2009-10-23 05:47:12 +00:00
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/* Return the pointer to the end of string, using SSE4.2
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Copyright (C) 2009 Free Software Foundation, Inc.
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Contributed by Intel Corporation.
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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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2012-02-09 23:18:22 +00:00
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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2009-10-23 05:47:12 +00:00
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#include <sysdep.h>
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#include "asm-syntax.h"
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.section .text.sse4.2,"ax",@progbits
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ENTRY (__strend_sse4)
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pxor %xmm2, %xmm2
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movq %rdi, %rcx
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andq $~15, %rdi
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movdqa %xmm2, %xmm1
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pcmpeqb (%rdi), %xmm2
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orl $0xffffffff, %esi
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subq %rdi, %rcx
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shll %cl, %esi
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pmovmskb %xmm2, %edx
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andl %esi, %edx
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jnz 1f
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2: pcmpistri $0x08, 16(%rdi), %xmm1
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leaq 16(%rdi), %rdi
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jnz 2b
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leaq (%rdi,%rcx), %rax
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ret
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1: bsfl %edx, %eax
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addq %rdi, %rax
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ret
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END (__strend_sse4)
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