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Re: [patch] tuning gcc for Intel Core2
- From: Michael Matz <matz at suse dot de>
- To: "H. J. Lu" <hjl at lucon dot org>
- Cc: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
- Date: Tue, 14 Nov 2006 17:32:31 +0100 (CET)
- Subject: Re: [patch] tuning gcc for Intel Core2
- References: <4558A4DD.firstname.lastname@example.org> <20061114062718.GA11289@lucon.org>
On Mon, 13 Nov 2006, H. J. Lu wrote:
> for Core 2, which will avoid external calls to memset. There are known
> serious performance problems with x86-64 memory functions, especially on
> Core 2. We are working on improving x86-64 memory functions. A better
> external memset can improve gcc in SPEC CPU 2K by more than 20%.
Well, there are tuned external mem* routines available since years, also
submitted to glibc, but rejected on the grounds that they were tuned for
Opterons (despite helping Intel CPUs quite a bit) and new "generic"
routines would be written for glibc. That was a few months ago, since
then silence ... :-/