| /*************************************************************************** |
| * __________ __ ___. |
| * Open \______ \ ____ ____ | | _\_ |__ _______ ___ |
| * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / |
| * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < |
| * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ |
| * \/ \/ \/ \/ \/ |
| * $Id$ |
| * |
| * Copyright (C) 2004-2005 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 memcpy |
| .global __memcpy_fwd_entry |
| .type memcpy,@function |
| |
| /* Copies <length> bytes of data in memory from <source> to <dest> |
| * This version is optimized for speed |
| * |
| * 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 end address (in line-copy loops) |
| * %d0 - data / scratch |
| * %d1 - source end address (byte and longword copy) / 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. |
| */ |
| memcpy: |
| move.l (4,%sp),%a1 /* Destination */ |
| move.l (8,%sp),%a0 /* Source */ |
| move.l (12,%sp),%d1 /* Length */ |
| |
| __memcpy_fwd_entry: |
| add.l %a0,%d1 /* %d1 = source end */ |
| |
| move.l %a0,%d0 |
| addq.l #7,%d0 |
| and.l #0xFFFFFFFC,%d0 /* %d0 = first source long bound + 4 */ |
| cmp.l %d0,%d1 /* at least one aligned longword to copy? */ |
| blo.w .bytes2_start /* no, jump directly to trailing byte loop */ |
| |
| subq.l #4,%d0 /* %d0 = first source long bound */ |
| cmp.l %a0,%d0 /* any bytes to copy? */ |
| jls .bytes1_end /* no: skip byte loop */ |
| |
| /* leading byte loop: copies 0..3 bytes */ |
| .bytes1_loop: |
| move.b (%a0)+,(%a1)+ /* copy byte */ |
| cmp.l %a0,%d0 /* runs %a0 up to first long bound */ |
| jhi .bytes1_loop |
| |
| .bytes1_end: |
| moveq.l #31,%d0 |
| add.l %a0,%d0 |
| and.l #0xFFFFFFF0,%d0 /* %d0 = first source line bound + 16 */ |
| cmp.l %d0,%d1 /* at least one aligned line to copy? */ |
| blo.w .long_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 |
| sub.l %d2,%d0 /* %d0 = first source line bound */ |
| move.l %d1,%a2 /* %a2 = end address */ |
| lea.l (-15,%a2),%a2 /* adjust end address for loops doing 16 bytes/ pass */ |
| move.l %a1,%d1 |
| moveq.l #3,%d2 /* mask */ |
| and.l %d2,%d1 |
| jmp.l (2,%pc,%d1.l*4) /* switch (dest_addr & 3) */ |
| bra.w .lines_do0_start |
| bra.w .lines_do1_start |
| bra.w .lines_do2_start |
| /* bra.w .lines_do3_start implicit */ |
| |
| /* byte aligned destination (long + 3): use line burst reads in main loop */ |
| .lines_do3_start: |
| moveq.l #24,%d1 /* shift count for shifting by 3 bytes */ |
| cmp.l %a0,%d0 /* any leading longwords? */ |
| jhi .lines_do3_head_start /* yes: leading longword copy */ |
| |
| movem.l (%a0),%d4-%d7 /* load first line */ |
| lea.l (16,%a0),%a0 |
| move.l %d4,%d2 |
| lsr.l %d1,%d2 /* get high byte of first longword */ |
| move.b %d2,(%a1)+ /* store byte */ |
| jra .lines_do3_entry /* jump into main loop */ |
| |
| .lines_do3_head_start: |
| move.l (%a0)+,%d7 /* load first longword */ |
| move.l %d7,%d2 |
| lsr.l %d1,%d2 /* get high byte */ |
| move.b %d2,(%a1)+ /* store byte */ |
| jra .lines_do3_head_entry /* jump into leading longword loop */ |
| |
| .lines_do3_head_loop: |
| move.l %d7,%d6 /* move old longword away */ |
| move.l (%a0)+,%d7 /* load new longword */ |
| move.l %d7,%d2 |
| lsr.l %d1,%d2 /* get high byte */ |
| or.l %d2,%d6 /* combine with old lower 3 bytes */ |
| move.l %d6,(%a1)+ /* store longword */ |
| .lines_do3_head_entry: |
| lsl.l #8,%d7 /* shift up lower 3 bytes */ |
| cmp.l %a0,%d0 /* runs %a0 up to first line bound */ |
| jhi .lines_do3_head_loop |
| |
| .lines_do3_loop: |
| move.l %d7,%d3 /* move last longword of old line away */ |
| movem.l (%a0),%d4-%d7 /* load new line */ |
| lea.l (16,%a0),%a0 |
| move.l %d4,%d2 |
| lsr.l %d1,%d2 /* get high byte of 1st longword */ |
| or.l %d2,%d3 /* combine with old lower 3 bytes */ |
| move.l %d3,(%a1)+ /* store longword */ |
| .lines_do3_entry: |
| lsl.l #8,%d4 /* shift up lower 3 bytes */ |
| move.l %d5,%d2 |
| lsr.l %d1,%d2 /* get high byte of 2nd longword */ |
| or.l %d2,%d4 /* combine with 1st lower 3 bytes */ |
| move.l %d4,(%a1)+ /* store longword */ |
| lsl.l #8,%d5 /* shift up lower 3 bytes */ |
| move.l %d6,%d2 |
| lsr.l %d1,%d2 /* get high byte of 3rd longword */ |
| or.l %d2,%d5 /* combine with 2nd lower 3 bytes */ |
| move.l %d5,(%a1)+ /* store longword */ |
| lsl.l #8,%d6 /* shift up lower 3 bytes */ |
| move.l %d7,%d2 |
| lsr.l %d1,%d2 /* get high byte of 4th longword */ |
| or.l %d2,%d6 /* combine with 3rd lower 3 bytes */ |
| move.l %d6,(%a1)+ /* store longword */ |
| lsl.l #8,%d7 /* shift up lower 3 bytes */ |
| cmp.l %a0,%a2 /* runs %a0 up to last line bound */ |
| jhi .lines_do3_loop |
| |
| lea.l (12,%a2),%a2 /* readjust end address for doing longwords */ |
| cmp.l %a0,%a2 /* any trailing longwords? */ |
| jls .lines_do3_tail_end /* no: just store last lower 3 bytes */ |
| |
| .lines_do3_tail_loop: |
| move.l %d7,%d6 /* move old longword away */ |
| move.l (%a0)+,%d7 /* load new longword */ |
| move.l %d7,%d2 |
| lsr.l %d1,%d2 /* get high byte */ |
| or.l %d2,%d6 /* combine with old lower 3 bytes */ |
| move.l %d6,(%a1)+ /* store longword */ |
| lsl.l #8,%d7 /* shift up lower 3 bytes */ |
| cmp.l %a0,%a2 /* runs %a0 up to last long bound */ |
| jhi .lines_do3_tail_loop |
| |
| .lines_do3_tail_end: |
| swap %d7 /* get high word */ |
| move.w %d7,(%a1)+ /* store word */ |
| lsr.l %d1,%d7 /* get moved-up low byte */ |
| move.b %d7,(%a1)+ /* store byte */ |
| jra .lines_end |
| |
| /* byte aligned destination (long + 1): use line burst reads in main loop */ |
| .lines_do1_start: |
| moveq.l #24,%d1 /* shift count for shifting by 3 bytes */ |
| cmp.l %a0,%d0 /* any leading longwords? */ |
| jhi .lines_do1_head_start /* yes: leading longword copy */ |
| |
| movem.l (%a0),%d4-%d7 /* load first line */ |
| lea.l (16,%a0),%a0 |
| move.l %d4,%d2 /* first longword, bytes 3210 */ |
| lsr.l #8,%d2 /* first longword, bytes .321 */ |
| swap %d2 /* first longword, bytes 21.3 */ |
| move.b %d2,(%a1)+ /* store byte */ |
| swap %d2 /* first longword, bytes .321 */ |
| move.w %d2,(%a1)+ /* store word */ |
| jra .lines_do1_entry |
| |
| .lines_do1_head_start: |
| move.l (%a0)+,%d7 /* load first longword */ |
| move.l %d7,%d2 /* first longword, bytes 3210 */ |
| lsr.l #8,%d2 /* first longword, bytes .321 */ |
| swap %d2 /* first longword, bytes 21.3 */ |
| move.b %d2,(%a1)+ /* store byte */ |
| swap %d2 /* first longword, bytes .321 */ |
| move.w %d2,(%a1)+ /* store word */ |
| jra .lines_do1_head_entry |
| |
| .lines_do1_head_loop: |
| move.l %d7,%d6 /* move old longword away */ |
| move.l (%a0)+,%d7 /* load new longword */ |
| move.l %d7,%d2 |
| lsr.l #8,%d2 /* get upper 3 bytes */ |
| or.l %d2,%d6 /* combine with old low byte */ |
| move.l %d6,(%a1)+ /* store longword */ |
| .lines_do1_head_entry: |
| lsl.l %d1,%d7 /* shift up low byte */ |
| cmp.l %a0,%d0 /* runs %a0 up to first line bound */ |
| jhi .lines_do1_head_loop |
| |
| .lines_do1_loop: |
| move.l %d7,%d3 /* move last longword of old line away */ |
| movem.l (%a0),%d4-%d7 /* load new line */ |
| lea.l (16,%a0),%a0 |
| move.l %d4,%d2 |
| lsr.l #8,%d2 /* get upper 3 bytes of 1st longword */ |
| or.l %d2,%d3 /* combine with low byte of old longword */ |
| move.l %d3,(%a1)+ /* store longword */ |
| .lines_do1_entry: |
| lsl.l %d1,%d4 /* shift up low byte */ |
| move.l %d5,%d2 |
| lsr.l #8,%d2 /* get upper 3 bytes of 2nd longword */ |
| or.l %d2,%d4 /* combine with low byte of 1st longword */ |
| move.l %d4,(%a1)+ /* store longword */ |
| lsl.l %d1,%d5 /* shift up low byte */ |
| move.l %d6,%d2 |
| lsr.l #8,%d2 /* get upper 3 bytes of 3rd longword */ |
| or.l %d2,%d5 /* combine with low byte of 2nd longword */ |
| move.l %d5,(%a1)+ /* store longword */ |
| lsl.l %d1,%d6 /* shift up low byte */ |
| move.l %d7,%d2 |
| lsr.l #8,%d2 /* get upper 3 bytes of 4th longword */ |
| or.l %d2,%d6 /* combine with low byte of 4th longword */ |
| move.l %d6,(%a1)+ /* store longword */ |
| lsl.l %d1,%d7 /* shift up low byte */ |
| cmp.l %a0,%a2 /* runs %a0 up to last line bound */ |
| jhi .lines_do1_loop |
| |
| lea.l (12,%a2),%a2 /* readjust end address for doing longwords */ |
| cmp.l %a0,%a2 /* any trailing longwords? */ |
| jls .lines_do1_tail_end /* no: just store last low byte */ |
| |
| .lines_do1_tail_loop: |
| move.l %d7,%d6 /* move old longword away */ |
| move.l (%a0)+,%d7 /* load new longword */ |
| move.l %d7,%d2 |
| lsr.l #8,%d2 /* get upper 3 bytes */ |
| or.l %d2,%d6 /* combine with old low byte */ |
| move.l %d6,(%a1)+ /* store longword */ |
| lsl.l %d1,%d7 /* shift up low byte */ |
| cmp.l %a0,%a2 /* runs %a0 up to last long bound */ |
| jhi .lines_do1_tail_loop |
| |
| .lines_do1_tail_end: |
| lsr.l %d1,%d7 /* get shifted-up low byte */ |
| move.b %d7,(%a1)+ /* store byte */ |
| jra .lines_end |
| |
| /* long aligned destination (line + 0/4/8/12): head */ |
| .lines_do0_head_loop: |
| move.l (%a0)+,(%a1)+ /* copy longword */ |
| .lines_do0_start: |
| cmp.l %a0,%d0 /* runs %a0 up to first line bound */ |
| jhi .lines_do0_head_loop |
| |
| .lines_do0_head_end: |
| move.l %a1,%d1 |
| lsr.l #2,%d1 |
| moveq.l #3,%d0 /* mask */ |
| and.l %d0,%d1 |
| moveq.l #16,%d0 /* address increment for one main loop pass */ |
| jmp.l (2,%pc,%d1.l*2) /* switch ((dest_addr >> 2) & 3) */ |
| bra.b .lines_lo0_start |
| bra.b .lines_lo4_start |
| bra.b .lines_lo8_start |
| /* bra.b .lines_lo12_start implicit */ |
| |
| /* long aligned destination (line + 12): use line bursts in the loop */ |
| .lines_lo12_start: |
| movem.l (%a0),%d4-%d7 /* load first line */ |
| add.l %d0,%a0 |
| move.l %d4,(%a1)+ /* store 1st longword */ |
| cmp.l %a0,%a2 /* any full lines? */ |
| jls .lines_lo12_end /* no: skip main loop */ |
| |
| .lines_lo12_loop: |
| move.l %d5,%d1 /* move last 3 longwords of old line away */ |
| move.l %d6,%d2 |
| move.l %d7,%d3 |
| movem.l (%a0),%d4-%d7 /* load new line */ |
| add.l %d0,%a0 |
| movem.l %d1-%d4,(%a1) /* store line (3 old + 1 new longwords) */ |
| add.l %d0,%a1 |
| cmp.l %a0,%a2 /* runs %a0 up to last line bound */ |
| jhi .lines_lo12_loop |
| |
| /* long aligned destination (line + 0/4/8/12): tail */ |
| .lines_lo12_end: |
| move.l %d5,(%a1)+ /* store 3rd last longword */ |
| .lines_lo8_end: |
| move.l %d6,(%a1)+ /* store 2nd last longword */ |
| .lines_lo4_end: |
| move.l %d7,(%a1)+ /* store last longword */ |
| .lines_lo0_end: |
| lea.l (12,%a2),%a2 /* readjust end address for doing longwords */ |
| cmp.l %a0,%a2 /* any trailing longwords? */ |
| jls .lines_end /* no: get outta here */ |
| |
| .lines_do0_tail_loop: |
| move.l (%a0)+,(%a1)+ /* copy longword */ |
| cmp.l %a0,%a2 /* runs %a0 up to last long bound */ |
| jhi .lines_do0_tail_loop |
| |
| jra .lines_end |
| |
| /* line aligned destination: use line bursts in the loop */ |
| .lines_lo0_start: |
| .lines_lo0_loop: |
| movem.l (%a0),%d4-%d7 /* load line */ |
| add.l %d0,%a0 |
| movem.l %d4-%d7,(%a1) /* store line */ |
| add.l %d0,%a1 |
| cmp.l %a0,%a2 /* runs %a0 up to last line bound */ |
| jhi .lines_lo0_loop |
| |
| jra .lines_lo0_end /* handle trailing longwords */ |
| |
| /* long aligned destination (line + 4): use line bursts in the loop */ |
| .lines_lo4_start: |
| movem.l (%a0),%d4-%d7 /* load first line */ |
| add.l %d0,%a0 |
| move.l %d4,(%a1)+ /* store 1st longword */ |
| move.l %d5,(%a1)+ /* store 2nd longword */ |
| move.l %d6,(%a1)+ /* store 3rd longword */ |
| cmp.l %a0,%a2 /* any full lines? */ |
| jls .lines_lo4_end /* no: skip main loop */ |
| |
| .lines_lo4_loop: |
| move.l %d7,%d3 /* move last longword of old line away */ |
| movem.l (%a0),%d4-%d7 /* load new line */ |
| add.l %d0,%a0 |
| movem.l %d3-%d6,(%a1) /* store line (1 old + 3 new longwords) */ |
| add.l %d0,%a1 |
| cmp.l %a0,%a2 /* runs %a0 up to last line bound */ |
| jhi .lines_lo4_loop |
| |
| jra .lines_lo4_end /* handle trailing longwords */ |
| |
| /* long aligned destination (line + 8): use line bursts in the loop */ |
| .lines_lo8_start: |
| movem.l (%a0),%d4-%d7 /* load first line */ |
| add.l %d0,%a0 |
| move.l %d4,(%a1)+ /* store 1st longword */ |
| move.l %d5,(%a1)+ /* store 2nd longword */ |
| cmp.l %a0,%a2 |
| jls .lines_lo8_end |
| |
| .lines_lo8_loop: |
| move.l %d6,%d2 /* move last 2 longwords of old line away */ |
| move.l %d7,%d3 |
| movem.l (%a0),%d4-%d7 /* load new line */ |
| add.l %d0,%a0 |
| movem.l %d2-%d5,(%a1) /* store line (2 old + 2 new longwords) */ |
| add.l %d0,%a1 |
| cmp.l %a0,%a2 /* runs %a0 up to last line bound */ |
| jhi .lines_lo8_loop |
| |
| jra .lines_lo8_end /* handle trailing longwords */ |
| |
| #ifdef FULLSPEED |
| |
| /* word aligned destination (line + 2/6/10/14): head */ |
| .lines_do2_start: |
| cmp.l %a0,%d0 /* any leading longwords? */ |
| jls .lines_do2_selector /* no: jump to mainloop selector */ |
| |
| move.l (%a0)+,%d7 /* load first longword */ |
| swap %d7 /* swap words */ |
| move.w %d7,(%a1)+ /* store high word */ |
| cmp.l %a0,%d0 /* any more longword? */ |
| jls .lines_do2_head_end /* no: skip head loop */ |
| |
| .lines_do2_head_loop: |
| move.l %d7,%d6 /* move old longword away */ |
| move.l (%a0)+,%d7 /* load new longword */ |
| swap %d7 /* swap words */ |
| move.w %d7,%d6 /* combine high word with old low word */ |
| move.l %d6,(%a1)+ /* store longword */ |
| cmp.l %a0,%d0 /* runs %a0 up to first line bound */ |
| jhi .lines_do2_head_loop |
| |
| .lines_do2_head_end: |
| swap %d7 /* undo swap */ |
| move.w %d7,(%a1)+ /* store word */ |
| |
| .lines_do2_selector: |
| move.l %a1,%d1 |
| lsr.l #2,%d1 |
| moveq.l #3,%d0 /* mask */ |
| and.l %d0,%d1 |
| moveq.l #16,%d0 /* address increment for one main loop pass */ |
| jmp.l (2,%pc,%d1.l*4) /* switch ((dest_addr >> 2) & 3) */ |
| bra.w .lines_lo2_start |
| bra.w .lines_lo6_start |
| bra.w .lines_lo10_start |
| /* bra.w .lines_lo14_start implicit */ |
| |
| /* word aligned destination (line + 14): use line bursts in the loop */ |
| .lines_lo14_start: |
| movem.l (%a0),%d4-%d7 /* load first line */ |
| add.l %d0,%a0 |
| swap %d4 /* swap words of 1st long */ |
| move.w %d4,(%a1)+ /* store word */ |
| jra .lines_lo14_entry /* jump into main loop */ |
| |
| .lines_lo14_loop: |
| move.l %d4,%d0 /* move old line away */ |
| move.l %d5,%d1 |
| move.l %d6,%d2 |
| move.l %d7,%d3 |
| movem.l (%a0),%d4-%d7 /* load new line */ |
| lea.l (16,%a0),%a0 |
| swap %d4 /* swap words of 1st long */ |
| move.w %d4,%d3 /* combine 1st high word with old low word */ |
| movem.l %d0-%d3,(%a1) /* store line */ |
| lea.l (16,%a1),%a1 |
| .lines_lo14_entry: |
| swap %d5 /* swap words of 2nd long */ |
| move.w %d5,%d4 /* combine 2nd high word with 1st low word */ |
| swap %d6 /* swap words of 3rd long */ |
| move.w %d6,%d5 /* combine 3rd high word with 2nd low word */ |
| swap %d7 /* swap words of 4th long */ |
| move.w %d7,%d6 /* combine 4th high word with 3rd low word */ |
| cmp.l %a0,%a2 /* runs %a0 up to last line bound */ |
| jhi .lines_lo14_loop |
| |
| /* word aligned destination (line + 2/6/10/14): tail */ |
| .lines_lo14_end: |
| move.l %d4,(%a1)+ /* store third last longword */ |
| .lines_lo10_end: |
| move.l %d5,(%a1)+ /* store second last longword */ |
| .lines_lo6_end: |
| move.l %d6,(%a1)+ /* store last longword */ |
| .lines_lo2_end: |
| lea.l (12,%a2),%a2 /* readjust end address for doing longwords */ |
| cmp.l %a0,%a2 /* any trailing longwords? */ |
| jls .lines_do2_tail_end /* no: skip tail loop */ |
| |
| .lines_do2_tail_loop: |
| move.l %d7,%d6 /* move old longword away */ |
| move.l (%a0)+,%d7 /* load new longword */ |
| swap %d7 /* swap words */ |
| move.w %d7,%d6 /* combine high word with old low word */ |
| move.l %d6,(%a1)+ /* store longword */ |
| cmp.l %a0,%a2 /* runs %a0 up to last long bound */ |
| jhi .lines_do2_tail_loop |
| |
| .lines_do2_tail_end: |
| swap %d7 /* undo swap */ |
| move.w %d7,(%a1)+ /* store last word */ |
| jra .lines_end |
| |
| /* word aligned destination (line + 2): use line bursts in the loop */ |
| .lines_lo2_start: |
| movem.l (%a0),%d4-%d7 /* load first line */ |
| add.l %d0,%a0 |
| swap %d4 /* swap words of 1st long */ |
| move.w %d4,(%a1)+ /* store high word */ |
| swap %d5 /* swap words of 2nd long */ |
| move.w %d5,%d4 /* combine 2nd high word with 1st low word */ |
| swap %d6 /* swap words of 3rd long */ |
| move.w %d6,%d5 /* combine 3nd high word with 2nd low word */ |
| swap %d7 /* swap words of 4th long */ |
| move.w %d7,%d6 /* combine 4th high word with 3rd low word */ |
| move.l %d4,(%a1)+ /* store 1st longword */ |
| move.l %d5,(%a1)+ /* store 2nd longword */ |
| move.l %d6,(%a1)+ /* store 3rd longword */ |
| cmp.l %a0,%a2 /* any full lines? */ |
| jls .lines_lo2_end /* no: skip main loop */ |
| |
| .lines_lo2_loop: |
| move.l %d7,%d3 /* move last longword of old line away */ |
| movem.l (%a0),%d4-%d7 /* load line */ |
| add.l %d0,%a0 |
| swap %d4 /* swap words of 1st long */ |
| move.w %d4,%d3 /* combine 1st high word with old low word */ |
| swap %d5 /* swap words of 2nd long */ |
| move.w %d5,%d4 /* combine 2nd high word with 1st low word */ |
| swap %d6 /* swap words of 3rd long */ |
| move.w %d6,%d5 /* combine 3rd high word with 2nd low word */ |
| swap %d7 /* swap words of 4th long */ |
| move.w %d7,%d6 /* combine 4th high word with 3rd low word */ |
| movem.l %d3-%d6,(%a1) /* store line */ |
| add.l %d0,%a1 |
| cmp.l %a0,%a2 /* runs %a0 up to last line bound */ |
| jhi .lines_lo2_loop |
| |
| jra .lines_lo2_end /* handle trailing longwords */ |
| |
| /* word aligned destination (line + 6): use line bursts in the loop */ |
| .lines_lo6_start: |
| movem.l (%a0),%d4-%d7 /* load first line */ |
| add.l %d0,%a0 |
| swap %d4 /* swap words of 1st long */ |
| move.w %d4,(%a1)+ /* store high word */ |
| swap %d5 /* swap words of 2nd long */ |
| move.w %d5,%d4 /* combine 2nd high word with 1st low word */ |
| swap %d6 /* swap words of 3rd long */ |
| move.w %d6,%d5 /* combine 3rd high word with 2nd low word */ |
| move.l %d4,(%a1)+ /* store 1st longword */ |
| move.l %d5,(%a1)+ /* store 2nd longword */ |
| jra .lines_lo6_entry /* jump into main loop */ |
| |
| .lines_lo6_loop: |
| move.l %d6,%d2 /* move last 2 longwords of old line away */ |
| move.l %d7,%d3 |
| movem.l (%a0),%d4-%d7 /* load line */ |
| add.l %d0,%a0 |
| swap %d4 /* swap words of 1st long */ |
| move.w %d4,%d3 /* combine 1st high word with old low word */ |
| swap %d5 /* swap words of 2nd long */ |
| move.w %d5,%d4 /* combine 2nd high word with 1st low word */ |
| swap %d6 /* swap words of 3rd long */ |
| move.w %d6,%d5 /* combine 3rd high word with 2nd low word */ |
| movem.l %d2-%d5,(%a1) /* store line */ |
| add.l %d0,%a1 |
| .lines_lo6_entry: |
| swap %d7 /* swap words of 4th long */ |
| move.w %d7,%d6 /* combine 4th high word with 3rd low word */ |
| cmp.l %a0,%a2 /* runs %a0 up to last line bound */ |
| jhi .lines_lo6_loop |
| |
| jra .lines_lo6_end /* handle trailing longwords */ |
| |
| /* word aligned destination (line + 10): use line bursts in the loop */ |
| .lines_lo10_start: |
| movem.l (%a0),%d4-%d7 /* load first line */ |
| add.l %d0,%a0 |
| swap %d4 /* swap words of 1st long */ |
| move.w %d4,(%a1)+ /* store high word */ |
| swap %d5 /* swap words of 2nd long */ |
| move.w %d5,%d4 /* combine 2nd high word with 1st low word */ |
| move.l %d4,(%a1)+ /* store 1st longword */ |
| jra .lines_lo10_entry /* jump into main loop */ |
| |
| .lines_lo10_loop: |
| move.l %d5,%d1 /* move last 3 longwords of old line away */ |
| move.l %d6,%d2 |
| move.l %d7,%d3 |
| movem.l (%a0),%d4-%d7 /* load line */ |
| add.l %d0,%a0 |
| swap %d4 /* swap words of 1st long */ |
| move.w %d4,%d3 /* combine 1st high word with old low word */ |
| swap %d5 /* swap words of 2nd long */ |
| move.w %d5,%d4 /* combine 2nd high word with 1st low word */ |
| movem.l %d1-%d4,(%a1) /* store line */ |
| add.l %d0,%a1 |
| .lines_lo10_entry: |
| swap %d6 /* swap words of 3rd long */ |
| move.w %d6,%d5 /* combine 3rd high word with 2nd low word */ |
| swap %d7 /* swap words of 4th long */ |
| move.w %d7,%d6 /* combine 4th high word with 3rd low word */ |
| cmp.l %a0,%a2 /* runs %a0 up to last line bound */ |
| jhi .lines_lo10_loop |
| |
| jra .lines_lo10_end /* handle trailing longwords */ |
| |
| #else /* !FULLSPEED */ |
| |
| /* word aligned destination (long + 2): use line burst reads in the loop */ |
| .lines_do2_start: |
| cmp.l %a0,%d0 /* any leading longwords? */ |
| jhi .lines_do2_head_start /* yes: leading longword copy */ |
| |
| movem.l (%a0),%d4-%d7 /* load first line */ |
| lea.l (16,%a0),%a0 |
| swap %d4 /* swap words of 1st long */ |
| move.w %d4,(%a1)+ /* store high word */ |
| jra .lines_do2_entry /* jump into main loop */ |
| |
| .lines_do2_head_start: |
| move.l (%a0)+,%d7 /* load first longword */ |
| swap %d7 /* swap words */ |
| move.w %d7,(%a1)+ /* store high word */ |
| cmp.l %a0,%d0 /* any full longword? */ |
| jls .lines_do2_loop /* no: skip head loop */ |
| |
| .lines_do2_head_loop: |
| move.l %d7,%d6 /* move old longword away */ |
| move.l (%a0)+,%d7 /* load new longword */ |
| swap %d7 /* swap words */ |
| move.w %d7,%d6 /* combine high word with old low word */ |
| move.l %d6,(%a1)+ /* store longword */ |
| cmp.l %a0,%d0 /* runs %a0 up to first line bound */ |
| jhi .lines_do2_head_loop |
| |
| .lines_do2_loop: |
| move.l %d7,%d3 /* move last longword of old line away */ |
| movem.l (%a0),%d4-%d7 /* load line */ |
| lea.l (16,%a0),%a0 |
| swap %d4 /* swap words of 1st long */ |
| move.w %d4,%d3 /* combine 1st high word with old low word */ |
| move.l %d3,(%a1)+ /* store 1st longword */ |
| .lines_do2_entry: |
| swap %d5 /* swap words of 2nd long */ |
| move.w %d5,%d4 /* combine 2nd high word with 1st low word */ |
| move.l %d4,(%a1)+ /* store 2nd longword */ |
| swap %d6 /* swap words of 3rd long */ |
| move.w %d6,%d5 /* combine 3rd high word with 2nd low word */ |
| move.l %d5,(%a1)+ /* store 3rd longword */ |
| swap %d7 /* swap words of 4th long */ |
| move.w %d7,%d6 /* combine 4th high word with 3rd low word */ |
| move.l %d6,(%a1)+ /* store 4th longword */ |
| cmp.l %a0,%a2 /* runs %a0 up to last line bound */ |
| jhi .lines_do2_loop |
| |
| .lines_do2_end: |
| lea.l (12,%a2),%a2 /* readjust end address for doing longwords */ |
| cmp.l %a0,%a2 /* any trailing longwords? */ |
| jls .lines_do2_tail_end /* no: skip tail loop */ |
| |
| .lines_do2_tail_loop: |
| move.l %d7,%d6 /* move old longword away */ |
| move.l (%a0)+,%d7 /* load new longword */ |
| swap %d7 /* swap words */ |
| move.w %d7,%d6 /* combine high word with old low word */ |
| move.l %d6,(%a1)+ /* store longword */ |
| cmp.l %a0,%a2 /* runs %a0 up to last long bound */ |
| jhi .lines_do2_tail_loop |
| |
| .lines_do2_tail_end: |
| swap %d7 /* undo swap */ |
| move.w %d7,(%a1)+ /* store last word */ |
| /* jra .lines_end implicit */ |
| |
| #endif /* !FULLSPEED */ |
| |
| .lines_end: |
| addq.l #3,%a2 /* readjust end address */ |
| move.l %a2,%d1 /* end address in %d1 again */ |
| movem.l (%sp),%d2-%d7/%a2 /* restore registers */ |
| lea.l (28,%sp),%sp |
| jra .bytes2_start /* jump to trailing byte loop */ |
| |
| .long_start: |
| subq.l #3,%d1 /* adjust end address for doing 4 bytes/ pass */ |
| |
| /* longword copy loop - no lines */ |
| .long_loop: |
| move.l (%a0)+,(%a1)+ /* copy longword (write can be unaligned) */ |
| cmp.l %a0,%d1 /* runs %a0 up to last long bound */ |
| jhi .long_loop |
| |
| addq.l #3,%d1 /* readjust end address */ |
| cmp.l %a0,%d1 /* any bytes left? */ |
| jls .bytes2_end /* no: skip trailing byte loop */ |
| |
| /* trailing byte loop */ |
| .bytes2_loop: |
| move.b (%a0)+,(%a1)+ /* copy byte */ |
| .bytes2_start: |
| cmp.l %a0,%d1 /* runs %a0 up to end address */ |
| jhi .bytes2_loop |
| |
| .bytes2_end: |
| move.l (4,%sp),%d0 /* return destination */ |
| rts |
| |
| .end: |
| .size memcpy,.end-memcpy |