diff options
Diffstat (limited to 'sysdeps/x86_64/multiarch/strlen-no-bsf.S')
| -rw-r--r-- | sysdeps/x86_64/multiarch/strlen-no-bsf.S | 309 |
1 files changed, 309 insertions, 0 deletions
diff --git a/sysdeps/x86_64/multiarch/strlen-no-bsf.S b/sysdeps/x86_64/multiarch/strlen-no-bsf.S new file mode 100644 index 0000000000..29ad8227b0 --- /dev/null +++ b/sysdeps/x86_64/multiarch/strlen-no-bsf.S @@ -0,0 +1,309 @@ +/* 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> + + .text +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 |