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Diffstat (limited to 'newlib/libc/machine/i960/strncmp.S')
| -rw-r--r-- | newlib/libc/machine/i960/strncmp.S | 129 |
1 files changed, 0 insertions, 129 deletions
diff --git a/newlib/libc/machine/i960/strncmp.S b/newlib/libc/machine/i960/strncmp.S deleted file mode 100644 index 030b750..0000000 --- a/newlib/libc/machine/i960/strncmp.S +++ /dev/null @@ -1,129 +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 "strncmp.s" -#ifdef __PIC - .pic -#endif -#ifdef __PID - .pid -#endif -/* - * (c) copyright 1988,1993 Intel Corp., all rights reserved - */ -/* - procedure strncmp (optimized assembler version for the 80960K Series) - - result = strncmp (src1_addr, src2_addr, max_bytes) - - compare the null terminated string pointed to by src1_addr to - the string pointed to by src2_addr. Return 0 iff the strings - are equal, -1 if src1_addr is lexicographically less than src2_addr, - and 1 if it is lexicographically greater. Do not compare more than - max_bytes bytes. - - Undefined behavior will occur if the end of either 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 strncmp - will fetch ahead. Disallowing the fetch ahead would impose - a severe performance penalty. - - Strategy: - - Fetch and compare the strings by words and go to a character - comparison loop as soon as a pair of words differ. If the - words are equal up through either the exhaustion of max_bytes - or the presence of the null byte, return 0 (equality). Otherwise, - the character comparator will return -1 or 1 for inequality, or - 0 if the differing byte is after the null byte or after the - exhaustion of max_bytes. - - Tactics: - - 1) Do NOT try to fetch 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 _strncmp - .globl __strncmp - .leafproc _strncmp,__strncmp - .align 2 - -_strncmp: -#ifndef __PIC - lda .Lrett,g14 -#else - lda .Lrett-(.+8)(ip),g14 -#endif -__strncmp: - mov g14,g13 - ldconst 0,g14 - cmpibge 0,g2,Lequal_exit # Lexit early if max_bytes <= 0 - addo g2,g0,g2 -.Lwloop: - cmpo g0,g2 # are max_bytes exhausted? - ld (g0), g5 # fetch word of source_1 - bge Lequal_exit # Lexit (equality) if max_bytes exhausted - ld (g1), g3 # fetch word of source_2 - addo 4,g0,g0 # post-increment source_1 ptr - scanbyte 0,g5 # is a null byte present? - addo 4,g1,g1 # post-increment source_1 ptr - be .Lcloop.a # perform char comparator if null byte found - cmpobe g5,g3,.Lwloop # perform char comparator if words are unequal - -.Lcloop.a: subo 4,g0,g0 # adjust max_byte counter - ldconst 0xff,g4 # byte extraction mask - -.Lcloop: and g4,g5,g7 # compare individual bytes - and g4,g3,g6 - cmpobne g7,g6,.diff # if different, return -1 or 1 - cmpo 0,g6 # they are equal. are they null? - shlo 8,g4,g4 # position mask to extract next byte - be Lequal_exit # if they are null, Lexit (equality) - addo 1,g0,g0 # is max_bytes exhausted? - cmpobl g0,g2,.Lcloop # if not, loop. if so, Lexit (equality) - -Lequal_exit: - mov 0,g0 - bx (g13) -.Lrett: - ret -.diff: bl .neg - mov 1,g0 - bx (g13) - -.neg: subi 1,0,g0 -.Lexit: - bx (g13) - -/* end of strncmp */ |