diff options
Diffstat (limited to 'sysdeps/x86_64/wcslen.S')
| -rw-r--r-- | sysdeps/x86_64/wcslen.S | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/sysdeps/x86_64/wcslen.S b/sysdeps/x86_64/wcslen.S new file mode 100644 index 0000000000..0343ac78d0 --- /dev/null +++ b/sysdeps/x86_64/wcslen.S @@ -0,0 +1,239 @@ +/* Optimized wcslen for x86-64 with SSE2. + Copyright (C) 2011 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. */ + +#include <sysdep.h> + + .text +ENTRY (__wcslen) + cmpl $0, (%rdi) + jz L(exit_tail0) + cmpl $0, 4(%rdi) + jz L(exit_tail1) + cmpl $0, 8(%rdi) + jz L(exit_tail2) + cmpl $0, 12(%rdi) + jz L(exit_tail3) + cmpl $0, 16(%rdi) + jz L(exit_tail4) + cmpl $0, 20(%rdi) + jz L(exit_tail5) + cmpl $0, 24(%rdi) + jz L(exit_tail6) + cmpl $0, 28(%rdi) + jz L(exit_tail7) + + pxor %xmm0, %xmm0 + + lea 32(%rdi), %rax + lea 16(%rdi), %rcx + and $-16, %rax + + pcmpeqd (%rax), %xmm0 + pmovmskb %xmm0, %edx + pxor %xmm1, %xmm1 + test %edx, %edx + lea 16(%rax), %rax + jnz L(exit) + + pcmpeqd (%rax), %xmm1 + pmovmskb %xmm1, %edx + pxor %xmm2, %xmm2 + test %edx, %edx + lea 16(%rax), %rax + jnz L(exit) + + pcmpeqd (%rax), %xmm2 + pmovmskb %xmm2, %edx + pxor %xmm3, %xmm3 + test %edx, %edx + lea 16(%rax), %rax + jnz L(exit) + + pcmpeqd (%rax), %xmm3 + pmovmskb %xmm3, %edx + test %edx, %edx + lea 16(%rax), %rax + jnz L(exit) + + pcmpeqd (%rax), %xmm0 + pmovmskb %xmm0, %edx + test %edx, %edx + lea 16(%rax), %rax + jnz L(exit) + + pcmpeqd (%rax), %xmm1 + pmovmskb %xmm1, %edx + test %edx, %edx + lea 16(%rax), %rax + jnz L(exit) + + pcmpeqd (%rax), %xmm2 + pmovmskb %xmm2, %edx + test %edx, %edx + lea 16(%rax), %rax + jnz L(exit) + + pcmpeqd (%rax), %xmm3 + pmovmskb %xmm3, %edx + test %edx, %edx + lea 16(%rax), %rax + jnz L(exit) + + pcmpeqd (%rax), %xmm0 + pmovmskb %xmm0, %edx + test %edx, %edx + lea 16(%rax), %rax + jnz L(exit) + + pcmpeqd (%rax), %xmm1 + pmovmskb %xmm1, %edx + test %edx, %edx + lea 16(%rax), %rax + jnz L(exit) + + pcmpeqd (%rax), %xmm2 + pmovmskb %xmm2, %edx + test %edx, %edx + lea 16(%rax), %rax + jnz L(exit) + + pcmpeqd (%rax), %xmm3 + pmovmskb %xmm3, %edx + test %edx, %edx + lea 16(%rax), %rax + jnz L(exit) + + and $-0x40, %rax + + .p2align 4 +L(aligned_64_loop): + movaps (%rax), %xmm0 + movaps 16(%rax), %xmm1 + movaps 32(%rax), %xmm2 + movaps 48(%rax), %xmm6 + + pminub %xmm1, %xmm0 + pminub %xmm6, %xmm2 + pminub %xmm0, %xmm2 + pcmpeqd %xmm3, %xmm2 + pmovmskb %xmm2, %edx + test %edx, %edx + lea 64(%rax), %rax + jz L(aligned_64_loop) + + pcmpeqd -64(%rax), %xmm3 + pmovmskb %xmm3, %edx + test %edx, %edx + lea 48(%rcx), %rcx + jnz L(exit) + + pcmpeqd %xmm1, %xmm3 + pmovmskb %xmm3, %edx + test %edx, %edx + lea -16(%rcx), %rcx + jnz L(exit) + + pcmpeqd -32(%rax), %xmm3 + pmovmskb %xmm3, %edx + test %edx, %edx + lea -16(%rcx), %rcx + jnz L(exit) + + pcmpeqd %xmm6, %xmm3 + pmovmskb %xmm3, %edx + test %edx, %edx + lea -16(%rcx), %rcx + jnz L(exit) + + jmp L(aligned_64_loop) + + .p2align 4 +L(exit): + sub %rcx, %rax + shr $2, %rax + test %dl, %dl + jz L(exit_high) + + mov %dl, %cl + and $15, %cl + jz L(exit_1) + ret + + .p2align 4 +L(exit_high): + mov %dh, %ch + and $15, %ch + jz L(exit_3) + add $2, %rax + ret + + .p2align 4 +L(exit_1): + add $1, %rax + ret + + .p2align 4 +L(exit_3): + add $3, %rax + ret + + .p2align 4 +L(exit_tail0): + xor %rax, %rax + ret + + .p2align 4 +L(exit_tail1): + mov $1, %rax + ret + + .p2align 4 +L(exit_tail2): + mov $2, %rax + ret + + .p2align 4 +L(exit_tail3): + mov $3, %rax + ret + + .p2align 4 +L(exit_tail4): + mov $4, %rax + ret + + .p2align 4 +L(exit_tail5): + mov $5, %rax + ret + + .p2align 4 +L(exit_tail6): + mov $6, %rax + ret + + .p2align 4 +L(exit_tail7): + mov $7, %rax + ret + +END (__wcslen) + +weak_alias(__wcslen, wcslen) |