[PATCH v4 0/3] arm64: Add optimized memset/memcpy/memove functions
Stefan Roese
sr at denx.de
Thu Aug 12 16:47:48 CEST 2021
On an NXP LX2160 based platform it has been noticed, that the currently
implemented memset/memcpy functions for aarch64 are suboptimal.
Especially the memset() for clearing the NXP MC firmware memory is very
expensive (time-wise).
This patchset now adds the optimized functions ported from this
repository:
https://github.com/ARM-software/optimized-routines
As the optimized memset function make use of the dc opcode, which needs
the caches to be enabled, an additional check is added and a simple
memset version is used in this case.
Please note that checkpatch.pl complains about some issue with this
imported file: arch/arm/lib/asmdefs.h
Since it's imported I did explicitly not make any changes here, to make
potential future sync'ing easer.
Here some numbers to see the speed improments:
Current original version:
-------------------------
memset() 32 Bytes, 16M times:
time: 0.446 seconds
memset() 16MiB, 256 times:
time: 1.076 seconds
memcpy() 512MiB:
time: 0.224 seconds
New optimized version:
----------------------
memset() 32 Bytes, 16M times:
time: 0.287 seconds
memset() 16MiB, 256 times:
time: 0.292 seconds
memcpy() 512MiB:
time: 0.222 seconds
Summary:
The optimized memcpy is nearly identical to the original one. But the
optimized memset is much faster, for small and big sizes. Small sizes
factor ~1.6 and big sizes factor ~3.7.
Note: These measurements were done on the NXP LX2160ARDB board.
Thanks,
Stefan
Changes in v4:
- Use macros instead of register names, following the optimized code
- Add zero size check
Changes in v3:
- Add memmove alias, as this function also handles it optimized
- Add memmove as well
Changes in v2:
- Add file names and locations and git commit ID from imported files
to the commit message
- New patch
Stefan Roese (3):
arm64: arch/arm/lib: Add optimized memset/memcpy/memmove functions
arm64: memset-arm64: Use simple memset when cache is disabled
arm64: Kconfig: Enable usage of optimized memset/memcpy/memmove
arch/arm/Kconfig | 38 +++++-
arch/arm/include/asm/string.h | 4 +
arch/arm/lib/Makefile | 5 +
arch/arm/lib/asmdefs.h | 98 ++++++++++++++
arch/arm/lib/memcpy-arm64.S | 242 ++++++++++++++++++++++++++++++++++
arch/arm/lib/memset-arm64.S | 148 +++++++++++++++++++++
6 files changed, 529 insertions(+), 6 deletions(-)
create mode 100644 arch/arm/lib/asmdefs.h
create mode 100644 arch/arm/lib/memcpy-arm64.S
create mode 100644 arch/arm/lib/memset-arm64.S
--
2.32.0
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