404 lines
8.5 KiB
C
404 lines
8.5 KiB
C
/*
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* memcopy.c -- subroutines for memory copy functions.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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* Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* The code is derived from the GNU C Library.
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* Copyright (C) 1991, 1992, 1993, 1997, 2004 Free Software Foundation, Inc.
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*/
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/* BE VERY CAREFUL IF YOU CHANGE THIS CODE...! */
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#include <linux/memcopy.h>
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/*
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* _wordcopy_fwd_aligned -- Copy block beginning at SRCP to block beginning
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* at DSTP with LEN `op_t' words (not LEN bytes!).
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* Both SRCP and DSTP should be aligned for memory operations on `op_t's.
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*/
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void _wordcopy_fwd_aligned (long int dstp, long int srcp, size_t len)
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{
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op_t a0, a1;
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switch (len % 8) {
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case 2:
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a0 = ((op_t *) srcp)[0];
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srcp -= 6 * OPSIZ;
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dstp -= 7 * OPSIZ;
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len += 6;
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goto do1;
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case 3:
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a1 = ((op_t *) srcp)[0];
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srcp -= 5 * OPSIZ;
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dstp -= 6 * OPSIZ;
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len += 5;
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goto do2;
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case 4:
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a0 = ((op_t *) srcp)[0];
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srcp -= 4 * OPSIZ;
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dstp -= 5 * OPSIZ;
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len += 4;
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goto do3;
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case 5:
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a1 = ((op_t *) srcp)[0];
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srcp -= 3 * OPSIZ;
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dstp -= 4 * OPSIZ;
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len += 3;
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goto do4;
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case 6:
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a0 = ((op_t *) srcp)[0];
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srcp -= 2 * OPSIZ;
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dstp -= 3 * OPSIZ;
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len += 2;
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goto do5;
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case 7:
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a1 = ((op_t *) srcp)[0];
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srcp -= 1 * OPSIZ;
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dstp -= 2 * OPSIZ;
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len += 1;
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goto do6;
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case 0:
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if (OP_T_THRESHOLD <= 3 * OPSIZ && len == 0)
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return;
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a0 = ((op_t *) srcp)[0];
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srcp -= 0 * OPSIZ;
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dstp -= 1 * OPSIZ;
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goto do7;
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case 1:
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a1 = ((op_t *) srcp)[0];
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srcp -=-1 * OPSIZ;
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dstp -= 0 * OPSIZ;
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len -= 1;
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if (OP_T_THRESHOLD <= 3 * OPSIZ && len == 0)
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goto do0;
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goto do8; /* No-op. */
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}
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do {
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do8:
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a0 = ((op_t *) srcp)[0];
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((op_t *) dstp)[0] = a1;
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do7:
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a1 = ((op_t *) srcp)[1];
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((op_t *) dstp)[1] = a0;
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do6:
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a0 = ((op_t *) srcp)[2];
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((op_t *) dstp)[2] = a1;
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do5:
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a1 = ((op_t *) srcp)[3];
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((op_t *) dstp)[3] = a0;
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do4:
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a0 = ((op_t *) srcp)[4];
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((op_t *) dstp)[4] = a1;
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do3:
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a1 = ((op_t *) srcp)[5];
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((op_t *) dstp)[5] = a0;
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do2:
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a0 = ((op_t *) srcp)[6];
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((op_t *) dstp)[6] = a1;
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do1:
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a1 = ((op_t *) srcp)[7];
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((op_t *) dstp)[7] = a0;
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srcp += 8 * OPSIZ;
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dstp += 8 * OPSIZ;
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len -= 8;
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} while (len != 0);
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/*
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* This is the right position for do0. Please don't move it into
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* the loop.
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*/
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do0:
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((op_t *) dstp)[0] = a1;
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}
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/*
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* _wordcopy_fwd_dest_aligned -- Copy block beginning at SRCP to block
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* beginning at DSTP with LEN `op_t' words (not LEN bytes!). DSTP should
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* be aligned for memory operations on `op_t's, but SRCP must *not* be aligned.
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*/
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void _wordcopy_fwd_dest_aligned (long int dstp, long int srcp, size_t len)
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{
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op_t a0, a1, a2, a3;
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int sh_1, sh_2;
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/*
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* Calculate how to shift a word read at the memory operation aligned
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* srcp to make it aligned for copy.
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*/
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sh_1 = 8 * (srcp % OPSIZ);
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sh_2 = 8 * OPSIZ - sh_1;
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/*
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* Make SRCP aligned by rounding it down to the beginning of the `op_t'
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* it points in the middle of.
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*/
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srcp &= -OPSIZ;
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switch (len % 4) {
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case 2:
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a1 = ((op_t *) srcp)[0];
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a2 = ((op_t *) srcp)[1];
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srcp -= 1 * OPSIZ;
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dstp -= 3 * OPSIZ;
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len += 2;
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goto do1;
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case 3:
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a0 = ((op_t *) srcp)[0];
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a1 = ((op_t *) srcp)[1];
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srcp -= 0 * OPSIZ;
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dstp -= 2 * OPSIZ;
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len += 1;
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goto do2;
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case 0:
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if (OP_T_THRESHOLD <= 3 * OPSIZ && len == 0)
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return;
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a3 = ((op_t *) srcp)[0];
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a0 = ((op_t *) srcp)[1];
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srcp -=-1 * OPSIZ;
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dstp -= 1 * OPSIZ;
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len += 0;
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goto do3;
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case 1:
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a2 = ((op_t *) srcp)[0];
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a3 = ((op_t *) srcp)[1];
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srcp -=-2 * OPSIZ;
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dstp -= 0 * OPSIZ;
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len -= 1;
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if (OP_T_THRESHOLD <= 3 * OPSIZ && len == 0)
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goto do0;
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goto do4; /* No-op. */
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}
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do {
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do4:
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a0 = ((op_t *) srcp)[0];
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((op_t *) dstp)[0] = MERGE (a2, sh_1, a3, sh_2);
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do3:
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a1 = ((op_t *) srcp)[1];
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((op_t *) dstp)[1] = MERGE (a3, sh_1, a0, sh_2);
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do2:
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a2 = ((op_t *) srcp)[2];
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((op_t *) dstp)[2] = MERGE (a0, sh_1, a1, sh_2);
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do1:
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a3 = ((op_t *) srcp)[3];
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((op_t *) dstp)[3] = MERGE (a1, sh_1, a2, sh_2);
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srcp += 4 * OPSIZ;
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dstp += 4 * OPSIZ;
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len -= 4;
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} while (len != 0);
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/*
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* This is the right position for do0. Please don't move it into
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* the loop.
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*/
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do0:
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((op_t *) dstp)[0] = MERGE (a2, sh_1, a3, sh_2);
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}
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/*
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* _wordcopy_bwd_aligned -- Copy block finishing right before
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* SRCP to block finishing right before DSTP with LEN `op_t' words (not LEN
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* bytes!). Both SRCP and DSTP should be aligned for memory operations
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* on `op_t's.
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*/
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void _wordcopy_bwd_aligned (long int dstp, long int srcp, size_t len)
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{
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op_t a0, a1;
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switch (len % 8) {
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case 2:
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srcp -= 2 * OPSIZ;
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dstp -= 1 * OPSIZ;
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a0 = ((op_t *) srcp)[1];
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len += 6;
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goto do1;
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case 3:
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srcp -= 3 * OPSIZ;
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dstp -= 2 * OPSIZ;
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a1 = ((op_t *) srcp)[2];
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len += 5;
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goto do2;
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case 4:
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srcp -= 4 * OPSIZ;
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dstp -= 3 * OPSIZ;
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a0 = ((op_t *) srcp)[3];
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len += 4;
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goto do3;
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case 5:
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srcp -= 5 * OPSIZ;
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dstp -= 4 * OPSIZ;
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a1 = ((op_t *) srcp)[4];
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len += 3;
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goto do4;
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case 6:
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srcp -= 6 * OPSIZ;
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dstp -= 5 * OPSIZ;
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a0 = ((op_t *) srcp)[5];
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len += 2;
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goto do5;
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case 7:
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srcp -= 7 * OPSIZ;
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dstp -= 6 * OPSIZ;
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a1 = ((op_t *) srcp)[6];
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len += 1;
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goto do6;
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case 0:
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if (OP_T_THRESHOLD <= 3 * OPSIZ && len == 0)
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return;
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srcp -= 8 * OPSIZ;
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dstp -= 7 * OPSIZ;
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a0 = ((op_t *) srcp)[7];
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goto do7;
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case 1:
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srcp -= 9 * OPSIZ;
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dstp -= 8 * OPSIZ;
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a1 = ((op_t *) srcp)[8];
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len -= 1;
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if (OP_T_THRESHOLD <= 3 * OPSIZ && len == 0)
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goto do0;
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goto do8; /* No-op. */
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}
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do {
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do8:
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a0 = ((op_t *) srcp)[7];
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((op_t *) dstp)[7] = a1;
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do7:
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a1 = ((op_t *) srcp)[6];
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((op_t *) dstp)[6] = a0;
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do6:
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a0 = ((op_t *) srcp)[5];
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((op_t *) dstp)[5] = a1;
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do5:
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a1 = ((op_t *) srcp)[4];
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((op_t *) dstp)[4] = a0;
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do4:
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a0 = ((op_t *) srcp)[3];
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((op_t *) dstp)[3] = a1;
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do3:
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a1 = ((op_t *) srcp)[2];
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((op_t *) dstp)[2] = a0;
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do2:
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a0 = ((op_t *) srcp)[1];
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((op_t *) dstp)[1] = a1;
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do1:
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a1 = ((op_t *) srcp)[0];
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((op_t *) dstp)[0] = a0;
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srcp -= 8 * OPSIZ;
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dstp -= 8 * OPSIZ;
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len -= 8;
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} while (len != 0);
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/*
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* This is the right position for do0. Please don't move it into
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* the loop.
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*/
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do0:
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((op_t *) dstp)[7] = a1;
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}
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/*
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* _wordcopy_bwd_dest_aligned -- Copy block finishing right before SRCP to
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* block finishing right before DSTP with LEN `op_t' words (not LEN bytes!).
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* DSTP should be aligned for memory operations on `op_t', but SRCP must *not*
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* be aligned.
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*/
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void _wordcopy_bwd_dest_aligned (long int dstp, long int srcp, size_t len)
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{
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op_t a0, a1, a2, a3;
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int sh_1, sh_2;
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/*
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* Calculate how to shift a word read at the memory operation aligned
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* srcp to make it aligned for copy.
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*/
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sh_1 = 8 * (srcp % OPSIZ);
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sh_2 = 8 * OPSIZ - sh_1;
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/*
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* Make srcp aligned by rounding it down to the beginning of the op_t
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* it points in the middle of.
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*/
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srcp &= -OPSIZ;
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srcp += OPSIZ;
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switch (len % 4) {
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case 2:
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srcp -= 3 * OPSIZ;
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dstp -= 1 * OPSIZ;
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a2 = ((op_t *) srcp)[2];
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a1 = ((op_t *) srcp)[1];
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len += 2;
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goto do1;
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case 3:
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srcp -= 4 * OPSIZ;
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dstp -= 2 * OPSIZ;
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a3 = ((op_t *) srcp)[3];
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a2 = ((op_t *) srcp)[2];
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len += 1;
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goto do2;
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case 0:
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if (OP_T_THRESHOLD <= 3 * OPSIZ && len == 0)
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return;
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srcp -= 5 * OPSIZ;
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dstp -= 3 * OPSIZ;
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a0 = ((op_t *) srcp)[4];
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a3 = ((op_t *) srcp)[3];
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goto do3;
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case 1:
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srcp -= 6 * OPSIZ;
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dstp -= 4 * OPSIZ;
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a1 = ((op_t *) srcp)[5];
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a0 = ((op_t *) srcp)[4];
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len -= 1;
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if (OP_T_THRESHOLD <= 3 * OPSIZ && len == 0)
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goto do0;
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goto do4; /* No-op. */
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}
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do {
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do4:
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a3 = ((op_t *) srcp)[3];
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((op_t *) dstp)[3] = MERGE (a0, sh_1, a1, sh_2);
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do3:
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a2 = ((op_t *) srcp)[2];
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((op_t *) dstp)[2] = MERGE (a3, sh_1, a0, sh_2);
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do2:
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a1 = ((op_t *) srcp)[1];
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((op_t *) dstp)[1] = MERGE (a2, sh_1, a3, sh_2);
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do1:
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a0 = ((op_t *) srcp)[0];
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((op_t *) dstp)[0] = MERGE (a1, sh_1, a2, sh_2);
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srcp -= 4 * OPSIZ;
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dstp -= 4 * OPSIZ;
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len -= 4;
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} while (len != 0);
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/*
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* This is the right position for do0. Please don't move it into
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* the loop.
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*/
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do0:
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((op_t *) dstp)[3] = MERGE (a0, sh_1, a1, sh_2);
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}
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