alpha/lib/ev6-stxcpy.S

28  *	E	- either cluster
57 	/* Create the 1st output word and detect 0's in the 1st input word.  */
58 	lda	t2, -1		# E : build a mask against false zero
61 	ornot	t1, t2, t2	# E : (stall)
64 	cmpbge	zero, t2, t8	# E : bits set iff null found
65 	or	t0, t3, t1	# E : (stall)
75 	addq	a0, 8, a0	# E :
80 	addq	a1, 8, a1	# E :
81 	cmpbge	zero, t1, t8	# E : (3 cycle stall)
89 	negq	t8, t6		# E : find low bit set
90 	and	t8, t6, t12	# E : (stall)
93 	and	t12, 0x80, t6	# E : (stall)
94 	bne	t6, 1f		# U : (stall)
99 	subq	t12, 1, t6	# E :
101 	or	t12, t6, t8	# E : (stall)
103 	zap	t0, t8, t0	# E : clear dst bytes <= null
104 	or	t0, t1, t1	# E : (stall)
108 1:	stq_u	t1, 0(a0)	# L :
123 	xor	a0, a1, t0	# E :
124 	unop			# E :
125 	and	t0, 7, t0	# E : (stall)
130 	and	a0, 7, t0		# E : take care not to load a word ...
131 	addq	a1, 8, a1		# E :
153 	   t6 == bytemask that is -1 in dest word bytes */
156 	addq	a1, 8, a1	# E :
161 	or	t1, t4, t1	# E :
163 	or	t0, t1, t1	# E : (stall on t1)
165 	or	t1, t6, t6	# E :
166 	cmpbge	zero, t6, t8	# E : (stall)
167 	lda	t6, -1		# E : for masking just below
171 	or	t6, t2, t2		# E :   already extracted before (stall)
172 	cmpbge	zero, t2, t8		# E :   testing eos (stall)
179 	addq	a0, 8, a0	# E :
183 	addq	a1, 8, a1	# E :
184 	cmpbge	zero, t2, t8	# E : (stall for t2)
185 	nop			# E :
204 	addq	a1, 8, a1	# E : (stall)
206 	addq	a0, 8, a0	# E :
208 	or	t0, t1, t1	# E : current dst word now complete
211 	mov	t3, t0		# E :
213 	cmpbge	zero, t2, t8	# E : test new word for eos
228 	or	t0, t1, t1	# E : first (partial) source word complete (stall)
229 	cmpbge	zero, t1, t8	# E : is the null in this first bit? (stall)
234 	addq	a0, 8, a0	# E :
236 	cmpbge	zero, t1, t8	# E : (stall)
243 	negq	t8, t6		# E : isolate low bit set
244 	and	t6, t8, t12	# E : (stall)
245 	and	t12, 0x80, t6	# E : avoid dest word load if we can (stall)
246 	bne	t6, 1f		# U : (stall)
248 	ldq_u	t0, 0(a0)	# E :
249 	subq	t12, 1, t6	# E :
250 	or	t6, t12, t8	# E : (stall)
254 	or	t0, t1, t1	# E : (stall)
258 1:	stq_u	t1, 0(a0)	# L :
268 	and	a0, 7, t4	# E : find dest misalignment
269 	and	a1, 7, t5	# E : find src misalignment
272 	mov	zero, t0	# E :
274 	mov	zero, t6	# E :
275 	beq	t4, 1f		# U :
277 	lda	t6, -1		# E :
283 1:
284 	subq	a1, t4, a1	# E : sub dest misalignment from src addr
287 	cmplt	t4, t5, t12	# E :
289 	lda	t2, -1		# E : mask out leading garbage in source
292 	ornot	t1, t2, t3	# E : (stall)
293 	cmpbge	zero, t3, t8	# E : is there a zero? (stall)
302 	negq	t8, t6		# E : build bitmask of bytes <= zero
303 	and	t6, t8, t12	# E : (stall)
304 	and	a1, 7, t5	# E :
306 	subq	t12, 1, t6	# E :
307 	or	t6, t12, t8	# E : (stall)
311 	and	t1, t2, t1	# E : to source validity mask