* Aurelien Jarno:

>> vex amd64->IR: unhandled instruction bytes: 0x66 0x66 0x66 0x66

> This is very probably the reason 2. as programs are running correctly
> without valgrind.

Yeah, as long as the total instruction length remains below 14 bytes
or so, multiple opcode prefixes such as 0x66 are allowed.  On some
processors, this is actually a good way to encode NOPs.


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