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Commit 25e5566e authored by David S. Miller's avatar David S. Miller
Browse files

[SPARC64]: Fix missing load-twin usage in Niagara-1 memcpy. 



For the case where the source is not aligned modulo 8
we don't use load-twins to suck the data in and this
kills performance since normal loads allocate in the
L1 cache (unlike load-twin) and thus big memcpys swipe
the entire L1 D-cache.

We need to allocate a register window to implement this
properly, but that actually simplifies a lot of things
as a nice side-effect.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 8cc8c28a

arch/sparc64/lib/NGcopy_from_user.S

+4 −4
Original line number Diff line number Diff line 
/* NGcopy_from_user.S: Niagara optimized copy from userspace.

 *

 * Copyright (C) 2006 David S. Miller (davem@davemloft.net)

 * Copyright (C) 2006, 2007 David S. Miller (davem@davemloft.net)

 */



#define EX_LD(x)		\
@@ -8,8 +8,8 @@ 
	.section .fixup;	\

	.align 4;		\

99:	wr	%g0, ASI_AIUS, %asi;\

	retl;			\

	 mov	1, %o0;		\

	ret;			\

	 restore %g0, 1, %o0;	\

	.section __ex_table,"a";\

	.align 4;		\

	.word 98b, 99b;		\
@@ -24,7 +24,7 @@ 
#define LOAD(type,addr,dest)	type##a [addr] ASI_AIUS, dest

#define LOAD_TWIN(addr_reg,dest0,dest1)	\

	ldda [addr_reg] ASI_BLK_INIT_QUAD_LDD_AIUS, dest0

#define EX_RETVAL(x)		0

#define EX_RETVAL(x)		%g0



#ifdef __KERNEL__

#define PREAMBLE					\

arch/sparc64/lib/NGcopy_to_user.S

+4 −4
Original line number Diff line number Diff line 
/* NGcopy_to_user.S: Niagara optimized copy to userspace.

 *

 * Copyright (C) 2006 David S. Miller (davem@davemloft.net)

 * Copyright (C) 2006, 2007 David S. Miller (davem@davemloft.net)

 */



#define EX_ST(x)		\
@@ -8,8 +8,8 @@ 
	.section .fixup;	\

	.align 4;		\

99:	wr	%g0, ASI_AIUS, %asi;\

	retl;			\

	 mov	1, %o0;		\

	ret;			\

	 restore %g0, 1, %o0;	\

	.section __ex_table,"a";\

	.align 4;		\

	.word 98b, 99b;		\
@@ -23,7 +23,7 @@ 
#define FUNC_NAME		NGcopy_to_user

#define STORE(type,src,addr)	type##a src, [addr] ASI_AIUS

#define STORE_ASI		ASI_BLK_INIT_QUAD_LDD_AIUS

#define EX_RETVAL(x)		0

#define EX_RETVAL(x)		%g0



#ifdef __KERNEL__

	/* Writing to %asi is _expensive_ so we hardcode it.

arch/sparc64/lib/NGmemcpy.S

+213 −158
Original line number Diff line number Diff line 
/* NGmemcpy.S: Niagara optimized memcpy.

 *

 * Copyright (C) 2006 David S. Miller (davem@davemloft.net)

 * Copyright (C) 2006, 2007 David S. Miller (davem@davemloft.net)

 */



#ifdef __KERNEL__
@@ -16,6 +16,12 @@ 
	wr	%g0, ASI_PNF, %asi

#endif



#ifdef __sparc_v9__

#define SAVE_AMOUNT	128

#else

#define SAVE_AMOUNT	64

#endif



#ifndef STORE_ASI

#define STORE_ASI	ASI_BLK_INIT_QUAD_LDD_P

#endif
@@ -50,7 +56,11 @@ 
#endif



#ifndef STORE_INIT

#ifndef SIMULATE_NIAGARA_ON_NON_NIAGARA

#define STORE_INIT(src,addr)	stxa src, [addr] %asi

#else

#define STORE_INIT(src,addr)	stx src, [addr + 0x00]

#endif

#endif



#ifndef FUNC_NAME
@@ -73,18 +83,19 @@ 


	.globl	FUNC_NAME

	.type	FUNC_NAME,#function

FUNC_NAME:	/* %o0=dst, %o1=src, %o2=len */

	srlx		%o2, 31, %g2

FUNC_NAME:	/* %i0=dst, %i1=src, %i2=len */

	PREAMBLE

	save		%sp, -SAVE_AMOUNT, %sp

	srlx		%i2, 31, %g2

	cmp		%g2, 0

	tne		%xcc, 5

	PREAMBLE

	mov		%o0, GLOBAL_SPARE

	cmp		%o2, 0

	mov		%i0, %o0

	cmp		%i2, 0

	be,pn		%XCC, 85f

	 or		%o0, %o1, %o3

	cmp		%o2, 16

	 or		%o0, %i1, %i3

	cmp		%i2, 16

	blu,a,pn	%XCC, 80f

	 or		%o3, %o2, %o3

	 or		%i3, %i2, %i3



	/* 2 blocks (128 bytes) is the minimum we can do the block

	 * copy with.  We need to ensure that we'll iterate at least
@@ -93,31 +104,31 @@ FUNC_NAME: /* %o0=dst, %o1=src, %o2=len */ 
	 * to (64 - 1) bytes from the length before we perform the

	 * block copy loop.

	 */

	cmp		%o2, (2 * 64)

	cmp		%i2, (2 * 64)

	blu,pt		%XCC, 70f

	 andcc		%o3, 0x7, %g0

	 andcc		%i3, 0x7, %g0



	/* %o0:	dst

	 * %o1:	src

	 * %o2:	len  (known to be >= 128)

	 * %i1:	src

	 * %i2:	len  (known to be >= 128)

	 *

	 * The block copy loops will use %o4/%o5,%g2/%g3 as

	 * The block copy loops will use %i4/%i5,%g2/%g3 as

	 * temporaries while copying the data.

	 */



	LOAD(prefetch, %o1, #one_read)

	LOAD(prefetch, %i1, #one_read)

	wr		%g0, STORE_ASI, %asi



	/* Align destination on 64-byte boundary.  */

	andcc		%o0, (64 - 1), %o4

	andcc		%o0, (64 - 1), %i4

	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

	EX_LD(LOAD(ldub, %o1, %g1))

	 sub		%i4, 64, %i4

	sub		%g0, %i4, %i4	! bytes to align dst

	sub		%i2, %i4, %i2

1:	subcc		%i4, 1, %i4

	EX_LD(LOAD(ldub, %i1, %g1))

	EX_ST(STORE(stb, %g1, %o0))

	add		%o1, 1, %o1

	add		%i1, 1, %i1

	bne,pt		%XCC, 1b

	add		%o0, 1, %o0
@@ -136,111 +147,155 @@ FUNC_NAME: /* %o0=dst, %o1=src, %o2=len */ 
	 * 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

	andcc		%i1, (16 - 1), %i4

	andn		%i2, (64 - 1), %g1	! block copy loop iterator

	be,pt		%XCC, 50f

	 cmp		%o4, 8

	be,a,pt		%XCC, 10f

	 sub		%o1, 0x8, %o1

	 sub		%i2, %g1, %i2		! final sub-block copy bytes



	cmp		%i4, 8

	be,pt		%XCC, 10f

	 sub		%i1, %i4, %i1



	/* 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

	EX_LD(LOAD(ldx, %o1, %g2))

	sub		%o3, %g1, %o3

	sllx		%g2, %g1, %g2

	and		%i4, 0x7, GLOBAL_SPARE

	sll		GLOBAL_SPARE, 3, GLOBAL_SPARE

	mov		64, %i5

	EX_LD(LOAD_TWIN(%i1, %g2, %g3))

	sub		%i5, GLOBAL_SPARE, %i5

	mov		16, %o4

	mov		32, %o5

	mov		48, %o7

	mov		64, %i3



	bg,pn	   	%XCC, 9f

	 nop



#define SWIVEL_ONE_DWORD(SRC, TMP1, TMP2, PRE_VAL, PRE_SHIFT, POST_SHIFT, DST)\

	EX_LD(LOAD(ldx, SRC, TMP1)); \

	srlx		TMP1, PRE_SHIFT, TMP2; \

	or		TMP2, PRE_VAL, TMP2; \

	EX_ST(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

#define MIX_THREE_WORDS(WORD1, WORD2, WORD3, PRE_SHIFT, POST_SHIFT, TMP) \

	sllx		WORD1, POST_SHIFT, WORD1; \

	srlx		WORD2, PRE_SHIFT, TMP; \

	sllx		WORD2, POST_SHIFT, WORD2; \

	or		WORD1, TMP, WORD1; \

	srlx		WORD3, PRE_SHIFT, TMP; \

	or		WORD2, TMP, WORD2;



8:	EX_LD(LOAD_TWIN(%i1 + %o4, %o2, %o3))

	MIX_THREE_WORDS(%g2, %g3, %o2, %i5, GLOBAL_SPARE, %o1)

	LOAD(prefetch, %i1 + %i3, #one_read)



	EX_ST(STORE_INIT(%g2, %o0 + 0x00))

	EX_ST(STORE_INIT(%g3, %o0 + 0x08))



	EX_LD(LOAD_TWIN(%i1 + %o5, %g2, %g3))

	MIX_THREE_WORDS(%o2, %o3, %g2, %i5, GLOBAL_SPARE, %o1)



	EX_ST(STORE_INIT(%o2, %o0 + 0x10))

	EX_ST(STORE_INIT(%o3, %o0 + 0x18))



	EX_LD(LOAD_TWIN(%i1 + %o7, %o2, %o3))

	MIX_THREE_WORDS(%g2, %g3, %o2, %i5, GLOBAL_SPARE, %o1)



	EX_ST(STORE_INIT(%g2, %o0 + 0x20))

	EX_ST(STORE_INIT(%g3, %o0 + 0x28))



	EX_LD(LOAD_TWIN(%i1 + %i3, %g2, %g3))

	add		%i1, 64, %i1

	MIX_THREE_WORDS(%o2, %o3, %g2, %i5, GLOBAL_SPARE, %o1)



	EX_ST(STORE_INIT(%o2, %o0 + 0x30))

	EX_ST(STORE_INIT(%o3, %o0 + 0x38))



	subcc		%g1, 64, %g1

	bne,pt		%XCC, 8b

	 add		%o0, 64, %o0



#undef SWIVEL_ONE_DWORD

	ba,pt		%XCC, 60f

	 add		%i1, %i4, %i1



9:	EX_LD(LOAD_TWIN(%i1 + %o4, %o2, %o3))

	MIX_THREE_WORDS(%g3, %o2, %o3, %i5, GLOBAL_SPARE, %o1)

	LOAD(prefetch, %i1 + %i3, #one_read)



	EX_ST(STORE_INIT(%g3, %o0 + 0x00))

	EX_ST(STORE_INIT(%o2, %o0 + 0x08))



	EX_LD(LOAD_TWIN(%i1 + %o5, %g2, %g3))

	MIX_THREE_WORDS(%o3, %g2, %g3, %i5, GLOBAL_SPARE, %o1)



	EX_ST(STORE_INIT(%o3, %o0 + 0x10))

	EX_ST(STORE_INIT(%g2, %o0 + 0x18))



	EX_LD(LOAD_TWIN(%i1 + %o7, %o2, %o3))

	MIX_THREE_WORDS(%g3, %o2, %o3, %i5, GLOBAL_SPARE, %o1)



	EX_ST(STORE_INIT(%g3, %o0 + 0x20))

	EX_ST(STORE_INIT(%o2, %o0 + 0x28))



	EX_LD(LOAD_TWIN(%i1 + %i3, %g2, %g3))

	add		%i1, 64, %i1

	MIX_THREE_WORDS(%o3, %g2, %g3, %i5, GLOBAL_SPARE, %o1)



	EX_ST(STORE_INIT(%o3, %o0 + 0x30))

	EX_ST(STORE_INIT(%g2, %o0 + 0x38))



	subcc		%g1, 64, %g1

	bne,pt		%XCC, 9b

	 add		%o0, 64, %o0



	srl		%g1, 3, %g1

	ba,pt		%XCC, 60f

	 add		%o1, %g1, %o1

	 add		%i1, %i4, %i1



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.

	 */

	EX_LD(LOAD_TWIN(%o1, %o4, %o5))

1:	add		%o1, 16, %o1

	EX_LD(LOAD_TWIN(%o1, %g2, %g3))

	add		%o1, 16 + 32, %o1

	LOAD(prefetch, %o1, #one_read)

	sub		%o1, 32, %o1

	EX_LD(LOAD_TWIN(%i1, %o4, %o5))

	mov	16, %o7

	mov	32, %g2

	mov	48, %g3

	mov	64, %o1

1:	EX_LD(LOAD_TWIN(%i1 + %o7, %o2, %o3))

	LOAD(prefetch, %i1 + %o1, #one_read)

	EX_ST(STORE_INIT(%o5, %o0 + 0x00))	! initializes cache line

	EX_ST(STORE_INIT(%g2, %o0 + 0x08))

	EX_LD(LOAD_TWIN(%o1, %o4, %o5))

	add		%o1, 16, %o1

	EX_ST(STORE_INIT(%g3, %o0 + 0x10))

	EX_ST(STORE_INIT(%o2, %o0 + 0x08))

	EX_LD(LOAD_TWIN(%i1 + %g2, %o4, %o5))

	EX_ST(STORE_INIT(%o3, %o0 + 0x10))

	EX_ST(STORE_INIT(%o4, %o0 + 0x18))

	EX_LD(LOAD_TWIN(%o1, %g2, %g3))

	add		%o1, 16, %o1

	EX_LD(LOAD_TWIN(%i1 + %g3, %o2, %o3))

	EX_ST(STORE_INIT(%o5, %o0 + 0x20))

	EX_ST(STORE_INIT(%g2, %o0 + 0x28))

	EX_LD(LOAD_TWIN(%o1, %o4, %o5))

	EX_ST(STORE_INIT(%g3, %o0 + 0x30))

	EX_ST(STORE_INIT(%o2, %o0 + 0x28))

	EX_LD(LOAD_TWIN(%i1 + %o1, %o4, %o5))

	add		%i1, 64, %i1

	EX_ST(STORE_INIT(%o3, %o0 + 0x30))

	EX_ST(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

	 add		%i1, 0x8, %i1



50:	/* Destination is 64-byte aligned, and source is 16-byte

	 * aligned.

	 */

1:	EX_LD(LOAD_TWIN(%o1, %o4, %o5))

	add	%o1, 16, %o1

	EX_LD(LOAD_TWIN(%o1, %g2, %g3))

	add	%o1, 16 + 32, %o1

	LOAD(prefetch, %o1, #one_read)

	sub	%o1, 32, %o1

	mov	16, %o7

	mov	32, %g2

	mov	48, %g3

	mov	64, %o1

1:	EX_LD(LOAD_TWIN(%i1 + %g0, %o4, %o5))

	EX_LD(LOAD_TWIN(%i1 + %o7, %o2, %o3))

	LOAD(prefetch, %i1 + %o1, #one_read)

	EX_ST(STORE_INIT(%o4, %o0 + 0x00))	! initializes cache line

	EX_ST(STORE_INIT(%o5, %o0 + 0x08))

	EX_LD(LOAD_TWIN(%o1, %o4, %o5))

	add	%o1, 16, %o1

	EX_ST(STORE_INIT(%g2, %o0 + 0x10))

	EX_ST(STORE_INIT(%g3, %o0 + 0x18))

	EX_LD(LOAD_TWIN(%o1, %g2, %g3))

	add	%o1, 16, %o1

	EX_LD(LOAD_TWIN(%i1 + %g2, %o4, %o5))

	EX_ST(STORE_INIT(%o2, %o0 + 0x10))

	EX_ST(STORE_INIT(%o3, %o0 + 0x18))

	EX_LD(LOAD_TWIN(%i1 + %g3, %o2, %o3))

	add	%i1, 64, %i1

	EX_ST(STORE_INIT(%o4, %o0 + 0x20))

	EX_ST(STORE_INIT(%o5, %o0 + 0x28))

	EX_ST(STORE_INIT(%g2, %o0 + 0x30))

	EX_ST(STORE_INIT(%g3, %o0 + 0x38))

	EX_ST(STORE_INIT(%o2, %o0 + 0x30))

	EX_ST(STORE_INIT(%o3, %o0 + 0x38))

	subcc	%g1, 64, %g1

	bne,pt	%XCC, 1b

	 add	%o0, 64, %o0
@@ -249,47 +304,47 @@ FUNC_NAME: /* %o0=dst, %o1=src, %o2=len */ 
60:	

	membar		#Sync



	/* %o2 contains any final bytes still needed to be copied

	/* %i2 contains any final bytes still needed to be copied

	 * over. If anything is left, we copy it one byte at a time.

	 */

	RESTORE_ASI(%o3)

	brz,pt		%o2, 85f

	 sub		%o0, %o1, %o3

	RESTORE_ASI(%i3)

	brz,pt		%i2, 85f

	 sub		%o0, %i1, %i3

	ba,a,pt		%XCC, 90f



	.align		64

70: /* 16 < len <= 64 */

	bne,pn		%XCC, 75f

	 sub		%o0, %o1, %o3

	 sub		%o0, %i1, %i3



72:

	andn		%o2, 0xf, %o4

	and		%o2, 0xf, %o2

1:	subcc		%o4, 0x10, %o4

	EX_LD(LOAD(ldx, %o1, %o5))

	add		%o1, 0x08, %o1

	EX_LD(LOAD(ldx, %o1, %g1))

	sub		%o1, 0x08, %o1

	EX_ST(STORE(stx, %o5, %o1 + %o3))

	add		%o1, 0x8, %o1

	EX_ST(STORE(stx, %g1, %o1 + %o3))

	andn		%i2, 0xf, %i4

	and		%i2, 0xf, %i2

1:	subcc		%i4, 0x10, %i4

	EX_LD(LOAD(ldx, %i1, %i5))

	add		%i1, 0x08, %i1

	EX_LD(LOAD(ldx, %i1, %g1))

	sub		%i1, 0x08, %i1

	EX_ST(STORE(stx, %i5, %i1 + %i3))

	add		%i1, 0x8, %i1

	EX_ST(STORE(stx, %g1, %i1 + %i3))

	bgu,pt		%XCC, 1b

	 add		%o1, 0x8, %o1

73:	andcc		%o2, 0x8, %g0

	 add		%i1, 0x8, %i1

73:	andcc		%i2, 0x8, %g0

	be,pt		%XCC, 1f

	 nop

	sub		%o2, 0x8, %o2

	EX_LD(LOAD(ldx, %o1, %o5))

	EX_ST(STORE(stx, %o5, %o1 + %o3))

	add		%o1, 0x8, %o1

1:	andcc		%o2, 0x4, %g0

	sub		%i2, 0x8, %i2

	EX_LD(LOAD(ldx, %i1, %i5))

	EX_ST(STORE(stx, %i5, %i1 + %i3))

	add		%i1, 0x8, %i1

1:	andcc		%i2, 0x4, %g0

	be,pt		%XCC, 1f

	 nop

	sub		%o2, 0x4, %o2

	EX_LD(LOAD(lduw, %o1, %o5))

	EX_ST(STORE(stw, %o5, %o1 + %o3))

	add		%o1, 0x4, %o1

1:	cmp		%o2, 0

	sub		%i2, 0x4, %i2

	EX_LD(LOAD(lduw, %i1, %i5))

	EX_ST(STORE(stw, %i5, %i1 + %i3))

	add		%i1, 0x4, %i1

1:	cmp		%i2, 0

	be,pt		%XCC, 85f

	 nop

	ba,pt		%xcc, 90f
@@ -300,71 +355,71 @@ FUNC_NAME: /* %o0=dst, %o1=src, %o2=len */ 
	sub		%g1, 0x8, %g1

	be,pn		%icc, 2f

	 sub		%g0, %g1, %g1

	sub		%o2, %g1, %o2

	sub		%i2, %g1, %i2



1:	subcc		%g1, 1, %g1

	EX_LD(LOAD(ldub, %o1, %o5))

	EX_ST(STORE(stb, %o5, %o1 + %o3))

	EX_LD(LOAD(ldub, %i1, %i5))

	EX_ST(STORE(stb, %i5, %i1 + %i3))

	bgu,pt		%icc, 1b

	 add		%o1, 1, %o1

	 add		%i1, 1, %i1



2:	add		%o1, %o3, %o0

	andcc		%o1, 0x7, %g1

2:	add		%i1, %i3, %o0

	andcc		%i1, 0x7, %g1

	bne,pt		%icc, 8f

	 sll		%g1, 3, %g1



	cmp		%o2, 16

	cmp		%i2, 16

	bgeu,pt		%icc, 72b

	 nop

	ba,a,pt		%xcc, 73b



8:	mov		64, %o3

	andn		%o1, 0x7, %o1

	EX_LD(LOAD(ldx, %o1, %g2))

	sub		%o3, %g1, %o3

	andn		%o2, 0x7, %o4

8:	mov		64, %i3

	andn		%i1, 0x7, %i1

	EX_LD(LOAD(ldx, %i1, %g2))

	sub		%i3, %g1, %i3

	andn		%i2, 0x7, %i4

	sllx		%g2, %g1, %g2

1:	add		%o1, 0x8, %o1

	EX_LD(LOAD(ldx, %o1, %g3))

	subcc		%o4, 0x8, %o4

	srlx		%g3, %o3, %o5

	or		%o5, %g2, %o5

	EX_ST(STORE(stx, %o5, %o0))

1:	add		%i1, 0x8, %i1

	EX_LD(LOAD(ldx, %i1, %g3))

	subcc		%i4, 0x8, %i4

	srlx		%g3, %i3, %i5

	or		%i5, %g2, %i5

	EX_ST(STORE(stx, %i5, %o0))

	add		%o0, 0x8, %o0

	bgu,pt		%icc, 1b

	 sllx		%g3, %g1, %g2



	srl		%g1, 3, %g1

	andcc		%o2, 0x7, %o2

	andcc		%i2, 0x7, %i2

	be,pn		%icc, 85f

	 add		%o1, %g1, %o1

	 add		%i1, %g1, %i1

	ba,pt		%xcc, 90f

	 sub		%o0, %o1, %o3

	 sub		%o0, %i1, %i3



	.align		64

80: /* 0 < len <= 16 */

	andcc		%o3, 0x3, %g0

	andcc		%i3, 0x3, %g0

	bne,pn		%XCC, 90f

	 sub		%o0, %o1, %o3

	 sub		%o0, %i1, %i3



1:

	subcc		%o2, 4, %o2

	EX_LD(LOAD(lduw, %o1, %g1))

	EX_ST(STORE(stw, %g1, %o1 + %o3))

	subcc		%i2, 4, %i2

	EX_LD(LOAD(lduw, %i1, %g1))

	EX_ST(STORE(stw, %g1, %i1 + %i3))

	bgu,pt		%XCC, 1b

	 add		%o1, 4, %o1

	 add		%i1, 4, %i1



85:	retl

	 mov		EX_RETVAL(GLOBAL_SPARE), %o0

85:	ret

	 restore	EX_RETVAL(%i0), %g0, %o0



	.align		32

90:

	subcc		%o2, 1, %o2

	EX_LD(LOAD(ldub, %o1, %g1))

	EX_ST(STORE(stb, %g1, %o1 + %o3))

	subcc		%i2, 1, %i2

	EX_LD(LOAD(ldub, %i1, %g1))

	EX_ST(STORE(stb, %g1, %i1 + %i3))

	bgu,pt		%XCC, 90b

	 add		%o1, 1, %o1

	retl

	 mov		EX_RETVAL(GLOBAL_SPARE), %o0

	 add		%i1, 1, %i1

	ret

	 restore	EX_RETVAL(%i0), %g0, %o0



	.size		FUNC_NAME, .-FUNC_NAME