alpha/lib/ev6-clear_user.S

20  *	L	- lower subcluster; L0 - subcluster L0; L1 - subcluster L1
54 	beq	$0, $zerolength # U  .. .. ..	:  U L U L
56 	addq	$0, $4, $1	# .. .. .. E	: bias counter
57 	and	$1, 7, $2	# .. .. E  ..	: number of misaligned bytes in tail
60 	srl	$1, 3, $1	# .. E  .. ..	: number of quadwords to clear
61 	beq	$4, $headalign	# U  .. .. ..	: U L U L
67 	EX( ldq_u $5, 0($16) )	# .. .. .. L	: load dst word to mask back in
68 	beq	$1, $onebyte	# .. .. U  ..	: sub-word store?
70 	addq	$16, 8, $16	# E  .. .. .. 	: L U U L
72 	EX( stq_u $5, -8($16) )	# .. .. .. L	:
73 	subq	$1, 1, $1	# .. .. E  ..	:
75 	subq	$0, 8, $0	# E  .. .. ..	: U L U L
81  * $1 is number of quadwords to clear (zero is a valid value)
86 	subq	$1, 16, $4	# .. .. .. E	: If < 16, we can not use the huge loop
89 	blt	$4, $trailquad	# U  .. .. ..	: U L U L
101 	beq	$3, $bigalign	# U  .. .. ..	: U L U L : Aligned 0mod64
104 	EX( stq_u $31, 0($16) )	# .. .. .. L
107 	nop			# E  .. .. ..	: U L U L
110 	subq	$1, 1, $1	# .. .. E  ..
112 	blt	$3, $alignmod64	# U  .. .. ..	: U L U L
117  * $1 is the number of quads left
120  * CWG Section 3.7.6: do not expect a sustained store rate of > 1/cycle
135 	bis	$16,$16,$3	# E : U L U L : Initial wh64 address is dest
140 	subq	$1, 16, $4	# .. .. E  ..	: Forward calculation - repeat the loop?
141 	EX( stq_u $31, 0($16) )	# .. L  .. ..
142 	subq	$0, 8, $0	# E  .. .. ..	: U L U L
145 	EX( stq_u $31, 8($16) )	# L :
146 	EX( stq_u $31, 16($16) )	# L :
147 	subq	$0, 16, $0	# E : U L L U
150 	EX( stq_u $31, 24($16) )	# L :
151 	EX( stq_u $31, 32($16) )	# L :
152 	subq	$0, 168, $5	# E : U L L U : two trips through the loop left?
156 	EX( stq_u $31, 40($16) )	# L :
157 	EX( stq_u $31, 48($16) )	# L :
158 	cmovlt	$5, $16, $3	# E : U L L U : Latency 2, extra mapping cycle
160 	subq	$1, 8, $1	# E :
162 	EX( stq_u $31, 56($16) )	# L :
163 	nop			# E : U L U L
168 	bge	$4, $do_wh64	# U : U L U L
172 	# $1 is the number of quadwords left to go.
177 	beq	$1, $trailbytes	# U  .. .. ..	: U L U L : Only 0..7 bytes to go
180 	EX( stq_u $31, 0($16) )	# .. .. .. L
181 	subq	$1, 1, $1	# .. .. E  ..
183 	nop			# E  .. .. ..	: U L U L
188 	bgt	$1, $onequad	# U  .. .. ..	: U L U L
195 	beq	$0, $zerolength	# U  .. .. ..	: U L U L
201 	EX( stb $31, 0($16) )	# .. .. .. L
202 	subq	$0, 1, $0	# .. .. E  ..	:
203 	addq	$16, 1, $16	# .. E  .. ..	:
204 	bgt	$0, $onebyte	# U  .. .. ..	: U L U L
211 	ret	$31, ($26), 1	# L0 .. .. ..	: L U L U