diff options
Diffstat (limited to 'libc/string/avr32/strlen.S')
| -rw-r--r-- | libc/string/avr32/strlen.S | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/libc/string/avr32/strlen.S b/libc/string/avr32/strlen.S new file mode 100644 index 000000000..d2808998d --- /dev/null +++ b/libc/string/avr32/strlen.S @@ -0,0 +1,62 @@ +/* + * 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 str r12 + + .text + .global strlen + .type strlen, @function +strlen: + mov r11, r12 + + mov r9, str + andl r9, 3, COH + brne .Lunaligned_str + +1: ld.w r8, str++ + tnbz r8 + brne 1b + + sub r12, r11 + bfextu r9, r8, 24, 8 + cp.w r9, 0 + subeq r12, 4 + reteq r12 + bfextu r9, r8, 16, 8 + cp.w r9, 0 + subeq r12, 3 + reteq r12 + bfextu r9, r8, 8, 8 + cp.w r9, 0 + subeq r12, 2 + reteq r12 + sub r12, 1 + retal r12 + +.Lunaligned_str: + add pc, pc, r9 << 3 + sub r0, r0, 0 /* 4-byte nop */ + ld.ub r8, str++ + sub r8, r8, 0 + breq 1f + ld.ub r8, str++ + sub r8, r8, 0 + breq 1f + ld.ub r8, str++ + sub r8, r8, 0 + brne 1b + +1: sub r12, 1 + sub r12, r11 + retal r12 + + .size strlen, . - strlen + +libc_hidden_def(strlen) |