diff options
Diffstat (limited to 'sysdeps/generic/wordcopy.c')
| -rw-r--r-- | sysdeps/generic/wordcopy.c | 405 |
1 files changed, 405 insertions, 0 deletions
diff --git a/sysdeps/generic/wordcopy.c b/sysdeps/generic/wordcopy.c new file mode 100644 index 0000000000..44dabf6e00 --- /dev/null +++ b/sysdeps/generic/wordcopy.c @@ -0,0 +1,405 @@ +/* _memcopy.c -- subroutines for memory copy functions. + Copyright (C) 1991 Free Software Foundation, Inc. + 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 Library General Public License as +published by the Free Software Foundation; either version 2 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 +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +/* BE VERY CAREFUL IF YOU CHANGE THIS CODE...! */ + +#include <ansidecl.h> +#include <stddef.h> +#include <memcopy.h> + +/* _wordcopy_fwd_aligned -- Copy block beginning at SRCP to + block beginning at DSTP with LEN `op_t' words (not LEN bytes!). + Both SRCP and DSTP should be aligned for memory operations on `op_t's. */ + +void +DEFUN(_wordcopy_fwd_aligned, (dstp, srcp, len), + long int dstp AND long int srcp AND size_t len) +{ + op_t a0, a1; + + switch (len % 8) + { + case 2: + a0 = ((op_t *) srcp)[0]; + srcp -= 6 * OPSIZ; + dstp -= 7 * OPSIZ; + len += 6; + goto do1; + case 3: + a1 = ((op_t *) srcp)[0]; + srcp -= 5 * OPSIZ; + dstp -= 6 * OPSIZ; + len += 5; + goto do2; + case 4: + a0 = ((op_t *) srcp)[0]; + srcp -= 4 * OPSIZ; + dstp -= 5 * OPSIZ; + len += 4; + goto do3; + case 5: + a1 = ((op_t *) srcp)[0]; + srcp -= 3 * OPSIZ; + dstp -= 4 * OPSIZ; + len += 3; + goto do4; + case 6: + a0 = ((op_t *) srcp)[0]; + srcp -= 2 * OPSIZ; + dstp -= 3 * OPSIZ; + len += 2; + goto do5; + case 7: + a1 = ((op_t *) srcp)[0]; + srcp -= 1 * OPSIZ; + dstp -= 2 * OPSIZ; + len += 1; + goto do6; + + case 0: + if (OP_T_THRES <= 3 * OPSIZ && len == 0) + return; + a0 = ((op_t *) srcp)[0]; + srcp -= 0 * OPSIZ; + dstp -= 1 * OPSIZ; + goto do7; + case 1: + a1 = ((op_t *) srcp)[0]; + srcp -=-1 * OPSIZ; + dstp -= 0 * OPSIZ; + len -= 1; + if (OP_T_THRES <= 3 * OPSIZ && len == 0) + goto do0; + goto do8; /* No-op. */ + } + + do + { + do8: + a0 = ((op_t *) srcp)[0]; + ((op_t *) dstp)[0] = a1; + do7: + a1 = ((op_t *) srcp)[1]; + ((op_t *) dstp)[1] = a0; + do6: + a0 = ((op_t *) srcp)[2]; + ((op_t *) dstp)[2] = a1; + do5: + a1 = ((op_t *) srcp)[3]; + ((op_t *) dstp)[3] = a0; + do4: + a0 = ((op_t *) srcp)[4]; + ((op_t *) dstp)[4] = a1; + do3: + a1 = ((op_t *) srcp)[5]; + ((op_t *) dstp)[5] = a0; + do2: + a0 = ((op_t *) srcp)[6]; + ((op_t *) dstp)[6] = a1; + do1: + a1 = ((op_t *) srcp)[7]; + ((op_t *) dstp)[7] = a0; + + srcp += 8 * OPSIZ; + dstp += 8 * OPSIZ; + len -= 8; + } + while (len != 0); + + /* This is the right position for do0. Please don't move + it into the loop. */ + do0: + ((op_t *) dstp)[0] = a1; +} + +/* _wordcopy_fwd_dest_aligned -- Copy block beginning at SRCP to + block beginning at DSTP with LEN `op_t' words (not LEN bytes!). + DSTP should be aligned for memory operations on `op_t's, but SRCP must + *not* be aligned. */ + +void +DEFUN(_wordcopy_fwd_dest_aligned, (dstp, srcp, len), + long int dstp AND long int srcp AND size_t len) +{ + op_t a0, a1, a2, a3; + int sh_1, sh_2; + + /* Calculate how to shift a word read at the memory operation + aligned srcp to make it aligned for copy. */ + + sh_1 = 8 * (srcp % OPSIZ); + sh_2 = 8 * OPSIZ - sh_1; + + /* Make SRCP aligned by rounding it down to the beginning of the `op_t' + it points in the middle of. */ + srcp &= -OPSIZ; + + switch (len % 4) + { + case 2: + a1 = ((op_t *) srcp)[0]; + a2 = ((op_t *) srcp)[1]; + srcp -= 1 * OPSIZ; + dstp -= 3 * OPSIZ; + len += 2; + goto do1; + case 3: + a0 = ((op_t *) srcp)[0]; + a1 = ((op_t *) srcp)[1]; + srcp -= 0 * OPSIZ; + dstp -= 2 * OPSIZ; + len += 1; + goto do2; + case 0: + if (OP_T_THRES <= 3 * OPSIZ && len == 0) + return; + a3 = ((op_t *) srcp)[0]; + a0 = ((op_t *) srcp)[1]; + srcp -=-1 * OPSIZ; + dstp -= 1 * OPSIZ; + len += 0; + goto do3; + case 1: + a2 = ((op_t *) srcp)[0]; + a3 = ((op_t *) srcp)[1]; + srcp -=-2 * OPSIZ; + dstp -= 0 * OPSIZ; + len -= 1; + if (OP_T_THRES <= 3 * OPSIZ && len == 0) + goto do0; + goto do4; /* No-op. */ + } + + do + { + do4: + a0 = ((op_t *) srcp)[0]; + ((op_t *) dstp)[0] = MERGE (a2, sh_1, a3, sh_2); + do3: + a1 = ((op_t *) srcp)[1]; + ((op_t *) dstp)[1] = MERGE (a3, sh_1, a0, sh_2); + do2: + a2 = ((op_t *) srcp)[2]; + ((op_t *) dstp)[2] = MERGE (a0, sh_1, a1, sh_2); + do1: + a3 = ((op_t *) srcp)[3]; + ((op_t *) dstp)[3] = MERGE (a1, sh_1, a2, sh_2); + + srcp += 4 * OPSIZ; + dstp += 4 * OPSIZ; + len -= 4; + } + while (len != 0); + + /* This is the right position for do0. Please don't move + it into the loop. */ + do0: + ((op_t *) dstp)[0] = MERGE (a2, sh_1, a3, sh_2); +} + +/* _wordcopy_bwd_aligned -- Copy block finishing right before + SRCP to block finishing right before DSTP with LEN `op_t' words + (not LEN bytes!). Both SRCP and DSTP should be aligned for memory + operations on `op_t's. */ + +void +DEFUN(_wordcopy_bwd_aligned, (dstp, srcp, len), + long int dstp AND long int srcp AND size_t len) +{ + op_t a0, a1; + + switch (len % 8) + { + case 2: + srcp -= 2 * OPSIZ; + dstp -= 1 * OPSIZ; + a0 = ((op_t *) srcp)[1]; + len += 6; + goto do1; + case 3: + srcp -= 3 * OPSIZ; + dstp -= 2 * OPSIZ; + a1 = ((op_t *) srcp)[2]; + len += 5; + goto do2; + case 4: + srcp -= 4 * OPSIZ; + dstp -= 3 * OPSIZ; + a0 = ((op_t *) srcp)[3]; + len += 4; + goto do3; + case 5: + srcp -= 5 * OPSIZ; + dstp -= 4 * OPSIZ; + a1 = ((op_t *) srcp)[4]; + len += 3; + goto do4; + case 6: + srcp -= 6 * OPSIZ; + dstp -= 5 * OPSIZ; + a0 = ((op_t *) srcp)[5]; + len += 2; + goto do5; + case 7: + srcp -= 7 * OPSIZ; + dstp -= 6 * OPSIZ; + a1 = ((op_t *) srcp)[6]; + len += 1; + goto do6; + + case 0: + if (OP_T_THRES <= 3 * OPSIZ && len == 0) + return; + srcp -= 8 * OPSIZ; + dstp -= 7 * OPSIZ; + a0 = ((op_t *) srcp)[7]; + goto do7; + case 1: + srcp -= 9 * OPSIZ; + dstp -= 8 * OPSIZ; + a1 = ((op_t *) srcp)[8]; + len -= 1; + if (OP_T_THRES <= 3 * OPSIZ && len == 0) + goto do0; + goto do8; /* No-op. */ + } + + do + { + do8: + a0 = ((op_t *) srcp)[7]; + ((op_t *) dstp)[7] = a1; + do7: + a1 = ((op_t *) srcp)[6]; + ((op_t *) dstp)[6] = a0; + do6: + a0 = ((op_t *) srcp)[5]; + ((op_t *) dstp)[5] = a1; + do5: + a1 = ((op_t *) srcp)[4]; + ((op_t *) dstp)[4] = a0; + do4: + a0 = ((op_t *) srcp)[3]; + ((op_t *) dstp)[3] = a1; + do3: + a1 = ((op_t *) srcp)[2]; + ((op_t *) dstp)[2] = a0; + do2: + a0 = ((op_t *) srcp)[1]; + ((op_t *) dstp)[1] = a1; + do1: + a1 = ((op_t *) srcp)[0]; + ((op_t *) dstp)[0] = a0; + + srcp -= 8 * OPSIZ; + dstp -= 8 * OPSIZ; + len -= 8; + } + while (len != 0); + + /* This is the right position for do0. Please don't move + it into the loop. */ + do0: + ((op_t *) dstp)[7] = a1; +} + +/* _wordcopy_bwd_dest_aligned -- Copy block finishing right + before SRCP to block finishing right before DSTP with LEN `op_t' + words (not LEN bytes!). DSTP should be aligned for memory + operations on `op_t', but SRCP must *not* be aligned. */ + +void +DEFUN(_wordcopy_bwd_dest_aligned, (dstp, srcp, len), + long int dstp AND long int srcp AND size_t len) +{ + op_t a0, a1, a2, a3; + int sh_1, sh_2; + + /* Calculate how to shift a word read at the memory operation + aligned srcp to make it aligned for copy. */ + + sh_1 = 8 * (srcp % OPSIZ); + sh_2 = 8 * OPSIZ - sh_1; + + /* Make srcp aligned by rounding it down to the beginning of the op_t + it points in the middle of. */ + srcp &= -OPSIZ; + srcp += OPSIZ; + + switch (len % 4) + { + case 2: + srcp -= 3 * OPSIZ; + dstp -= 1 * OPSIZ; + a2 = ((op_t *) srcp)[2]; + a1 = ((op_t *) srcp)[1]; + len += 2; + goto do1; + case 3: + srcp -= 4 * OPSIZ; + dstp -= 2 * OPSIZ; + a3 = ((op_t *) srcp)[3]; + a2 = ((op_t *) srcp)[2]; + len += 1; + goto do2; + case 0: + if (OP_T_THRES <= 3 * OPSIZ && len == 0) + return; + srcp -= 5 * OPSIZ; + dstp -= 3 * OPSIZ; + a0 = ((op_t *) srcp)[4]; + a3 = ((op_t *) srcp)[3]; + goto do3; + case 1: + srcp -= 6 * OPSIZ; + dstp -= 4 * OPSIZ; + a1 = ((op_t *) srcp)[5]; + a0 = ((op_t *) srcp)[4]; + len -= 1; + if (OP_T_THRES <= 3 * OPSIZ && len == 0) + goto do0; + goto do4; /* No-op. */ + } + + do + { + do4: + a3 = ((op_t *) srcp)[3]; + ((op_t *) dstp)[3] = MERGE (a0, sh_1, a1, sh_2); + do3: + a2 = ((op_t *) srcp)[2]; + ((op_t *) dstp)[2] = MERGE (a3, sh_1, a0, sh_2); + do2: + a1 = ((op_t *) srcp)[1]; + ((op_t *) dstp)[1] = MERGE (a2, sh_1, a3, sh_2); + do1: + a0 = ((op_t *) srcp)[0]; + ((op_t *) dstp)[0] = MERGE (a1, sh_1, a2, sh_2); + + srcp -= 4 * OPSIZ; + dstp -= 4 * OPSIZ; + len -= 4; + } + while (len != 0); + + /* This is the right position for do0. Please don't move + it into the loop. */ + do0: + ((op_t *) dstp)[3] = MERGE (a0, sh_1, a1, sh_2); +} |