d036e97d38
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8601 a1c6a512-1295-4272-9138-f99709370657
869 lines
34 KiB
ArmAsm
Executable file
869 lines
34 KiB
ArmAsm
Executable file
/***************************************************************************
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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) 2006 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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#if CONFIG_CPU == SH7034
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.align 2
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.global _memmove
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.type _memmove,@function
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/* Moves <length> bytes of data in memory from <source> to <dest>
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* Regions may overlap.
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* This version is optimized for speed, and needs the corresponding memcpy
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* implementation for the forward copy branch.
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*
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* arguments:
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* r4 - destination address
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* r5 - source address
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* r6 - length
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*
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* return value:
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* r0 - destination address (like ANSI version)
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*
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* register usage:
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* r0 - data / scratch
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* r1 - 2nd data / scratch
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* r2 - scratch
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* r3 - last long bound / adjusted start address (only if >= 11 bytes)
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* r4 - current dest address
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* r5 - source start address
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* r6 - current source address
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*
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* The instruction order is devised in a way to utilize the pipelining
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* of the SH1 to the max. The routine also tries to utilize fast page mode.
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*/
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_memmove:
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cmp/hi r4,r5 /* source > destination */
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bf .backward /* no: backward copy */
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mov.l .memcpy_fwd,r0
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jmp @r0
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mov r4,r7 /* store dest for returning */
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.align 2
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.memcpy_fwd:
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.long ___memcpy_fwd_entry
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.backward:
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add r6,r4 /* r4 = destination end */
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mov #11,r0
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cmp/hs r0,r6 /* at least 11 bytes to copy? (ensures 2 aligned longs) */
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add #-8,r5 /* adjust for late decrement (max. 2 longs) */
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add r5,r6 /* r6 = source end - 8 */
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bf .start_b2r /* no: jump directly to byte loop */
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mov #-4,r3 /* r3 = 0xfffffffc */
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and r6,r3 /* r3 = last source long bound */
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cmp/hi r3,r6 /* already aligned? */
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bf .end_b1r /* yes: skip leading byte loop */
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.loop_b1r:
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mov.b @(7,r6),r0 /* load byte */
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add #-1,r6 /* decrement source addr */
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mov.b r0,@-r4 /* store byte */
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cmp/hi r3,r6 /* runs r6 down to last long bound */
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bt .loop_b1r
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.end_b1r:
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mov #3,r1
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and r4,r1 /* r1 = dest alignment offset */
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mova .jmptab_r,r0
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mov.b @(r0,r1),r1 /* select appropriate main loop.. */
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add r0,r1
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mov r5,r3 /* copy start adress to r3 */
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jmp @r1 /* ..and jump to it */
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add #7,r3 /* adjust end addr for main loops doing 2 longs/pass */
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/** main loops, copying 2 longs per pass to profit from fast page mode **/
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/* long aligned destination (fastest) */
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.align 2
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.loop_do0r:
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mov.l @r6,r1 /* load first long */
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add #-8,r6 /* decrement source addr */
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mov.l @(12,r6),r0 /* load second long */
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cmp/hi r3,r6 /* runs r6 down to first or second long bound */
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mov.l r0,@-r4 /* store second long */
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mov.l r1,@-r4 /* store first long; NOT ALIGNED - no speed loss here! */
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bt .loop_do0r
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add #-4,r3 /* readjust end address */
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cmp/hi r3,r6 /* first long left? */
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bf .start_b2r /* no, jump to trailing byte loop */
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mov.l @(4,r6),r0 /* load first long */
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add #-4,r6 /* decrement source addr */
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bra .start_b2r /* jump to trailing byte loop */
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mov.l r0,@-r4 /* store first long */
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/* word aligned destination (long + 2) */
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.align 2
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.loop_do2r:
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mov.l @r6,r1 /* load first long */
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add #-8,r6 /* decrement source addr */
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mov.l @(12,r6),r0 /* load second long */
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cmp/hi r3,r6 /* runs r6 down to first or second long bound */
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mov.w r0,@-r4 /* store low word of second long */
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xtrct r1,r0 /* extract low word of first long & high word of second long */
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mov.l r0,@-r4 /* and store as long */
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shlr16 r1 /* get high word of first long */
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mov.w r1,@-r4 /* and store it */
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bt .loop_do2r
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add #-4,r3 /* readjust end address */
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cmp/hi r3,r6 /* first long left? */
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bf .start_b2r /* no, jump to trailing byte loop */
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mov.l @(4,r6),r0 /* load first long & decrement source addr */
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add #-4,r6 /* decrement source addr */
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mov.w r0,@-r4 /* store low word */
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shlr16 r0 /* get high word */
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bra .start_b2r /* jump to trailing byte loop */
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mov.w r0,@-r4 /* and store it */
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/* jumptable for loop selector */
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.align 2
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.jmptab_r:
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.byte .loop_do0r - .jmptab_r /* placed in the middle because the SH1 */
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.byte .loop_do1r - .jmptab_r /* loads bytes sign-extended. Otherwise */
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.byte .loop_do2r - .jmptab_r /* the last loop would be out of reach */
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.byte .loop_do3r - .jmptab_r /* of the offset range. */
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/* byte aligned destination (long + 1) */
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.align 2
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.loop_do1r:
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mov.l @r6,r1 /* load first long */
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add #-8,r6 /* decrement source addr */
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mov.l @(12,r6),r0 /* load second long */
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cmp/hi r3,r6 /* runs r6 down to first or second long bound */
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mov.b r0,@-r4 /* store low byte of second long */
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shlr8 r0 /* get upper 3 bytes */
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mov r1,r2 /* copy first long */
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shll16 r2 /* move low byte of first long all the way up, .. */
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shll8 r2
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or r2,r0 /* ..combine with the 3 bytes of second long.. */
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mov.l r0,@-r4 /* ..and store as long */
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shlr8 r1 /* get middle 2 bytes */
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mov.w r1,@-r4 /* store as word */
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shlr16 r1 /* get upper byte */
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mov.b r1,@-r4 /* and store */
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bt .loop_do1r
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add #-4,r3 /* readjust end address */
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.last_do13r:
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cmp/hi r3,r6 /* first long left? */
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bf .start_b2r /* no, jump to trailing byte loop */
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nop /* alignment */
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mov.l @(4,r6),r0 /* load first long */
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add #-4,r6 /* decrement source addr */
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mov.b r0,@-r4 /* store low byte */
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shlr8 r0 /* get middle 2 bytes */
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mov.w r0,@-r4 /* store as word */
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shlr16 r0 /* get upper byte */
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bra .start_b2r /* jump to trailing byte loop */
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mov.b r0,@-r4 /* and store */
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/* byte aligned destination (long + 3) */
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.align 2
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.loop_do3r:
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mov.l @r6,r1 /* load first long */
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add #-8,r6 /* decrement source addr */
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mov.l @(12,r6),r0 /* load second long */
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mov r1,r2 /* copy first long */
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mov.b r0,@-r4 /* store low byte of second long */
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shlr8 r0 /* get middle 2 bytes */
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mov.w r0,@-r4 /* store as word */
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shlr16 r0 /* get upper byte */
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shll8 r2 /* move lower 3 bytes of first long one up.. */
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or r2,r0 /* ..combine with the 1 byte of second long.. */
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mov.l r0,@-r4 /* ..and store as long */
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shlr16 r1 /* get upper byte of first long */
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shlr8 r1
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cmp/hi r3,r6 /* runs r6 down to first or second long bound */
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mov.b r1,@-r4 /* ..and store */
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bt .loop_do3r
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bra .last_do13r /* handle first longword: reuse routine for (long + 1) */
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add #-4,r3 /* readjust end address */
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/* trailing byte loop: copies 0..3 bytes (or all for < 11 in total) */
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.align 2
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.loop_b2r:
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mov.b @(7,r6),r0 /* load byte */
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add #-1,r6 /* decrement source addr */
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mov.b r0,@-r4 /* store byte */
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.start_b2r:
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cmp/hi r5,r6 /* runs r6 down to start address */
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bt .loop_b2r
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rts
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mov r4,r0 /* return dest start address */
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.end:
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.size _memmove,.end-_memmove
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#elif defined(CPU_COLDFIRE)
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#define FULLSPEED /* use burst writing for word aligned destinations */
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.align 2
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.global memmove
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.type memmove,@function
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/* Moves <length> bytes of data in memory from <source> to <dest>
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* Regions may overlap.
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* This version is optimized for speed, and needs the corresponding memcpy
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* implementation for the forward copy branch.
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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 start address (in line-copy loops)
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* %d0 - source start address (byte and longword copy) / data / scratch
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* %d1 - 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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memmove:
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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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cmp.l %a0,%a1
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bhi.b .backward /* dest > src -> backward copy */
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jmp __memcpy_fwd_entry
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.backward:
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move.l %a0,%d0 /* %d0 = source start */
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add.l %d1,%a0 /* %a0 = source end */
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add.l %d1,%a1 /* %a1 = destination end */
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move.l %a0,%d1
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and.l #0xFFFFFFFC,%d1 /* %d1 = last source long bound */
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subq.l #4,%d1
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cmp.l %d0,%d1 /* at least one aligned longword to copy? */
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blo.w .bytes2r_start
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addq.l #4,%d1 /* %d1 = last source long bound */
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cmp.l %d1,%a0 /* any bytes to copy */
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jls .bytes1r_end /* no: skip byte loop */
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/* leading byte loop: copies 0..3 bytes */
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.bytes1r_loop:
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move.b -(%a0),-(%a1) /* copy byte */
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cmp.l %d1,%a0 /* runs %a0 down to last long bound */
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jhi .bytes1r_loop
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.bytes1r_end:
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moveq.l #-16,%d1
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add.l %a0,%d1
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and.l #0xFFFFFFF0,%d1 /* %d1 = last 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 .longr_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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add.l %d2,%d1 /* %d1 = last source line bound */
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move.l %d0,%a2 /* %a2 = start address */
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lea.l (15,%a2),%a2 /* adjust start address for loops doing 16 bytes/pass */
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move.l %a1,%d0
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moveq.l #3,%d2 /* mask */
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and.l %d2,%d0
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jmp.l (2,%pc,%d0.l*4) /* switch (dest_addr & 3) */
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bra.w .lines_do0r_start
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bra.w .lines_do1r_start
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bra.w .lines_do2r_start
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/* bra.w .lines_do3r_start implicit */
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/* byte aligned destination (long - 1): use line burst reads in main loop */
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.lines_do3r_start:
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moveq.l #24,%d0 /* shift count for shifting by 3 bytes */
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cmp.l %d1,%a0 /* any leading longwords? */
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jhi .lines_do3r_head_start /* yes: leading longword copy */
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lea.l (-16,%a0),%a0
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movem.l (%a0),%d3-%d6 /* load initial line */
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move.l %d6,%d2 /* last longword, bytes 3210 */
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move.b %d2,-(%a1) /* store byte */
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lsr.l #8,%d2 /* last longword, bytes .321 */
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move.w %d2,-(%a1) /* store word */
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jra .lines_do3r_entry
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.lines_do3r_head_start:
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move.l -(%a0),%d3 /* load initial longword */
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move.l %d3,%d2 /* bytes 3210 */
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move.b %d2,-(%a1) /* store byte */
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lsr.l #8,%d2 /* bytes .321 */
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move.w %d2,-(%a1) /* store word */
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jra .lines_do3r_head_entry
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.lines_do3r_head_loop:
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move.l %d3,%d4 /* move old longword away */
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move.l -(%a0),%d3 /* load new longword */
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move.l %d3,%d2
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lsl.l #8,%d2 /* get bytes 210. */
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or.l %d2,%d4 /* combine with old high byte */
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move.l %d4,-(%a1) /* store longword */
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.lines_do3r_head_entry:
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lsr.l %d0,%d3 /* shift down high byte */
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cmp.l %d1,%a0 /* run %a0 down to last line bound */
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jhi .lines_do3r_head_loop
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.lines_do3r_loop:
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move.l %d3,%d7 /* move first longword of last line away */
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lea.l (-16,%a0),%a0
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movem.l (%a0),%d3-%d6 /* load new line */
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move.l %d6,%d2
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lsl.l #8,%d2 /* get bytes 210. of 4th longword */
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or.l %d2,%d7 /* combine with high byte of old longword */
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move.l %d7,-(%a1) /* store longword */
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.lines_do3r_entry:
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lsr.l %d0,%d6 /* shift down high byte */
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move.l %d5,%d2
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lsl.l #8,%d2 /* get bytes 210. of 3rd longword */
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or.l %d2,%d6 /* combine with high byte of 4th longword */
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move.l %d6,-(%a1) /* store longword */
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lsr.l %d0,%d5 /* shift down high byte */
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move.l %d4,%d2
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lsl.l #8,%d2 /* get bytes 210. of 2nd longword */
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or.l %d2,%d5 /* combine with high byte or 3rd longword */
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move.l %d5,-(%a1) /* store longword */
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lsr.l %d0,%d4 /* shift down high byte */
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move.l %d3,%d2
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lsl.l #8,%d2 /* get bytes 210. of 1st longword */
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or.l %d2,%d4 /* combine with high byte of 2nd longword */
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move.l %d4,-(%a1) /* store longword */
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lsr.l %d0,%d3 /* shift down high byte */
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cmp.l %a2,%a0 /* run %a0 down to first line bound */
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jhi .lines_do3r_loop
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lea.l (-12,%a2),%a2 /* readjust start address for doing longwords */
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cmp.l %a2,%a0 /* any trailing longwords? */
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jls .lines_do3r_tail_end /* no: just store last high byte */
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.lines_do3r_tail_loop:
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move.l %d3,%d4 /* move old longword away */
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move.l -(%a0),%d3 /* load new longword */
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move.l %d3,%d2
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lsl.l #8,%d2 /* get bytes 210. */
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or.l %d2,%d4 /* combine with old high byte */
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move.l %d4,-(%a1) /* store longword */
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lsr.l %d0,%d3 /* shift down high byte */
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cmp.l %a2,%a0 /* run %a0 down to first long bound */
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jhi .lines_do3r_tail_loop
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.lines_do3r_tail_end:
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move.b %d3,-(%a1) /* store shifted-down high byte */
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jra .linesr_end
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/* byte aligned destination (long - 3): use line burst reads in main loop */
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.lines_do1r_start:
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moveq.l #24,%d0 /* shift count for shifting by 3 bytes */
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cmp.l %d1,%a0 /* any leading longwords? */
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jhi .lines_do1r_head_start /* yes: leading longword copy */
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lea.l (-16,%a0),%a0
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movem.l (%a0),%d3-%d6 /* load initial line */
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move.b %d6,-(%a1) /* store low byte of last longword */
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jra .lines_do1r_entry
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.lines_do1r_head_start:
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move.l -(%a0),%d3 /* load initial longword */
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move.b %d3,-(%a1) /* store low byte */
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jra .lines_do1r_head_entry
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.lines_do1r_head_loop:
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move.l %d3,%d4 /* move old longword away */
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move.l -(%a0),%d3 /* load new longword */
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move.l %d3,%d2
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lsl.l %d0,%d2 /* get low byte */
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or.l %d2,%d4 /* combine with old bytes .321 */
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move.l %d4,-(%a1) /* store longword */
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.lines_do1r_head_entry:
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lsr.l #8,%d3 /* get bytes .321 */
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cmp.l %d1,%a0 /* run %a0 down to last line bound */
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jhi .lines_do1r_head_loop
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.lines_do1r_loop:
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move.l %d3,%d7 /* move first longword of old line away */
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lea.l (-16,%a0),%a0
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movem.l (%a0),%d3-%d6 /* load new line */
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move.l %d6,%d2
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lsl.l %d0,%d2 /* get low byte of 4th longword */
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or.l %d2,%d7 /* combine with bytes .321 of old longword */
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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
|
|
#endif
|