| /* strlen without BSF |
| Copyright (C) 2010 Free Software Foundation, Inc. |
| Contributed by Intel Corporation. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #if defined SHARED && !defined NOT_IN_libc |
| |
| #include <sysdep.h> |
| |
| .section .text.slow,"ax",@progbits |
| ENTRY (__strlen_no_bsf) |
| xor %eax, %eax |
| cmpb $0, (%rdi) |
| jz L(exit_tail0) |
| cmpb $0, 1(%rdi) |
| jz L(exit_tail1) |
| cmpb $0, 2(%rdi) |
| jz L(exit_tail2) |
| cmpb $0, 3(%rdi) |
| jz L(exit_tail3) |
| cmpb $0, 4(%rdi) |
| jz L(exit_tail4) |
| cmpb $0, 5(%rdi) |
| jz L(exit_tail5) |
| cmpb $0, 6(%rdi) |
| jz L(exit_tail6) |
| cmpb $0, 7(%rdi) |
| jz L(exit_tail7) |
| cmpb $0, 8(%rdi) |
| jz L(exit_tail8) |
| cmpb $0, 9(%rdi) |
| jz L(exit_tail9) |
| cmpb $0, 10(%rdi) |
| jz L(exit_tail10) |
| cmpb $0, 11(%rdi) |
| jz L(exit_tail11) |
| cmpb $0, 12(%rdi) |
| jz L(exit_tail12) |
| cmpb $0, 13(%rdi) |
| jz L(exit_tail13) |
| cmpb $0, 14(%rdi) |
| jz L(exit_tail14) |
| cmpb $0, 15(%rdi) |
| jz L(exit_tail15) |
| pxor %xmm0, %xmm0 |
| mov %rdi, %rcx |
| mov %rdi, %rax |
| and $-16, %rax |
| add $16, %rax |
| add $16, %rcx |
| |
| pcmpeqb (%rax), %xmm0 |
| pmovmskb %xmm0, %edx |
| pxor %xmm1, %xmm1 |
| test %edx, %edx |
| lea 16(%rax), %rax |
| jnz L(exit) |
| |
| pcmpeqb (%rax), %xmm1 |
| pmovmskb %xmm1, %edx |
| pxor %xmm2, %xmm2 |
| test %edx, %edx |
| lea 16(%rax), %rax |
| jnz L(exit) |
| |
| |
| pcmpeqb (%rax), %xmm2 |
| pmovmskb %xmm2, %edx |
| pxor %xmm3, %xmm3 |
| test %edx, %edx |
| lea 16(%rax), %rax |
| jnz L(exit) |
| |
| pcmpeqb (%rax), %xmm3 |
| pmovmskb %xmm3, %edx |
| test %edx, %edx |
| lea 16(%rax), %rax |
| jnz L(exit) |
| |
| pcmpeqb (%rax), %xmm0 |
| pmovmskb %xmm0, %edx |
| test %edx, %edx |
| lea 16(%rax), %rax |
| jnz L(exit) |
| |
| pcmpeqb (%rax), %xmm1 |
| pmovmskb %xmm1, %edx |
| test %edx, %edx |
| lea 16(%rax), %rax |
| jnz L(exit) |
| |
| pcmpeqb (%rax), %xmm2 |
| pmovmskb %xmm2, %edx |
| test %edx, %edx |
| lea 16(%rax), %rax |
| jnz L(exit) |
| |
| pcmpeqb (%rax), %xmm3 |
| pmovmskb %xmm3, %edx |
| test %edx, %edx |
| lea 16(%rax), %rax |
| jnz L(exit) |
| |
| pcmpeqb (%rax), %xmm0 |
| pmovmskb %xmm0, %edx |
| test %edx, %edx |
| lea 16(%rax), %rax |
| jnz L(exit) |
| |
| pcmpeqb (%rax), %xmm1 |
| pmovmskb %xmm1, %edx |
| test %edx, %edx |
| lea 16(%rax), %rax |
| jnz L(exit) |
| |
| pcmpeqb (%rax), %xmm2 |
| pmovmskb %xmm2, %edx |
| test %edx, %edx |
| lea 16(%rax), %rax |
| jnz L(exit) |
| |
| pcmpeqb (%rax), %xmm3 |
| pmovmskb %xmm3, %edx |
| test %edx, %edx |
| lea 16(%rax), %rax |
| jnz L(exit) |
| |
| pcmpeqb (%rax), %xmm0 |
| pmovmskb %xmm0, %edx |
| test %edx, %edx |
| lea 16(%rax), %rax |
| jnz L(exit) |
| |
| pcmpeqb (%rax), %xmm1 |
| pmovmskb %xmm1, %edx |
| test %edx, %edx |
| lea 16(%rax), %rax |
| jnz L(exit) |
| |
| pcmpeqb (%rax), %xmm2 |
| pmovmskb %xmm2, %edx |
| test %edx, %edx |
| lea 16(%rax), %rax |
| jnz L(exit) |
| |
| pcmpeqb (%rax), %xmm3 |
| pmovmskb %xmm3, %edx |
| test %edx, %edx |
| lea 16(%rax), %rax |
| jnz L(exit) |
| |
| and $-0x40, %rax |
| xor %r8d, %r8d |
| L(aligned_64): |
| pcmpeqb (%rax), %xmm0 |
| pcmpeqb 16(%rax), %xmm1 |
| pcmpeqb 32(%rax), %xmm2 |
| pcmpeqb 48(%rax), %xmm3 |
| pmovmskb %xmm0, %edx |
| pmovmskb %xmm1, %esi |
| pmovmskb %xmm2, %edi |
| pmovmskb %xmm3, %r9d |
| or %edx, %r8d |
| or %esi, %r8d |
| or %edi, %r8d |
| or %r9d, %r8d |
| lea 64(%rax), %rax |
| jz L(aligned_64) |
| |
| test %edx, %edx |
| jnz L(aligned_64_exit_16) |
| test %esi, %esi |
| jnz L(aligned_64_exit_32) |
| test %edi, %edi |
| jnz L(aligned_64_exit_48) |
| L(aligned_64_exit_64): |
| mov %r9d, %edx |
| jmp L(aligned_64_exit) |
| L(aligned_64_exit_48): |
| lea -16(%rax), %rax |
| mov %edi, %edx |
| jmp L(aligned_64_exit) |
| L(aligned_64_exit_32): |
| lea -32(%rax), %rax |
| mov %esi, %edx |
| jmp L(aligned_64_exit) |
| L(aligned_64_exit_16): |
| lea -48(%rax), %rax |
| L(aligned_64_exit): |
| L(exit): |
| sub %rcx, %rax |
| test %dl, %dl |
| jz L(exit_high) |
| test $0x01, %dl |
| jnz L(exit_tail0) |
| |
| test $0x02, %dl |
| jnz L(exit_tail1) |
| |
| test $0x04, %dl |
| jnz L(exit_tail2) |
| |
| test $0x08, %dl |
| jnz L(exit_tail3) |
| |
| test $0x10, %dl |
| jnz L(exit_tail4) |
| |
| test $0x20, %dl |
| jnz L(exit_tail5) |
| |
| test $0x40, %dl |
| jnz L(exit_tail6) |
| add $7, %eax |
| L(exit_tail0): |
| ret |
| |
| L(exit_high): |
| add $8, %eax |
| test $0x01, %dh |
| jnz L(exit_tail0) |
| |
| test $0x02, %dh |
| jnz L(exit_tail1) |
| |
| test $0x04, %dh |
| jnz L(exit_tail2) |
| |
| test $0x08, %dh |
| jnz L(exit_tail3) |
| |
| test $0x10, %dh |
| jnz L(exit_tail4) |
| |
| test $0x20, %dh |
| jnz L(exit_tail5) |
| |
| test $0x40, %dh |
| jnz L(exit_tail6) |
| add $7, %eax |
| ret |
| .p2align 4 |
| L(exit_tail1): |
| add $1, %eax |
| ret |
| |
| L(exit_tail2): |
| add $2, %eax |
| ret |
| |
| L(exit_tail3): |
| add $3, %eax |
| ret |
| |
| L(exit_tail4): |
| add $4, %eax |
| ret |
| |
| L(exit_tail5): |
| add $5, %eax |
| ret |
| L(exit_tail6): |
| add $6, %eax |
| ret |
| L(exit_tail7): |
| add $7, %eax |
| ret |
| L(exit_tail8): |
| add $8, %eax |
| ret |
| L(exit_tail9): |
| add $9, %eax |
| ret |
| L(exit_tail10): |
| add $10, %eax |
| ret |
| L(exit_tail11): |
| add $11, %eax |
| ret |
| L(exit_tail12): |
| add $12, %eax |
| ret |
| L(exit_tail13): |
| add $13, %eax |
| ret |
| L(exit_tail14): |
| add $14, %eax |
| ret |
| L(exit_tail15): |
| add $15, %eax |
| ret |
| END (__strlen_no_bsf) |
| |
| #endif |
