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author | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | 2017-12-11 17:39:42 -0200 |
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committer | Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com> | 2017-12-11 17:39:42 -0200 |
commit | c9cd7b0ce5c52a3dac7347084651d7df0b39a6d0 (patch) | |
tree | 725d9e24e8a3c66866e2b8963928d4857f09b561 /sysdeps/powerpc/powerpc64/multiarch/Makefile | |
parent | e70c6fee466d26af36a38270e451cbe3273a6660 (diff) | |
download | glibc-c9cd7b0ce5c52a3dac7347084651d7df0b39a6d0.tar.gz glibc-c9cd7b0ce5c52a3dac7347084651d7df0b39a6d0.tar.xz glibc-c9cd7b0ce5c52a3dac7347084651d7df0b39a6d0.zip |
powerpc: POWER8 memcpy optimization for cached memory
On POWER8, unaligned memory accesses to cached memory has little impact on performance as opposed to its ancestors. It is disabled by default and will only be available when the tunable glibc.tune.cached_memopt is set to 1. __memcpy_power8_cached __memcpy_power7 ============================================================ max-size=4096: 33325.70 ( 12.65%) 38153.00 max-size=8192: 32878.20 ( 11.17%) 37012.30 max-size=16384: 33782.20 ( 11.61%) 38219.20 max-size=32768: 33296.20 ( 11.30%) 37538.30 max-size=65536: 33765.60 ( 10.53%) 37738.40 * manual/tunables.texi (Hardware Capability Tunables): Document glibc.tune.cached_memopt. * sysdeps/powerpc/cpu-features.c: New file. * sysdeps/powerpc/cpu-features.h: New file. * sysdeps/powerpc/dl-procinfo.c [!IS_IN(ldconfig)]: Add _dl_powerpc_cpu_features. * sysdeps/powerpc/dl-tunables.list: New file. * sysdeps/powerpc/ldsodefs.h: Include cpu-features.h. * sysdeps/powerpc/powerpc32/power4/multiarch/init-arch.h (INIT_ARCH): Initialize use_aligned_memopt. * sysdeps/powerpc/powerpc64/dl-machine.h [defined(SHARED && IS_IN(rtld))]: Restrict dl_platform_init availability and initialize CPU features used by tunables. * sysdeps/powerpc/powerpc64/multiarch/Makefile (sysdep_routines): Add memcpy-power8-cached. * sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c: Add __memcpy_power8_cached. * sysdeps/powerpc/powerpc64/multiarch/memcpy.c: Likewise. * sysdeps/powerpc/powerpc64/multiarch/memcpy-power8-cached.S: New file. Reviewed-by: Rajalakshmi Srinivasaraghavan <raji@linux.vnet.ibm.com>
Diffstat (limited to 'sysdeps/powerpc/powerpc64/multiarch/Makefile')
-rw-r--r-- | sysdeps/powerpc/powerpc64/multiarch/Makefile | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sysdeps/powerpc/powerpc64/multiarch/Makefile b/sysdeps/powerpc/powerpc64/multiarch/Makefile index dea49acff5..4df6b45c4c 100644 --- a/sysdeps/powerpc/powerpc64/multiarch/Makefile +++ b/sysdeps/powerpc/powerpc64/multiarch/Makefile @@ -1,6 +1,6 @@ ifeq ($(subdir),string) -sysdep_routines += memcpy-power7 memcpy-a2 memcpy-power6 memcpy-cell \ - memcpy-power4 memcpy-ppc64 \ +sysdep_routines += memcpy-power8-cached memcpy-power7 memcpy-a2 memcpy-power6 \ + memcpy-cell memcpy-power4 memcpy-ppc64 \ memcmp-power8 memcmp-power7 memcmp-power4 memcmp-ppc64 \ memset-power7 memset-power6 memset-power4 \ memset-ppc64 memset-power8 \ |