Messages in this thread | | | Date | Mon, 09 Nov 2009 14:36:57 -0800 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH RFC] [X86] performance improvement for memcpy_64.S by fast string. |
| |
On 11/09/2009 10:54 AM, Andi Kleen wrote: >> Ling's numbers didn't seem to show a significant slowdown on Core 2 (it >> was something like 0.95x baseline in the worst case, and most of the >> cases were positive) so Core 2 doesn't seem to have a problem. > > I ran quite a lot of micro benchmarks with various alignments and sizes > the 'q' variant was not always a win. I haven't checked that particular > version though.
Well, if you have concrete information about what the problem cases are, then please provide it. If you don't, but have a hunch where these potential problems may lie, then please indicate what they might be. Otherwise, there isn't any actionable information here.
-hpa
| |