sysdeps/x86_64/memset.S

   1 /* memset/bzero -- set memory area to CH/0
   2    Optimized version for x86-64.
   3    Copyright (C) 2002-2017 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <sysdep.h>
  21
  22 #define VEC_SIZE        16
  23 #define VEC(i)          xmm##i
  24 /* Don't use movups and movaps since it will get larger nop paddings for
  25    alignment.  */
  26 #define VMOVU           movdqu
  27 #define VMOVA           movdqa
  28
  29 #define MEMSET_VDUP_TO_VEC0_AND_SET_RETURN(d, r) \
  30   movd d, %xmm0; \
  31   movq r, %rax; \
  32   punpcklbw %xmm0, %xmm0; \
  33   punpcklwd %xmm0, %xmm0; \
  34   pshufd $0, %xmm0, %xmm0
  35
  36 #define WMEMSET_VDUP_TO_VEC0_AND_SET_RETURN(d, r) \
  37   movd d, %xmm0; \
  38   movq r, %rax; \
  39   pshufd $0, %xmm0, %xmm0
  40
  41 #define SECTION(p)              p
  42
  43 #ifndef MEMSET_SYMBOL
  44 # define MEMSET_CHK_SYMBOL(p,s) p
  45 # define MEMSET_SYMBOL(p,s)     memset
  46 #endif
  47
  48 #ifndef WMEMSET_SYMBOL
  49 # define WMEMSET_CHK_SYMBOL(p,s) p
  50 # define WMEMSET_SYMBOL(p,s)    __wmemset
  51 #endif
  52
  53 #include "multiarch/memset-vec-unaligned-erms.S"
  54
  55 libc_hidden_builtin_def (memset)
  56
  57 #if IS_IN (libc)
  58 libc_hidden_def (__wmemset)
  59 weak_alias (__wmemset, wmemset)
  60 libc_hidden_weak (wmemset)
  61 #endif