Gentoo Archives: gentoo-dev

From: Duncan <1i5t5.duncan@×××.net>
To: gentoo-dev@l.g.o
Subject: [gentoo-dev] Re: [RFC] CFLAGS paragraph for the GWN
Date: Sun, 01 Oct 2006 11:26:57
Message-Id: efo8fp$ohk$
In Reply to: [gentoo-dev] Re: [RFC] CFLAGS paragraph for the GWN by Ryan Hill
Ryan Hill <×××××.com> posted efmrae$jff$1@×××××××××.org,
excerpted below, on  Sat, 30 Sep 2006 16:37:05 -0600:

> If you want flags that just break > stuff with 4.1 you can include -ftree-vectorize.
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. If I had rather more info on it, therefore, particularly on why it might break stuff, I'd be able to pass it on, telling the list and in particular the guy that asked, why it's NOT a good thing to use. Thus, point me at it, if you got it. Even something as simple as a list of bugs traced to it would be useful as something I could point at, if that's what you are basing your remark on. 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. TIA. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master." Richard Stallman -- gentoo-dev@g.o mailing list


Subject Author
Re: [gentoo-dev] Re: [RFC] CFLAGS paragraph for the GWN Donnie Berkholz <dberkholz@g.o>
[gentoo-dev] Re: [RFC] CFLAGS paragraph for the GWN Ryan Hill <×××××.com>
Re: [gentoo-dev] Re: [RFC] CFLAGS paragraph for the GWN Jeroen Roovers <jer@g.o>