alpha/lib/ev6-copy_user.S

23  *	L	- lower subcluster; L0 - subcluster L0; L1 - subcluster L1
50 	subq $18, 32, $1	# .. .. E. ..	: Is this going to be a small copy?
52 	beq $18, $zerolength	# U  .. .. ..	: U L U L
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  .. ..	:
76 	bne $3, $aligndest	# U  .. .. ..	: U L U L
83 	and $17,7,$1		# .. .. .. E	: Check _current_ source alignment
85 	EXI( ldq_u $3,0($17) )	# .. L  .. ..	: Forward fetch for fallthrough code
86 	beq $1,$quadaligned	# U  .. .. ..	: U L U L
95 	EXI( ldq_u $2,8($17) )	# .. .. .. L	:
98 	extqh $2,$17,$1		# U  .. .. ..	: U U L L
100 	bis $3,$1,$1		# .. .. .. E	:
101 	EXO( stq $1,0($16) )	# .. .. L  ..	:
103 	subq $0,8,$0		# E  .. .. ..	: U L L U
108 	bne $4,$misquad		# U  .. .. ..	: U L U L
113 	beq $0,$zerolength	# U  .. .. ..	: U L U L
116 	EXI ( ldbu $2,0($17) )	# .. .. .. L	: No loads in the same quad
117 	addq $16,1,$16		# .. .. E  ..	: as the store (Section 3.8 in CWG)
119 	br $31, $dirtyentry	# L0 .. .. ..	: L U U L
134 	blt	$2, $onequad	# U  .. .. ..	: U L U L
146 	EXI( ldq $1,0($17) )	# .. .. .. L
147 	EXI( ldq $2,8($17) )	# .. .. L  ..
149 	nop			# E  .. .. ..	: U U L L
152 	EXO( stq $1,0($16) )	# .. .. L  ..
153 	EXO( stq $2,8($16) )	# .. L  .. ..
154 	subq	$0,16,$0	# E  .. .. ..	: U L L U
157 	EXI( ldq $1,0($17) )	# .. .. L  ..
158 	EXI( ldq $2,8($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
162 	EXO( stq $2,8($16) )	# .. .. L  ..
164 	addq	$17,16,$17	# E  .. .. ..	: U L L U
169 	bgt	$3,$unroll4	# U  .. .. ..	: U L U L
177 	EXI( ldq $1,0($17) )
182 	EXO( stq $1,0($16) )
203 	EXI ( ldbu $2,0($17) )	# .. .. .. L	: No loads in the same quad
204 	addq $16,1,$16		# .. .. E  ..	: as the store (Section 3.8 in CWG)
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
216 	bgt $0,$onebyteloop	# U  .. .. ..	: U L U L
224 	ret $31,($26),1		# L0 .. .. ..	: L U L U