1 files changed, 103 insertions, 0 deletions
diff --git a/sysdeps/alpha/stpncpy.S b/sysdeps/alpha/stpncpy.S
new file mode 100644
index 0000000000..50cda2672e
--- /dev/null
+++ b/sysdeps/alpha/stpncpy.S
@@ -0,0 +1,103 @@
+/* Copyright (C) 1996 Free Software Foundation, Inc.
+   Contributed by Richard Henderson (rth@tamu.edu)
+
+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 Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+/* Copy no more than COUNT bytes of the null-terminated string from 
+   SRC to DST.  If SRC does not cover all of COUNT, the balance is
+   zeroed.  Return the address of the terminating null in DEST, if
+   any, else DEST + COUNT.  */
+
+#include <sysdep.h>
+
+	.set noat
+	.set noreorder
+
+	.text
+
+ENTRY(__stpncpy)
+	ldgp	gp, 0(pv)
+	.prologue 1
+	
+	beq	a2, $zerocount
+	jsr	t9, __stxncpy	# do the work of the copy
+
+	and	t8, 0xf0, t3	# binary search for byte offset of the
+	and	t8, 0xcc, t2	# last byte written.
+	and	t8, 0xaa, t1
+	andnot	a0, 7, v0
+	cmovne	t3, 4, t3
+	cmovne	t2, 2, t2
+	cmovne	t1, 1, t1
+	addq	v0, t3, v0
+	addq	t1, t2, t1
+	addq	v0, t1, v0
+
+	bne	a2, $multiword	# do we have full words left?
+
+	.align 3
+	zapnot	t0, t8, t4	# e0    : was last byte a null?
+	subq	t8, 1, t2	# .. e1 :
+	addq	v0, 1, t5	# e0    :
+	subq	t10, 1, t3	# .. e1 :
+	or	t2, t8, t2	# e0    : clear the bits between the last
+	or	t3, t10, t3	# .. e1 : written byte and the last byte in
+	andnot	t3, t2, t3	# e0    : COUNT
+	cmovne	t4, t5, v0	# .. e1 : if last written wasnt null, inc v0
+	zap	t0, t3, t0	# e0    :
+	stq_u	t0, 0(a0)	# e1    :
+	ret			# .. e1 :
+
+	.align 3
+$multiword:
+	subq	t8, 1, t7	# e0    : clear the final bits in the prev
+	or	t7, t8, t7	# e1    : word
+	zapnot	t0, t7, t0	# e0    :
+	subq	a2, 1, a2	# .. e1 :
+	stq_u	t0, 0(a0)	# e0    :
+	addq	a0, 8, a0	# .. e1 :
+
+	beq	a2, 1f		# e1    :
+	blbc	a2, 0f		# e1    :
+
+	stq_u	zero, 0(a0)	# e0    : zero one word
+	subq	a2, 1, a2	# .. e1 :
+	addq	a0, 8, a0	# e0    :
+	beq	a2, 1f		# .. e1 :
+
+0:	stq_u	zero, 0(a0)	# e0    : zero two words
+	subq	a2, 2, a2	# .. e1 :
+	stq_u	zero, 8(a0)	# e0    :
+	addq	a0, 16, a0	# .. e1 :
+	bne	a2, 0b		# e1    :
+	unop
+
+1:	ldq_u	t0, 0(a0)	# e0    : clear the leading bits in the final
+	subq	t10, 1, t7	# .. e1 : word
+	or	t7, t10, t7	# e0    :
+	zap	t0, t7, t0	# e1 (stall)
+	stq_u	t0, 0(a0)	# e0    :
+	ret			# .. e1 :
+
+$zerocount:
+	mov	a0, v0
+	ret
+
+	END(__stpncpy)
+
+weak_alias (__stpncpy, stpncpy)