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55 lines
1.5 KiB
ArmAsm
55 lines
1.5 KiB
ArmAsm
/* strlen(str) -- determine the length of the string STR.
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Copyright (C) 2009 Free Software Foundation, Inc.
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Contributed by Ulrich Drepper <drepper@redhat.com>.
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This file is part of the GNU C Library.
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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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.text
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ENTRY(strlen)
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movq %rdi, %rcx
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movq %rdi, %r8
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andq $~15, %rdi
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pxor %xmm1, %xmm1
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orl $0xffffffff, %esi
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movdqa (%rdi), %xmm0
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subq %rdi, %rcx
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leaq 16(%rdi), %rdi
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pcmpeqb %xmm1, %xmm0
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shl %cl, %esi
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pmovmskb %xmm0, %edx
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xorl %eax, %eax
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negq %r8
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andl %esi, %edx
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jnz 1f
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2: movdqa (%rdi), %xmm0
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leaq 16(%rdi), %rdi
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pcmpeqb %xmm1, %xmm0
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pmovmskb %xmm0, %edx
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testl %edx, %edx
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jz 2b
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1: leaq -16(%rdi,%r8), %rdi
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bsfl %edx, %eax
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addq %rdi, %rax
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ret
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END(strlen)
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libc_hidden_builtin_def (strlen)
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