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/* Copy SIZE bytes from SRC to DEST. For SUN4V Niagara.
Copyright (C) 2006, 2008 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by David S. Miller (davem@davemloft.net)
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sysdep.h>
#define ASI_BLK_INIT_QUAD_LDD_P 0xe2
#define ASI_P 0x80
#define ASI_PNF 0x82
#define LOAD(type,addr,dest) type##a [addr] ASI_P, dest
#define LOAD_TWIN(addr_reg,dest0,dest1) \
ldda [addr_reg] ASI_BLK_INIT_QUAD_LDD_P, dest0
#define STORE(type,src,addr) type src, [addr]
#define STORE_INIT(src,addr) stxa src, [addr] %asi
#ifndef XCC
#define USE_BPR
#define XCC xcc
#endif
#if !defined NOT_IN_libc
.register %g2,#scratch
.register %g3,#scratch
.register %g6,#scratch
.text
.align 32
ENTRY(__memcpy_niagara1)
# ifndef USE_BPR
srl %o2, 0, %o2
# endif
100: /* %o0=dst, %o1=src, %o2=len */
mov %o0, %g5
cmp %o2, 0
be,pn %XCC, 85f
218: or %o0, %o1, %o3
cmp %o2, 16
blu,a,pn %XCC, 80f
or %o3, %o2, %o3
/* 2 blocks (128 bytes) is the minimum we can do the block
* copy with. We need to ensure that we'll iterate at least
* once in the block copy loop. At worst we'll need to align
* the destination to a 64-byte boundary which can chew up
* to (64 - 1) bytes from the length before we perform the
* block copy loop.
*/
cmp %o2, (2 * 64)
blu,pt %XCC, 70f
andcc %o3, 0x7, %g0
/* %o0: dst
* %o1: src
* %o2: len (known to be >= 128)
*
* The block copy loops will use %o4/%o5,%g2/%g3 as
* temporaries while copying the data.
*/
LOAD(prefetch, %o1, #one_read)
wr %g0, ASI_BLK_INIT_QUAD_LDD_P, %asi
/* Align destination on 64-byte boundary. */
andcc %o0, (64 - 1), %o4
be,pt %XCC, 2f
sub %o4, 64, %o4
sub %g0, %o4, %o4 ! bytes to align dst
sub %o2, %o4, %o2
1: subcc %o4, 1, %o4
LOAD(ldub, %o1, %g1)
STORE(stb, %g1, %o0)
add %o1, 1, %o1
bne,pt %XCC, 1b
add %o0, 1, %o0
/* If the source is on a 16-byte boundary we can do
* the direct block copy loop. If it is 8-byte aligned
* we can do the 16-byte loads offset by -8 bytes and the
* init stores offset by one register.
*
* If the source is not even 8-byte aligned, we need to do
* shifting and masking (basically integer faligndata).
*
* The careful bit with init stores is that if we store
* to any part of the cache line we have to store the whole
* cacheline else we can end up with corrupt L2 cache line
* contents. Since the loop works on 64-bytes of 64-byte
* aligned store data at a time, this is easy to ensure.
*/
2:
andcc %o1, (16 - 1), %o4
andn %o2, (64 - 1), %g1 ! block copy loop iterator
sub %o2, %g1, %o2 ! final sub-block copy bytes
be,pt %XCC, 50f
cmp %o4, 8
be,a,pt %XCC, 10f
sub %o1, 0x8, %o1
/* Neither 8-byte nor 16-byte aligned, shift and mask. */
mov %g1, %o4
and %o1, 0x7, %g1
sll %g1, 3, %g1
mov 64, %o3
andn %o1, 0x7, %o1
LOAD(ldx, %o1, %g2)
sub %o3, %g1, %o3
sllx %g2, %g1, %g2
#define SWIVEL_ONE_DWORD(SRC, TMP1, TMP2, PRE_VAL, PRE_SHIFT, POST_SHIFT, DST)\
LOAD(ldx, SRC, TMP1); \
srlx TMP1, PRE_SHIFT, TMP2; \
or TMP2, PRE_VAL, TMP2; \
STORE_INIT(TMP2, DST); \
sllx TMP1, POST_SHIFT, PRE_VAL;
1: add %o1, 0x8, %o1
SWIVEL_ONE_DWORD(%o1, %g3, %o5, %g2, %o3, %g1, %o0 + 0x00)
add %o1, 0x8, %o1
SWIVEL_ONE_DWORD(%o1, %g3, %o5, %g2, %o3, %g1, %o0 + 0x08)
add %o1, 0x8, %o1
SWIVEL_ONE_DWORD(%o1, %g3, %o5, %g2, %o3, %g1, %o0 + 0x10)
add %o1, 0x8, %o1
SWIVEL_ONE_DWORD(%o1, %g3, %o5, %g2, %o3, %g1, %o0 + 0x18)
add %o1, 32, %o1
LOAD(prefetch, %o1, #one_read)
sub %o1, 32 - 8, %o1
SWIVEL_ONE_DWORD(%o1, %g3, %o5, %g2, %o3, %g1, %o0 + 0x20)
add %o1, 8, %o1
SWIVEL_ONE_DWORD(%o1, %g3, %o5, %g2, %o3, %g1, %o0 + 0x28)
add %o1, 8, %o1
SWIVEL_ONE_DWORD(%o1, %g3, %o5, %g2, %o3, %g1, %o0 + 0x30)
add %o1, 8, %o1
SWIVEL_ONE_DWORD(%o1, %g3, %o5, %g2, %o3, %g1, %o0 + 0x38)
subcc %o4, 64, %o4
bne,pt %XCC, 1b
add %o0, 64, %o0
#undef SWIVEL_ONE_DWORD
srl %g1, 3, %g1
ba,pt %XCC, 60f
add %o1, %g1, %o1
10: /* Destination is 64-byte aligned, source was only 8-byte
* aligned but it has been subtracted by 8 and we perform
* one twin load ahead, then add 8 back into source when
* we finish the loop.
*/
LOAD_TWIN(%o1, %o4, %o5)
1: add %o1, 16, %o1
LOAD_TWIN(%o1, %g2, %g3)
add %o1, 16 + 32, %o1
LOAD(prefetch, %o1, #one_read)
sub %o1, 32, %o1
STORE_INIT(%o5, %o0 + 0x00) ! initializes cache line
STORE_INIT(%g2, %o0 + 0x08)
LOAD_TWIN(%o1, %o4, %o5)
add %o1, 16, %o1
STORE_INIT(%g3, %o0 + 0x10)
STORE_INIT(%o4, %o0 + 0x18)
LOAD_TWIN(%o1, %g2, %g3)
add %o1, 16, %o1
STORE_INIT(%o5, %o0 + 0x20)
STORE_INIT(%g2, %o0 + 0x28)
LOAD_TWIN(%o1, %o4, %o5)
STORE_INIT(%g3, %o0 + 0x30)
STORE_INIT(%o4, %o0 + 0x38)
subcc %g1, 64, %g1
bne,pt %XCC, 1b
add %o0, 64, %o0
ba,pt %XCC, 60f
add %o1, 0x8, %o1
50: /* Destination is 64-byte aligned, and source is 16-byte
* aligned.
*/
1: LOAD_TWIN(%o1, %o4, %o5)
add %o1, 16, %o1
LOAD_TWIN(%o1, %g2, %g3)
add %o1, 16 + 32, %o1
LOAD(prefetch, %o1, #one_read)
sub %o1, 32, %o1
STORE_INIT(%o4, %o0 + 0x00) ! initializes cache line
STORE_INIT(%o5, %o0 + 0x08)
LOAD_TWIN(%o1, %o4, %o5)
add %o1, 16, %o1
STORE_INIT(%g2, %o0 + 0x10)
STORE_INIT(%g3, %o0 + 0x18)
LOAD_TWIN(%o1, %g2, %g3)
add %o1, 16, %o1
STORE_INIT(%o4, %o0 + 0x20)
STORE_INIT(%o5, %o0 + 0x28)
STORE_INIT(%g2, %o0 + 0x30)
STORE_INIT(%g3, %o0 + 0x38)
subcc %g1, 64, %g1
bne,pt %XCC, 1b
add %o0, 64, %o0
/* fall through */
60:
/* %o2 contains any final bytes still needed to be copied
* over. If anything is left, we copy it one byte at a time.
*/
wr %g0, ASI_PNF, %asi
brz,pt %o2, 85f
sub %o0, %o1, %o3
ba,a,pt %XCC, 90f
.align 64
70: /* 16 < len <= 64 */
bne,pn %XCC, 75f
sub %o0, %o1, %o3
72:
andn %o2, 0xf, %o4
and %o2, 0xf, %o2
1: subcc %o4, 0x10, %o4
LOAD(ldx, %o1, %o5)
add %o1, 0x08, %o1
LOAD(ldx, %o1, %g1)
sub %o1, 0x08, %o1
STORE(stx, %o5, %o1 + %o3)
add %o1, 0x8, %o1
STORE(stx, %g1, %o1 + %o3)
bgu,pt %XCC, 1b
add %o1, 0x8, %o1
73: andcc %o2, 0x8, %g0
be,pt %XCC, 1f
nop
sub %o2, 0x8, %o2
LOAD(ldx, %o1, %o5)
STORE(stx, %o5, %o1 + %o3)
add %o1, 0x8, %o1
1: andcc %o2, 0x4, %g0
be,pt %XCC, 1f
nop
sub %o2, 0x4, %o2
LOAD(lduw, %o1, %o5)
STORE(stw, %o5, %o1 + %o3)
add %o1, 0x4, %o1
1: cmp %o2, 0
be,pt %XCC, 85f
nop
ba,pt %XCC, 90f
nop
75:
andcc %o0, 0x7, %g1
sub %g1, 0x8, %g1
be,pn %icc, 2f
sub %g0, %g1, %g1
sub %o2, %g1, %o2
1: subcc %g1, 1, %g1
LOAD(ldub, %o1, %o5)
STORE(stb, %o5, %o1 + %o3)
bgu,pt %icc, 1b
add %o1, 1, %o1
2: add %o1, %o3, %o0
andcc %o1, 0x7, %g1
bne,pt %icc, 8f
sll %g1, 3, %g1
cmp %o2, 16
bgeu,pt %icc, 72b
nop
ba,a,pt %XCC, 73b
8: mov 64, %o3
andn %o1, 0x7, %o1
LOAD(ldx, %o1, %g2)
sub %o3, %g1, %o3
andn %o2, 0x7, %o4
sllx %g2, %g1, %g2
1: add %o1, 0x8, %o1
LOAD(ldx, %o1, %g3)
subcc %o4, 0x8, %o4
srlx %g3, %o3, %o5
or %o5, %g2, %o5
STORE(stx, %o5, %o0)
add %o0, 0x8, %o0
bgu,pt %icc, 1b
sllx %g3, %g1, %g2
srl %g1, 3, %g1
andcc %o2, 0x7, %o2
be,pn %icc, 85f
add %o1, %g1, %o1
ba,pt %XCC, 90f
sub %o0, %o1, %o3
.align 64
80: /* 0 < len <= 16 */
andcc %o3, 0x3, %g0
bne,pn %XCC, 90f
sub %o0, %o1, %o3
1:
subcc %o2, 4, %o2
LOAD(lduw, %o1, %g1)
STORE(stw, %g1, %o1 + %o3)
bgu,pt %XCC, 1b
add %o1, 4, %o1
85: retl
mov %g5, %o0
.align 32
90:
subcc %o2, 1, %o2
LOAD(ldub, %o1, %g1)
STORE(stb, %g1, %o1 + %o3)
bgu,pt %XCC, 90b
add %o1, 1, %o1
retl
mov %g5, %o0
END(__memcpy_niagara1)
#endif
|
