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Re: hard_regno_nregs == 0 ?
DJ Delorie wrote:
Are there any ports besides m32c that have registers which can hold HI
(or SI I suppose) but not QI values?
IA-64 has branch registers that are only allowed to hold DImode values.
We use CANNOT_CHANGE_MODE_CLASS to enforce this.
On x86, the vector registers can hold SImode, but do not allow
HImode/QImode loads, and again CANNOT_CHANGE_MODE_CLASS is used to
I'm sure that there are other examples out there.
Jim Wilson, GNU Tools Support, http://www.specifix.com