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| author | Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com> | 2021-04-30 18:12:08 -0300 |
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| committer | Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com> | 2021-04-30 18:12:08 -0300 |
| commit | e941e0ae80626b7661c1db8953a673cafd3b8b19 (patch) | |
| tree | 42b3dcccfce69af0f7ffb0fa4ed2ed75734b82a2 /sysdeps/powerpc/powerpc64/multiarch/memcpy-power10.S | |
| parent | dd59655e9371af86043b97e38953f43bd9496699 (diff) | |
| download | glibc-e941e0ae80626b7661c1db8953a673cafd3b8b19.tar.gz glibc-e941e0ae80626b7661c1db8953a673cafd3b8b19.tar.xz glibc-e941e0ae80626b7661c1db8953a673cafd3b8b19.zip | |
powerpc64le: Optimize memcpy for POWER10
This implementation is based on __memcpy_power8_cached and integrates suggestions from Anton Blanchard. It benefits from loads and stores with length for short lengths and for tail code, simplifying the code. All unaligned memory accesses use instructions that do not generate alignment interrupts on POWER10, making it safe to use on caching-inhibited memory. The main loop has also been modified in order to increase instruction throughput by reducing the dependency on updates from previous iterations. On average, this implementation provides around 30% improvement when compared to __memcpy_power7 and 10% improvement in comparison to __memcpy_power8_cached.
Diffstat (limited to 'sysdeps/powerpc/powerpc64/multiarch/memcpy-power10.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc64/multiarch/memcpy-power10.S | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/sysdeps/powerpc/powerpc64/multiarch/memcpy-power10.S b/sysdeps/powerpc/powerpc64/multiarch/memcpy-power10.S new file mode 100644 index 0000000000..70e0fc3ed6 --- /dev/null +++ b/sysdeps/powerpc/powerpc64/multiarch/memcpy-power10.S @@ -0,0 +1,26 @@ +/* Optimized memcpy implementation for POWER10. + Copyright (C) 2021 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#if defined __LITTLE_ENDIAN__ && IS_IN (libc) +#define MEMCPY __memcpy_power10 + +#undef libc_hidden_builtin_def +#define libc_hidden_builtin_def(name) + +#include <sysdeps/powerpc/powerpc64/le/power10/memcpy.S> +#endif |