e2022a26d0
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@11967 a1c6a512-1295-4272-9138-f99709370657
680 lines
27 KiB
ArmAsm
680 lines
27 KiB
ArmAsm
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2004-2005 by Jens Arnold
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "config.h"
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.section .icode,"ax",@progbits
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#define FULLSPEED /* use burst writing for word aligned destinations */
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.align 2
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.global memcpy
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.global __memcpy_fwd_entry
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.type memcpy,@function
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/* Copies <length> bytes of data in memory from <source> to <dest>
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* This version is optimized for speed
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*
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* arguments:
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* (4,%sp) - destination address
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* (8,%sp) - source address
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* (12,%sp) - length
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*
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* return value:
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* %d0 - destination address (like ANSI version)
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*
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* register usage:
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* %a0 - current source address
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* %a1 - current dest address
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* %a2 - source end address (in line-copy loops)
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* %d0 - data / scratch
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* %d1 - source end address (byte and longword copy) / data / scratch
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* %d2 - data / scratch
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* %d3..%d7 - data
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*
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* For maximum speed this routine reads and writes whole lines using burst
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* move (movem.l) where possible. For byte aligned destinations (long+1 and
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* long+3) it writes longwords only. Same goes for word aligned destinations
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* if FULLSPEED is undefined.
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*/
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memcpy:
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move.l (4,%sp),%a1 /* Destination */
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move.l (8,%sp),%a0 /* Source */
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move.l (12,%sp),%d1 /* Length */
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__memcpy_fwd_entry:
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add.l %a0,%d1 /* %d1 = source end */
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move.l %a0,%d0
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addq.l #7,%d0
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and.l #0xFFFFFFFC,%d0 /* %d0 = first source long bound + 4 */
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cmp.l %d0,%d1 /* at least one aligned longword to copy? */
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blo.w .bytes2_start /* no, jump directly to trailing byte loop */
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subq.l #4,%d0 /* %d0 = first source long bound */
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cmp.l %a0,%d0 /* any bytes to copy? */
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jls .bytes1_end /* no: skip byte loop */
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/* leading byte loop: copies 0..3 bytes */
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.bytes1_loop:
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move.b (%a0)+,(%a1)+ /* copy byte */
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cmp.l %a0,%d0 /* runs %a0 up to first long bound */
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jhi .bytes1_loop
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.bytes1_end:
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moveq.l #31,%d0
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add.l %a0,%d0
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and.l #0xFFFFFFF0,%d0 /* %d0 = first source line bound + 16 */
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cmp.l %d0,%d1 /* at least one aligned line to copy? */
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blo.w .long_start /* no: jump to longword copy loop */
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lea.l (-28,%sp),%sp /* free up some registers */
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movem.l %d2-%d7/%a2,(%sp)
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moveq.l #16,%d2
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sub.l %d2,%d0 /* %d0 = first source line bound */
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move.l %d1,%a2 /* %a2 = end address */
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lea.l (-15,%a2),%a2 /* adjust end address for loops doing 16 bytes/ pass */
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move.l %a1,%d1
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moveq.l #3,%d2 /* mask */
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and.l %d2,%d1
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jmp.l (2,%pc,%d1.l*4) /* switch (dest_addr & 3) */
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bra.w .lines_do0_start
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bra.w .lines_do1_start
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bra.w .lines_do2_start
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/* bra.w .lines_do3_start implicit */
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/* byte aligned destination (long + 3): use line burst reads in main loop */
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.lines_do3_start:
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moveq.l #24,%d1 /* shift count for shifting by 3 bytes */
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cmp.l %a0,%d0 /* any leading longwords? */
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jhi .lines_do3_head_start /* yes: leading longword copy */
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movem.l (%a0),%d4-%d7 /* load first line */
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lea.l (16,%a0),%a0
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move.l %d4,%d2
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lsr.l %d1,%d2 /* get high byte of first longword */
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move.b %d2,(%a1)+ /* store byte */
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jra .lines_do3_entry /* jump into main loop */
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.lines_do3_head_start:
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move.l (%a0)+,%d7 /* load first longword */
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move.l %d7,%d2
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lsr.l %d1,%d2 /* get high byte */
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move.b %d2,(%a1)+ /* store byte */
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jra .lines_do3_head_entry /* jump into leading longword loop */
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.lines_do3_head_loop:
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move.l %d7,%d6 /* move old longword away */
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move.l (%a0)+,%d7 /* load new longword */
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move.l %d7,%d2
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lsr.l %d1,%d2 /* get high byte */
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or.l %d2,%d6 /* combine with old lower 3 bytes */
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move.l %d6,(%a1)+ /* store longword */
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.lines_do3_head_entry:
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lsl.l #8,%d7 /* shift up lower 3 bytes */
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cmp.l %a0,%d0 /* runs %a0 up to first line bound */
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jhi .lines_do3_head_loop
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.lines_do3_loop:
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move.l %d7,%d3 /* move last longword of old line away */
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movem.l (%a0),%d4-%d7 /* load new line */
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lea.l (16,%a0),%a0
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move.l %d4,%d2
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lsr.l %d1,%d2 /* get high byte of 1st longword */
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or.l %d2,%d3 /* combine with old lower 3 bytes */
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move.l %d3,(%a1)+ /* store longword */
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.lines_do3_entry:
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lsl.l #8,%d4 /* shift up lower 3 bytes */
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move.l %d5,%d2
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lsr.l %d1,%d2 /* get high byte of 2nd longword */
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or.l %d2,%d4 /* combine with 1st lower 3 bytes */
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move.l %d4,(%a1)+ /* store longword */
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lsl.l #8,%d5 /* shift up lower 3 bytes */
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move.l %d6,%d2
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lsr.l %d1,%d2 /* get high byte of 3rd longword */
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or.l %d2,%d5 /* combine with 2nd lower 3 bytes */
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move.l %d5,(%a1)+ /* store longword */
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lsl.l #8,%d6 /* shift up lower 3 bytes */
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move.l %d7,%d2
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lsr.l %d1,%d2 /* get high byte of 4th longword */
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or.l %d2,%d6 /* combine with 3rd lower 3 bytes */
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move.l %d6,(%a1)+ /* store longword */
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lsl.l #8,%d7 /* shift up lower 3 bytes */
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cmp.l %a0,%a2 /* runs %a0 up to last line bound */
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jhi .lines_do3_loop
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lea.l (12,%a2),%a2 /* readjust end address for doing longwords */
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cmp.l %a0,%a2 /* any trailing longwords? */
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jls .lines_do3_tail_end /* no: just store last lower 3 bytes */
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.lines_do3_tail_loop:
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move.l %d7,%d6 /* move old longword away */
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move.l (%a0)+,%d7 /* load new longword */
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move.l %d7,%d2
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lsr.l %d1,%d2 /* get high byte */
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or.l %d2,%d6 /* combine with old lower 3 bytes */
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move.l %d6,(%a1)+ /* store longword */
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lsl.l #8,%d7 /* shift up lower 3 bytes */
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cmp.l %a0,%a2 /* runs %a0 up to last long bound */
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jhi .lines_do3_tail_loop
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.lines_do3_tail_end:
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swap %d7 /* get high word */
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move.w %d7,(%a1)+ /* store word */
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lsr.l %d1,%d7 /* get moved-up low byte */
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move.b %d7,(%a1)+ /* store byte */
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jra .lines_end
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/* byte aligned destination (long + 1): use line burst reads in main loop */
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.lines_do1_start:
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moveq.l #24,%d1 /* shift count for shifting by 3 bytes */
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cmp.l %a0,%d0 /* any leading longwords? */
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jhi .lines_do1_head_start /* yes: leading longword copy */
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movem.l (%a0),%d4-%d7 /* load first line */
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lea.l (16,%a0),%a0
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move.l %d4,%d2 /* first longword, bytes 3210 */
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lsr.l #8,%d2 /* first longword, bytes .321 */
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swap %d2 /* first longword, bytes 21.3 */
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move.b %d2,(%a1)+ /* store byte */
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swap %d2 /* first longword, bytes .321 */
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move.w %d2,(%a1)+ /* store word */
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jra .lines_do1_entry
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.lines_do1_head_start:
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move.l (%a0)+,%d7 /* load first longword */
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move.l %d7,%d2 /* first longword, bytes 3210 */
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lsr.l #8,%d2 /* first longword, bytes .321 */
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swap %d2 /* first longword, bytes 21.3 */
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move.b %d2,(%a1)+ /* store byte */
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swap %d2 /* first longword, bytes .321 */
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move.w %d2,(%a1)+ /* store word */
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jra .lines_do1_head_entry
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.lines_do1_head_loop:
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move.l %d7,%d6 /* move old longword away */
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move.l (%a0)+,%d7 /* load new longword */
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move.l %d7,%d2
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lsr.l #8,%d2 /* get upper 3 bytes */
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or.l %d2,%d6 /* combine with old low byte */
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move.l %d6,(%a1)+ /* store longword */
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.lines_do1_head_entry:
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lsl.l %d1,%d7 /* shift up low byte */
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cmp.l %a0,%d0 /* runs %a0 up to first line bound */
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jhi .lines_do1_head_loop
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.lines_do1_loop:
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move.l %d7,%d3 /* move last longword of old line away */
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movem.l (%a0),%d4-%d7 /* load new line */
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lea.l (16,%a0),%a0
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move.l %d4,%d2
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lsr.l #8,%d2 /* get upper 3 bytes of 1st longword */
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or.l %d2,%d3 /* combine with low byte of old longword */
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move.l %d3,(%a1)+ /* store longword */
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.lines_do1_entry:
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lsl.l %d1,%d4 /* shift up low byte */
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move.l %d5,%d2
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lsr.l #8,%d2 /* get upper 3 bytes of 2nd longword */
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or.l %d2,%d4 /* combine with low byte of 1st longword */
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move.l %d4,(%a1)+ /* store longword */
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lsl.l %d1,%d5 /* shift up low byte */
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move.l %d6,%d2
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lsr.l #8,%d2 /* get upper 3 bytes of 3rd longword */
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or.l %d2,%d5 /* combine with low byte of 2nd longword */
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move.l %d5,(%a1)+ /* store longword */
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lsl.l %d1,%d6 /* shift up low byte */
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move.l %d7,%d2
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lsr.l #8,%d2 /* get upper 3 bytes of 4th longword */
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or.l %d2,%d6 /* combine with low byte of 4th longword */
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move.l %d6,(%a1)+ /* store longword */
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lsl.l %d1,%d7 /* shift up low byte */
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cmp.l %a0,%a2 /* runs %a0 up to last line bound */
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jhi .lines_do1_loop
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lea.l (12,%a2),%a2 /* readjust end address for doing longwords */
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cmp.l %a0,%a2 /* any trailing longwords? */
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jls .lines_do1_tail_end /* no: just store last low byte */
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.lines_do1_tail_loop:
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move.l %d7,%d6 /* move old longword away */
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move.l (%a0)+,%d7 /* load new longword */
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move.l %d7,%d2
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lsr.l #8,%d2 /* get upper 3 bytes */
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or.l %d2,%d6 /* combine with old low byte */
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move.l %d6,(%a1)+ /* store longword */
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lsl.l %d1,%d7 /* shift up low byte */
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cmp.l %a0,%a2 /* runs %a0 up to last long bound */
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jhi .lines_do1_tail_loop
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.lines_do1_tail_end:
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lsr.l %d1,%d7 /* get shifted-up low byte */
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move.b %d7,(%a1)+ /* store byte */
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jra .lines_end
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/* long aligned destination (line + 0/4/8/12): head */
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.lines_do0_head_loop:
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move.l (%a0)+,(%a1)+ /* copy longword */
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.lines_do0_start:
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cmp.l %a0,%d0 /* runs %a0 up to first line bound */
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jhi .lines_do0_head_loop
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.lines_do0_head_end:
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move.l %a1,%d1
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lsr.l #2,%d1
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moveq.l #3,%d0 /* mask */
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and.l %d0,%d1
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moveq.l #16,%d0 /* address increment for one main loop pass */
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jmp.l (2,%pc,%d1.l*2) /* switch ((dest_addr >> 2) & 3) */
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bra.b .lines_lo0_start
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bra.b .lines_lo4_start
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bra.b .lines_lo8_start
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/* bra.b .lines_lo12_start implicit */
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/* long aligned destination (line + 12): use line bursts in the loop */
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.lines_lo12_start:
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movem.l (%a0),%d4-%d7 /* load first line */
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add.l %d0,%a0
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move.l %d4,(%a1)+ /* store 1st longword */
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cmp.l %a0,%a2 /* any full lines? */
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jls .lines_lo12_end /* no: skip main loop */
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.lines_lo12_loop:
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move.l %d5,%d1 /* move last 3 longwords of old line away */
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move.l %d6,%d2
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move.l %d7,%d3
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movem.l (%a0),%d4-%d7 /* load new line */
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add.l %d0,%a0
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movem.l %d1-%d4,(%a1) /* store line (3 old + 1 new longwords) */
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add.l %d0,%a1
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cmp.l %a0,%a2 /* runs %a0 up to last line bound */
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jhi .lines_lo12_loop
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/* long aligned destination (line + 0/4/8/12): tail */
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.lines_lo12_end:
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move.l %d5,(%a1)+ /* store 3rd last longword */
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.lines_lo8_end:
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move.l %d6,(%a1)+ /* store 2nd last longword */
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.lines_lo4_end:
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move.l %d7,(%a1)+ /* store last longword */
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.lines_lo0_end:
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lea.l (12,%a2),%a2 /* readjust end address for doing longwords */
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cmp.l %a0,%a2 /* any trailing longwords? */
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jls .lines_end /* no: get outta here */
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.lines_do0_tail_loop:
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move.l (%a0)+,(%a1)+ /* copy longword */
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cmp.l %a0,%a2 /* runs %a0 up to last long bound */
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jhi .lines_do0_tail_loop
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jra .lines_end
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/* line aligned destination: use line bursts in the loop */
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.lines_lo0_start:
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.lines_lo0_loop:
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movem.l (%a0),%d4-%d7 /* load line */
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add.l %d0,%a0
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movem.l %d4-%d7,(%a1) /* store line */
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add.l %d0,%a1
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cmp.l %a0,%a2 /* runs %a0 up to last line bound */
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jhi .lines_lo0_loop
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jra .lines_lo0_end /* handle trailing longwords */
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/* long aligned destination (line + 4): use line bursts in the loop */
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.lines_lo4_start:
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movem.l (%a0),%d4-%d7 /* load first line */
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add.l %d0,%a0
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move.l %d4,(%a1)+ /* store 1st longword */
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move.l %d5,(%a1)+ /* store 2nd longword */
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move.l %d6,(%a1)+ /* store 3rd longword */
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cmp.l %a0,%a2 /* any full lines? */
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jls .lines_lo4_end /* no: skip main loop */
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.lines_lo4_loop:
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move.l %d7,%d3 /* move last longword of old line away */
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movem.l (%a0),%d4-%d7 /* load new line */
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add.l %d0,%a0
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movem.l %d3-%d6,(%a1) /* store line (1 old + 3 new longwords) */
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add.l %d0,%a1
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cmp.l %a0,%a2 /* runs %a0 up to last line bound */
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jhi .lines_lo4_loop
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jra .lines_lo4_end /* handle trailing longwords */
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/* long aligned destination (line + 8): use line bursts in the loop */
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.lines_lo8_start:
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movem.l (%a0),%d4-%d7 /* load first line */
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add.l %d0,%a0
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move.l %d4,(%a1)+ /* store 1st longword */
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move.l %d5,(%a1)+ /* store 2nd longword */
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cmp.l %a0,%a2
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jls .lines_lo8_end
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.lines_lo8_loop:
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move.l %d6,%d2 /* move last 2 longwords of old line away */
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move.l %d7,%d3
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movem.l (%a0),%d4-%d7 /* load new line */
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add.l %d0,%a0
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movem.l %d2-%d5,(%a1) /* store line (2 old + 2 new longwords) */
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add.l %d0,%a1
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cmp.l %a0,%a2 /* runs %a0 up to last line bound */
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jhi .lines_lo8_loop
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jra .lines_lo8_end /* handle trailing longwords */
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#ifdef FULLSPEED
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/* word aligned destination (line + 2/6/10/14): head */
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.lines_do2_start:
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cmp.l %a0,%d0 /* any leading longwords? */
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jls .lines_do2_selector /* no: jump to mainloop selector */
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move.l (%a0)+,%d7 /* load first longword */
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swap %d7 /* swap words */
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move.w %d7,(%a1)+ /* store high word */
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cmp.l %a0,%d0 /* any more longword? */
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jls .lines_do2_head_end /* no: skip head loop */
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.lines_do2_head_loop:
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move.l %d7,%d6 /* move old longword away */
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move.l (%a0)+,%d7 /* load new longword */
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swap %d7 /* swap words */
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move.w %d7,%d6 /* combine high word with old low word */
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move.l %d6,(%a1)+ /* store longword */
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cmp.l %a0,%d0 /* runs %a0 up to first line bound */
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jhi .lines_do2_head_loop
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.lines_do2_head_end:
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swap %d7 /* undo swap */
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move.w %d7,(%a1)+ /* store word */
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.lines_do2_selector:
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move.l %a1,%d1
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lsr.l #2,%d1
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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
|