alpha/lib/ev6-copy_user.S

21  *	E	- either cluster
49 	mov $18, $0		# .. .. .. E
50 	subq $18, 32, $1	# .. .. E. ..	: Is this going to be a small copy?
51 	nop			# .. E  .. ..
54 	and $16,7,$3		# .. .. .. E	: is leading dest misalignment
55 	ble $1, $onebyteloop	# .. .. U  ..	: 1st branch : small amount of data
57 	subq $3, 8, $3		# E  .. .. ..	: L U U L : trip counter
59  * The fetcher stall also hides the 1 cycle cross-cluster stall for $3 (L --> U)
64 	EXI( ldbu $1,0($17) )	# .. .. .. L	: Keep loads separate from stores
65 	addq $16,1,$16		# .. .. E  ..	: Section 3.8 in the CWG
66 	addq $3,1,$3		# .. E  .. ..	:
67 	nop			# E  .. .. ..	: U L U L
70  * the -1 is to compensate for the inc($16) done in a previous quadpack
73 	EXO( stb $1,-1($16) )	# .. .. .. L	:
74 	addq $17,1,$17		# .. .. E  ..	: Section 3.8 in the CWG
75 	subq $0,1,$0		# .. E  .. ..	:
83 	and $17,7,$1		# .. .. .. E	: Check _current_ source alignment
84 	bic $0,7,$4		# .. .. E  ..	: number bytes as a quadword loop
86 	beq $1,$quadaligned	# U  .. .. ..	: U L U L
96 	subq $4,8,$4		# .. .. E  ..	:
98 	extqh $2,$17,$1		# U  .. .. ..	: U U L L
100 	bis $3,$1,$1		# .. .. .. E	:
101 	EXO( stq $1,0($16) )	# .. .. L  ..	:
102 	addq $17,8,$17		# .. E  .. ..	:
103 	subq $0,8,$0		# E  .. .. ..	: U L L U
105 	addq $16,8,$16		# .. .. .. E	:
106 	bis $2,$2,$3		# .. .. E  ..	:
107 	nop			# .. E  .. ..	:
110 	nop			# .. .. .. E
111 	nop			# .. .. E  ..
112 	nop			# .. E  .. ..
117 	addq $16,1,$16		# .. .. E  ..	: as the store (Section 3.8 in CWG)
118 	nop			# .. E  .. ..	:
131 	subq	$4, 32, $2	# .. .. .. E	: do not unroll for small stuff
132 	nop			# .. .. E  ..
133 	nop			# .. E  .. ..
146 	EXI( ldq $1,0($17) )	# .. .. .. L
148 	subq	$4,32,$4	# .. E  .. ..
149 	nop			# E  .. .. ..	: U U L L
151 	addq	$17,16,$17	# .. .. .. E
152 	EXO( stq $1,0($16) )	# .. .. L  ..
154 	subq	$0,16,$0	# E  .. .. ..	: U L L U
156 	addq	$16,16,$16	# .. .. .. E
157 	EXI( ldq $1,0($17) )	# .. .. L  ..
159 	subq	$4, 32, $3	# E  .. .. ..	: U U L L : is there enough for another trip?
161 	EXO( stq $1,0($16) )	# .. .. .. L
163 	subq	$0,16,$0	# .. E  .. ..
164 	addq	$17,16,$17	# E  .. .. ..	: U L L U
166 	nop			# .. .. .. E
167 	nop			# .. .. E  ..
168 	addq	$16,16,$16	# .. E  .. ..
177 	EXI( ldq $1,0($17) )
182 	EXO( stq $1,0($16) )
204 	addq $16,1,$16		# .. .. E  ..	: as the store (Section 3.8 in CWG)
205 	nop			# .. E  .. ..	:
206 	nop			# E  .. .. ..	: U L U L
210  * the -1 is to compensate for the inc($16) done in a previous quadpack
213 	EXO ( stb $2,-1($16) )	# .. .. .. L	:
214 	addq $17,1,$17		# .. .. E  ..	: quadpack as the load
215 	subq $0,1,$0		# .. E  .. ..	: change count _after_ copy
221 	nop			# .. .. .. E
222 	nop			# .. .. E  ..
223 	nop			# .. E  .. ..
224 	ret $31,($26),1		# L0 .. .. ..	: L U L U