10 Sep
2010
10 Sep
'10
5:15 p.m.
On Tue, 2010-09-07 at 13:09 +0100, Andrew Stubbs wrote:
On 07/09/10 13:01, Yao Qi wrote:
- Investigate reduced alignment constraints?
Any details on this?
No, I just know that some targets like to align functions to cache-lines. This is a useful speed optimization, but does lead to lots of "blank" gaps in the code. I have no real idea if ARM does this kind of thing, or if the ABI has anything to say about it.
I just suggest that we should check it out - or at least ask an ARM expert if I'm talking nonsense. :)
I'm pretty certain we don't do this with gratuitously -Os on ARM. We may, however, align some thumb functions to a 32-bit boundary unnecessarily (still needed if there's a literal pool).
R.