dnl  S/390-64 mpn_copyi

dnl  Copyright 2011 Free Software Foundation, Inc.

dnl  This file is part of the GNU MP Library.

dnl

dnl  The GNU MP Library is free software; you can redistribute it and/or modify

dnl  it under the terms of either:

dnl

dnl    * the GNU Lesser General Public License as published by the Free

dnl      Software Foundation; either version 3 of the License, or (at your

dnl      option) any later version.

dnl

dnl  or

dnl

dnl    * the GNU General Public License as published by the Free Software

dnl      Foundation; either version 2 of the License, or (at your option) any

dnl      later version.

dnl

dnl  or both in parallel, as here.

dnl

dnl  The GNU MP Library is distributed in the hope that it will be useful, but

dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY

dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

dnl  for more details.

dnl

dnl  You should have received copies of the GNU General Public License and the

dnl  GNU Lesser General Public License along with the GNU MP Library.  If not,

dnl  see https://www.gnu.org/licenses/.

include(`../config.m4')

C            cycles/limb

C z900		 1.25

C z990           0.75

C z9		 ?

C z10		 1

C z196		 ?

C NOTE

C  * This is based on GNU libc memcpy which was written by Martin Schwidefsky.

C INPUT PARAMETERS

define(`rp',	`%r2')

define(`up',	`%r3')

define(`n',	`%r4')

ASM_START()

PROLOGUE(mpn_copyi)

	ltgr	%r4, %r4

	sllg	%r4, %r4, 3

	je	L(rtn)

	aghi	%r4, -1

	srlg	%r5, %r4, 8

	ltgr	%r5, %r5		C < 256 bytes to copy?

	je	L(1)

L(top):	mvc	0(256, rp), 0(up)

	la	rp, 256(rp)

	la	up, 256(up)

	brctg	%r5, L(top)

L(1):	bras	%r5, L(2)		C make r5 point to mvc insn

	mvc	0(1, rp), 0(up)

L(2):	ex	%r4, 0(%r5)		C execute mvc with length ((n-1) mod 256)+1

L(rtn):	br	%r14

EPILOGUE()