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/* memchr.S
* Copyright (C) 2003, 2005, 2006 Analog Devices Inc., All Rights Reserved.
*
* This file is subject to the terms and conditions of the GNU Library General
* Public License. See the file "COPYING.LIB" in the main directory of this
* archive for more details.
*
* Non-LGPL License also available as part of VisualDSP++
* http://www.analog.com/processors/resources/crosscore/visualDspDevSoftware.html
*/
/* void *memchr(const void *s, int c, size_t n);
* R0 = address (s)
* R1 = sought byte (c)
* R2 = count (n)
*
* Returns pointer to located character.
*/
.text
.align 2
.global _memchr
.type _memchr, STT_FUNC
_memchr:
P0 = R0; // P0 = address
P2 = R2; // P2 = count
R1 = R1.B(Z);
CC = R2 == 0;
IF CC JUMP failed;
bytes:
LSETUP (byte_loop_s , byte_loop_e) LC0=P2;
byte_loop_s:
R3 = B[P0++](Z);
CC = R3 == R1;
IF CC JUMP found;
NOP;
byte_loop_e:
failed:
R0=0;
RTS;
found:
R0 = P0;
R0 += -1;
RTS;
.size _memchr,.-_memchr
libc_hidden_def (memchr)
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