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2008-01-08 Jeff Johnston <jjohnstn@redhat.com>

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* libc/machine/m68k/memcpy.S: Remove % from register references
        as this is already handled by m68kasm.h.
        * libc/machine/m68k/memset.S: Ditto.
This commit is contained in:
Jeff Johnston
2008-01-08 21:48:06 +00:00
parent 84a49ec5c4
commit ceb32a183c
3 changed files with 66 additions and 60 deletions
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6
newlib/ChangeLog
View File

@@ -1,3 +1,9 @@
2008-01-08 Jeff Johnston <jjohnstn@redhat.com>
* libc/machine/m68k/memcpy.S: Remove % from register references
as this is already handled by m68kasm.h.
* libc/machine/m68k/memset.S: Ditto.
2008-01-07 Jeff Johnston <jjohnstn@redhat.com>
* libc/machine/m68k/m68kasm.h: New file.

56
newlib/libc/machine/m68k/memcpy.S
View File

@@ -34,63 +34,63 @@
*/
SYM(memcpy):
move.l 4(%sp),%a0 | dest ptr
move.l 8(%sp),%a1 | src ptr
move.l 12(%sp),%d1 | len
cmp.l #8,%d1 | if fewer than 8 bytes to transfer,
move.l 4(sp),a0 | dest ptr
move.l 8(sp),a1 | src ptr
move.l 12(sp),d1 | len
cmp.l #8,d1 | if fewer than 8 bytes to transfer,
blo .Lresidue | do not optimise
/* align dest */
move.l %a0,%d0 | copy of dest
neg.l %d0
and.l #3,%d0 | look for the lower two only
move.l a0,d0 | copy of dest
neg.l d0
and.l #3,d0 | look for the lower two only
beq 2f | is aligned?
sub.l %d0,%d1
lsr.l #1,%d0 | word align needed?
sub.l d0,d1
lsr.l #1,d0 | word align needed?
bcc 1f
move.b (%a1)+,(%a0)+
move.b (a1)+,(a0)+
1:
lsr.l #1,%d0 | long align needed?
lsr.l #1,d0 | long align needed?
bcc 2f
move.w (%a1)+,(%a0)+
move.w (a1)+,(a0)+
2:
/* long word transfers */
move.l %d1,%d0
and.l #3,%d1 | byte residue
lsr.l #3,%d0
move.l d1,d0
and.l #3,d1 | byte residue
lsr.l #3,d0
bcc 1f | carry set for 4-byte residue
move.l (%a1)+,(%a0)+
move.l (a1)+,(a0)+
1:
lsr.l #1,%d0 | number of 16-byte transfers
lsr.l #1,d0 | number of 16-byte transfers
bcc .Lcopy | carry set for 8-byte residue
bra .Lcopy8
1:
move.l (%a1)+,(%a0)+
move.l (%a1)+,(%a0)+
move.l (a1)+,(a0)+
move.l (a1)+,(a0)+
.Lcopy8:
move.l (%a1)+,(%a0)+
move.l (%a1)+,(%a0)+
move.l (a1)+,(a0)+
move.l (a1)+,(a0)+
.Lcopy:
#if !defined (__mcoldfire__)
dbra %d0,1b
sub.l #0x10000,%d0
dbra d0,1b
sub.l #0x10000,d0
#else
subq.l #1,%d0
subq.l #1,d0
#endif
bpl 1b
bra .Lresidue
1:
move.b (%a1)+,(%a0)+ | move residue bytes
move.b (a1)+,(a0)+ | move residue bytes
.Lresidue:
#if !defined (__mcoldfire__)
dbra %d1,1b | loop until done
dbra d1,1b | loop until done
#else
subq.l #1,%d1
subq.l #1,d1
bpl 1b
#endif
move.l 4(%sp),%d0 | return value
move.l 4(sp),d0 | return value
rts

64
newlib/libc/machine/m68k/memset.S
View File

@@ -41,60 +41,60 @@
| VG, April 2007
|
SYM(memset):
move.l 4(%sp),%a0 | dest ptr
move.l 8(%sp),%d0 | value
move.l 12(%sp),%d1 | len
cmp.l #16,%d1
move.l 4(sp),a0 | dest ptr
move.l 8(sp),d0 | value
move.l 12(sp),d1 | len
cmp.l #16,d1
blo .Lbset | below, byte fills
|
move.l %d2,-(%sp) | need a register
move.b %d0,%d2 | distribute low byte to all byte in word
lsl.l #8,%d0
move.b %d2,%d0
move.w %d0,%d2
swap %d0 | rotate 16
move.w %d2,%d0
move.l d2,-(sp) | need a register
move.b d0,d2 | distribute low byte to all byte in word
lsl.l #8,d0
move.b d2,d0
move.w d0,d2
swap d0 | rotate 16
move.w d2,d0
|
move.l %a0,%d2 | copy of src
neg.l %d2 | 1 2 3 ==> 3 2 1
and.l #3,%d2
move.l a0,d2 | copy of src
neg.l d2 | 1 2 3 ==> 3 2 1
and.l #3,d2
beq 2f | is aligned
|
sub.l %d2,%d1 | fix length
lsr.l #1,%d2 | word align needed?
sub.l d2,d1 | fix length
lsr.l #1,d2 | word align needed?
bcc 1f
move.b %d0,(%a0)+ | fill byte
move.b d0,(a0)+ | fill byte
1:
lsr.l #1,%d2 | long align needed?
lsr.l #1,d2 | long align needed?
bcc 2f
move.w %d0,(%a0)+ | fill word
move.w d0,(a0)+ | fill word
2:
move.l %d1,%d2 | number of long transfers (at least 3)
lsr.l #2,%d2
subq.l #1,%d2
move.l d1,d2 | number of long transfers (at least 3)
lsr.l #2,d2
subq.l #1,d2
1:
move.l %d0,(%a0)+ | fill long words
move.l d0,(a0)+ | fill long words
.Llset:
#if !defined (__mcoldfire__)
dbra %d2,1b | loop until done
sub.l #0x10000,%d2
dbra d2,1b | loop until done
sub.l #0x10000,d2
#else
subq.l #1,%d2
subq.l #1,d2
#endif
bpl 1b
and.l #3,%d1 | residue byte transfers, fixed
move.l (%sp)+,%d2 | restore d2
and.l #3,d1 | residue byte transfers, fixed
move.l (sp)+,d2 | restore d2
bra .Lbset
1:
move.b %d0,(%a0)+ | fill residue bytes
move.b d0,(a0)+ | fill residue bytes
.Lbset:
#if !defined (__mcoldfire__)
dbra %d1,1b | loop until done
dbra d1,1b | loop until done
#else
subq.l #1,%d1
subq.l #1,d1
bpl 1b
#endif
move.l 4(%sp),%d0 | return value
move.l 4(sp),d0 | return value
rts