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Diffstat (limited to 'newlib/libc/machine/i960/strncat.S')
| -rw-r--r-- | newlib/libc/machine/i960/strncat.S | 155 |
1 files changed, 0 insertions, 155 deletions
diff --git a/newlib/libc/machine/i960/strncat.S b/newlib/libc/machine/i960/strncat.S deleted file mode 100644 index a655824ea..000000000 --- a/newlib/libc/machine/i960/strncat.S +++ /dev/null @@ -1,155 +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 "strncat.s" -#ifdef __PIC - .pic -#endif -#ifdef __PID - .pid -#endif -/* - * (c) copyright 1988,1993 Intel Corp., all rights reserved - */ -/* - procedure strncat (optimized assembler version for the 80960K Series) - - dest_addr = strncat (dest_addr, src_addr, max_bytes) - - append the null terminated string pointed to by src_addr to the null - terminated string pointed to by dest_addr. Return the original - dest_addr. If the source string is longer than max_bytes, then - append only max_bytes bytes, and tack on a null byte on the end. - - This routine will fail if the source and destination string - overlap (in particular, if the end of the source is overlapped - by the beginning of the destination). The behavior is undefined. - This is acceptable according to the draft C standard. - - Undefined behavior will also occur if the end of the source string - (i.e. the terminating null byte) is in the last two words of the - program's allocated memory space. This is so because strncat fetches - ahead. Disallowing the fetch ahead would impose a severe performance - penalty. - - Strategy: - - First, skip to the null byte in the destination string. Then - fetch the source string by words and store them by words to the - destination string, 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. - - If, before exhausting the max_byte count, the null byte is encountered - in the source string, then just copy up thru the null byte. - - 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. -*/ - - .globl _strncat - .globl __strncat - .leafproc _strncat,__strncat - .align 2 -_strncat: -#ifndef __PIC - lda Lrett,g14 -#else - lda Lrett-(.+8)(ip),g14 -#endif -__strncat: - mov g14,g6 - cmpibge 0, g2, Lno_operation # Lexit early if max_bytes <= 0 - mov g0, g5 -Lskip_word_loop: - ld (g5), g7 # fetch word of dest string - addo 4, g5, g5 # post-increment dest ptr - scanbyte 0, g7 # does it contain null byte? - bno Lskip_word_loop # if not, loop - subo 5, g5, g5 # adjust dest ptr - lda 0xff, g3 # byte extraction mask = 0xff; -Lskip_byte_loop: - and g7, g3, g14 # extract byte of last word of dest string - cmpo 0, g14 # is it null? - addo 1, g5, g5 # adjust dest ptr - shro 8, g7, g7 # position next byte for extraction - bne Lskip_byte_loop # loop if null not found yet - - ld (g1), g7 # fetch first word of source string -Lwloop: # word copying loop - cmpo 4, g2 # max_bytes < 4 ? - addo 4, g1, g1 # post-increment source ptr - bge Lcloop.a # branch if less than 4 bytes to move - scanbyte 0, g7 # is null byte reached yet? - mov g7, g4 # keep a copy of the source word - be Lcloop # branch if null byte reached - ld (g1), g7 # pre-fetch next word of source - subo 4, g2, g2 # reduce max_byte counter - st g4, (g5) # store current word - addo 4, g5, g5 # post-increment destination ptr - b Lwloop - -Lcloop.b: - addo 1, g5, g5 # post-increment destination ptr - shro 8, g7, g7 # position next byte for extraction -Lcloop: # character copying loop (max_byte > 3) - and g3, g7, g4 # extract character - cmpo 0, g4 # is it null? - stob g4, (g5) # store it - bne Lcloop.b # loop if null not encountered yet - - bx (g6) # g0 = dest string address; g14 = 0 -Lrett: - ret - -Lcloop.c: - addo 1, g5, g5 # post-increment destination ptr - shro 8, g7, g7 # position next byte for extraction -Lcloop.a: # character copying loop (max_byte <= 3) - cmpdeco 0,g2,g2 # max_byte == 0? - and g3, g7, g4 # extract character - be Ldone # store null and Lexit if max_byte exhausted - cmpo 0, g4 # is it null? - stob g4, (g5) # store it - bne Lcloop.c # loop if null not encountered yet - -Ldone: stob g14, (g5) # store trailing null - bx (g6) # g0 = dest string address; g14 = 0 - -Lno_operation: mov 0, g14 # conform to register conventions - bx (g6) - -/* end of strncat */ |