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/* $Id: memscan.S,v 1.3 2000/01/31 04:59:10 davem Exp $
* memscan.S: Optimized memscan for Sparc64.
*
* Copyright (C) 1997,1998 Jakub Jelinek (jj@ultra.linux.cz)
* Copyright (C) 1998 David S. Miller (davem@redhat.com)
*/
#define HI_MAGIC 0x8080808080808080
#define LO_MAGIC 0x0101010101010101
#define ASI_PL 0x88
.text
.align 32
.globl __memscan_zero, __memscan_generic
.globl memscan
__memscan_zero:
/* %o0 = bufp, %o1 = size */
brlez,pn %o1, szzero
andcc %o0, 7, %g0
be,pt %icc, we_are_aligned
sethi %hi(HI_MAGIC), %o4
ldub [%o0], %o5
1: subcc %o1, 1, %o1
brz,pn %o5, 10f
add %o0, 1, %o0
be,pn %xcc, szzero
andcc %o0, 7, %g0
bne,a,pn %icc, 1b
ldub [%o0], %o5
we_are_aligned:
ldxa [%o0] ASI_PL, %o5
or %o4, %lo(HI_MAGIC), %o3
sllx %o3, 32, %o4
or %o4, %o3, %o3
srlx %o3, 7, %o2
msloop:
sub %o1, 8, %o1
add %o0, 8, %o0
sub %o5, %o2, %o4
xor %o4, %o5, %o4
andcc %o4, %o3, %g3
bne,pn %xcc, check_bytes
srlx %o4, 32, %g3
brgz,a,pt %o1, msloop
ldxa [%o0] ASI_PL, %o5
check_bytes:
bne,a,pn %icc, 2f
andcc %o5, 0xff, %g0
add %o0, -5, %g2
ba,pt %xcc, 3f
srlx %o5, 32, %g5
2: srlx %o5, 8, %g5
be,pn %icc, 1f
add %o0, -8, %g2
andcc %g5, 0xff, %g0
srlx %g5, 8, %g5
be,pn %icc, 1f
inc %g2
andcc %g5, 0xff, %g0
srlx %g5, 8, %g5
be,pn %icc, 1f
inc %g2
andcc %g5, 0xff, %g0
srlx %g5, 8, %g5
be,pn %icc, 1f
inc %g2
andcc %g3, %o3, %g0
be,a,pn %icc, 2f
mov %o0, %g2
3: andcc %g5, 0xff, %g0
srlx %g5, 8, %g5
be,pn %icc, 1f
inc %g2
andcc %g5, 0xff, %g0
srlx %g5, 8, %g5
be,pn %icc, 1f
inc %g2
andcc %g5, 0xff, %g0
srlx %g5, 8, %g5
be,pn %icc, 1f
inc %g2
andcc %g5, 0xff, %g0
srlx %g5, 8, %g5
be,pn %icc, 1f
inc %g2
2: brgz,a,pt %o1, msloop
ldxa [%o0] ASI_PL, %o5
inc %g2
1: add %o0, %o1, %o0
cmp %g2, %o0
retl
movle %xcc, %g2, %o0
10: retl
sub %o0, 1, %o0
szzero: retl
nop
memscan:
__memscan_generic:
/* %o0 = addr, %o1 = c, %o2 = size */
brz,pn %o2, 3f
add %o0, %o2, %o3
ldub [%o0], %o5
sub %g0, %o2, %o4
1:
cmp %o5, %o1
be,pn %icc, 2f
addcc %o4, 1, %o4
bne,a,pt %xcc, 1b
ldub [%o3 + %o4], %o5
retl
/* The delay slot is the same as the next insn, this is just to make it look more awful */
2:
add %o3, %o4, %o0
retl
sub %o0, 1, %o0
3:
retl
nop
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