[llvm] r228979 - X86: Don't crash if we can't decode the pshufb mask

[Chandler Carruth]

On Thu, Feb 12, 2015 at 3:26 PM, David Majnemer <david.majnemer at gmail.com>
wrote:

> Author: majnemer
> Date: Thu Feb 12 17:26:26 2015
> New Revision: 228979
>
> URL: http://llvm.org/viewvc/llvm-project?rev=228979&view=rev
> Log:
> X86: Don't crash if we can't decode the pshufb mask
>
> Constant pool entries are uniqued by their contents regardless of their
> type.  This means that a pshufb can have a shuffle mask which isn't a
> simple array of bytes.
>

While we clearly should not crash, it'd be nice to decode these constant
pool entries. Maybe leave a fixme or something so that at some point we
come back and add decoding support for weird entries?
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