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Diffstat (limited to 'newlib/libc/machine/i960/memccpy_ca.S')
| -rw-r--r-- | newlib/libc/machine/i960/memccpy_ca.S | 245 |
1 files changed, 0 insertions, 245 deletions
diff --git a/newlib/libc/machine/i960/memccpy_ca.S b/newlib/libc/machine/i960/memccpy_ca.S deleted file mode 100644 index 60c197b72..000000000 --- a/newlib/libc/machine/i960/memccpy_ca.S +++ /dev/null @@ -1,245 +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 "mccpy_ca.s" -#ifdef __PIC - .pic -#endif -#ifdef __PID - .pid -#endif -/* - * (c) copyright 1989,1993 Intel Corp., all rights reserved - */ - -/* - procedure memccpy (optimized assembler version for the 80960CA) - - dest_addr = memccpy (dest_addr, src_addr, char, len) - - copy len bytes pointed to by src_addr to the space pointed to by - dest_addr, stopping if char is copied. If char is copied, - return address of byte after char in dest string; else null. - - Undefined behavior will occur if the end of the source array is in - the last two words of the program's allocated memory space. This - is so because the routine fetches ahead. Disallowing the fetch - ahead would impose a severe performance penalty. - - Undefined behavior will also occur if the source and destination - strings overlap. - - - 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. -*/ - -#if __i960_BIG_ENDIAN__ -#define MSW g6 -#define LSW g7 -#else -#define LSW g6 -#define MSW g7 -#endif - - .globl _memccpy - .leafproc _memccpy, __memccpy - .align 2 -_memccpy: -#ifndef __PIC - lda Lrett,g14 -#else - lda Lrett-(.+8)(ip),g14 -#endif -__memccpy: - notand g1,3,g5 # extract word addr of start of src - lda (g14),g13 # preserve return address - cmpibge.f 0,g3,Lexit_char_not_found # Lexit if # of bytes to move is <= 0 - cmpo g5,g1 # check alignment of src - ld (g5),LSW # fetch word containing at least first byte - notand g0,3,g4 # extract word addr of start of dest - lda 4(g5),g5 # advance src word addr - shlo 24,g2,g2 # reduce char to single byte - bne.f Lcase_245 # branch if src is NOT word aligned - -Lcase_13: - cmpobe.t g0,g4,Lcase_1_setup # branch if dest word aligned - -Lcase_3: # src is word aligned; dest is not - mov LSW,MSW # make copy of first word of src - addo 4,g4,g1 # move dest word ptr to first word boundary - lda 32,g14 # initialize shift count to zero - -Lcase_25: -Lcase_3_cloop_at_start: # character copying loop for start of dest str - cmpdeci 0,g3,g3 # is max_bytes exhausted? -#if __i960_BIG_ENDIAN__ - lda -8(g14),g14 # augment the shift counter -#else - lda 8(g14),g14 # augment the shift counter -#endif - be.f Lexit_char_not_found # Lexit if max_bytes is exhausted -#if __i960_BIG_ENDIAN__ - rotate 8,MSW,MSW # move next byte into position for extraction -#endif - shlo 24,MSW,g4 - stob MSW,(g0) # store the byte in dest - cmpo g4,g2 - lda 1(g0),g0 # post-increment dest ptr -#if ! __i960_BIG_ENDIAN__ - shro 8,MSW,MSW # move next byte into position for extraction -#endif - be.f Lexit_char_found # Lexit if char found - cmpobne.t g1,g0,Lcase_3_cloop_at_start # branch if reached word boundary - - ld (g5),MSW # fetch msw of operand for double shift - -Lcase_4: - shro 8,g2,g4 - or g4,g2,g1 - shro 16,g1,g4 - or g4,g1,g4 - -#if __i960_BIG_ENDIAN__ - cmpobne 0,g14,Lcase_3_wloop - -Lcase_3_wloop2: - cmpi g3,4 # less than four bytes to move? - lda 4(g5),g5 # post-increment src word addr - mov LSW,g1 # extract 4 bytes of src - bl.f Lcase_13_cloop_setup # branch if < four bytes left to move - scanbyte g4,g1 # branch if word has char in it - bo.f Lcase_13_cloop_setup - mov MSW,LSW # move msw to lsw - ld (g5),MSW # pre-fetch msw of operand for double shift - subi 4,g3,g3 # decrease max_byte count by the 4 bytes moved - st g1,(g0) # store 4 bytes to dest - addo 4,g0,g0 # post-increment dest ptr - b Lcase_3_wloop2 -#endif - -Lcase_3_wloop: - cmpi g3,4 # less than four bytes to move? - lda 4(g5),g5 # post-increment src word addr - eshro g14,g6,g1 # extract 4 bytes of src - bl.f Lcase_13_cloop_setup # branch if < four bytes left to move - scanbyte g4,g1 # branch if word has char in it - bo.f Lcase_13_cloop_setup - mov MSW,LSW # move msw to lsw - ld (g5),MSW # pre-fetch msw of operand for double shift - subi 4,g3,g3 # decrease max_byte count by the 4 bytes moved - st g1,(g0) # store 4 bytes to dest - addo 4,g0,g0 # post-increment dest ptr - b Lcase_3_wloop - -Lcase_1_setup: - subo 4,g0,g0 # store is pre-incrementing; back up dest addr - shro 8,g2,g4 - or g4,g2,MSW - shro 16,MSW,g4 - or g4,MSW,g4 - b Lcase_1 -Lcase_1_wloop: # word copying loop - subi 4,g3,g3 # decrease max_byte count by the 4 bytes moved - ld (g5),LSW # pre-fetch next word of src - addo 4,g5,g5 # post-increment src addr - st g1,(g0) # store word in dest string -Lcase_1: # src and dest are word aligned - cmpi g3,4 # check for fewer than four bytes to move - addo 4,g0,g0 # pre-increment dest addr - lda (LSW),g1 # keep a copy of the src word - bl.f Lcase_13_cloop_setup # branch if less than four bytes to copy - scanbyte LSW,g4 # branch if char is not in foursome - bno.t Lcase_1_wloop -Lcase_13_cloop_setup: - cmpibe.f 0,g3,Lexit_char_not_found # Lexit if max_bytes is exhausted - -Lcase_1_cloop: -#if __i960_BIG_ENDIAN__ - rotate 8,g1,g1 # move next byte into position for extraction -#endif - shlo 24,g1,g4 - stob g1,(g0) # store the byte in dest - cmpo g4,g2 - lda 1(g0),g0 # post-increment dest byte addr - subi 1,g3,g3 - be.f Lexit_char_found # Lexit if char reached - cmpi 0,g3 -#if ! __i960_BIG_ENDIAN__ - shro 8,g1,g1 # move next byte into position for extraction -#endif - bne.t Lcase_1_cloop # continue if len not exhausted - -Lexit_char_not_found: - mov 0,g0 -Lexit_char_found: - lda 0,g14 - bx (g13) # g0 = dest array address; g14 = 0 -Lrett: - ret - - -Lcase_245: - cmpo g0,g4 # check alignment of dest - ld (g5),MSW # pre-fetch second half - and 3,g1,g1 # compute shift count - shlo 3,g1,g14 -#if __i960_BIG_ENDIAN__ - subo g14,0,g14 # adjust shift count for big endian -#endif - be.t Lcase_4 # branch if dest is word aligned - or g4,g1,g1 # is src earlier in word, later, or sync w/ dst - cmpo g0,g1 # < indicates first word of dest has more bytes - /* than first word of source. */ - eshro g14,g6,g4 # extract four bytes - lda 4(g0),g1 # move dest word addr to first word boundary -#if __i960_BIG_ENDIAN__ - bge.f 1f -#else - bg.f 1f -#endif - mov MSW,LSW - lda 4(g5),g5 # move src word addr to second word boundary -1: - notand g1,3,g1 - mov g4,MSW - b Lcase_25 - -/* end of memccpy */ |