp:113)
==30929==    by 0x804B957: SetKeyWithIV (cryptlib.h:573)
==30929==    by 0x804B957: main (test.cpp:143)
==30929== Your program just tried to execute an instruction that Valgrind
==30929== did not recognise.  There are two possible reasons for this.
==30929== 1. Your program has a bug and erroneously jumped to a non-code
==30929==    location.  If you are running Memcheck and you just saw a
==30929==    warning about a bad jump, it's probably your program's fault.
==30929== 2. The instruction is legitimate but Valgrind doesn't handle it,
==30929==    i.e. it's Valgrind's fault.  If you think this is the case or
==30929==    you are not sure, please let us know and we'll try to fix it.
==30929== Either way, Valgrind will now raise a SIGILL signal which will
==30929== probably kill your program.
==30929==
==30929== Process terminating with default action of signal 4 (SIGILL)
==30929==  Illegal opcode at address 0x811C731
==30929==    at 0x811C731: CryptoPP::Rijndael::Base::UncheckedSetKey(unsigned char const*, unsigned int, CryptoPP::NameValuePairs const&) (rijndael.cpp:209)
==30929==    by 0x808977D: CryptoPP::ModePolicyCommonTemplate<CryptoPP::AdditiveCipherAbstractPolicy>::CipherSetKey(CryptoPP::NameValuePairs const&, unsigned char const*, unsigned int) (modes.h:98)
==30929==    by 0x8193DA5: CryptoPP::AdditiveCipherTemplate<CryptoPP::AbstractPolicyHolder<CryptoPP::AdditiveCipherAbstractPolicy, CryptoPP::OFB_ModePolicy> >::UncheckedSetKey(unsigned char const*, unsigned int, CryptoPP::NameValuePairs const&) (strciphr.cpp:15)
==30929==    by 0x80EFAEF: CryptoPP::SimpleKeyingInterface::SetKeyWithIV(unsigned char const*, unsigned int, unsigned char const*, unsigned int) (cryptlib.cpp:113)
==30929==    by 0x804B957: SetKeyWithIV (cryptlib.h:573)
==30929==    by 0x804B957: main (test.cpp:143)
==30929==
==30929== HEAP SUMMARY:
==30929==     in use at exit: 8,907 bytes in 466 blocks
==30929==   total heap usage: 655 allocs, 189 frees, 12,746 bytes allocated
==30929==
==30929== LEAK SUMMARY:
==30929==    definitely lost: 0 bytes in 0 blocks
==30929==    indirectly lost: 0 bytes in 0 blocks
==30929==      possibly lost: 0 bytes in 0 blocks
==30929==    still reachable: 8,907 bytes in 466 blocks
==30929==                       of which reachable via heuristic:
==30929==                         stdstring          : 4,071 bytes in 158 blocks
==30929==         suppressed: 0 bytes in 0 blocks
==30929== Rerun with --leak-check=full to see details of leaked memory
==30929==
==30929== For counts of detected and suppressed errors, rerun with: -v
==30929== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
Illegal instruction


$ gdb ./cryptest.exe
GNU gdb (Debian 7.7.1+dfsg-5) 7.7.1
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i586-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from ./cryptest.exe...done.
(gdb) disass /r 0x811c731
Dump of assembler code for function CryptoPP::Rijndael::Base::UncheckedSetKey(unsigned char const*, unsigned int, CryptoPP::NameValuePairs const&):
   0x0811c720 <+0>:	55	push   %ebp
   0x0811c721 <+1>:	b8 02 00 00 00	mov    $0x2,%eax
   0x0811c726 <+6>:	89 e5	mov    %esp,%ebp
   0x0811c728 <+8>:	57	push   %edi
   0x0811c729 <+9>:	56	push   %esi
   0x0811c72a <+10>:	53	push   %ebx
   0x0811c72b <+11>:	83 ec 4c	sub    $0x4c,%esp
   0x0811c72e <+14>:	8b 4d 08	mov    0x8(%ebp),%ecx
   0x0811c731 <+17>:	c4 e2 7b f7 45 10	shrx   %eax,0x10(%ebp),%eax
   0x0811c737 <+23>:	8b 75 08	mov    0x8(%ebp),%esi
   0x0811c73a <+26>:	8d 50 06	lea    0x6(%eax),%edx
   0x0811c73d <+29>:	83 c0 07	add    $0x7,%eax
   0x0811c740 <+32>:	8d 59 10	lea    0x10(%ecx),%ebx
   0x0811c743 <+35>:	8b b9 10 01 00 00	mov    0x110(%ecx),%edi
   0x0811c749 <+41>:	89 56 08	mov    %edx,0x8(%esi)
   0x0811c74c <+44>:	8b 91 14 01 00 00	mov    0x114(%ecx),%edx
   0x0811c752 <+50>:	89 d9	mov    %ebx,%ecx
   0x0811c754 <+52>:	8d 34 85 00 00 00 00	lea    0x0(,%eax,4),%esi
   0x0811c75b <+59>:	f7 d9	neg    %ecx
   0x0811c75d <+61>:	83 e1 0f	and    $0xf,%ecx
   0x0811c760 <+64>:	89 75 d4	mov    %esi,-0x2c(%ebp)
---Type <return> to continue, or q <return> to quit---