1 dnl IBM POWER mpn_add_n -- Add two limb vectors of equal, non-zero length.
3 dnl Copyright 1992, 1994, 1995, 1996, 1999, 2000, 2001, 2005 Free Software
6 dnl This file is part of the GNU MP Library.
8 dnl The GNU MP Library is free software; you can redistribute it and/or modify
9 dnl it under the terms of the GNU Lesser General Public License as published
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11 dnl your option) any later version.
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15 dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
16 dnl License for more details.
18 dnl You should have received a copy of the GNU Lesser General Public License
19 dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/.
28 include(`../config.m4')
32 andil. 10,6,1 C odd or even number of limbs?
33 l 8,0(4) C load least significant s1 limb
34 l 0,0(5) C load least significant s2 limb
35 cal 3,-4(3) C offset res_ptr, it's updated before it's used
36 sri 10,6,1 C count for unrolled loop
37 a 7,0,8 C add least significant limbs, set cy
38 mtctr 10 C copy count into CTR
39 beq 0,Leven C branch if even # of limbs (# of limbs >= 2)
41 C We have an odd # of limbs. Add the first limbs separately.
42 cmpi 1,10,0 C is count for unrolled loop zero?
43 bc 4,6,L1 C bne cr1,L1 (misassembled by gas)
45 aze 3,10 C use the fact that r10 is zero...
48 C We added least significant limbs. Now reload the next limbs to enter loop.
49 L1: lu 8,4(4) C load s1 limb and update s1_ptr
50 lu 0,4(5) C load s2 limb and update s2_ptr
52 ae 7,0,8 C add limbs, set cy
53 Leven: lu 9,4(4) C load s1 limb and update s1_ptr
54 lu 10,4(5) C load s2 limb and update s2_ptr
55 bdz Lend C If done, skip loop
57 Loop: lu 8,4(4) C load s1 limb and update s1_ptr
58 lu 0,4(5) C load s2 limb and update s2_ptr
59 ae 11,10,9 C add previous limbs with cy, set cy
61 lu 9,4(4) C load s1 limb and update s1_ptr
62 lu 10,4(5) C load s2 limb and update s2_ptr
63 ae 7,0,8 C add previous limbs with cy, set cy
65 bdn Loop C decrement CTR and loop back
67 Lend: ae 11,10,9 C add limbs with cy, set cy
70 lil 3,0 C load cy into ...
71 aze 3,3 C ... return value register