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/* PowerPC64 mpn_lshift -- mpn_add_n/mpn_sub_n -- mpn addition and
subtraction.
Copyright (C) 2003-2021 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
<https://www.gnu.org/licenses/>. */
#include <sysdep.h>
/* cycles/limb
* POWER7 2.18
*/
#ifdef USE_AS_SUB
# define FUNC __mpn_sub_n
# define ADDSUBC subfe
#else
# define FUNC __mpn_add_n
# define ADDSUBC adde
#endif
#define RP r3
#define UP r4
#define VP r5
#define N r6
ENTRY_TOCLESS (FUNC, 5)
#ifdef USE_AS_SUB
addic r0, r1, -1
#else
addic r0, r0, 0
#endif
andi. r7, N, 1
beq L(bx0)
ld r7, 0(UP)
ld r9, 0(VP)
ADDSUBC r11, r9, r7
std r11, 0(RP)
cmpldi N, N, 1
beq N, L(end)
addi UP, UP, 8
addi VP, VP, 8
addi RP, RP, 8
L(bx0): addi r0, N, 2
srdi r0, r0, 2
mtctr r0
andi. r7, N, 2
bne L(mid)
addi UP, UP, 16
addi VP, VP, 16
addi RP, RP, 16
.align 5
L(top): ld r6, -16(UP)
ld r7, -8(UP)
ld r8, -16(VP)
ld r9, -8(VP)
ADDSUBC r10, r8, N
ADDSUBC r11, r9, r7
std r10, -16(RP)
std r11, -8(RP)
L(mid): ld r6, 0(UP)
ld r7, 8(UP)
ld r8, 0(VP)
ld r9, 8(VP)
ADDSUBC r10, r8, N
ADDSUBC r11, r9, r7
std r10, 0(RP)
std r11, 8(RP)
addi UP, UP, 32
addi VP, VP, 32
addi RP, RP, 32
bdnz L(top)
L(end): subfe r3, r0, r0
#ifdef USE_AS_SUB
neg r3, r3
#else
addi r3, r3, 1
#endif
blr
END(FUNC)
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