dnl  PowerPC 750 mpn_com -- mpn bitwise one's complement

dnl  Copyright 2002, 2003 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 603e:            ?

C 604e:            3.0

C 75x (G3):        2.0

C 7400,7410 (G4):  2.0

C 744x,745x (G4+): 3.0

C void mpn_com (mp_ptr dst, mp_srcptr src, mp_size_t size);

C

C This loop form is necessary for the claimed speed.

ASM_START()

PROLOGUE(mpn_com)

	C r3	dst

	C r4	src

	C r5	size

	mtctr	r5		C size

	lwz	r5, 0(r4)	C src low limb

	sub	r4, r4, r3	C src-dst

	subi	r3, r3, 4	C dst-4

	addi	r4, r4, 8	C src-dst+8

	bdz	L(one)

L(top):

	C r3	&dst[i-1]

	C r4	src-dst

	C r5	src[i]

	C r6	scratch

	not	r6, r5		C ~src[i]

	lwzx	r5, r4,r3	C src[i+1]

	stwu	r6, 4(r3)	C dst[i]

	bdnz	L(top)

L(one):

	not	r6, r5

	stw	r6, 4(r3)	C dst[size-1]

	blr

EPILOGUE()