From 75c1aee500ac95bde2b800b3d787c0dd805a8a82 Mon Sep 17 00:00:00 2001 From: Anton Youdkevitch Date: Tue, 16 Oct 2018 11:00:27 -0700 Subject: aarch64: optimized memcpy implementation for thunderx2 Since aligned loads and stores are huge performance advantage the implementation always tries to do aligned access. Among the cases when src and dst addresses are aligned or unaligned evenly there are cases of not evenly unaligned src and dst. For such cases (if the length is big enough) ext instruction is used to merge-and-shift two memory chunks loaded from two adjacent aligned locations and then the adjusted chunk gets stored to aligned address. Performance gain against the current T2 implementation: memcpy-large: 65K-32M: +40% - +10% memcpy-walk: 128-32M: +20% - +2% --- ChangeLog | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'ChangeLog') diff --git a/ChangeLog b/ChangeLog index 8a1ca3e1e1..f3c543aa41 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,9 @@ +2018-10-16 Anton Youdkevitch + + * sysdeps/aarch64/multiarch/memcpy_thunderx.S: Remove thunderx2 code. + * sysdeps/aarch64/multiarch/memcpy_thunderx2.S: New implementation + for thunderX2. + 2018-10-15 Joseph Myers * sysdeps/unix/sysv/linux/Makefile (sysdep_headers): Add -- cgit 1.4.1