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| Date: | Sat, 29 Jan 2000 14:35:44 +0100 |
| From: | Marc Lehmann <marc AT gimp DOT org> |
| To: | pgcc AT delorie DOT com |
| Subject: | Re: pgcc and egcs alignment -- function, basic block and string |
| Message-ID: | <20000129143544.G1024@cerebro.laendle> |
| Mail-Followup-To: | pgcc AT delorie DOT com |
| References: | <38921CD6 DOT 2A725779 AT ix DOT netcom DOT com> <20000129032101 DOT A25630 AT atrey DOT karlin DOT mff DOT cuni DOT cz> <38927310 DOT 2033EED4 AT ix DOT netcom DOT com> |
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| In-Reply-To: | <38927310.2033EED4@ix.netcom.com>; from cbsears@ix.netcom.com on Fri, Jan 28, 2000 at 08:56:48PM -0800 |
| X-Operating-System: | Linux version 2.2.14 (root AT cerebro) (gcc version 2.95.1 19990816 (release)) |
| Reply-To: | pgcc AT delorie DOT com |
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On Fri, Jan 28, 2000 at 08:56:48PM -0800, Chris Sears <cbsears AT ix DOT netcom DOT com> wrote:
> Is there a switch to turn this alignment off so that I could test it?
Yes, -malign-loops=xxx, -malign-functions=xxx etc.. Just read the
manual(tm).
> Admittedly, a cache line is word aligned as well,
> but wouldn't .align 4 suffice to align to a word boundary?
It depends. The only way data alginment hurts is by wasting space, which
is rarely a problem (despite cache problems). aligning to a cache line
helps in practise, although one would think that natural alignment would
suffice.
Maybe a aligning on longwords is a good trade-off, but that needs
extensive benchmark data.
> > I will verify this tommorow and in case you are correct, I will fix this bug.
> If possible could you send me email telling me what happened.
this list, please ;->
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