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Coldfire: Assembler optimised memcpy(), 2.4x...10x (avg. 6.8x) as fast as the C version when copying large blocks within SDRAM.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7835 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2005-11-12 23:42:47 +00:00
parent 149a50d688
commit 83d3dcfd88
2 changed files with 649 additions and 19 deletions
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5
firmware/SOURCES
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@ -37,12 +37,9 @@ common/strncpy.c
common/strrchr.c
common/strtok.c
common/timefuncs.c
#if CONFIG_CPU == SH7034
#if (CONFIG_CPU == SH7034) || defined(CPU_COLDFIRE)
common/memcpy_a.S
common/memset_a.S
#elif defined(CPU_COLDFIRE)
common/memcpy.c
common/memset_a.S
#else
common/memcpy.c
common/memset.c

649
firmware/common/memcpy_a.S
View file

@ -215,26 +215,659 @@ _memcpy:
.end:
.size _memcpy,.end-_memcpy
#elif defined(CPU_COLDFIRE)
#define FULLSPEED /* use burst writing for word aligned destinations */
.align 2
.global memcpy
.type memcpy,@function
/* Copies <length> bytes of data in memory from <source> to <dest>
* This version is not optimized at all
* 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 */
add.l %a0,%d1 /* %d1 = end address */
cmp.l #0,%d1
bra.b .byteloopend
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 */
.byteloop:
move.b (%a0)+,(%a1)+
subq.l #1,%d1
.byteloopend:
bne.b .byteloop
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 long 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 */
lea.l (16,%a0),%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 lnogword? */
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
#endif