diff options
Diffstat (limited to 'newlib/libc/machine/i960/memcmp.S')
| -rw-r--r-- | newlib/libc/machine/i960/memcmp.S | 128 |
1 files changed, 0 insertions, 128 deletions
diff --git a/newlib/libc/machine/i960/memcmp.S b/newlib/libc/machine/i960/memcmp.S deleted file mode 100644 index 709eb2bdb..000000000 --- a/newlib/libc/machine/i960/memcmp.S +++ /dev/null @@ -1,128 +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 "memcmp.s" -#ifdef __PIC - .pic -#endif -#ifdef __PID - .pid -#endif -/* - * (c) copyright 1988,1993 Intel Corp., all rights reserved - */ -/* - procedure memcmp (optimized assembler version for the 80960K series) - - result = memcmp (src1_addr, src2_addr, max_bytes) - - compare the byte array pointed to by src1_addr to the byte array - pointed to by src2_addr. Return 0 iff the arrays are equal, -1 iff - src1_addr is lexicographically less than src2_addr, and 1 iff it is - lexicographically greater. Do not compare more than max_bytes bytes. - - Undefined behavior will occur if the end of either source array - is in the last two words of the program's allocated memory space. - This is so because memcmp 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 - a differing word is found or max_bytes is exhausted. In the former - case, move through the words to find the differing byte and return - plus or minus one, appropriately. In the latter 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 that would be necessary to assure alignment. This - is supported by the intuition that most source arrays (even more - true of most big source arrays) will be word aligned to begin with. - - 2) Rather than decrementing max_bytes to zero, I calculate the - address of the byte after the last byte of the source_1 array, and - quit when the source byte pointer passes that. -*/ - - .globl _memcmp - .globl __memcmp - .leafproc _memcmp,__memcmp - .align 2 - -_memcmp: -#ifndef __PIC - lda .Lrett,g14 -#else - lda .Lrett-(.+8)(ip),g14 -#endif -__memcmp: - mov g14,g13 # preserve return address - ldconst 0,g14 # conform to register conventions - cmpibge 0,g2,Lequal_exit # quit if max_bytes <= 0 - addo g0,g2,g2 # calculate byte addr of byte after last in src1 - -.Lwloop: - cmpo g0,g2 - ld (g0), g5 # fetch word of source_1 - bge Lequal_exit # quit (equal) if max_bytes exhausted - ld (g1), g3 # fetch word of source_2 - addo 4,g0,g0 # post-increment source_1 byte ptr - addo 4,g1,g1 # post-increment source_2 byte ptr - cmpobe g5,g3,.Lwloop # branch if source words are equal - - ldconst 0xff,g4 # byte extraction mask - subo 4,g0,g0 # back up src1 pointer - -.Lcloop: and g4,g5,g7 # extract and compare individual bytes - and g4,g3,g6 - cmpobne g7,g6,.diff # branch if they are different - shlo 8,g4,g4 # position mask for next extraction - addo 1,g0,g0 - cmpobl g0,g2,.Lcloop # quit if max_bytes is exhausted - -Lequal_exit: - mov 0,g0 - bx (g13) -.Lrett: - ret - -.diff: bl .neg # arrays differ at current byte. - /* return 1 or -1 appropriately */ - mov 1,g0 - bx (g13) -.neg: subi 1,0,g0 -.Lexit: - bx (g13) - -/* end or memcmp */ |