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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12845 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Michael Sevakis 2007-03-19 22:14:10 +00:00
parent 6114f59006
commit 600ca577dc
1 changed files with 6 additions and 6 deletions
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12
firmware/target/coldfire/memswap128-coldfire.S
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@ -27,23 +27,23 @@
memswap128:
lea.l -28(%sp), %sp | save registers
movem.l %d2-%d7/%a2, (%sp) |
movem.l 32(%sp), %a0-%a2 | %a0 = buf1
movem.l 32(%sp), %a0-%a2 | %a0 = buf1
| %a1 = buf2
| %a2 = len
lea.l -15(%a0, %a2.l), %a2 | %a2 = end address - 15
cmp.l %a0, %a2 | end address <= buf1?
bls.b .no_lines | not at least a line? leave
.loop: |
movem.l (%a0), %d0-%d3 | read four longwords from buf1
movem.l (%a1), %d4-%d7 | read four longwords from buf2
movem.l %d4-%d7, (%a0) | write buf2 data to buf1
movem.l %d0-%d3, (%a1) | write buf1 data to buf2
movem.l (%a0), %d0-%d3 | read four longwords from buf1
movem.l (%a1), %d4-%d7 | read four longwords from buf2
movem.l %d4-%d7, (%a0) | write buf2 data to buf1
movem.l %d0-%d3, (%a1) | write buf1 data to buf2
lea.l 16(%a0), %a0 | buf1 += 16
lea.l 16(%a1), %a1 | buf2 += 16
cmp.l %a0, %a2 | %a0 < %d0?
bhi.b .loop | yes? keep exchanging
.no_lines: |
movem.l (%sp), %d2-%d7/%a2 | restore registers
movem.l (%sp), %d2-%d7/%a2 | restore registers
lea.l 28(%sp), %sp |
rts |
.end: