/* Multiply a limb vector by a single limb, for PowerPC.

   Copyright (C) 1993-2018 Free Software Foundation, Inc.

   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, see

   <http://www.gnu.org/licenses/>.  */

#include <sysdep.h>

/* mp_limb_t mpn_submul_1 (mp_ptr res_ptr, mp_srcptr s1_ptr,

                           mp_size_t s1_size, mp_limb_t s2_limb)

   Calculate res-s1*s2 and put result back in res; return carry.  */

ENTRY (__mpn_submul_1)

	mtctr	r5

	lwz	r0,0(r4)

	mullw	r7,r0,r6

	mulhwu	r10,r0,r6

	lwz     r9,0(r3)

	subf 	r8,r7,r9

	addc    r7,r7,r8		# invert cy (r7 is junk)

	addi	r3,r3,-4		# adjust res_ptr

	bdz	L(1)

L(0):	lwzu	r0,4(r4)

	stwu	r8,4(r3)

	mullw	r8,r0,r6

	adde	r7,r8,r10

	mulhwu	r10,r0,r6

	lwz     r9,4(r3)

	addze   r10,r10

	subf    r8,r7,r9

	addc    r7,r7,r8		# invert cy (r7 is junk)

	bdnz	L(0)

L(1):	stw	r8,4(r3)

	addze	r3,r10

	blr

END (__mpn_submul_1)