/* The assembly function for memset. C-SKY ABIV2 version. Copyright (C) 2018 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 <http://www.gnu.org/licenses/>. */ #include <sysdep.h> ENTRY (memset) /* Test if len less than 4 bytes. */ mov r12, r0 cmplti r2, 8 bt .L_set_by_byte andi r13, r0, 3 movi r19, 4 /* Test if dest is not 4 bytes aligned. */ bnez r13, .L_dest_not_aligned /* Hardware can handle unaligned access directly. */ .L_dest_aligned: zextb r1, r1 mov r3, r1 lsli r1, 8 or r1, r3 lsli r3, r1, 16 or r3, r1 /* If dest is aligned, then copy. */ zext r18, r2, 31, 4 /* Test if len less than 16 bytes. */ bez r18, .L_len_less_16bytes LABLE_ALIGN .L_len_larger_16bytes: stw r3, (r0, 0) stw r3, (r0, 4) stw r3, (r0, 8) stw r3, (r0, 12) PRE_BNEZAD (r18) addi r0, 16 BNEZAD (r18, .L_len_larger_16bytes) .L_len_less_16bytes: zext r18, r2, 3, 2 andi r2, 3 bez r18, .L_set_by_byte .L_len_less_16bytes_loop: stw r3, (r0, 0) PRE_BNEZAD (r18) addi r0, 4 BNEZAD (r18, .L_len_less_16bytes_loop) /* Test if len less than 4 bytes. */ .L_set_by_byte: zext r18, r2, 2, 0 bez r18, .L_return .L_set_by_byte_loop: stb r1, (r0, 0) PRE_BNEZAD (r18) addi r0, 1 BNEZAD (r18, .L_set_by_byte_loop) .L_return: mov r0, r12 rts /* If dest is not aligned, just set some bytes makes the dest align. */ .L_dest_not_aligned: sub r13, r19, r13 sub r2, r13 .L_dest_not_aligned_loop: /* Makes the dest align. */ stb r1, (r0, 0) PRE_BNEZAD (r13) addi r0, 1 BNEZAD (r13, .L_dest_not_aligned_loop) cmplti r2, 8 bt .L_set_by_byte /* Check whether the src is aligned. */ br .L_dest_aligned END (memset) libc_hidden_builtin_def (memset) .weak memset