uclibc-ng/libc/string/avr32/memset.S

/*
 * Copyright (C) 2004-2007 Atmel Corporation
 *
 * This file is subject to the terms and conditions of the GNU Lesser General
 * Public License.  See the file "COPYING.LIB" in the main directory of this
 * archive for more details.
 */

#include <features.h>

#define s r12
#define c r11
#define n r10

       .text
       .global memset
       .type   memset, @function

       .global __memset
       .hidden __memset
       .type   __memset, @function

       .align  1
memset:
__memset:
       cp.w    n, 32
       mov     r9, s
       brge    .Llarge_memset

       sub     n, 1
       retlt   s
1:     st.b    s++, c
       sub     n, 1
       brge    1b

       retal   r9

.Llarge_memset:
       mov     r8, r11
       mov     r11, 3
       bfins   r8, r8, 8, 8
       bfins   r8, r8, 16, 16
       tst     s, r11
       breq    2f

1:     st.b    s++, r8
       sub     n, 1
       tst     s, r11
       brne    1b

2:     mov     r11, r9
       mov     r9, r8
       sub     n, 8

3:     st.d    s++, r8
       sub     n, 8
       brge    3b

       /* If we are done, n == -8 and we'll skip all st.b insns below */
       neg     n
       lsl     n, 1
       add     pc, n
       .rept   7
       st.b    s++, r8
       .endr
       retal   r11

       .size   memset, . - memset

libc_hidden_def(memset)