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30891f35fa
We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
416 lines
9.7 KiB
C
416 lines
9.7 KiB
C
/* _memcopy.c -- subroutines for memory copy functions.
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Copyright (C) 1991-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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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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#ifndef WORDCOPY_FWD_ALIGNED
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# define WORDCOPY_FWD_ALIGNED _wordcopy_fwd_aligned
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#endif
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void
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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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{
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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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#ifndef WORDCOPY_FWD_DEST_ALIGNED
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# define WORDCOPY_FWD_DEST_ALIGNED _wordcopy_fwd_dest_aligned
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#endif
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void
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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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/* 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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#ifndef WORDCOPY_BWD_ALIGNED
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# define WORDCOPY_BWD_ALIGNED _wordcopy_bwd_aligned
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#endif
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void
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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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{
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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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#ifndef WORDCOPY_BWD_DEST_ALIGNED
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# define WORDCOPY_BWD_DEST_ALIGNED _wordcopy_bwd_dest_aligned
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#endif
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void
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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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/* 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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