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