Message256275
| Author |
arigo |
| Recipients |
arigo, mark.dickinson, rhettinger, serhiy.storchaka, skrah, tim.peters, vstinner |
| Date |
2015年12月12日.09:53:20 |
| SpamBayes Score |
-1.0 |
| Marked as misclassified |
Yes |
| Message-id |
<1449914001.44.0.479776675963.issue25823@psf.upfronthosting.co.za> |
| In-reply-to |
| Content |
Fwiw, I made a trivial benchmark in C that loads aligned and misaligned shorts ( http://paste.pound-python.org/show/HwnbCI3Pqsj8bx25Yfwp/ ). It shows that the memcpy() version takes only 65% of the time taken by the two-bytes-loaded version on a 2010 laptop. It takes 75% of the time on a modern server. On a recent little-endian PowerPC machine, 96%. On aarch64, only 45% faster (i.e. more than twice faster). This is all with gcc. It seems that using memcpy() is definitely a win nowadays. |
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