diff options
Diffstat (limited to 'arch/sparc/lib/strlen.S')
| -rw-r--r-- | arch/sparc/lib/strlen.S | 79 |
1 files changed, 39 insertions, 40 deletions
diff --git a/arch/sparc/lib/strlen.S b/arch/sparc/lib/strlen.S index ed9a763368c..536f83507fb 100644 --- a/arch/sparc/lib/strlen.S +++ b/arch/sparc/lib/strlen.S @@ -1,51 +1,40 @@ /* strlen.S: Sparc optimized strlen code * Hand optimized from GNU libc's strlen * Copyright (C) 1991,1996 Free Software Foundation - * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) - * Copyright (C) 1996 Jakub Jelinek (jj@sunsite.mff.cuni.cz) + * 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> + #define LO_MAGIC 0x01010101 #define HI_MAGIC 0x80808080 -0: + .text +ENTRY(strlen) + mov %o0, %o1 + andcc %o0, 3, %g0 + BRANCH32(be, pt, 9f) + sethi %hi(HI_MAGIC), %o4 ldub [%o0], %o5 - cmp %o5, 0 - be 1f + BRANCH_REG_ZERO(pn, %o5, 11f) add %o0, 1, %o0 andcc %o0, 3, %g0 - be 4f + BRANCH32(be, pn, 4f) or %o4, %lo(HI_MAGIC), %o3 ldub [%o0], %o5 - cmp %o5, 0 - be 2f + BRANCH_REG_ZERO(pn, %o5, 12f) add %o0, 1, %o0 andcc %o0, 3, %g0 - be 5f + BRANCH32(be, pt, 5f) sethi %hi(LO_MAGIC), %o4 ldub [%o0], %o5 - cmp %o5, 0 - be 3f + BRANCH_REG_ZERO(pn, %o5, 13f) add %o0, 1, %o0 - b 8f + BRANCH32(ba, pt, 8f) or %o4, %lo(LO_MAGIC), %o2 -1: - retl - mov 0, %o0 -2: - retl - mov 1, %o0 -3: - retl - mov 2, %o0 - - .align 4 - .global strlen -strlen: - mov %o0, %o1 - andcc %o0, 3, %g0 - bne 0b - sethi %hi(HI_MAGIC), %o4 +9: or %o4, %lo(HI_MAGIC), %o3 4: sethi %hi(LO_MAGIC), %o4 @@ -56,26 +45,36 @@ strlen: 2: sub %o5, %o2, %o4 andcc %o4, %o3, %g0 - be 8b + BRANCH32(be, pt, 8b) add %o0, 4, %o0 /* Check every byte. */ - srl %o5, 24, %g5 - andcc %g5, 0xff, %g0 - be 1f + srl %o5, 24, %g7 + andcc %g7, 0xff, %g0 + BRANCH32(be, pn, 1f) add %o0, -4, %o4 - srl %o5, 16, %g5 - andcc %g5, 0xff, %g0 - be 1f + srl %o5, 16, %g7 + andcc %g7, 0xff, %g0 + BRANCH32(be, pn, 1f) add %o4, 1, %o4 - srl %o5, 8, %g5 - andcc %g5, 0xff, %g0 - be 1f + srl %o5, 8, %g7 + andcc %g7, 0xff, %g0 + BRANCH32(be, pn, 1f) add %o4, 1, %o4 andcc %o5, 0xff, %g0 - bne,a 2b + 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) |