diff options
Diffstat (limited to 'newlib/libc/machine/i960/memcpy_ca.S')
| -rw-r--r-- | newlib/libc/machine/i960/memcpy_ca.S | 353 |
1 files changed, 0 insertions, 353 deletions
diff --git a/newlib/libc/machine/i960/memcpy_ca.S b/newlib/libc/machine/i960/memcpy_ca.S deleted file mode 100644 index eebfa88a1..000000000 --- a/newlib/libc/machine/i960/memcpy_ca.S +++ /dev/null @@ -1,353 +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 "memcp_ca.s" -#ifdef __PIC - .pic -#endif -#ifdef __PID - .pid -#endif -/* - * (c) copyright 1988,1992,1993 Intel Corp., all rights reserved - */ - -/* - procedure memmove (optimized assembler version for the CA) - procedure memcpy (optimized assembler version for the CA) - - dest_addr = memmove (dest_addr, src_addr, len) - dest_addr = memcpy (dest_addr, src_addr, len) - - copy len bytes pointed to by src_addr to the space pointed to by - dest_addr. Return the original dest_addr. - - Memcpy 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. - Memmove will not fail if overlap exists. - - 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, the - routine 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 dest ptr; not modified, so that it may be returned - g1 src ptr; shift count - g2 len - g3 src ptr (word aligned) - g4 dest ptr (word aligned) - g5 -4 for Lbackwards move - 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 _memmove, _memcpy - .globl __memmove, __memcpy - .leafproc _memmove, __memmove - .leafproc _memcpy, __memcpy - .align 2 -_memcpy: -_memmove: -#ifndef __PIC - lda Lrett,g14 -#else - lda Lrett-(.+8)(ip),g14 -#endif -__memcpy: -__memmove: - cmpibge.f 0,g2,Lquick_exit # Lexit if number of bytes to move is <= zero. - cmpo g0,g1 # if dest starts earlier than src ... - lda (g14),g13 # preserve return address - addo g2,g1,g5 # compute addr of byte after last byte of src - be.f Lexit_code # no move necessary if src and dest are same - concmpo g5,g0 # ... or if dest starts after end of src ... - notand g1,3,g3 # extract word addr of start of src - bg.f Lbackwards # ... then drop thru, else do move backwards - cmpo g3,g1 # check alignment of src - ld (g3),LSW # fetch word containing at least first byte - notand g0,3,g4 # extract word addr of start of dest - lda 4(g3),g3 # advance src word addr - bne.f Lcase_245 # branch if src is NOT word aligned - -Lcase_13: - cmpo g0,g4 # check alignment of dest - subo 4,g4,g4 # store is pre-incrementing; back up dest addr - be.t Lcase_1 # branch if dest word aligned - -Lcase_3: # src is word aligned; dest is not - addo 8,g4,g4 # move dest word ptr to first word boundary - lda (g0),g1 # copy dest byte ptr - 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? - be.f Lexit_code # Lexit if max_bytes is exhausted -#if __i960_BIG_ENDIAN__ - rotate 8,MSW,MSW # move next byte into position for extraction - subo 8,g14,g14 # augment the shift counter - stob MSW,(g1) # store the byte in dest -#else - addo 8,g14,g14 # augment the shift counter - stob MSW,(g1) # store the byte in dest - shro 8,MSW,MSW # move next byte into position for extraction -#endif - lda 1(g1),g1 # post-increment dest ptr - cmpobne.t g1,g4,Lcase_3_cloop_at_start # branch if reached word boundary - - ld (g3),MSW # fetch msw of operand for double shift - -Lcase_4: -Lcase_3_wloop: - cmpi g2,4 # less than four bytes to move? - lda 4(g3),g3 # post-increment src word addr - eshro g14,g6,g1 # extract 4 bytes of src - bl.f Lcase_3_cloop # branch if < four bytes left to move - mov MSW,LSW # move msw to lsw - ld (g3),MSW # pre-fetch msw of operand for double shift - 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 - -Lcase_1_wloop: # word copying loop - subi 4,g2,g2 # decrease max_byte count by the 4 bytes moved - ld (g3),LSW # pre-fetch next word of src - addo 4,g3,g3 # post-increment src addr - st g1,(g4) # store word in dest string -Lcase_1: # src and dest are word aligned - cmpi g2,4 # check for fewer than four bytes to move - addo 4,g4,g4 # pre-increment dest addr - lda (LSW),g1 # keep a copy of the src word - bge.t Lcase_1_wloop # branch if at least four bytes to copy -Lcase_3_cloop: - cmpibe.f 0,g2,Lexit_code # 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 - subi 1,g2,g2 - stob g1,(g4) # store the byte in dest - cmpi 0,g2 - lda 1(g4),g4 # post-increment dest byte addr -#if ! __i960_BIG_ENDIAN__ - shro 8,g1,g1 # move next byte into position for extraction -#endif - bne.t Lcase_1_cloop # Lexit if max_bytes is exhausted - -Lexit_code: - mov 0,g14 # conform to register conventions - bx (g13) # g0 = addr of dest; g14 = 0 -Lrett: - ret - - -Lcase_245: - cmpo g0,g4 # check alignment of dest - ld (g3),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 - lda 4(g4),g4 # move dest word addr to first word boundary - eshro g14,g6,g5 # extract four bytes - lda (g0),g1 -#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 - b Lcase_25 - - -Lbackwards: - notand g5,3,MSW # extract word addr of byte after end of src - cmpo MSW,g5 # check alignment of end of src - subo 4,MSW,g3 # retreat src word addr - addo g2,g0,g1 # compute addr of byte after end of dest - notand g1,3,g4 # extract word addr of start of dest - bne.f Lcase.245 # branch if src is NOT word aligned - -Lcase.13: - cmpo g1,g4 # check alignment of dest - ld (g3),MSW # fetch last word of src - subo 4,g3,g3 # retreat src word addr - be.t Lcase.1 # branch if dest word aligned - -Lcase.3: # src is word aligned; dest is not - mov MSW,LSW # 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? - be.f Lexit_code # Lexit if max_bytes is exhausted -#if ! __i960_BIG_ENDIAN__ - rotate 8,LSW,LSW # move next byte into position for storing -#endif - lda -1(g1),g1 # pre-decrement dest ptr - cmpo g1,g4 # have we reached word boundary in dest yet? - stob LSW,(g1) # store the byte in dest -#if __i960_BIG_ENDIAN__ - shro 8,LSW,LSW # move next byte into position for storing - addo 8,g14,g14 # augment the shift counter -#else - subo 8,g14,g14 # augment the shift counter -#endif - bne.t Lcase.3_cloop_at_start # branch if reached word boundary? - - ld (g3),LSW # fetch lsw of operand for double shift - -#if __i960_BIG_ENDIAN__ - cmpobne 0,g14,Lcase.3_wloop -Lcase.3_wloop2: - cmpi g2,4 # less than four bytes to move? - lda -4(g3),g3 # post-decrement src word addr - mov MSW,g1 # extract 4 bytes of src - lda (LSW),MSW # move lsw to msw - subo 4,g4,g4 # pre-decrement dest ptr - bl.f Lcase.3_cloop # branch if < four bytes left to move - ld (g3),LSW # pre-fetch lsw of operand for double shift - subi 4,g2,g2 # decrease max.byte count by the 4 bytes moved - st g1,(g4) # store 4 bytes to dest - b Lcase.3_wloop2 -#endif - -Lcase.4: -Lcase.3_wloop: - cmpi g2,4 # less than four bytes to move? - lda -4(g3),g3 # post-decrement src word addr - eshro g14,g6,g1 # extract 4 bytes of src - lda (LSW),MSW # move lsw to msw - subo 4,g4,g4 # pre-decrement dest ptr - bl.f Lcase.3_cloop # branch if < four bytes left to move - ld (g3),LSW # pre-fetch lsw of operand for double shift - subi 4,g2,g2 # decrease max.byte count by the 4 bytes moved - st g1,(g4) # store 4 bytes to dest - b Lcase.3_wloop - -Lcase.1_wloop: # word copying loop - subi 4,g2,g2 # decrease max.byte count by the 4 bytes moved - ld (g3),MSW # pre-fetch next word of src - subo 4,g3,g3 # post-decrement src addr - st g1,(g4) # store word in dest string -Lcase.1: # src and dest are word aligned - cmpi g2,4 # check for fewer than four bytes to move - subo 4,g4,g4 # pre-decrement dest addr - lda (MSW),g1 # keep a copy of the src word - bge.t Lcase.1_wloop # branch if at least four bytes to copy -Lcase.3_cloop: - cmpibe.f 0,g2,Lexit_code # Lexit if max_bytes is exhausted -#if ! __i960_BIG_ENDIAN__ - rotate 8,g1,g1 # move next byte into position for storing -#endif - lda 4(g4),g4 # pre-decremented dest addr 4 too much - -Lcase.1_cloop: - subi 1,g4,g4 # pre-decrement dest byte addr - cmpi g4,g0 # has dest ptr reached beginning of dest? - stob g1,(g4) # store the byte in dest -#if __i960_BIG_ENDIAN__ - shro 8,g1,g1 # move next byte into position for storing -#else - rotate 8,g1,g1 # move next byte into position for storing -#endif - bne.t Lcase.1_cloop # Lexit if move is completed - b Lexit_code - -Lcase.245: - cmpo g1,g4 # check alignment of dest - ld (MSW),MSW # pre-fetch word with at least last byte - and 3,g5,g5 # compute shift count - ld (g3),LSW # pre-fetch second to last word - shlo 3,g5,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,g5,g5 # is src earlier in word, later, or sync w/ dst - cmpo g1,g5 # < indicates last word of dest has less bytes - eshro g14,g6,g5 # extract four bytes - bl.t 1f - mov LSW,MSW -#if ! __i960_BIG_ENDIAN__ - be.t 1f -#endif - subo 4,g3,g3 # move src word addr to second word boundary -1: - mov g5,LSW - b Lcase.25 - - -Lquick_exit: - mov g14,g13 - b Lexit_code - -/* end of memmove */ |