diff options
Diffstat (limited to 'sysdeps/i386/i686/multiarch/strcpy-stosb.S')
-rw-r--r-- | sysdeps/i386/i686/multiarch/strcpy-stosb.S | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/sysdeps/i386/i686/multiarch/strcpy-stosb.S b/sysdeps/i386/i686/multiarch/strcpy-stosb.S new file mode 100644 index 0000000000..36e4412fad --- /dev/null +++ b/sysdeps/i386/i686/multiarch/strcpy-stosb.S @@ -0,0 +1,66 @@ +/* strcpy/strcpy optimized with stosb. + All versions must be listed in ifunc-impl-list.c. + Copyright (C) 2017 Free Software Foundation, Inc. + 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, see + <http://www.gnu.org/licenses/>. */ + +#include <sysdep.h> + +#define PARMS 4+8 /* space for 2 saved regs */ +#define DEST PARMS +#define SRC DEST+4 + +#ifndef USE_AS_STPCPY +# define STRCPY __strcpy_stosb +#endif + + .text +ENTRY (STRCPY) + pushl %edi + cfi_adjust_cfa_offset (4) + cfi_rel_offset (%edi, 4) + pushl %esi + cfi_adjust_cfa_offset (4) + cfi_rel_offset (%esi, 0) + + movl DEST(%esp), %edi + movl SRC(%esp), %esi + +#ifndef USE_AS_STPCPY + movl %edi, %edx +#endif + +L(repeat): + lodsb + stosb + testb %al,%al + jne L(repeat) + +#ifdef USE_AS_STPCPY + leal -1(%edi), %eax +#else + movl %edx, %eax +#endif + + popl %esi + cfi_adjust_cfa_offset (-4) + cfi_restore (%esi) + popl %edi + cfi_adjust_cfa_offset (-4) + cfi_restore (%edi) + + ret +END (STRCPY) |