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/*
Copyright 2022 Gabriel Jensen
This file is part of rgo.
rgo 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 3 of the License, or (at your option) any later version.
rgo 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 rgo. If not, see <https://www.gnu.org/licenses/>.
*/
#include <rgo.h>
.global rgo_memfill
rgo_memfill:
#if defined(__x86_64__)
/*
rdi: void const * ptr
rsi: size_t num
dl: int_least8_t val
*/
/* We don't need to preserve any of the registers we use according to the ABI. */
/* rcx: Address of the current element. */
movq %rdi,%rcx
/* r8: Address of the last element. */
movq %rdi,%r8
addq %rsi,%r8
.loop:
cmpq %r8,%rcx
je .done /* Exit loop if we have reached the final element. */
movb %dl,(%rcx)
incq %rcx /* Continue to next element. */
jmp .loop
.done:
ret
#endif
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