413 lines
9.6 KiB
C
413 lines
9.6 KiB
C
/* _memcopy.c -- subroutines for memory copy functions.
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Copyright (C) 1991, 1996 Free Software Foundation, Inc.
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Contributed by Torbjorn Granlund (tege@sics.se).
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library 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
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* BE VERY CAREFUL IF YOU CHANGE THIS CODE...! */
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#include <stddef.h>
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#include <memcopy.h>
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/* _wordcopy_fwd_aligned -- Copy block beginning at SRCP to
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block beginning 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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void
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_wordcopy_fwd_aligned (dstp, srcp, len)
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long int dstp;
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long int srcp;
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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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{
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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_THRES <= 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_THRES <= 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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{
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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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}
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while (len != 0);
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/* This is the right position for do0. Please don't move
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it into the loop. */
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do0:
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((op_t *) dstp)[0] = a1;
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}
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/* _wordcopy_fwd_dest_aligned -- Copy block beginning at SRCP to
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block beginning at DSTP with LEN `op_t' words (not LEN bytes!).
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DSTP should be aligned for memory operations on `op_t's, but SRCP must
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*not* be aligned. */
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void
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_wordcopy_fwd_dest_aligned (dstp, srcp, len)
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long int dstp;
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long int srcp;
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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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/* Calculate how to shift a word read at the memory operation
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aligned srcp to make it aligned for copy. */
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sh_1 = 8 * (srcp % OPSIZ);
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sh_2 = 8 * OPSIZ - sh_1;
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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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srcp &= -OPSIZ;
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switch (len % 4)
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{
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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_THRES <= 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_THRES <= 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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{
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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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}
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while (len != 0);
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/* This is the right position for do0. Please don't move
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it into the loop. */
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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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/* _wordcopy_bwd_aligned -- Copy block finishing right before
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SRCP to block finishing right before DSTP with LEN `op_t' words
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(not LEN bytes!). Both SRCP and DSTP should be aligned for memory
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operations on `op_t's. */
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void
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_wordcopy_bwd_aligned (dstp, srcp, len)
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long int dstp;
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long int srcp;
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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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{
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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_THRES <= 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_THRES <= 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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{
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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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}
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while (len != 0);
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/* This is the right position for do0. Please don't move
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it into the loop. */
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do0:
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((op_t *) dstp)[7] = a1;
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}
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/* _wordcopy_bwd_dest_aligned -- Copy block finishing right
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before SRCP to block finishing right before DSTP with LEN `op_t'
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words (not LEN bytes!). DSTP should be aligned for memory
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operations on `op_t', but SRCP must *not* be aligned. */
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void
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_wordcopy_bwd_dest_aligned (dstp, srcp, len)
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long int dstp;
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long int srcp;
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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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/* Calculate how to shift a word read at the memory operation
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aligned srcp to make it aligned for copy. */
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sh_1 = 8 * (srcp % OPSIZ);
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sh_2 = 8 * OPSIZ - sh_1;
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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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srcp &= -OPSIZ;
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srcp += OPSIZ;
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switch (len % 4)
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{
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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_THRES <= 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_THRES <= 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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{
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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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}
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while (len != 0);
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/* This is the right position for do0. Please don't move
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it into the loop. */
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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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