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| author | Wilco Dijkstra <wdijkstr@arm.com> | 2016-06-20 17:38:13 +0100 |
|---|---|---|
| committer | Wilco Dijkstra <wdijkstr@arm.com> | 2016-06-20 17:41:33 +0100 |
| commit | b998e16e71c8617746b7c39500e925d28ff22ed8 (patch) | |
| tree | 6cca1efccbf603c0664547d4fd66d625806d6396 /ChangeLog | |
| parent | aca1daef298b43bd7b1987b31f5aabcf6c2f6021 (diff) | |
| download | glibc-b998e16e71c8617746b7c39500e925d28ff22ed8.tar.gz glibc-b998e16e71c8617746b7c39500e925d28ff22ed8.tar.xz glibc-b998e16e71c8617746b7c39500e925d28ff22ed8.zip | |
This is an optimized memcpy/memmove for AArch64. Copies are split into 3 main
cases: small copies of up to 16 bytes, medium copies of 17..96 bytes which are fully unrolled. Large copies of more than 96 bytes align the destination and use an unrolled loop processing 64 bytes per iteration. In order to share code with memmove, small and medium copies read all data before writing, allowing any kind of overlap. All memmoves except for the large backwards case fall into memcpy for optimal performance. On a random copy test memcpy/memmove are 40% faster on Cortex-A57 and 28% on Cortex-A53. * sysdeps/aarch64/memcpy.S (memcpy): Rewrite of optimized memcpy and memmove. * sysdeps/aarch64/memmove.S (memmove): Remove memmove code (merged into memcpy.S).
Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog index 67341c27f5..a9cedf0cb9 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,10 @@ +2016-06-20 Wilco Dijkstra <wdijkstr@arm.com> + + * sysdeps/aarch64/memcpy.S (memcpy): + Rewrite of optimized memcpy and memmove. + * sysdeps/aarch64/memmove.S (memmove): Remove + memmove code (merged into memcpy.S). + 2016-06-20 Florian Weimer <fweimer@redhat.com> Consolidate machine-agnostic DTV definitions in <dl-dtv.h>. |