/* memcopy.h -- definitions for memory copy functions. i386 version. Copyright (C) 1991-2018 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Torbjorn Granlund (tege@sics.se). 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 <sysdeps/generic/memcopy.h> #undef OP_T_THRES #define OP_T_THRES 8 #undef BYTE_COPY_FWD #define BYTE_COPY_FWD(dst_bp, src_bp, nbytes) \ do { \ int __d0; \ asm volatile(/* Clear the direction flag, so copying goes forward. */ \ "cld\n" \ /* Copy bytes. */ \ "rep\n" \ "movsb" : \ "=D" (dst_bp), "=S" (src_bp), "=c" (__d0) : \ "0" (dst_bp), "1" (src_bp), "2" (nbytes) : \ "memory"); \ } while (0) #undef BYTE_COPY_BWD #define BYTE_COPY_BWD(dst_ep, src_ep, nbytes) \ do \ { \ int __d0; \ asm volatile(/* Set the direction flag, so copying goes backwards. */ \ "std\n" \ /* Copy bytes. */ \ "rep\n" \ "movsb\n" \ /* Clear the dir flag. Convention says it should be 0. */ \ "cld" : \ "=D" (dst_ep), "=S" (src_ep), "=c" (__d0) : \ "0" (dst_ep - 1), "1" (src_ep - 1), "2" (nbytes) : \ "memory"); \ dst_ep += 1; \ src_ep += 1; \ } while (0) #undef WORD_COPY_FWD #define WORD_COPY_FWD(dst_bp, src_bp, nbytes_left, nbytes) \ do \ { \ int __d0; \ asm volatile(/* Clear the direction flag, so copying goes forward. */ \ "cld\n" \ /* Copy longwords. */ \ "rep\n" \ "movsl" : \ "=D" (dst_bp), "=S" (src_bp), "=c" (__d0) : \ "0" (dst_bp), "1" (src_bp), "2" ((nbytes) / 4) : \ "memory"); \ (nbytes_left) = (nbytes) % 4; \ } while (0) #undef WORD_COPY_BWD #define WORD_COPY_BWD(dst_ep, src_ep, nbytes_left, nbytes) \ do \ { \ int __d0; \ asm volatile(/* Set the direction flag, so copying goes backwards. */ \ "std\n" \ /* Copy longwords. */ \ "rep\n" \ "movsl\n" \ /* Clear the dir flag. Convention says it should be 0. */ \ "cld" : \ "=D" (dst_ep), "=S" (src_ep), "=c" (__d0) : \ "0" (dst_ep - 4), "1" (src_ep - 4), "2" ((nbytes) / 4) : \ "memory"); \ dst_ep += 4; \ src_ep += 4; \ (nbytes_left) = (nbytes) % 4; \ } while (0)