SSE/x86_64 fix

[Alan Modra]

On Fri, 5 Jan 2001, Alan Modra wrote:

> On Thu, 4 Jan 2001, Jan Hubicka wrote:
> 
> > +	/* All opcodes on i386 have eighter 1 or 2 bytes.  We may use third
> > +	   byte for the SSE instructions to specify prefix they require.  */
> > +	if (i.tm.base_opcode & 0xff0000)
> > +	  add_prefix ((i.tm.base_opcode >> 16) & 0xff);
> 
> Err, what about `lfence' and `mfence'?
> {"lfence",    0, 0x0faee8,  X, CpuP4, FP,		{ 0, 0, 0 } },
> {"mfence",    0, 0x0faef0,  X, CpuP4, FP,		{ 0, 0, 0 } },

You can probably fix this problem with the following.

{"lfence",    0, 0x0fae, 0xe8, CpuP4, FP|ImmExt,	{ 0, 0, 0 } },
{"mfence",    0, 0x0fae, 0xf0, CpuP4, FP|ImmExt,	{ 0, 0, 0 } },

If this works (please check it, I haven't!), the patch is OK to commit
(with spelling fix for `either')

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