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Diffstat (limited to 'newlib/libc/machine/i960/strcmp.S')
| -rw-r--r-- | newlib/libc/machine/i960/strcmp.S | 118 |
1 files changed, 0 insertions, 118 deletions
diff --git a/newlib/libc/machine/i960/strcmp.S b/newlib/libc/machine/i960/strcmp.S deleted file mode 100644 index c0cd4bd6f..000000000 --- a/newlib/libc/machine/i960/strcmp.S +++ /dev/null @@ -1,118 +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 "strcmp.s" -#ifdef __PIC - .pic -#endif -#ifdef __PID - .pid -#endif -/* - * (c) copyright 1988,1993 Intel Corp., all rights reserved - */ -/* - procedure strcmp (optimized assembler version for the 80960K Series) - - result = strcmp (src1_addr, src2_addr) - - 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. - - 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 strcmp fetches - ahead. Disallowing the fetch ahead would impose a severe performance - penalty. - - Strategy: - - Fetch the source strings by words and compare the words until either - differing words are found or the null byte is encountered. In either - case, move through the word until either the differing byte if found, - in which case return -1 or 1 appropriately; or the null byte is - encountered, in which case, return zero (equality). - - 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. This is supported by the intuition that many source - strings will be word aligned to begin with. -*/ - - .globl _strcmp - .globl __strcmp - .leafproc _strcmp,__strcmp - .align 2 - -_strcmp: -#ifndef __PIC - lda .Lrett,g14 -#else - lda .Lrett-(.+8)(ip),g14 -#endif -__strcmp: - ld (g0), g5 # fetch first word of source_1 - mov g14,g7 # preserve return address - ldconst 0,g14 # conform to register conventions - ldconst 0xff,g4 # byte extraction mask -.Lwloop: - addo 4,g0,g0 # post-increment source_1 byte ptr - ld (g1), g3 # fetch word of source_2 - scanbyte 0,g5 # does word have a null byte? - mov g5,g2 # save a copy of the source_1 word - be .Lcloop # branch if null byte encountered - cmpo g2,g3 # are the source words the same? - addo 4,g1,g1 # post-increment source_2 byte ptr - ld (g0), g5 # fetch ahead next word of source_1 - be .Lwloop # fall thru if words are unequal - -.Lcloop: and g4,g2,g5 # extract and compare individual bytes - and g4,g3,g6 - cmpobne g5,g6,.diff # if they differ, go return 1 or -1 - cmpo 0,g6 # they are the same. Are they null? - shlo 8,g4,g4 # position mask for next extraction - bne .Lcloop # loop if null not encountered - - mov 0,g0 # return equality - bx (g7) -.Lrett: - ret -.diff: bl .neg - mov 1,g0 - bx (g7) -.neg: subi 1,0,g0 -.Lexit: - bx (g7) |