Duncan wrote: > Could you point me at some info on this one (-ftree-vectorize)? It came > up on the amd64 list a week or so ago, when someone asked what I thought > of it and why I didn't have it in my cflags (which I had just explained). > I said I didn't know enough about it to make a case either way, and as > such, didn't choose to use it. However, after a bit of discussion, I > decided to add it to my cflags on a very experimental basis. I haven't > experienced any issues with it, but then I haven't done any major > compiling since then either, only the routine updates.
http://tinyurl.com/l75we They've fixed quite a few of the ICE's since last I looked, though there's more than a couple that went in after 4.1.1. 4.2 is a little better, but I'm having enough trouble getting it to build things properly _without_ using any fancy flags right now. ;p See http://tinyurl.com/rt3aa for some real-world examples. > Or does the problem not necessarily apply to amd64? Even knowing that > would be useful. I simply don't know anything much at all about it, beyond > a generally vague idea that it means using mmx/sse/whatever vector > instructions to parallelize loops. I'd say that there's more ICE's on i686-pc-linux-gnu than x86_64-*-linux-gnu, but there's still enough. Luckily Halcy0n was really good for reducing testcases and pushing them upstream, so a lot of these issues got fixed at the source. --de.
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