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| /* SPDX-License-Identifier: GPL-2.0 */
| /* strlen.S: Sparc optimized strlen code
| * Hand optimized from GNU libc's strlen
| * Copyright (C) 1991,1996 Free Software Foundation
| * Copyright (C) 1996,2008 David S. Miller (davem@davemloft.net)
| * Copyright (C) 1996, 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
| */
|
| #include <linux/linkage.h>
| #include <asm/asm.h>
| #include <asm/export.h>
|
| #define LO_MAGIC 0x01010101
| #define HI_MAGIC 0x80808080
|
| .text
| ENTRY(strlen)
| mov %o0, %o1
| andcc %o0, 3, %g0
| BRANCH32(be, pt, 9f)
| sethi %hi(HI_MAGIC), %o4
| ldub [%o0], %o5
| BRANCH_REG_ZERO(pn, %o5, 11f)
| add %o0, 1, %o0
| andcc %o0, 3, %g0
| BRANCH32(be, pn, 4f)
| or %o4, %lo(HI_MAGIC), %o3
| ldub [%o0], %o5
| BRANCH_REG_ZERO(pn, %o5, 12f)
| add %o0, 1, %o0
| andcc %o0, 3, %g0
| BRANCH32(be, pt, 5f)
| sethi %hi(LO_MAGIC), %o4
| ldub [%o0], %o5
| BRANCH_REG_ZERO(pn, %o5, 13f)
| add %o0, 1, %o0
| BRANCH32(ba, pt, 8f)
| or %o4, %lo(LO_MAGIC), %o2
| 9:
| or %o4, %lo(HI_MAGIC), %o3
| 4:
| sethi %hi(LO_MAGIC), %o4
| 5:
| or %o4, %lo(LO_MAGIC), %o2
| 8:
| ld [%o0], %o5
| 2:
| sub %o5, %o2, %o4
| andcc %o4, %o3, %g0
| BRANCH32(be, pt, 8b)
| add %o0, 4, %o0
|
| /* Check every byte. */
| srl %o5, 24, %g7
| andcc %g7, 0xff, %g0
| BRANCH32(be, pn, 1f)
| add %o0, -4, %o4
| srl %o5, 16, %g7
| andcc %g7, 0xff, %g0
| BRANCH32(be, pn, 1f)
| add %o4, 1, %o4
| srl %o5, 8, %g7
| andcc %g7, 0xff, %g0
| BRANCH32(be, pn, 1f)
| add %o4, 1, %o4
| andcc %o5, 0xff, %g0
| BRANCH32_ANNUL(bne, pt, 2b)
| ld [%o0], %o5
| add %o4, 1, %o4
| 1:
| retl
| sub %o4, %o1, %o0
| 11:
| retl
| mov 0, %o0
| 12:
| retl
| mov 1, %o0
| 13:
| retl
| mov 2, %o0
| ENDPROC(strlen)
| EXPORT_SYMBOL(strlen)
|
|
