On 09/15/2016 10:48 AM, Alex Bennée wrote:
Ahh ok. The ARM code just allocates temps on demand including for its
zero register which I guess means multiple ones could be assigned. There
is also temp allocation logic to free them at the end of the block.
I wonder if this is something that should be more of a feature of the
core TCG code because let's face it temp tracking is a pain.
Yep, sparc and s390 have a similar bit of temp tracking. It would be nice for
that to be generic.
Does the code generator suffer if temps aren't freed as soon as
possible? Is there a reason why we don't just do a general free all
temps at the end of the block?
Freeing temps as quickly as possible means that we minimize the number of temps
required, and the register allocator has a couple of O(N**2) places, for N ==
number of temps.
r~
