diff options
Diffstat (limited to 'newlib/libc/machine/i960/memccpy.S')
| -rw-r--r-- | newlib/libc/machine/i960/memccpy.S | 143 |
1 files changed, 0 insertions, 143 deletions
diff --git a/newlib/libc/machine/i960/memccpy.S b/newlib/libc/machine/i960/memccpy.S deleted file mode 100644 index df1947228..000000000 --- a/newlib/libc/machine/i960/memccpy.S +++ /dev/null @@ -1,143 +0,0 @@ -/******************************************************************************* - * - * Copyright (c) 1993 Intel Corporation - * - * Intel hereby grants you permission to copy, modify, and distribute this - * software and its documentation. Intel grants this permission provided - * that the above copyright notice appears in all copies and that both the - * copyright notice and this permission notice appear in supporting - * documentation. In addition, Intel grants this permission provided that - * you prominently mark as "not part of the original" any modifications - * made to this software or documentation, and that the name of Intel - * Corporation not be used in advertising or publicity pertaining to - * distribution of the software or the documentation without specific, - * written prior permission. - * - * Intel Corporation provides this AS IS, WITHOUT ANY WARRANTY, EXPRESS OR - * IMPLIED, INCLUDING, WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY - * OR FITNESS FOR A PARTICULAR PURPOSE. Intel makes no guarantee or - * representations regarding the use of, or the results of the use of, - * the software and documentation in terms of correctness, accuracy, - * reliability, currentness, or otherwise; and you rely on the software, - * documentation and results solely at your own risk. - * - * IN NO EVENT SHALL INTEL BE LIABLE FOR ANY LOSS OF USE, LOSS OF BUSINESS, - * LOSS OF PROFITS, INDIRECT, INCIDENTAL, SPECIAL OR CONSEQUENTIAL DAMAGES - * OF ANY KIND. IN NO EVENT SHALL INTEL'S TOTAL LIABILITY EXCEED THE SUM - * PAID TO INTEL FOR THE PRODUCT LICENSED HEREUNDER. - * - ******************************************************************************/ - - .file "memccpy.s" -#ifdef __PIC - .pic -#endif -#ifdef __PID - .pid -#endif -/* - * (c) copyright 1989,1993 Intel Corp., all rights reserved - */ -/* - procedure memccpy (optimized assembler version for the 80960K series) - - dest_addr = memccpy (dest_addr, src_addr, char, len) - - copy len bytes pointed to by src_addr to the space pointed to by - dest_addr, stopping if char is copied. If char is copied, - return address of byte after char in dest string; else null. - - - Undefined behavior will occur if the end of the source array is in - the last two words of the program's allocated memory space. This - is so because the routine fetches ahead. Disallowing the fetch - ahead would impose a severe performance penalty. - - Undefined behavior will also occur if the source and destination - strings overlap. - - Strategy: - - Fetch the source array by words and store them by words to the - destination array, until there are fewer than three bytes left - to copy. Then, using the last word of the source (the one that - contains the remaining 0, 1, 2, or 3 bytes to be copied), store - a byte at a time until Ldone. - - Tactics: - - 1) Do NOT try to fetch and store the words in a word aligned manner - because, in my judgement, the performance degradation experienced due - to non-aligned accesses does NOT outweigh the time and complexity added - by the preamble and convoluted body that would be necessary to assure - alignment. This is supported by the intuition that most source and - destination arrays (even more true of most big source arrays) will - be word aligned to begin with. - - 2) Rather than decrementing len to zero, - I calculate the address of the byte after the last byte of the - destination array, and quit when the destination byte pointer passes - that. - -*/ - - .globl _memccpy - .leafproc _memccpy, __memccpy - .align 2 -_memccpy: -#ifndef __PIC - lda Lrett,g14 -#else - lda Lrett-(.+8)(ip),g14 -#endif -__memccpy: - mov g14, g13 # preserve return address - cmpibge 0,g3,Lexit_char_not_found - - addo g3,g1,g3 # compute beyond end of src - ld (g1), g7 # fetch first word of source - lda 0xff,g5 # mask for char - and g5,g2,g2 # extract only char - shlo 8,g2,g6 - or g2,g6,g6 - shlo 16,g6,g4 - or g6,g4,g6 # word of char - b Lwloop_b - -Lwloop_a: - ld (g1), g7 # fetch ahead next word of source - st g4, (g0) # store word to dest - addo 4, g0, g0 # post-increment dest pointer -Lwloop_b: # word copying loop - addo 4, g1, g1 # pre-increment src pointer - cmpo g3, g1 # is len <= 3 ? - mov g7, g4 # keep a copy of the current word - bl Lcloop_setup # quit word loop if less than 4 bytes - scanbyte g6, g7 # check for char - bno Lwloop_a # continue word loop if char not found. - -Lcloop_setup: - subo 4, g1, g1 # back down src pointer - cmpobe g1, g3, Lexit_char_not_found - -Lcloop_a: # character copying loop (len < 3) - and g5,g4,g7 # check the byte against char - cmpo g7,g2 - stob g7,(g0) # store the byte - addo 1, g0, g0 - be Lexit_char_found - addo 1,g1,g1 - cmpo g1,g3 - shro 8,g4,g4 # position next byte - bne Lcloop_a - -Lexit_char_not_found: - mov 0, g0 -Lexit_char_found: - lda 0,g14 - bx (g13) # g0 = dest array address; g14 = 0 -Lrett: - ret - - -/* end of memccpy */ |