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| author | Siddhesh Poyarekar <siddhesh@sourceware.org> | 2017-12-13 18:50:27 +0530 |
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| committer | Siddhesh Poyarekar <siddhesh@sourceware.org> | 2017-12-13 18:50:27 +0530 |
| commit | 2bce01ebbaf8db52ba4a5635eb5744f989cdbf69 (patch) | |
| tree | ebe39cd2ac5534dccbda2169eb1753d3781df178 /ChangeLog | |
| parent | 243b63337c2c02f30ec3a988ecc44bc0f6ffa0ad (diff) | |
| download | glibc-2bce01ebbaf8db52ba4a5635eb5744f989cdbf69.tar.gz glibc-2bce01ebbaf8db52ba4a5635eb5744f989cdbf69.tar.xz glibc-2bce01ebbaf8db52ba4a5635eb5744f989cdbf69.zip | |
aarch64: Improve strcmp unaligned performance
Replace the simple byte-wise compare in the misaligned case with a dword compare with page boundary checks in place. For simplicity I've chosen a 4K page boundary so that we don't have to query the actual page size on the system. This results in up to 3x improvement in performance in the unaligned case on falkor and about 2.5x improvement on mustang as measured using bench-strcmp. * sysdeps/aarch64/strcmp.S (misaligned8): Compare dword at a time whenever possible.
Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog index 22df17b671..a5419e199a 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,8 @@ +2017-12-13 Siddhesh Poyarekar <siddhesh@sourceware.org> + + * sysdeps/aarch64/strcmp.S (misaligned8): Compare dword at a + time whenever possible. + 2017-12-12 Carlos O'Donell <carlos@redhat.com> * elf/Makefile [$(nss-crypt)$(static-nss-crypt) == yesno] |