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c9cd7b0ce5
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>
94 lines
2.7 KiB
C
94 lines
2.7 KiB
C
/* Data for processor capability information. PowerPC version.
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Copyright (C) 2005-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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/* This information must be kept in sync with the _DL_HWCAP_COUNT
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definition in procinfo.h.
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If anything should be added here check whether the size of each string
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is still ok with the given array size.
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All the #ifdefs in the definitions are quite irritating but
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necessary if we want to avoid duplicating the information. There
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are three different modes:
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- PROCINFO_DECL is defined. This means we are only interested in
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declarations.
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- PROCINFO_DECL is not defined:
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+ if SHARED is defined the file is included in an array
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initializer. The .element = { ... } syntax is needed.
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+ if SHARED is not defined a normal array initialization is
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needed.
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*/
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#ifndef PROCINFO_CLASS
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# define PROCINFO_CLASS
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#endif
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#if !IS_IN (ldconfig)
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# if !defined PROCINFO_DECL && defined SHARED
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._dl_powerpc_cpu_features
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# else
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PROCINFO_CLASS struct cpu_features _dl_powerpc_cpu_features
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# endif
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# ifndef PROCINFO_DECL
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= { }
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# endif
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# if !defined SHARED || defined PROCINFO_DECL
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;
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# else
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,
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# endif
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#endif
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#if !defined PROCINFO_DECL && defined SHARED
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._dl_powerpc_cap_flags
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#else
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PROCINFO_CLASS const char _dl_powerpc_cap_flags[64][15]
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#endif
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#ifndef PROCINFO_DECL
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= {
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"ppcle", "true_le", "", "",
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"", "", "archpmu", "vsx",
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"arch_2_06", "power6x", "dfp", "pa6t",
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"arch_2_05", "ic_snoop", "smt", "booke",
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"cellbe", "power5+", "power5", "power4",
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"notb", "efpdouble", "efpsingle", "spe",
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"ucache", "4xxmac", "mmu", "fpu",
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"altivec", "ppc601", "ppc64", "ppc32",
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"", "", "", "",
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"", "", "", "",
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"", "", "", "",
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"", "", "", "",
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"", "", "", "htm-no-suspend",
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"scv", "darn", "ieee128", "arch_3_00",
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"htm-nosc", "vcrypto", "tar", "isel",
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"ebb", "dscr", "htm", "arch_2_07",
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}
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#endif
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#if !defined SHARED || defined PROCINFO_DECL
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;
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#else
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,
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#endif
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#undef PROCINFO_DECL
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#undef PROCINFO_CLASS
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