This is the mail archive of the
mailing list for the GCC project.
Re: RFH: _inter_-procedure optimizations "CALL_REALLY_USED_REGISTERS"
Steven Bosscher wrote:
> any case, you should assume that it is a much bigger job than just
> modifying the call expander.
Ok, I had a closer look at what is happening in present state gcc and I
understand that it is indeed a much more complex task than I first thought.
One Issue would be also, that it probably would be worth considering which
other kind of information (except register clobbering information) on a
static leaf function would be worth to be shared with the caller:
memory usage of the called function / memory clobbers, information on whether
it's a pure function ?
Probably once one starts to try to implement kind of a database containing
information on all the functions that are already compiled, one might make
efforts to support all of the most useful information. Of course there always
will be trade-offs concerning compilation time and memory consumption.
I still would like to try my very best to look after this, but I'd prefer to
start by scanning literature. If anyone could help me out recommending good
articles / textbooks dealing with inter-function optimizations. It would be