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| author | Paul E. Murphy <murphyp@linux.vnet.ibm.com> | 2020-05-18 11:16:06 -0500 |
|---|---|---|
| committer | Paul E. Murphy <murphyp@linux.vnet.ibm.com> | 2020-06-05 15:30:00 -0500 |
| commit | a23bd00f9d810c28d9e83ce1d7cf53968375937d (patch) | |
| tree | ad8b0472058d43b628bb9882d999fa3b3514cd7c /sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c | |
| parent | 6ef422750985f7e60a8d480f07ecda59e0311fdf (diff) | |
| download | glibc-a23bd00f9d810c28d9e83ce1d7cf53968375937d.tar.gz glibc-a23bd00f9d810c28d9e83ce1d7cf53968375937d.tar.xz glibc-a23bd00f9d810c28d9e83ce1d7cf53968375937d.zip | |
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.
Diffstat (limited to 'sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c')
| -rw-r--r-- | sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c index 59a227ee22..ea10b00417 100644 --- a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c +++ b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c @@ -111,6 +111,10 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array, /* Support sysdeps/powerpc/powerpc64/multiarch/strlen.c. */ IFUNC_IMPL (i, name, strlen, +#ifdef __LITTLE_ENDIAN__ + IFUNC_IMPL_ADD (array, i, strcpy, hwcap2 & PPC_FEATURE2_ARCH_3_00, + __strlen_power9) +#endif IFUNC_IMPL_ADD (array, i, strlen, hwcap2 & PPC_FEATURE2_ARCH_2_07, __strlen_power8) IFUNC_IMPL_ADD (array, i, strlen, hwcap & PPC_FEATURE_HAS_VSX, |