diff options
Diffstat (limited to 'newlib/libc/machine/i960/strncmp_ca.S')
| -rw-r--r-- | newlib/libc/machine/i960/strncmp_ca.S | 253 |
1 files changed, 0 insertions, 253 deletions
diff --git a/newlib/libc/machine/i960/strncmp_ca.S b/newlib/libc/machine/i960/strncmp_ca.S deleted file mode 100644 index 0b1a8ff..0000000 --- a/newlib/libc/machine/i960/strncmp_ca.S +++ /dev/null @@ -1,253 +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 "sncmp_ca.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 CA) - - result = strncmp (src1_addr, src2_addr, max_bytes) - - compare the null terminated string pointed to by src1_addr to - the string space pointed to by src2_addr. Return 0 iff the strings - are equal, -1 if src1_addr is lexicly less than src2_addr, and 1 - if it is lexicly 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 word of the program's - allocated memory space. This is so because, in several cases, strncmp - will fetch ahead one word. Disallowing the fetch ahead would impose - a severe performance penalty. - - This program handles five cases: - - 1) both arguments start on a word boundary - 2) neither are word aligned, but they are offset by the same amount - 3) source1 is word aligned, source2 is not - 4) source2 is word aligned, source1 is not - 5) neither is word aligned, and they are offset by differing amounts - - At the time of this writing, only g0 thru g7 and g14 are available - for use in this leafproc; other registers would have to be saved and - restored. These nine registers are sufficient to implement the routine. - The registers are used as follows: - - g0 original src1 ptr; extracted word; return result - g1 src2 ptr; 0xff -- byte extraction mask - g2 maximum number of bytes to compare - g3 src2 word ptr - Little endian: - g4 lsw of src1 - g5 msw of src1 - g6 src2 word - g7 src1 word ptr - Big endian: - g4 msw of src1 - g5 lsw of src1 - g6 src1 word ptr - g7 src2 word - g13 return address - g14 shift count -*/ - -#if __i960_BIG_ENDIAN__ -#define MSW g4 -#define LSW g5 -#define SRC1 g6 -#define SRC2 g7 -#else -#define LSW g4 -#define MSW g5 -#define SRC2 g6 -#define SRC1 g7 -#endif - - .globl _strncmp - .globl __strncmp - .leafproc _strncmp, __strncmp - .align 2 -_strncmp: -#ifndef __PIC - lda Lrett,g14 -#else - lda Lrett-(.+8)(ip),g14 -#endif -__strncmp: -Lrestart: - notand g0,3,SRC1 # extract word addr of start of src1 - lda (g14),g13 # preserve return address - cmpibge.f 0,g2,Lequal_exit # return equality if number of bytes to - /* compare is none. */ -#if __i960_BIG_ENDIAN__ - cmpo g0,SRC1 # check alignment of src1 -#endif - ld (SRC1),LSW # fetch word with at least first byte of src1 - notand g1,3,g3 # extract word addr of start of src2 - ld 4(SRC1),MSW # fetch second word of src1 -#if __i960_BIG_ENDIAN__ - bne Lsrc1_unaligned # branch if src1 is unaligned - cmpo g3,g1 # check alignment of src2 - ld (g3),SRC2 # fetch word with at least first byte of src2 - shlo 3,g0,g14 # compute shift count for src1 - subo g14,0,g14 # adjust shift count for big endian - lda 8(SRC1),SRC1 # advance src1 word addr - bne.f Lsrc2_unaligned # branch if src2 is NOT word aligned - - /* src2 is word aligned */ - - mov LSW,g0 - -Lwloop2: # word comparing loop - cmpo SRC2,g0 # compare src1 and src2 words - lda 0xff000000,g1 # byte extraction mask - mov MSW,LSW # move msw of src1 to lsw - ld (SRC1),MSW # pre-fetch next msw of src1 - addo 4,SRC1,SRC1 # post-increment src1 addr - lda 4(g3),g3 # pre-increment src2 addr - bne.f Lcloop # branch if src1 and src2 unequal - scanbyte 0,g0 # check for null byte in src1 word - ld (g3),SRC2 # pre-fetch next word of src2 - mov LSW,g0 # extract word of src1 - subi 4,g2,g2 # decrement maximum byte count - bo.f Lequal_exit # branch if null byte encountered - cmpibl.t 0,g2,Lwloop2 # branch if max_bytes not reached yet - - b Lequal_exit # strings were equal up through max_bytes - -Lsrc1_unaligned: -#endif - cmpo g3,g1 # check alignment of src2 - ld (g3),SRC2 # fetch word with at least first byte of src2 - shlo 3,g0,g14 # compute shift count for src1 -#if __i960_BIG_ENDIAN__ - subo g14,0,g14 # adjust shift count for big endian -#endif - eshro g14,g4,LSW # extract word of src1 - lda 8(SRC1),SRC1 # advance src1 word addr - bne.f Lsrc2_unaligned # branch if src2 is NOT word aligned - - /* at least src2 is word aligned */ - - mov LSW,g0 - -Lwloop: # word comparing loop - cmpo SRC2,g0 # compare src1 and src2 words -#if __i960_BIG_ENDIAN__ - lda 0xff000000,g1 # byte extraction mask -#else - lda 0xff,g1 # byte extraction mask -#endif - mov MSW,LSW # move msw of src1 to lsw - ld (SRC1),MSW # pre-fetch next msw of src1 - addo 4,SRC1,SRC1 # post-increment src1 addr - lda 4(g3),g3 # pre-increment src2 addr - bne.f Lcloop # branch if src1 and src2 unequal - scanbyte 0,g0 # check for null byte in src1 word - ld (g3),SRC2 # pre-fetch next word of src2 - eshro g14,g4,g0 # extract word of src1 - subi 4,g2,g2 # decrement maximum byte count - bo.f Lequal_exit # branch if null byte encountered - cmpibl.t 0,g2,Lwloop # branch if max_bytes not reached yet - - b Lequal_exit # strings were equal up through max_bytes - -Lcloop_setup: # setup for coming from Lsrc2_unaligned - mov LSW,g0 # restore extracted src1 word -#if __i960_BIG_ENDIAN__ - lda 0xff000000,g1 # byte extraction mask -#else - lda 0xff,g1 # byte extraction mask -#endif - -Lcloop: # character comparing loop - and SRC2,g1,g3 # extract next char of src2 - and g0,g1,LSW # extract next char of src1 - cmpobne.f LSW,g3,.diff # check for equality - cmpo 0,LSW # check for null byte -#if __i960_BIG_ENDIAN__ - shro 8,g1,g1 # shift mask for next byte -#else - shlo 8,g1,g1 # shift mask for next byte -#endif - subi 1,g2,g2 # decrement character counter - bne.t Lcloop # branch if null not reached - - /* words are equal up thru null byte */ - -Lequal_exit: - mov 0,g14 # conform to register conventions - lda 0,g0 # return zero, indicating equality - bx (g13) # return - -Lrett: - ret - -.diff: - mov 0,g14 - bl Lless_than_exit -Lgreater_than_exit: - cmpibge.f 0,g2,Lequal_exit # branch if difference is beyond max_bytes - mov 1,g0 - bx (g13) # g0 = 1 (src1 > src2) -Lless_than_exit: - cmpibge.f 0,g2,Lequal_exit # branch if difference is beyond max_bytes - subi 1,0,g0 - bx (g13) # g0 = -1 (src1 < src2) - -Lsrc2_unaligned: - notor g1,3,g14 # first step in computing new src1 ptr - ld 4(g3),SRC1 # fetch second word of src2 - shlo 3,g1,MSW # compute shift count for src2 -#if __i960_BIG_ENDIAN__ - subo MSW,0,MSW # adjust shift count for big endian -#endif - eshro MSW,g6,SRC2 # extract word of src2 - cmpo LSW,SRC2 # compare src1 and src2 words - lda 4(g3),g1 # set new src2 ptr - bne.f Lcloop_setup # first four bytes differ - scanbyte 0,LSW # check for null byte - subo g14,g0,g0 # second (final) step in computing new src1 ptr - addi g14,g2,g2 # compute new max_bytes too - lda (g13),g14 # prepare return pointer for Lrestart - bno.t Lrestart # if null byte not encountered, continue - /* with both string fetches shifted such that*/ - /* src2 is now word aligned.*/ - mov 0,g14 # conform to register conventions. - lda 0,g0 # return indicator of equality. - bx (g13) |