Is (set (subreg:SI (reg:HI) 0) (const_int)) valid rtx?

[Joern Rennecke]

> Here (reg:HI ...) is a pseudo register.  If this is valid, is the
> register allocator supposed to allocate an SImode hard register for
> (subreg:SI (reg:HI) 0)?  Or should this be canonicalized to the
> following?
> 
>   (set (reg:HI ...)
>        (const_int ...))

I'd say that that depends on WORD_REGISTER_OPERATIONS.

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