mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 13:30:06 +00:00
69 lines
1.9 KiB
ArmAsm
69 lines
1.9 KiB
ArmAsm
/* Add two limb vectors of equal, non-zero length for PowerPC.
|
|
Copyright (C) 1997-2017 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_add_n (mp_ptr res_ptr, mp_srcptr s1_ptr, mp_srcptr s2_ptr,
|
|
mp_size_t size)
|
|
Calculate s1+s2 and put result in res_ptr; return carry, 0 or 1. */
|
|
|
|
/* Note on optimisation: This code is optimal for the 601. Almost every other
|
|
possible 2-unrolled inner loop will not be. Also, watch out for the
|
|
alignment... */
|
|
|
|
EALIGN (__mpn_add_n, 3, 0)
|
|
|
|
/* Set up for loop below. */
|
|
mtcrf 0x01,r6
|
|
srwi. r7,r6,1
|
|
li r10,0
|
|
mtctr r7
|
|
bt 31,L(2)
|
|
|
|
/* Clear the carry. */
|
|
addic r0,r0,0
|
|
/* Adjust pointers for loop. */
|
|
addi r3,r3,-4
|
|
addi r4,r4,-4
|
|
addi r5,r5,-4
|
|
b L(0)
|
|
|
|
L(2): lwz r7,0(r5)
|
|
lwz r6,0(r4)
|
|
addc r6,r6,r7
|
|
stw r6,0(r3)
|
|
beq L(1)
|
|
|
|
/* The loop. */
|
|
|
|
/* Align start of loop to an odd word boundary to guarantee that the
|
|
last two words can be fetched in one access (for 601). */
|
|
L(0): lwz r9,4(r4)
|
|
lwz r8,4(r5)
|
|
lwzu r6,8(r4)
|
|
lwzu r7,8(r5)
|
|
adde r8,r9,r8
|
|
stw r8,4(r3)
|
|
adde r6,r6,r7
|
|
stwu r6,8(r3)
|
|
bdnz L(0)
|
|
/* Return the carry. */
|
|
L(1): addze r3,r10
|
|
blr
|
|
END (__mpn_add_n)
|