> On Jun 24, 2024, at 1:50 AM, Stefan Schulze Frielinghaus
> <stefa...@linux.ibm.com> wrote:
>
> Ping.
>
> On Mon, Jun 10, 2024 at 07:19:19AM +0200, Stefan Schulze Frielinghaus wrote:
>> Ping.
>>
>> On Fri, May 24, 2024 at 11:13:12AM +0200, Stefan Schulze Frielinghaus wrote:
>>> This implements hard register constraints for inline asm. A hard register
>>> constraint is of the form {regname} where regname is any valid register.
>>> This
>>> basically renders register asm superfluous. For example, the snippet
>>>
>>> int test (int x, int y)
>>> {
>>> register int r4 asm ("r4") = x;
>>> register int r5 asm ("r5") = y;
>>> unsigned int copy = y;
>>> asm ("foo %0,%1,%2" : "+d" (r4) : "d" (r5), "d" (copy));
>>> return r4;
>>> }
>>>
>>> could be rewritten into
>>>
>>> int test (int x, int y)
>>> {
>>> asm ("foo %0,%1,%2" : "+{r4}" (x) : "{r5}" (y), "d" (y));
>>> return x;
>>> }
I like this idea but I'm wondering: regular constraints specify what sort of
value is needed, for example an int vs. a short int vs. a float. The notation
you've shown doesn't seem to have that aspect.
The other comment is that I didn't see documentation updates to reflect this
new feature.
paul
