diff options
Diffstat (limited to 'arch/arc/lib/strlen.S')
| -rw-r--r-- | arch/arc/lib/strlen.S | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/arch/arc/lib/strlen.S b/arch/arc/lib/strlen.S new file mode 100644 index 0000000..666e22c --- /dev/null +++ b/arch/arc/lib/strlen.S @@ -0,0 +1,80 @@ +/* + * Copyright (C) 2004, 2007-2010, 2011-2014 Synopsys, Inc. All rights reserved. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +.global strlen +.align 4 +strlen: + or %r3, %r0, 7 + ld %r2, [%r3, -7] + ld.a %r6, [%r3, -3] + mov %r4, 0x01010101 + /* uses long immediate */ +#ifdef __LITTLE_ENDIAN__ + asl_s %r1, %r0, 3 + btst_s %r0, 2 + asl %r7, %r4, %r1 + ror %r5, %r4 + sub %r1, %r2, %r7 + bic_s %r1, %r1, %r2 + mov.eq %r7, %r4 + sub %r12, %r6, %r7 + bic %r12, %r12, %r6 + or.eq %r12, %r12, %r1 + and %r12, %r12, %r5 + brne %r12, 0, .Learly_end +#else /* __BIG_ENDIAN__ */ + ror %r5, %r4 + btst_s %r0, 2 + mov_s %r1, 31 + sub3 %r7, %r1, %r0 + sub %r1, %r2, %r4 + bic_s %r1, %r1, %r2 + bmsk %r1, %r1, %r7 + sub %r12, %r6, %r4 + bic %r12, %r12, %r6 + bmsk.ne %r12, %r12, %r7 + or.eq %r12, %r12, %r1 + and %r12, %r12, %r5 + brne %r12, 0, .Learly_end +#endif /* _ENDIAN__ */ + +.Loop: + ld_s %r2, [%r3, 4] + ld.a %r6, [%r3, 8] + /* stall for load result */ + sub %r1, %r2, %r4 + bic_s %r1, %r1, %r2 + sub %r12, %r6, %r4 + bic %r12, %r12, %r6 + or %r12, %r12, %r1 + and %r12, %r12, %r5 + breq %r12, 0, .Loop +.Lend: + and.f %r1, %r1, %r5 + sub.ne %r3, %r3, 4 + mov.eq %r1, %r12 +#ifdef __LITTLE_ENDIAN__ + sub_s %r2, %r1, 1 + bic_s %r2, %r2, %r1 + norm %r1, %r2 + sub_s %r0, %r0, 3 + lsr_s %r1, %r1, 3 + sub %r0, %r3, %r0 + j_s.d [%blink] + sub %r0, %r0, %r1 +#else /* __BIG_ENDIAN__ */ + lsr_s %r1, %r1, 7 + mov.eq %r2, %r6 + bic_s %r1, %r1, %r2 + norm %r1, %r1 + sub %r0, %r3, %r0 + lsr_s %r1, %r1, 3 + j_s.d [%blink] + add %r0, %r0, %r1 +#endif /* _ENDIAN */ +.Learly_end: + b.d .Lend + sub_s.ne %r1, %r1, %r1 |