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87 lines
2.0 KiB
ArmAsm
87 lines
2.0 KiB
ArmAsm
/* Determine the length of a string. For SPARC v9.
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Copyright (C) 1998, 1999, 2003, 2010 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Jan Vondrak <jvon4518@ss1000.ms.mff.cuni.cz>,
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Jakub Jelinek <jj@ultra.linux.cz>, and
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David S. Miller <davem@davemloft.net>.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <sysdep.h>
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.register %g2, #scratch
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.register %g3, #scratch
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.text
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.align 32
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ENTRY(strlen)
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mov %o0, %o1
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andn %o0, 0x7, %o0
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ldx [%o0], %o5
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and %o1, 0x7, %g1
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mov -1, %g5
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sethi %hi(0x01010101), %o2
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sll %g1, 3, %g1
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or %o2, %lo(0x01010101), %o2
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srlx %g5, %g1, %o3
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sllx %o2, 32, %g1
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sethi %hi(0x0000ff00), %g5
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orn %o5, %o3, %o5
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or %o2, %g1, %o2
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sllx %o2, 7, %o3
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10: add %o0, 8, %o0
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andn %o3, %o5, %g1
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sub %o5, %o2, %g2
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andcc %g1, %g2, %g0
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be,a,pt %xcc, 10b
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ldx [%o0], %o5
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srlx %o5, 32, %g1
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andn %o3, %g1, %o4
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sub %g1, %o2, %g2
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add %o0, 4, %g3
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andcc %o4, %g2, %g0
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movne %icc, %g1, %o5
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move %icc, %g3, %o0
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or %g5, %lo(0x0000ff00), %g5
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mov 3 - 8, %g2
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andcc %o5, %g5, %g0
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srlx %o5, 16, %g1
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move %icc, 2 - 8, %g2
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andcc %g1, 0xff, %g0
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srl %o5, 24, %o5
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move %icc, 1 - 8, %g2
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movrz %o5, 0 - 8, %g2
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sub %o0, %o1, %o0
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retl
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add %o0, %g2, %o0
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END(strlen)
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libc_hidden_builtin_def (strlen)
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