This is the mail archive of the mailing list for the GCC project.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: [tree-ssa] Garbage collector x bb annotations

On Oct 8, 2003, at 10:01 AM, S. Bosscher wrote:

The real solution would be to
finally convert basic blocks to ggc.  Volunteers?

I may try (I need it anyway for tree-ssa-cfg branch). The whole issue is however quite ugly as this combines basically all allocation mechanisms that are available in gcc (basic blocks themselves are pool allocated).

We already mix everything now: bitmaps that are xmalloc'ed, annotations are
ggc'ed, and bbs and edges are pool allocated. Talk about fragile...
BBs and edges and everything attacked to it should also be garbage
collected. If we ever go on to save functions as graphs then that would be
more convenient anyway.

The reason BB's are pool allocated is for locality. There is actually a measurable difference if you ggc allocate them and different bb's end up in different pages.

It seems better to allow things hanging off them to be marked, then it does to ggc allocate them.

We shouldn't ggc allocate things just because it's the easiest way to get it's children marked.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]