2010-08-27 05:09:34 +00:00
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/* strlen without BSF
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Copyright (C) 2010 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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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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#if defined SHARED && !defined NOT_IN_libc
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#include <sysdep.h>
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2010-08-27 05:17:03 +00:00
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.section .text.slow,"ax",@progbits
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2010-08-27 05:09:34 +00:00
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ENTRY (__strlen_no_bsf)
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xor %eax, %eax
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cmpb $0, (%rdi)
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jz L(exit_tail0)
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cmpb $0, 1(%rdi)
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jz L(exit_tail1)
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cmpb $0, 2(%rdi)
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jz L(exit_tail2)
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cmpb $0, 3(%rdi)
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jz L(exit_tail3)
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cmpb $0, 4(%rdi)
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jz L(exit_tail4)
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cmpb $0, 5(%rdi)
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jz L(exit_tail5)
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cmpb $0, 6(%rdi)
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jz L(exit_tail6)
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cmpb $0, 7(%rdi)
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jz L(exit_tail7)
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cmpb $0, 8(%rdi)
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jz L(exit_tail8)
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cmpb $0, 9(%rdi)
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jz L(exit_tail9)
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cmpb $0, 10(%rdi)
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jz L(exit_tail10)
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cmpb $0, 11(%rdi)
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jz L(exit_tail11)
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cmpb $0, 12(%rdi)
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jz L(exit_tail12)
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cmpb $0, 13(%rdi)
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jz L(exit_tail13)
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cmpb $0, 14(%rdi)
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jz L(exit_tail14)
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cmpb $0, 15(%rdi)
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jz L(exit_tail15)
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pxor %xmm0, %xmm0
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mov %rdi, %rcx
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mov %rdi, %rax
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and $-16, %rax
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add $16, %rax
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add $16, %rcx
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pcmpeqb (%rax), %xmm0
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pmovmskb %xmm0, %edx
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pxor %xmm1, %xmm1
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test %edx, %edx
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lea 16(%rax), %rax
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jnz L(exit)
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pcmpeqb (%rax), %xmm1
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pmovmskb %xmm1, %edx
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pxor %xmm2, %xmm2
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test %edx, %edx
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lea 16(%rax), %rax
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jnz L(exit)
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pcmpeqb (%rax), %xmm2
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pmovmskb %xmm2, %edx
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pxor %xmm3, %xmm3
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test %edx, %edx
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lea 16(%rax), %rax
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jnz L(exit)
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pcmpeqb (%rax), %xmm3
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pmovmskb %xmm3, %edx
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test %edx, %edx
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lea 16(%rax), %rax
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jnz L(exit)
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pcmpeqb (%rax), %xmm0
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pmovmskb %xmm0, %edx
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test %edx, %edx
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lea 16(%rax), %rax
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jnz L(exit)
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pcmpeqb (%rax), %xmm1
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pmovmskb %xmm1, %edx
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test %edx, %edx
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lea 16(%rax), %rax
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jnz L(exit)
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pcmpeqb (%rax), %xmm2
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pmovmskb %xmm2, %edx
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test %edx, %edx
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lea 16(%rax), %rax
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jnz L(exit)
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pcmpeqb (%rax), %xmm3
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pmovmskb %xmm3, %edx
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test %edx, %edx
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lea 16(%rax), %rax
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jnz L(exit)
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pcmpeqb (%rax), %xmm0
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pmovmskb %xmm0, %edx
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test %edx, %edx
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lea 16(%rax), %rax
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jnz L(exit)
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pcmpeqb (%rax), %xmm1
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pmovmskb %xmm1, %edx
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test %edx, %edx
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lea 16(%rax), %rax
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jnz L(exit)
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pcmpeqb (%rax), %xmm2
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pmovmskb %xmm2, %edx
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test %edx, %edx
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lea 16(%rax), %rax
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jnz L(exit)
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pcmpeqb (%rax), %xmm3
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pmovmskb %xmm3, %edx
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test %edx, %edx
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lea 16(%rax), %rax
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jnz L(exit)
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pcmpeqb (%rax), %xmm0
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pmovmskb %xmm0, %edx
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test %edx, %edx
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lea 16(%rax), %rax
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jnz L(exit)
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pcmpeqb (%rax), %xmm1
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pmovmskb %xmm1, %edx
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test %edx, %edx
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lea 16(%rax), %rax
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jnz L(exit)
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pcmpeqb (%rax), %xmm2
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pmovmskb %xmm2, %edx
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test %edx, %edx
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lea 16(%rax), %rax
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jnz L(exit)
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pcmpeqb (%rax), %xmm3
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pmovmskb %xmm3, %edx
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test %edx, %edx
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lea 16(%rax), %rax
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jnz L(exit)
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and $-0x40, %rax
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xor %r8d, %r8d
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L(aligned_64):
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pcmpeqb (%rax), %xmm0
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pcmpeqb 16(%rax), %xmm1
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pcmpeqb 32(%rax), %xmm2
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pcmpeqb 48(%rax), %xmm3
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pmovmskb %xmm0, %edx
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pmovmskb %xmm1, %esi
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pmovmskb %xmm2, %edi
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pmovmskb %xmm3, %r9d
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or %edx, %r8d
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or %esi, %r8d
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or %edi, %r8d
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or %r9d, %r8d
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lea 64(%rax), %rax
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jz L(aligned_64)
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test %edx, %edx
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jnz L(aligned_64_exit_16)
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test %esi, %esi
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jnz L(aligned_64_exit_32)
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test %edi, %edi
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jnz L(aligned_64_exit_48)
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L(aligned_64_exit_64):
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mov %r9d, %edx
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jmp L(aligned_64_exit)
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L(aligned_64_exit_48):
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lea -16(%rax), %rax
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mov %edi, %edx
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jmp L(aligned_64_exit)
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L(aligned_64_exit_32):
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lea -32(%rax), %rax
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mov %esi, %edx
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jmp L(aligned_64_exit)
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L(aligned_64_exit_16):
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lea -48(%rax), %rax
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L(aligned_64_exit):
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L(exit):
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sub %rcx, %rax
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test %dl, %dl
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jz L(exit_high)
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test $0x01, %dl
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jnz L(exit_tail0)
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test $0x02, %dl
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jnz L(exit_tail1)
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test $0x04, %dl
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jnz L(exit_tail2)
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test $0x08, %dl
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jnz L(exit_tail3)
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test $0x10, %dl
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jnz L(exit_tail4)
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test $0x20, %dl
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jnz L(exit_tail5)
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test $0x40, %dl
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jnz L(exit_tail6)
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add $7, %eax
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L(exit_tail0):
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ret
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L(exit_high):
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add $8, %eax
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test $0x01, %dh
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jnz L(exit_tail0)
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test $0x02, %dh
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jnz L(exit_tail1)
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test $0x04, %dh
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jnz L(exit_tail2)
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test $0x08, %dh
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jnz L(exit_tail3)
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test $0x10, %dh
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jnz L(exit_tail4)
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test $0x20, %dh
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jnz L(exit_tail5)
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test $0x40, %dh
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jnz L(exit_tail6)
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add $7, %eax
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ret
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.p2align 4
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L(exit_tail1):
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add $1, %eax
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ret
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L(exit_tail2):
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add $2, %eax
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ret
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L(exit_tail3):
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add $3, %eax
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ret
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L(exit_tail4):
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add $4, %eax
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ret
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L(exit_tail5):
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add $5, %eax
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ret
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L(exit_tail6):
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add $6, %eax
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ret
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L(exit_tail7):
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add $7, %eax
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ret
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L(exit_tail8):
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add $8, %eax
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ret
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L(exit_tail9):
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add $9, %eax
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ret
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L(exit_tail10):
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add $10, %eax
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ret
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L(exit_tail11):
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add $11, %eax
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ret
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L(exit_tail12):
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add $12, %eax
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ret
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L(exit_tail13):
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add $13, %eax
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ret
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L(exit_tail14):
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add $14, %eax
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ret
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L(exit_tail15):
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add $15, %eax
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ret
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END (__strlen_no_bsf)
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#endif
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