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authorPaul E. Murphy <murphyp@linux.vnet.ibm.com>2020-05-18 11:16:06 -0500
committerPaul E. Murphy <murphyp@linux.vnet.ibm.com>2020-06-05 15:30:00 -0500
commita23bd00f9d810c28d9e83ce1d7cf53968375937d (patch)
treead8b0472058d43b628bb9882d999fa3b3514cd7c /elf
parent6ef422750985f7e60a8d480f07ecda59e0311fdf (diff)
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powerpc64le: add optimized strlen for P9
This started as a trivial change to Anton's rawmemchr. I got carried away. This is a hybrid between P8's asympotically faster 64B checks with extremely efficient small string checks e.g <64B (and sometimes a little bit more depending on alignment). The second trick is to align to 64B by running a 48B checking loop 16B at a time until we naturally align to 64B (i.e checking 48/96/144 bytes/iteration based on the alignment after the first 5 comparisons). This allieviates the need to check page boundaries. Finally, explicly use the P7 strlen with the runtime loader when building P9. We need to be cautious about vector/vsx extensions here on P9 only builds.
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