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-/* Copyright (C) 2000, 2002 Free Software Foundation, Inc.
-   Contributed by Richard Henderson (rth@tamu.edu)
-   EV6 optimized by Rick Gorton <rick.gorton@alpha-processor.com>.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, write to the Free
-   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-   02111-1307 USA.  */
-
-/* Copy no more than COUNT bytes of the null-terminated string from
-   SRC to DST.
-
-   This is an internal routine used by strncpy, stpncpy, and strncat.
-   As such, it uses special linkage conventions to make implementation
-   of these public functions more efficient.
-
-   On input:
-	t9 = return address
-	a0 = DST
-	a1 = SRC
-	a2 = COUNT
-
-   Furthermore, COUNT may not be zero.
-
-   On output:
-	t0  = last word written
-	t8  = bitmask (with one bit set) indicating the last byte written
-	t10 = bitmask (with one bit set) indicating the byte position of
-	      the end of the range specified by COUNT
-	a0  = unaligned address of the last *word* written
-	a2  = the number of full words left in COUNT
-
-   Furthermore, v0, a3-a5, t11, and t12 are untouched.
-*/
-
-#include <sysdep.h>
-
-	.arch ev6
-	.set noat
-	.set noreorder
-
-/* There is a problem with either gdb (as of 4.16) or gas (as of 2.7) that
-   doesn't like putting the entry point for a procedure somewhere in the
-   middle of the procedure descriptor.  Work around this by putting the
-   aligned copy in its own procedure descriptor */
-
-
-	.ent stxncpy_aligned
-	.align 4
-stxncpy_aligned:
-	.frame sp, 0, t9, 0
-	.prologue 0
-
-	/* On entry to this basic block:
-	   t0 == the first destination word for masking back in
-	   t1 == the first source word.  */
-
-	/* Create the 1st output word and detect 0's in the 1st input word.  */
-	lda	t2, -1		# E : build a mask against false zero
-	mskqh	t2, a1, t2	# U :   detection in the src word (stall)
-	mskqh	t1, a1, t3	# U :
-	ornot	t1, t2, t2	# E : (stall)
-
-	mskql	t0, a1, t0	# U : assemble the first output word
-	cmpbge	zero, t2, t7	# E : bits set iff null found
-	or	t0, t3, t0	# E : (stall)
-	beq	a2, $a_eoc	# U :
-
-	bne	t7, $a_eos	# U :
-	nop
-	nop
-	nop
-
-	/* On entry to this basic block:
-	   t0 == a source word not containing a null.  */
-
-	/*
-	 * nops here to:
-	 *	separate store quads from load quads
-	 *	limit of 1 bcond/quad to permit training
-	 */
-$a_loop:
-	stq_u	t0, 0(a0)	# L :
-	addq	a0, 8, a0	# E :
-	subq	a2, 1, a2	# E :
-	nop
-
-	ldq_u	t0, 0(a1)	# L :
-	addq	a1, 8, a1	# E :
-	cmpbge	zero, t0, t7	# E :
-	beq	a2, $a_eoc      # U :
-
-	beq	t7, $a_loop	# U :
-	nop
-	nop
-	nop
-
-	/* Take care of the final (partial) word store.  At this point
-	   the end-of-count bit is set in t7 iff it applies.
-
-	   On entry to this basic block we have:
-	   t0 == the source word containing the null
-	   t7 == the cmpbge mask that found it.  */
-
-$a_eos:
-	negq	t7, t8		# E : find low bit set
-	and	t7, t8, t8	# E : (stall)
-	/* For the sake of the cache, don't read a destination word
-	   if we're not going to need it.  */
-	and	t8, 0x80, t6	# E : (stall)
-	bne	t6, 1f		# U : (stall)
-
-	/* We're doing a partial word store and so need to combine
-	   our source and original destination words.  */
-	ldq_u	t1, 0(a0)	# L :
-	subq	t8, 1, t6	# E :
-	or	t8, t6, t7	# E : (stall)
-	zapnot	t0, t7, t0	# U : clear src bytes > null (stall)
-
-	zap	t1, t7, t1	# .. e1 : clear dst bytes <= null
-	or	t0, t1, t0	# e1    : (stall)
-	nop
-	nop
-
-1:	stq_u	t0, 0(a0)	# L :
-	ret	(t9)		# L0 : Latency=3
-	nop
-	nop
-
-	/* Add the end-of-count bit to the eos detection bitmask.  */
-$a_eoc:
-	or	t10, t7, t7	# E :
-	br	$a_eos		# L0 : Latency=3
-	nop
-	nop
-
-	.end stxncpy_aligned
-
-	.align 4
-	.ent __stxncpy
-	.globl __stxncpy
-__stxncpy:
-	.frame sp, 0, t9, 0
-	.prologue 0
-
-	/* Are source and destination co-aligned?  */
-	xor	a0, a1, t1	# E :
-	and	a0, 7, t0	# E : find dest misalignment
-	and	t1, 7, t1	# E : (stall)
-	addq	a2, t0, a2	# E : bias count by dest misalignment (stall)
-
-	subq	a2, 1, a2	# E :
-	and	a2, 7, t2	# E : (stall)
-	srl	a2, 3, a2	# U : a2 = loop counter = (count - 1)/8 (stall)
-	addq	zero, 1, t10	# E :
-
-	sll	t10, t2, t10	# U : t10 = bitmask of last count byte
-	bne	t1, $unaligned	# U :
-	/* We are co-aligned; take care of a partial first word.  */
-	ldq_u	t1, 0(a1)	# L : load first src word
-	addq	a1, 8, a1	# E :
-
-	beq	t0, stxncpy_aligned     # U : avoid loading dest word if not needed
-	ldq_u	t0, 0(a0)	# L :
-	nop
-	nop
-
-	br	stxncpy_aligned	# .. e1 :
-	nop
-	nop
-	nop
-
-
-
-/* The source and destination are not co-aligned.  Align the destination
-   and cope.  We have to be very careful about not reading too much and
-   causing a SEGV.  */
-
-	.align 4
-$u_head:
-	/* We know just enough now to be able to assemble the first
-	   full source word.  We can still find a zero at the end of it
-	   that prevents us from outputting the whole thing.
-
-	   On entry to this basic block:
-	   t0 == the first dest word, unmasked
-	   t1 == the shifted low bits of the first source word
-	   t6 == bytemask that is -1 in dest word bytes */
-
-	ldq_u	t2, 8(a1)	# L : Latency=3 load second src word
-	addq	a1, 8, a1	# E :
-	mskql	t0, a0, t0	# U : mask trailing garbage in dst
-	extqh	t2, a1, t4	# U : (3 cycle stall on t2)
-
-	or	t1, t4, t1	# E : first aligned src word complete (stall)
-	mskqh	t1, a0, t1	# U : mask leading garbage in src (stall)
-	or	t0, t1, t0	# E : first output word complete (stall)
-	or	t0, t6, t6	# E : mask original data for zero test (stall)
-
-	cmpbge	zero, t6, t7	# E :
-	beq	a2, $u_eocfin	# U :
-	lda	t6, -1		# E :
-	nop
-
-	bne	t7, $u_final	# U :
-	mskql	t6, a1, t6	# U : mask out bits already seen
-	stq_u	t0, 0(a0)	# L : store first output word
-	or      t6, t2, t2	# E :
-
-	cmpbge	zero, t2, t7	# E : find nulls in second partial
-	addq	a0, 8, a0	# E :
-	subq	a2, 1, a2	# E :
-	bne	t7, $u_late_head_exit	# U :
-
-	/* Finally, we've got all the stupid leading edge cases taken care
-	   of and we can set up to enter the main loop.  */
-	extql	t2, a1, t1	# U : position hi-bits of lo word
-	beq	a2, $u_eoc	# U :
-	ldq_u	t2, 8(a1)	# L : read next high-order source word
-	addq	a1, 8, a1	# E :
-
-	extqh	t2, a1, t0	# U : position lo-bits of hi word (stall)
-	cmpbge	zero, t2, t7	# E :
-	nop			
-	bne	t7, $u_eos	# U :
-
-	/* Unaligned copy main loop.  In order to avoid reading too much,
-	   the loop is structured to detect zeros in aligned source words.
-	   This has, unfortunately, effectively pulled half of a loop
-	   iteration out into the head and half into the tail, but it does
-	   prevent nastiness from accumulating in the very thing we want
-	   to run as fast as possible.
-
-	   On entry to this basic block:
-	   t0 == the shifted low-order bits from the current source word
-	   t1 == the shifted high-order bits from the previous source word
-	   t2 == the unshifted current source word
-
-	   We further know that t2 does not contain a null terminator.  */
-
-	.align 4
-$u_loop:
-	or	t0, t1, t0	# E : current dst word now complete
-	subq	a2, 1, a2	# E : decrement word count
-	extql	t2, a1, t1	# U : extract high bits for next time
-	addq	a0, 8, a0	# E :
-
-	stq_u	t0, -8(a0)	# L : save the current word
-	beq	a2, $u_eoc	# U :
-	ldq_u	t2, 8(a1)	# L : Latency=3 load high word for next time
-	addq	a1, 8, a1	# E :
-
-	extqh	t2, a1, t0	# U : extract low bits (2 cycle stall)
-	cmpbge	zero, t2, t7	# E : test new word for eos
-	nop
-	beq	t7, $u_loop	# U :
-
-	/* We've found a zero somewhere in the source word we just read.
-	   If it resides in the lower half, we have one (probably partial)
-	   word to write out, and if it resides in the upper half, we
-	   have one full and one partial word left to write out.
-
-	   On entry to this basic block:
-	   t0 == the shifted low-order bits from the current source word
-	   t1 == the shifted high-order bits from the previous source word
-	   t2 == the unshifted current source word.  */
-$u_eos:
-	or	t0, t1, t0	# E : first (partial) source word complete
-	nop
-	cmpbge	zero, t0, t7	# E : is the null in this first bit? (stall)
-	bne	t7, $u_final	# U : (stall)
-
-	stq_u	t0, 0(a0)	# L : the null was in the high-order bits
-	addq	a0, 8, a0	# E :
-	subq	a2, 1, a2	# E :
-	nop
-
-$u_late_head_exit:
-	extql	t2, a1, t0	# U :
-	cmpbge	zero, t0, t7	# E :
-	or	t7, t10, t6	# E : (stall)
-	cmoveq	a2, t6, t7	# E : Latency=2, extra map slot (stall)
-
-	/* Take care of a final (probably partial) result word.
-	   On entry to this basic block:
-	   t0 == assembled source word
-	   t7 == cmpbge mask that found the null.  */
-$u_final:
-	negq	t7, t6		# E : isolate low bit set
-	and	t6, t7, t8	# E : (stall)
-	and	t8, 0x80, t6	# E : avoid dest word load if we can (stall)
-	bne	t6, 1f		# U : (stall)
-
-	ldq_u	t1, 0(a0)	# L :
-	subq	t8, 1, t6	# E :
-	or	t6, t8, t7	# E : (stall)
-	zapnot	t0, t7, t0	# U : kill source bytes > null
-
-	zap	t1, t7, t1	# U : kill dest bytes <= null
-	or	t0, t1, t0	# E : (stall)
-	nop
-	nop
-
-1:	stq_u	t0, 0(a0)	# L :
-	ret	(t9)		# L0 : Latency=3
-
-        /* Got to end-of-count before end of string.  
-           On entry to this basic block:
-           t1 == the shifted high-order bits from the previous source word  */
-$u_eoc:
-	and	a1, 7, t6	# E :
-	sll	t10, t6, t6	# U : (stall)
-	and	t6, 0xff, t6	# E : (stall)
-	bne	t6, 1f		# U : (stall)
-
-	ldq_u	t2, 8(a1)	# L : load final src word
-	nop
-	extqh	t2, a1, t0	# U : extract low bits for last word (stall)	
-	or	t1, t0, t1	# E : (stall)
-
-1:	cmpbge	zero, t1, t7	# E :
-	mov	t1, t0
-
-$u_eocfin:			# end-of-count, final word
-	or	t10, t7, t7	# E :
-	br	$u_final	# L0 : Latency=3
-
-	/* Unaligned copy entry point.  */
-	.align 4
-$unaligned:
-
-	ldq_u	t1, 0(a1)	# L : load first source word
-	and	a0, 7, t4	# E : find dest misalignment
-	and	a1, 7, t5	# E : find src misalignment
-	/* Conditionally load the first destination word and a bytemask
-	   with 0xff indicating that the destination byte is sacrosanct.  */
-	mov	zero, t0	# E :
-
-	mov	zero, t6	# E :
-	beq	t4, 1f		# U :
-	ldq_u	t0, 0(a0)	# L :
-	lda	t6, -1		# E :
-
-	mskql	t6, a0, t6	# U :
-	nop
-	nop
-1:	subq	a1, t4, a1	# E : sub dest misalignment from src addr
-
-	/* If source misalignment is larger than dest misalignment, we need
-	   extra startup checks to avoid SEGV.  */
-
-	cmplt	t4, t5, t8	# E :
-	extql	t1, a1, t1	# U : shift src into place
-	lda	t2, -1		# E : for creating masks later
-	beq	t8, $u_head	# U : (stall)
-
-	mskqh	t2, t5, t2	# U : begin src byte validity mask
-	cmpbge	zero, t1, t7	# E : is there a zero?
-	extql	t2, a1, t2	# U :
-	or	t7, t10, t5	# E : test for end-of-count too
-
-	cmpbge	zero, t2, t3	# E :
-	cmoveq	a2, t5, t7	# E : Latency=2, extra map slot
-	nop			# E : keep with cmoveq
-	andnot	t7, t3, t7	# E : (stall)
-
-	beq	t7, $u_head	# U :
-	/* At this point we've found a zero in the first partial word of
-	   the source.  We need to isolate the valid source data and mask
-	   it into the original destination data.  (Incidentally, we know
-	   that we'll need at least one byte of that original dest word.) */
-	ldq_u	t0, 0(a0)	# L :
-	negq	t7, t6		# E : build bitmask of bytes <= zero
-	mskqh	t1, t4, t1	# U :
-
-	and	t6, t7, t8	# E :
-	subq	t8, 1, t6	# E : (stall)
-	or	t6, t8, t7	# E : (stall)
-	zapnot	t2, t7, t2	# U : prepare source word; mirror changes (stall)
-
-	zapnot	t1, t7, t1	# U : to source validity mask
-	andnot	t0, t2, t0	# E : zero place for source to reside
-	or	t0, t1, t0	# E : and put it there (stall both t0, t1)
-	stq_u	t0, 0(a0)	# L : (stall)
-
-	ret	(t9)		# L0 : Latency=3
-	nop
-	nop
-	nop
-
-	.end __stxncpy
-