TRULY_NOOP_TRUNCATION doesn't allow it.
From-SVN: r6306
|| (GET_MODE_SIZE (mode) <= GET_MODE_SIZE (oldmode)
&& ((GET_CODE (x) == MEM && ! MEM_VOLATILE_P (x)
&& direct_load[(int) mode])
- || GET_CODE (x) == REG)))))
+ || (GET_CODE (x) == REG
+ && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode),
+ GET_MODE_BITSIZE (GET_MODE (x)))))))))
{
/* ?? If we don't know OLDMODE, we have to assume here that
X does not need sign- or zero-extension. This may not be