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riscv: Add and use alignment-ignorant memcpy

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For CPU implementations that can perform unaligned accesses with little
or no performance penalty, create a memcpy implementation that does not
bother aligning buffers. It will use a block of integer registers, a
single integer register, and fall back to bytewise copy for the
remainder.

Signed-off-by: Evan Green <evan@rivosinc.com>
Reviewed-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Evan Green
2024-02-27 14:56:43 -08:00
committed by Palmer Dabbelt
parent a2b47f7d46
commit 587a1290a1
5 changed files with 258 additions and 0 deletions
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9
sysdeps/unix/sysv/linux/riscv/Makefile
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@ -15,6 +15,15 @@ ifeq ($(subdir),stdlib)
gen-as-const-headers += ucontext_i.sym
endif
ifeq ($(subdir),string)
sysdep_routines += \
memcpy \
memcpy-generic \
memcpy_noalignment \
# sysdep_routines
endif
abi-variants := ilp32 ilp32d lp64 lp64d
ifeq (,$(filter $(default-abi),$(abi-variants)))

24
sysdeps/unix/sysv/linux/riscv/memcpy-generic.c Normal file
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@ -0,0 +1,24 @@
/* Re-include the default memcpy implementation.
Copyright (C) 2024 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/>. */
#include <string.h>
extern __typeof (memcpy) __memcpy_generic;
hidden_proto (__memcpy_generic)
#include <string/memcpy.c>