On 08/16/2011 04:20 AM, Kirill Yukhin wrote:
> Hi guys,
> the question is still opened. Let me try to explain further.
>
> The new MULX instruction is capable to store result of unsigned
> multiply to arbitrary pair of GPRs (one of operands still must be DX).
> But I have no idea, how to implement such a constraint.
> Here is define_insn which is works but uses i386's "A" constraint. It
> is much worse than using any pair of registers.
See {u}mulsidi3_internal in mn10300.md for an example of a
double-word multiplication with two independent outputs.
r~
