| /*************************************************************************** |
| * __________ __ ___. |
| * Open \______ \ ____ ____ | | _\_ |__ _______ ___ |
| * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / |
| * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < |
| * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ |
| * \/ \/ \/ \/ \/ |
| * $Id$ |
| * |
| * Copyright (C) 2006 by Jens Arnold |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version 2 |
| * of the License, or (at your option) any later version. |
| * |
| * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY |
| * KIND, either express or implied. |
| * |
| ****************************************************************************/ |
| #include "config.h" |
| |
| .section .icode,"ax",@progbits |
| |
| #define FULLSPEED /* use burst writing for word aligned destinations */ |
| .align 2 |
| .global memmove |
| .type memmove,@function |
| |
| /* Moves <length> bytes of data in memory from <source> to <dest> |
| * Regions may overlap. |
| * This version is optimized for speed, and needs the corresponding memcpy |
| * implementation for the forward copy branch. |
| * |
| * arguments: |
| * (4,%sp) - destination address |
| * (8,%sp) - source address |
| * (12,%sp) - length |
| * |
| * return value: |
| * %d0 - destination address (like ANSI version) |
| * |
| * register usage: |
| * %a0 - current source address |
| * %a1 - current dest address |
| * %a2 - source start address (in line-copy loops) |
| * %d0 - source start address (byte and longword copy) / data / scratch |
| * %d1 - data / scratch |
| * %d2 - data / scratch |
| * %d3..%d7 - data |
| * |
| * For maximum speed this routine reads and writes whole lines using burst |
| * move (movem.l) where possible. For byte aligned destinations (long-1 and |
| * long-3) it writes longwords only. Same goes for word aligned destinations |
| * if FULLSPEED is undefined. |
| */ |
| memmove: |
| move.l (4,%sp),%a1 /* Destination */ |
| move.l (8,%sp),%a0 /* Source */ |
| move.l (12,%sp),%d1 /* Length */ |
| |
| cmp.l %a0,%a1 |
| bhi.b .backward /* dest > src -> backward copy */ |
| jmp __memcpy_fwd_entry |
| |
| .backward: |
| move.l %a0,%d0 /* %d0 = source start */ |
| add.l %d1,%a0 /* %a0 = source end */ |
| add.l %d1,%a1 /* %a1 = destination end */ |
| |
| move.l %a0,%d1 |
| and.l #0xFFFFFFFC,%d1 /* %d1 = last source long bound */ |
| subq.l #4,%d1 |
| cmp.l %d0,%d1 /* at least one aligned longword to copy? */ |
| blo.w .bytes2r_start |
| |
| addq.l #4,%d1 /* %d1 = last source long bound */ |
| cmp.l %d1,%a0 /* any bytes to copy */ |
| jls .bytes1r_end /* no: skip byte loop */ |
| |
| /* leading byte loop: copies 0..3 bytes */ |
| .bytes1r_loop: |
| move.b -(%a0),-(%a1) /* copy byte */ |
| cmp.l %d1,%a0 /* runs %a0 down to last long bound */ |
| jhi .bytes1r_loop |
| |
| .bytes1r_end: |
| moveq.l #-16,%d1 |
| add.l %a0,%d1 |
| and.l #0xFFFFFFF0,%d1 /* %d1 = last source line bound - 16 */ |
| cmp.l %d0,%d1 /* at least one aligned line to copy? */ |
| blo.w .longr_start /* no: jump to longword copy loop */ |
| |
| lea.l (-28,%sp),%sp /* free up some registers */ |
| movem.l %d2-%d7/%a2,(%sp) |
| |
| moveq.l #16,%d2 |
| add.l %d2,%d1 /* %d1 = last source line bound */ |
| move.l %d0,%a2 /* %a2 = start address */ |
| lea.l (15,%a2),%a2 /* adjust start address for loops doing 16 bytes/pass */ |
| move.l %a1,%d0 |
| moveq.l #3,%d2 /* mask */ |
| and.l %d2,%d0 |
| jmp.l (2,%pc,%d0.l*4) /* switch (dest_addr & 3) */ |
| bra.w .lines_do0r_start |
| bra.w .lines_do1r_start |
| bra.w .lines_do2r_start |
| /* bra.w .lines_do3r_start implicit */ |
| |
| /* byte aligned destination (long - 1): use line burst reads in main loop */ |
| .lines_do3r_start: |
| moveq.l #24,%d0 /* shift count for shifting by 3 bytes */ |
| cmp.l %d1,%a0 /* any leading longwords? */ |
| jhi .lines_do3r_head_start /* yes: leading longword copy */ |
| |
| lea.l (-16,%a0),%a0 |
| movem.l (%a0),%d3-%d6 /* load initial line */ |
| move.l %d6,%d2 /* last longword, bytes 3210 */ |
| move.b %d2,-(%a1) /* store byte */ |
| lsr.l #8,%d2 /* last longword, bytes .321 */ |
| move.w %d2,-(%a1) /* store word */ |
| jra .lines_do3r_entry |
| |
| .lines_do3r_head_start: |
| move.l -(%a0),%d3 /* load initial longword */ |
| move.l %d3,%d2 /* bytes 3210 */ |
| move.b %d2,-(%a1) /* store byte */ |
| lsr.l #8,%d2 /* bytes .321 */ |
| move.w %d2,-(%a1) /* store word */ |
| jra .lines_do3r_head_entry |
| |
| .lines_do3r_head_loop: |
| move.l %d3,%d4 /* move old longword away */ |
| move.l -(%a0),%d3 /* load new longword */ |
| move.l %d3,%d2 |
| lsl.l #8,%d2 /* get bytes 210. */ |
| or.l %d2,%d4 /* combine with old high byte */ |
| move.l %d4,-(%a1) /* store longword */ |
| .lines_do3r_head_entry: |
| lsr.l %d0,%d3 /* shift down high byte */ |
| cmp.l %d1,%a0 /* run %a0 down to last line bound */ |
| jhi .lines_do3r_head_loop |
| |
| .lines_do3r_loop: |
| move.l %d3,%d7 /* move first longword of last line away */ |
| lea.l (-16,%a0),%a0 |
| movem.l (%a0),%d3-%d6 /* load new line */ |
| move.l %d6,%d2 |
| lsl.l #8,%d2 /* get bytes 210. of 4th longword */ |
| or.l %d2,%d7 /* combine with high byte of old longword */ |
| move.l %d7,-(%a1) /* store longword */ |
| .lines_do3r_entry: |
| lsr.l %d0,%d6 /* shift down high byte */ |
| move.l %d5,%d2 |
| lsl.l #8,%d2 /* get bytes 210. of 3rd longword */ |
| or.l %d2,%d6 /* combine with high byte of 4th longword */ |
| move.l %d6,-(%a1) /* store longword */ |
| lsr.l %d0,%d5 /* shift down high byte */ |
| move.l %d4,%d2 |
| lsl.l #8,%d2 /* get bytes 210. of 2nd longword */ |
| or.l %d2,%d5 /* combine with high byte or 3rd longword */ |
| move.l %d5,-(%a1) /* store longword */ |
| lsr.l %d0,%d4 /* shift down high byte */ |
| move.l %d3,%d2 |
| lsl.l #8,%d2 /* get bytes 210. of 1st longword */ |
| or.l %d2,%d4 /* combine with high byte of 2nd longword */ |
| move.l %d4,-(%a1) /* store longword */ |
| lsr.l %d0,%d3 /* shift down high byte */ |
| cmp.l %a2,%a0 /* run %a0 down to first line bound */ |
| jhi .lines_do3r_loop |
| |
| lea.l (-12,%a2),%a2 /* readjust start address for doing longwords */ |
| cmp.l %a2,%a0 /* any trailing longwords? */ |
| jls .lines_do3r_tail_end /* no: just store last high byte */ |
| |
| .lines_do3r_tail_loop: |
| move.l %d3,%d4 /* move old longword away */ |
| move.l -(%a0),%d3 /* load new longword */ |
| move.l %d3,%d2 |
| lsl.l #8,%d2 /* get bytes 210. */ |
| or.l %d2,%d4 /* combine with old high byte */ |
| move.l %d4,-(%a1) /* store longword */ |
| lsr.l %d0,%d3 /* shift down high byte */ |
| cmp.l %a2,%a0 /* run %a0 down to first long bound */ |
| jhi .lines_do3r_tail_loop |
| |
| .lines_do3r_tail_end: |
| move.b %d3,-(%a1) /* store shifted-down high byte */ |
| jra .linesr_end |
| |
| /* byte aligned destination (long - 3): use line burst reads in main loop */ |
| .lines_do1r_start: |
| moveq.l #24,%d0 /* shift count for shifting by 3 bytes */ |
| cmp.l %d1,%a0 /* any leading longwords? */ |
| jhi .lines_do1r_head_start /* yes: leading longword copy */ |
| |
| lea.l (-16,%a0),%a0 |
| movem.l (%a0),%d3-%d6 /* load initial line */ |
| move.b %d6,-(%a1) /* store low byte of last longword */ |
| jra .lines_do1r_entry |
| |
| .lines_do1r_head_start: |
| move.l -(%a0),%d3 /* load initial longword */ |
| move.b %d3,-(%a1) /* store low byte */ |
| jra .lines_do1r_head_entry |
| |
| .lines_do1r_head_loop: |
| move.l %d3,%d4 /* move old longword away */ |
| move.l -(%a0),%d3 /* load new longword */ |
| move.l %d3,%d2 |
| lsl.l %d0,%d2 /* get low byte */ |
| or.l %d2,%d4 /* combine with old bytes .321 */ |
| move.l %d4,-(%a1) /* store longword */ |
| .lines_do1r_head_entry: |
| lsr.l #8,%d3 /* get bytes .321 */ |
| cmp.l %d1,%a0 /* run %a0 down to last line bound */ |
| jhi .lines_do1r_head_loop |
| |
| .lines_do1r_loop: |
| move.l %d3,%d7 /* move first longword of old line away */ |
| lea.l (-16,%a0),%a0 |
| movem.l (%a0),%d3-%d6 /* load new line */ |
| move.l %d6,%d2 |
| lsl.l %d0,%d2 /* get low byte of 4th longword */ |
| or.l %d2,%d7 /* combine with bytes .321 of old longword */ |
| move.l %d7,-(%a1) /* store longword */ |
| .lines_do1r_entry: |
| lsr.l #8,%d6 /* get bytes .321 */ |
| move.l %d5,%d2 |
| lsl.l %d0,%d2 /* get low byte of 3rd longword */ |
| or.l %d2,%d6 /* combine with bytes .321 of 4th longword */ |
| move.l %d6,-(%a1) /* store longword */ |
| lsr.l #8,%d5 /* get bytes .321 */ |
| move.l %d4,%d2 |
| lsl.l %d0,%d2 /* get low byte of 2nd longword */ |
| or.l %d2,%d5 /* combine with bytes .321 of 3rd longword */ |
| move.l %d5,-(%a1) /* store longword */ |
| lsr.l #8,%d4 /* get bytes .321 */ |
| move.l %d3,%d2 |
| lsl.l %d0,%d2 /* get low byte of 1st longword */ |
| or.l %d2,%d4 /* combine with bytes .321 of 2nd longword */ |
| move.l %d4,-(%a1) /* store longword */ |
| lsr.l #8,%d3 /* get bytes .321 */ |
| cmp.l %a2,%a0 /* run %a0 down to first line bound */ |
| jhi .lines_do1r_loop |
| |
| lea.l (-12,%a2),%a2 /* readjust start address for doing longwords */ |
| cmp.l %a2,%a0 /* any trailing longwords? */ |
| jls .lines_do1r_tail_end /* no: just store last high byte */ |
| |
| .lines_do1r_tail_loop: |
| move.l %d3,%d4 /* move old longword away */ |
| move.l -(%a0),%d3 /* load new longword */ |
| move.l %d3,%d2 |
| lsl.l %d0,%d2 /* get low byte */ |
| or.l %d2,%d4 /* combine with old bytes .321 */ |
| move.l %d4,-(%a1) /* store longword */ |
| lsr.l #8,%d3 /* get bytes .321 */ |
| cmp.l %a2,%a0 /* run %a0 down to first long bound */ |
| jhi .lines_do1r_tail_loop |
| |
| .lines_do1r_tail_end: |
| move.w %d3,-(%a1) /* store word 21 */ |
| swap %d3 |
| move.b %d3,-(%a1) /* store byte 3 */ |
| jra .linesr_end |
| |
| /* long aligned destination (line - 0/4/8/12): head */ |
| .lines_do0r_head_loop: |
| move.l -(%a0),-(%a1) /* copy longword */ |
| .lines_do0r_start: |
| cmp.l %d1,%a0 /* run %a0 down to last line bound */ |
| jhi .lines_do0r_head_loop |
| |
| .lines_do0r_head_end: |
| move.l %a1,%d1 |
| lsr.l #2,%d1 |
| moveq.l #3,%d0 /* mask */ |
| and.l %d0,%d1 |
| moveq.l #16,%d0 /* address decrement for one main loop pass */ |
| jmp.l (2,%pc,%d1.l*2) /* switch ((dest_addr >> 2) & 3) */ |
| bra.b .lines_lo0r_start |
| bra.b .lines_lo4r_start |
| bra.b .lines_lo8r_start |
| /* bra.b .lines_lo12r_start implicit */ |
| |
| /* long aligned destination (line - 4): use line bursts in the loop */ |
| .lines_lo12r_start: |
| sub.l %d0,%a0 |
| movem.l (%a0),%d1-%d4 /* load initial line */ |
| move.l %d4,-(%a1) /* store 4th longword */ |
| move.l %d3,-(%a1) /* store 3rd longword */ |
| move.l %d2,-(%a1) /* store 2nd longword */ |
| cmp.l %a2,%a0 /* any full lines? */ |
| jls .lines_lo12r_end /* no: skip main loop */ |
| |
| .lines_lo12r_loop: |
| move.l %d1,%d5 /* move first longword of old line away */ |
| sub.l %d0,%a0 |
| movem.l (%a0),%d1-%d4 /* load new line */ |
| sub.l %d0,%a1 |
| movem.l %d2-%d5,(%a1) /* store line (1 old + 3 new longwords */ |
| cmp.l %a2,%a0 /* run %a0 down to first line bound */ |
| jhi .lines_lo12r_loop |
| |
| jra .lines_lo12r_end /* handle trailing longwords */ |
| |
| /* line aligned destination: use line bursts in the loop */ |
| .lines_lo0r_start: |
| .lines_lo0r_loop: |
| sub.l %d0,%a0 |
| movem.l (%a0),%d1-%d4 /* load line */ |
| sub.l %d0,%a1 |
| movem.l %d1-%d4,(%a1) /* store line */ |
| cmp.l %a2,%a0 /* run %a0 down to first line bound */ |
| jhi .lines_lo0r_loop |
| |
| jra .lines_lo0r_end /* handle trailing longwords */ |
| |
| /* long aligned destination (line - 8): use line bursts in the loop */ |
| .lines_lo8r_start: |
| sub.l %d0,%a0 |
| movem.l (%a0),%d1-%d4 /* load initial line */ |
| move.l %d4,-(%a1) /* store 4th longword */ |
| move.l %d3,-(%a1) /* store 3rd longword */ |
| cmp.l %a2,%a0 /* any full lines? */ |
| jls .lines_lo8r_end /* no: skip main loop */ |
| |
| .lines_lo8r_loop: |
| move.l %d2,%d6 /* move first 2 longwords of old line away */ |
| move.l %d1,%d5 |
| sub.l %d0,%a0 |
| movem.l (%a0),%d1-%d4 /* load new line */ |
| sub.l %d0,%a1 |
| movem.l %d3-%d6,(%a1) /* store line (2 old + 2 new longwords */ |
| cmp.l %a2,%a0 /* run %a0 down to first line bound */ |
| jhi .lines_lo8r_loop |
| |
| jra .lines_lo8r_end /* handle trailing longwords */ |
| |
| /* long aligned destination (line - 12): use line bursts in the loop */ |
| .lines_lo4r_start: |
| sub.l %d0,%a0 |
| movem.l (%a0),%d1-%d4 /* load initial line */ |
| move.l %d4,-(%a1) /* store 4th longword */ |
| cmp.l %a2,%a0 /* any full lines? */ |
| jls .lines_lo4r_end /* no: skip main loop */ |
| |
| .lines_lo4r_loop: |
| move.l %d3,%d7 /* move first 3 longwords of old line away */ |
| move.l %d2,%d6 |
| move.l %d1,%d5 |
| sub.l %d0,%a0 |
| movem.l (%a0),%d1-%d4 /* load new line */ |
| sub.l %d0,%a1 |
| movem.l %d4-%d7,(%a1) /* store line (3 old + 1 new longwords */ |
| cmp.l %a2,%a0 /* run %a0 down to first line bound */ |
| jhi .lines_lo4r_loop |
| |
| /* long aligned destination (line - 0/4/8/12): tail */ |
| .lines_lo4r_end: |
| move.l %d3,-(%a1) /* store 3rd last longword */ |
| .lines_lo8r_end: |
| move.l %d2,-(%a1) /* store 2nd last longword */ |
| .lines_lo12r_end: |
| move.l %d1,-(%a1) /* store last longword */ |
| .lines_lo0r_end: |
| lea.l (-12,%a2),%a2 /* readjust end address for doing longwords */ |
| cmp.l %a2,%a0 /* any trailing longwords? */ |
| jls .linesr_end /* no: get outta here */ |
| |
| .lines_do0r_tail_loop: |
| move.l -(%a0),-(%a1) /* copy longword */ |
| cmp.l %a2,%a0 /* run %a0 down to first long bound */ |
| jhi .lines_do0r_tail_loop |
| |
| jra .linesr_end |
| |
| #ifdef FULLSPEED |
| /* word aligned destination (line - 2/6/10/14): head */ |
| .lines_do2r_start: |
| cmp.l %d1,%a0 /* any leading longwords? */ |
| jls .lines_do2r_selector /* no: jump to mainloop selector */ |
| |
| move.l -(%a0),%d3 /* load initial longword */ |
| move.w %d3,-(%a1) /* store low word */ |
| cmp.l %d1,%a0 /* any more longwords? */ |
| jls .lines_do2r_head_end /* no: skip head loop */ |
| |
| .lines_do2r_head_loop: |
| move.l %d3,%d4 /* move old longword away */ |
| move.l -(%a0),%d3 /* load new longword */ |
| move.w %d3,%d4 /* combine low word with old high word */ |
| swap %d4 /* swap words */ |
| move.l %d4,-(%a1) /* store longword */ |
| cmp.l %d1,%a0 /* run %a0 down to last line bound */ |
| jhi .lines_do2r_head_loop |
| |
| .lines_do2r_head_end: |
| swap %d3 /* get high word */ |
| move.w %d3,-(%a1) /* and store it */ |
| |
| .lines_do2r_selector: |
| move.l %a1,%d1 |
| lsr.l #2,%d1 |
| moveq.l #3,%d0 /* mask */ |
| and.l %d0,%d1 |
| moveq.l #16,%d7 /* address decrement for one main loop pass */ |
| jmp.l (2,%pc,%d1.l*4) /* switch ((dest_addr >> 2) & 3) */ |
| bra.w .lines_lo2r_start |
| bra.w .lines_lo6r_start |
| bra.w .lines_lo10r_start |
| /* bra.w .lines_lo14r_start implicit */ |
| |
| /* word aligned destination (line - 2): use line bursts in the loop */ |
| .lines_lo14r_start: |
| sub.l %d7,%a0 |
| movem.l (%a0),%d0-%d3 /* load initial line */ |
| move.w %d3,-(%a1) /* store last low word */ |
| move.w %d2,%d3 /* combine 3rd low word with 4th high word */ |
| swap %d3 /* swap words of 3rd long */ |
| move.w %d1,%d2 /* combine 2nd low word with 3rd high word */ |
| swap %d2 /* swap words of 2nd long */ |
| move.w %d0,%d1 /* combine 1st low word with 2nd high word */ |
| swap %d1 /* swap words of 1st long */ |
| move.l %d3,-(%a1) /* store 3rd longword */ |
| move.l %d2,-(%a1) /* store 2nd longword */ |
| move.l %d1,-(%a1) /* store 1st longword */ |
| cmp.l %a2,%a0 /* any full lines? */ |
| jls .lines_lo14r_end /* no: skip main loop */ |
| |
| .lines_lo14r_loop: |
| move.l %d0,%d4 /* move first longword of old line away */ |
| sub.l %d7,%a0 |
| movem.l (%a0),%d0-%d3 /* load line */ |
| move.w %d3,%d4 /* combine 4th low word with old high word */ |
| swap %d4 /* swap words of 4th long */ |
| move.w %d2,%d3 /* combine 3rd low word with 4th high word */ |
| swap %d3 /* swap words of 3rd long */ |
| move.w %d1,%d2 /* combine 2nd low word with 3rd high word */ |
| swap %d2 /* swap words of 2nd long */ |
| move.w %d0,%d1 /* combine 1st low word with 2nd high word */ |
| swap %d1 /* swap words of 1st long */ |
| sub.l %d7,%a1 |
| movem.l %d1-%d4,(%a1) /* store line */ |
| cmp.l %a2,%a0 /* run %a0 down to first line bound */ |
| jhi .lines_lo14r_loop |
| |
| jra .lines_lo14r_end /* handle trailing longwords */ |
| |
| /* word aligned destination (line - 6): use line bursts in the loop */ |
| .lines_lo10r_start: |
| sub.l %d7,%a0 |
| movem.l (%a0),%d0-%d3 /* load initial line */ |
| move.w %d3,-(%a1) /* store last low word */ |
| move.w %d2,%d3 /* combine 3rd low word with 4th high word */ |
| swap %d3 /* swap words of 3rd long */ |
| move.w %d1,%d2 /* combine 2nd low word with 3rd high word */ |
| swap %d2 /* swap words of 2nd long */ |
| move.l %d3,-(%a1) /* store 3rd longword */ |
| move.l %d2,-(%a1) /* store 2nd longword */ |
| jra .lines_lo10r_entry /* jump into main loop */ |
| |
| .lines_lo10r_loop: |
| move.l %d0,%d4 /* move first 2 longwords of old line away */ |
| move.l %d1,%d5 |
| sub.l %d7,%a0 |
| movem.l (%a0),%d0-%d3 /* load line */ |
| move.w %d3,%d4 /* combine 4th low word with old high word */ |
| swap %d4 /* swap words of 4th long */ |
| move.w %d2,%d3 /* combine 3rd low word with 4th high word */ |
| swap %d3 /* swap words of 3rd long */ |
| move.w %d1,%d2 /* combine 2nd low word with 3rd high word */ |
| swap %d2 /* swap words of 2nd long */ |
| sub.l %d7,%a1 |
| movem.l %d2-%d5,(%a1) /* store line */ |
| .lines_lo10r_entry: |
| move.w %d0,%d1 /* combine 1st low word with 2nd high word */ |
| swap %d1 /* swap words of 1st long */ |
| cmp.l %a2,%a0 /* run %a0 down to first line bound */ |
| jhi .lines_lo10r_loop |
| |
| jra .lines_lo10r_end /* handle trailing longwords */ |
| |
| /* word aligned destination (line - 10): use line bursts in the loop */ |
| .lines_lo6r_start: |
| sub.l %d7,%a0 |
| movem.l (%a0),%d0-%d3 /* load initial line */ |
| move.w %d3,-(%a1) /* store last low word */ |
| move.w %d2,%d3 /* combine 3rd low word with 4th high word */ |
| swap %d3 /* swap words of 3rd long */ |
| move.l %d3,-(%a1) /* store 3rd longword */ |
| jra .lines_lo6r_entry /* jump into main loop */ |
| |
| .lines_lo6r_loop: |
| move.l %d0,%d4 /* move first 3 longwords of old line away */ |
| move.l %d1,%d5 |
| move.l %d2,%d6 |
| sub.l %d7,%a0 |
| movem.l (%a0),%d0-%d3 /* load line */ |
| move.w %d3,%d4 /* combine 4th low word with old high word */ |
| swap %d4 /* swap words of 4th long */ |
| move.w %d2,%d3 /* combine 3rd low word with 4th high word */ |
| swap %d3 /* swap words of 3rd long */ |
| sub.l %d7,%a1 |
| movem.l %d3-%d6,(%a1) /* store line */ |
| .lines_lo6r_entry: |
| move.w %d1,%d2 /* combine 2nd low word with 3rd high word */ |
| swap %d2 /* swap words of 2nd long */ |
| move.w %d0,%d1 /* combine 1st low word with 2nd high word */ |
| swap %d1 /* swap words of 1st long */ |
| cmp.l %a2,%a0 /* run %a0 down to first line bound */ |
| jhi .lines_lo6r_loop |
| |
| jra .lines_lo6r_end /* handle trailing longwords */ |
| |
| /* word aligned destination (line - 14): use line bursts in the loop */ |
| .lines_lo2r_start: |
| sub.l %d7,%a0 |
| movem.l (%a0),%d0-%d3 /* load initial line */ |
| move.w %d3,-(%a1) /* store last low word */ |
| jra .lines_lo2r_entry /* jump into main loop */ |
| |
| .lines_lo2r_loop: |
| move.l %d0,%d4 /* move old line away */ |
| move.l %d1,%d5 |
| move.l %d2,%d6 |
| move.l %d3,%d7 |
| lea.l (-16,%a0),%a0 |
| movem.l (%a0),%d0-%d3 /* load line */ |
| move.w %d3,%d4 /* combine 4th low word with old high word */ |
| swap %d4 /* swap words of 4th long */ |
| lea.l (-16,%a1),%a1 |
| movem.l %d4-%d7,(%a1) /* store line */ |
| .lines_lo2r_entry: |
| move.w %d2,%d3 /* combine 3rd low word with 4th high word */ |
| swap %d3 /* swap words of 3rd long */ |
| move.w %d1,%d2 /* combine 2nd low word with 3rd high word */ |
| swap %d2 /* swap words of 2nd long */ |
| move.w %d0,%d1 /* combine 1st low word with 2nd high word */ |
| swap %d1 /* swap words of 1st long */ |
| cmp.l %a2,%a0 /* run %a0 down to first line bound */ |
| jhi .lines_lo2r_loop |
| |
| /* word aligned destination (line - 2/6/10/14): tail */ |
| .lines_lo2r_end: |
| move.l %d3,-(%a1) /* store third last longword */ |
| .lines_lo6r_end: |
| move.l %d2,-(%a1) /* store second last longword */ |
| .lines_lo10r_end: |
| move.l %d1,-(%a1) /* store last longword */ |
| .lines_lo14r_end: |
| lea.l (-12,%a2),%a2 /* readjust start address for doing longwords */ |
| cmp.l %a2,%a0 /* any trailing longwords? */ |
| jls .lines_do2r_tail_end /* no: skip tail loop */ |
| |
| .lines_do2r_tail_loop: |
| move.l %d0,%d1 /* move old longword away */ |
| move.l -(%a0),%d0 /* load new longword */ |
| move.w %d0,%d1 /* combine low word with old high word */ |
| swap %d1 /* swap words */ |
| move.l %d1,-(%a1) /* store longword */ |
| cmp.l %a2,%a0 /* run %a0 down to first long bound */ |
| jhi .lines_do2r_tail_loop |
| |
| .lines_do2r_tail_end: |
| swap %d0 /* get final high word */ |
| move.w %d0,-(%a1) /* store it */ |
| /* jra .linesr_end implicit */ |
| |
| #else /* !FULLSPEED */ |
| |
| /* word aligned destination (long - 2): use line burst reads in the loop */ |
| .lines_do2r_start: |
| cmp.l %d1,%a0 /* any leading longwords? */ |
| jhi .lines_do2r_head_start /* yes: leading longword copy */ |
| |
| lea.l (-16,%a0),%a0 |
| movem.l (%a0),%d3-%d6 /* load initial line */ |
| move.w %d6,-(%a1) /* store last low word */ |
| jra .lines_do2r_entry /* jump into main loop */ |
| |
| .lines_do2r_head_start: |
| move.l -(%a0),%d3 /* load initial longword */ |
| move.w %d3,-(%a1) /* store low word */ |
| cmp.l %d1,%a0 /* any full longword? */ |
| jls .lines_do2r_loop /* no: skip head loop */ |
| |
| .lines_do2r_head_loop: |
| move.l %d3,%d4 /* move old longword away */ |
| move.l -(%a0),%d3 /* load new longword */ |
| move.w %d3,%d4 /* combine low word with old high word */ |
| swap %d4 /* swap words */ |
| move.l %d4,-(%a1) /* store longword */ |
| cmp.l %d1,%a0 /* run %a0 down to last line bound */ |
| jhi .lines_do2r_head_loop |
| |
| .lines_do2r_loop: |
| move.l %d3,%d7 /* move first longword of old line away */ |
| lea.l (-16,%a0),%a0 |
| movem.l (%a0),%d3-%d6 /* load line */ |
| move.w %d6,%d7 /* combine 4th low word with old high word */ |
| swap %d7 /* swap words of 4th long */ |
| move.l %d7,-(%a1) /* store 4th longword */ |
| .lines_do2r_entry: |
| move.w %d5,%d6 /* combine 3rd low word with 4th high word */ |
| swap %d6 /* swap words of 3rd long */ |
| move.l %d6,-(%a1) /* store 3rd longword */ |
| move.w %d4,%d5 /* combine 2nd low word with 3rd high word */ |
| swap %d5 /* swap words of 2nd long */ |
| move.l %d5,-(%a1) /* store 2nd longword */ |
| move.w %d3,%d4 /* combine 1st low word with 2nd high word */ |
| swap %d4 /* swap words of 1st long */ |
| move.l %d4,-(%a1) /* store 1st longword */ |
| cmp.l %a2,%a0 /* run %a0 down to first line bound */ |
| jhi .lines_do2r_loop |
| |
| .lines_do2r_end: |
| lea.l (-12,%a2),%a2 /* readjust start address for doing longwords */ |
| cmp.l %a2,%a0 /* any trailing longwords? */ |
| jls .lines_do2r_tail_end /* no: skip tail loop */ |
| |
| .lines_do2r_tail_loop: |
| move.l %d3,%d4 /* move old longword away */ |
| move.l -(%a0),%d3 /* load new longword */ |
| move.w %d3,%d4 /* combine low word with old high word */ |
| swap %d4 /* swap words */ |
| move.l %d4,-(%a1) /* store longword */ |
| cmp.l %a2,%a0 /* run %a0 down to first long bound */ |
| jhi .lines_do2r_tail_loop |
| |
| .lines_do2r_tail_end: |
| swap %d3 /* get final high word */ |
| move.w %d3,-(%a1) /* store it */ |
| /* jra .linesr_end implicit */ |
| |
| #endif /* !FULLSPEED */ |
| |
| .linesr_end: |
| subq.l #3,%a2 /* readjust end address */ |
| move.l %a2,%d0 /* start address in %d0 again */ |
| movem.l (%sp),%d2-%d7/%a2 /* restore registers */ |
| lea.l (28,%sp),%sp |
| jra .bytes2r_start /* jump to trailing byte loop */ |
| |
| .longr_start: |
| addq.l #3,%d0 /* adjust start address for doing 4 bytes/ pass */ |
| |
| /* longword copy loop - no lines */ |
| .longr_loop: |
| move.l -(%a0),-(%a1) /* copy longword (write can be unaligned) */ |
| cmp.l %d0,%a0 /* runs %a0 down to first long bound */ |
| jhi .longr_loop |
| |
| subq.l #3,%d0 /* readjust start address */ |
| cmp.l %d0,%a0 /* any bytes left? */ |
| jls .bytes2r_end /* no: skip trailing byte loop */ |
| |
| /* trailing byte loop */ |
| .bytes2r_loop: |
| move.b -(%a0),-(%a1) /* copy byte */ |
| .bytes2r_start: |
| cmp.l %d0,%a0 /* runs %a0 down to start address */ |
| jhi .bytes2r_loop |
| |
| .bytes2r_end: |
| rts /* returns start address */ |
| |
| .end: |
| .size memmove,.end-memmove |