Hi,
Ian Lance Taylor <iant@xxxxxxxxxx> writes:
> ludo@xxxxxxx (Ludovic CourtÃs) writes:
[...]
>> Namely, clobbering a specific register doesnât sound wise here since
>> this asm snippet will be part of the bytecode interpreter, where GCCâs
>> register allocator can supposedly do a better job if I donât make its
>> life harder by clobbering an arbitrarily-chosen register.
>
> I would do this anyhow. Assuming your target has several general
> purpose registers, then the register allocator will work around the loss
> of one of them across an asm statement. How about something like
>
> int result asm ("r1");
>
> and then mark the asm as clobbering r1.
Yes, thatâd work.
However, Iâm targeting x86, hence my concern for register allocation.
Thanks for taking the time!
Ludoâ.
