Temporary Hard register

[ftwilliam]

I need a hard register for a define_insn output.

I have had issues before when using clobber in a define_insn pattern;
I will give it another try.

Is there an example I can be pointed to where a temporary hard
register is obtained via secondary reload ?

On Mon, Apr 27, 2015 at 11:39 AM, Jeff Law <law@redhat.com> wrote:
> On 04/27/2015 10:30 AM, ftwilliam wrote:
>>
>> Is there a function that can be used to obtain a temporary hard
>> register without defining it in FIXED_REGISTERS and
>> CALL_USED_REGISTERS ?
>
> For what purpose?
>
> If you need a scratch/temporary for reload, the way to get them is via
> secondary reloads.
>
> If you just need a scratch register for a pattern, you can allocate a pseudo
> in an expander and clobber it in the pattern.
>
> You can also use match_scratch.  Though you might invite Vladimir's wrath
> for doing that.
>
> Jeff
>