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4dc83cac78
Qualcomm's new core (oryon-1) has a different performance characteristic than other cores. For memcpy, it is faster to use the GPRs to do the copy for large sizes (2x faster). For even larger sizes, it is better to use the nontemporal load/store instructions so we don't pollute the L1/L2 caches. For smaller sizes, the characteristic are very similar to other cores. I used the thunderx memcpy as a starting point and expanded from there. Changes since v1: * v2: Fix ordering in Makefile. * v3: Fix comment grammar about the ldnp/stnp instructions. Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
72 lines
2.3 KiB
C
72 lines
2.3 KiB
C
/* Multiple versions of memcpy. AARCH64 version.
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Copyright (C) 2017-2024 Free Software Foundation, Inc.
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Copyright The GNU Toolchain Authors.
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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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<https://www.gnu.org/licenses/>. */
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/* Define multiple versions only for the definition in libc. */
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#if IS_IN (libc)
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/* Redefine memcpy so that the compiler won't complain about the type
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mismatch with the IFUNC selector in strong_alias, below. */
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# undef memcpy
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# define memcpy __redirect_memcpy
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# include <string.h>
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# include <init-arch.h>
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extern __typeof (__redirect_memcpy) __libc_memcpy;
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extern __typeof (__redirect_memcpy) __memcpy_generic attribute_hidden;
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extern __typeof (__redirect_memcpy) __memcpy_thunderx attribute_hidden;
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extern __typeof (__redirect_memcpy) __memcpy_thunderx2 attribute_hidden;
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extern __typeof (__redirect_memcpy) __memcpy_a64fx attribute_hidden;
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extern __typeof (__redirect_memcpy) __memcpy_sve attribute_hidden;
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extern __typeof (__redirect_memcpy) __memcpy_mops attribute_hidden;
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extern __typeof (__redirect_memcpy) __memcpy_oryon1 attribute_hidden;
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static inline __typeof (__redirect_memcpy) *
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select_memcpy_ifunc (void)
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{
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INIT_ARCH ();
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if (mops)
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return __memcpy_mops;
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if (sve && HAVE_AARCH64_SVE_ASM)
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{
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if (IS_A64FX (midr))
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return __memcpy_a64fx;
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return prefer_sve_ifuncs ? __memcpy_sve : __memcpy_generic;
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}
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if (IS_ORYON1 (midr))
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return __memcpy_oryon1;
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if (IS_THUNDERX (midr))
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return __memcpy_thunderx;
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if (IS_THUNDERX2 (midr) || IS_THUNDERX2PA (midr))
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return __memcpy_thunderx2;
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return __memcpy_generic;
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}
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libc_ifunc (__libc_memcpy, select_memcpy_ifunc ());
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# undef memcpy
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strong_alias (__libc_memcpy, memcpy);
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#endif
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