diff options
Diffstat (limited to 'newlib/libc/machine/i960/strncat_ca.S')
| -rw-r--r-- | newlib/libc/machine/i960/strncat_ca.S | 300 |
1 files changed, 0 insertions, 300 deletions
diff --git a/newlib/libc/machine/i960/strncat_ca.S b/newlib/libc/machine/i960/strncat_ca.S deleted file mode 100644 index 45c5e171e..000000000 --- a/newlib/libc/machine/i960/strncat_ca.S +++ /dev/null @@ -1,300 +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 "sncat_ca.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 CA) - - 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 word of the program's - allocated memory space. This is so because, in several cases, strncat - 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) source is word aligned, destination is not - 4) destination is word aligned, source 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 g13 are available - for use in this leafproc; other registers would have to be saved and - restored. These nine registers, plus tricky use of g14 are sufficient - to implement the routine. The registers are used as follows: - - g0 original dest ptr; not modified, so that it may be returned. - g1 src ptr; shift count - g2 max_bytes - g3 src ptr (word aligned) - g4 dest ptr (word aligned) - g5 0xff -- byte extraction mask - Little endian: - g6 lsw of double word for extraction of 4 bytes - g7 msw of double word for extraction of 4 bytes - Big endian: - g6 msw of double word for extraction of 4 bytes - g7 lsw of double word for extraction of 4 bytes - g13 return address - g14 byte extracted. -*/ - -#if __i960_BIG_ENDIAN__ -#define MSW g6 -#define LSW g7 -#else -#define LSW g6 -#define MSW g7 -#endif - - .globl _strncat - .globl __strncat - .leafproc _strncat, __strncat - .align 2 -_strncat: -#ifndef __PIC - lda Lrett,g14 -#else - lda Lrett-(.+8)(ip),g14 -#endif -__strncat: - notand g0,3,g4 # extract word addr of start of dest - lda (g14),g13 # preserve return address - cmpibge.f 0,g2,Lexit_code # Lexit if number of bytes to move is <= zero. - and g0,3,LSW # extract byte offset of dest - ld (g4),MSW # fetch word containing at least first byte - shlo 3,LSW,g14 # get shift count for making mask for first word - subi 1,0,LSW # mask initially all ones -#if __i960_BIG_ENDIAN__ - shro g14,LSW,LSW # get mask for bytes needed from first word -#else - shlo g14,LSW,LSW # get mask for bytes needed from first word -#endif - notor MSW,LSW,MSW # set unneeded bytes to all ones - lda 0xff,g5 # byte extraction mask -Lsearch_for_word_with_null: - scanbyte 0,MSW # check for null byte - lda 4(g4),g4 # post-increment dest word pointer - mov MSW,LSW # keep a copy of current word - ld (g4),MSW # fetch next word of dest - bno.t Lsearch_for_word_with_null # branch if null not found yet -#if __i960_BIG_ENDIAN__ - shro 24,LSW,g14 # extract byte -#else - and g5,LSW,g14 # extract byte -#endif - cmpo 0,g14 # branch if null is first byte of word - subo 4,g4,g4 # move dest word ptr to word with null - notand g1,3,g3 # extract word addr of start of src - bne.t Lsearch_for_null - -Lcase_14: - cmpo g1,g3 # check alignment of source - ld (g3),LSW # fetch first word of source - shlo 3,g1,g14 # compute shift count - lda 4(g3),g3 # post-increment src addr - bne.f Lcase_4 # branch if source is unaligned -Lcase_1: -Lcase_1_wloop: # word copying loop - cmpi g2,4 # check for fewer than four bytes to move - lda (LSW),g1 # keep a copy of the src word - bl.f Lcase_1_cloop # branch if fewer than four bytes to copy - scanbyte 0,g1 # check for null byte in src word - ld (g3),LSW # pre-fetch next word of src - addo 4,g3,g3 # post-increment src addr - bo.f Lcase_1_cloop # branch if word contains null byte - subi 4,g2,g2 # decrease max_byte count by the 4 bytes moved - st g1,(g4) # store word in dest string - addo 4,g4,g4 # post-increment dest addr - b Lcase_1_wloop - -Lcase_3_cloop: -Lcase_1_cloop: # character copying loop (max_bytes <= 3) - cmpdeci 0,g2,g2 # is max_bytes exhausted? -#if __i960_BIG_ENDIAN__ - rotate 8,g1,g1 # move next byte into position for extraction -#endif - and g5,g1,g14 # extract next char - be.f Lstore_null # if max_bytes is exhausted, store null and quit - cmpo 0,g14 # check for null byte - stob g14,(g4) # store the byte in dest -#if ! __i960_BIG_ENDIAN__ - shro 8,g1,g1 # move next byte into position for extraction -#endif - lda 1(g4),g4 # post-increment dest byte addr - bne.t Lcase_1_cloop # branch if null not reached - bx (g13) # Lexit (g14 == 0) - -Lstore_null: - mov 0,g14 # store null, and set g14 to zero - stob g14,(g4) - bx (g13) - - -Lsearch_for_null: -#if __i960_BIG_ENDIAN__ - shlo 8,LSW,LSW # check next byte - shro 24,LSW,g14 -#else - shlo 8,g5,g5 # move mask up to next byte - and g5,LSW,g14 # extract byte -#endif - lda 1(g4),g4 # move dest byte ptr to next byte - cmpobne.t 0,g14,Lsearch_for_null # branch if null is not yet found - -Lcase_235: - cmpo g1,g3 # check alignment of src - ld (g3),LSW # pre-fetch word with start of src - and 3,g1,g1 # compute shift count - lda 0xff,g5 # load mask for byte extraction - shlo 3,g1,g14 - lda 4(g3),g3 # post-increment src word counter - be.t Lcase_3 # branch if src is word aligned - and g4,3,MSW # extract byte offset for dest string - cmpo MSW,g1 # < indicates first word of dest has more bytes - /* than first word of source. */ - ld (g3),MSW # fetch second word of src -#if __i960_BIG_ENDIAN__ - subo g14,0,g14 # adjust shift count for big endian -#endif - eshro g14,g6,g5 # extract four bytes -#if __i960_BIG_ENDIAN__ - bge.f 1f -#else - bg.f 1f -#endif - mov MSW,LSW - lda 4(g3),g3 # move src word addr to second word boundary -1: - mov g5,MSW - lda 0xff,g5 - b Lcase_25 - -Lcase_3: # src is word aligned; dest is not - mov LSW,MSW # make copy of first word of src - lda 32,g14 # initialize shift count to zero (mod 32) -Lcase_25: - -Lcase_3_cloop_at_start: # character copying loop for start of dest str - cmpdeci 0,g2,g2 # is max_bytes exhausted? -#if __i960_BIG_ENDIAN__ - shro 24,MSW,g5 # extract next char -#else - and g5,MSW,g5 # extract next char -#endif - be.f Lstore_null # Lexit if max_bytes is exhausted - cmpo 0,g5 # check for null byte - stob g5,(g4) # store the byte in dest - addo 1,g4,g4 # post-increment dest ptr - lda 0xff,g5 # re-initialize byte extraction mask - notand g4,3,g1 # extract word address - be.t Lexit_code # Lexit if null byte reached - cmpo g1,g4 # have we reached word boundary in dest yet? -#if __i960_BIG_ENDIAN__ - lda -8(g14),g14 # augment the shift counter - rotate 8,MSW,MSW # move next byte into position for extraction -#else - lda 8(g14),g14 # augment the shift counter - shro 8,MSW,MSW # move next byte into position for extraction -#endif - bne.t Lcase_3_cloop_at_start # branch if reached word boundary? - -#if __i960_BIG_ENDIAN__ - cmpo 0,g14 - ld (g3),MSW # fetch msw of operand for double shift - bne Lcase_3_wloop # branch if src is still unaligned. - -Lcase_3_wloop2: - cmpi g2,4 # less than four bytes to move? - mov LSW,g1 # extract 4 bytes of src - lda 4(g3),g3 # post-increment src word addr - bl.f Lcase_3_cloop # branch if < four bytes left to move - scanbyte 0,g1 # check for null byte - mov MSW,LSW # move msw to lsw - ld (g3),MSW # pre-fetch msw of operand for double shift - bo.f Lcase_3_cloop # branch if word contains null byte - subi 4,g2,g2 # decrease max_byte count by the 4 bytes moved - st g1,(g4) # store 4 bytes to dest - addo 4,g4,g4 # post-increment dest ptr - b Lcase_3_wloop2 -Lcase_4: - subo g14,0,g14 # adjust shift count for big endian -#else -Lcase_4: -#endif - - ld (g3),MSW # fetch msw of operand for double shift - -Lcase_3_wloop: - cmpi g2,4 # less than four bytes to move? - eshro g14,g6,g1 # extract 4 bytes of src - lda 4(g3),g3 # post-increment src word addr - bl.f Lcase_3_cloop # branch if < four bytes left to move - scanbyte 0,g1 # check for null byte - mov MSW,LSW # move msw to lsw - ld (g3),MSW # pre-fetch msw of operand for double shift - bo.f Lcase_3_cloop # branch if word contains null byte - subi 4,g2,g2 # decrease max_byte count by the 4 bytes moved - st g1,(g4) # store 4 bytes to dest - addo 4,g4,g4 # post-increment dest ptr - b Lcase_3_wloop - - -Lexit_code: - mov 0,g14 # conform to register conventions - bx (g13) # g0 = addr of dest; g14 = 0 -Lrett: - ret - -/* end of strncat */ - |