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+; mc88100 __mpn_add -- Add two limb vectors of the same length > 0 and store
+; sum in a third limb vector.
+
+; Copyright (C) 1992, 1994 Free Software Foundation, Inc.
+
+; This file is part of the GNU MP Library.
+
+; The GNU MP Library is free software; you can redistribute it and/or modify
+; it under the terms of the GNU General Public License as published by
+; the Free Software Foundation; either version 2, or (at your option)
+; any later version.
+
+; The GNU MP 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 General Public License for more details.
+
+; You should have received a copy of the GNU General Public License
+; along with the GNU MP Library; see the file COPYING. If not, write to
+; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+
+; INPUT PARAMETERS
+; res_ptr r2
+; s1_ptr r3
+; s2_ptr r4
+; size r5
+
+; This code has been optimized to run one instruction per clock, avoiding
+; load stalls and writeback contention. As a result, the instruction
+; order is not always natural.
+
+; The speed is approximately 4.3 clocks/limb + 18 clocks/limb-vector.
+
+#include "sysdep.h"
+
+ENTRY (__mpn_add_n)
+ ld r6,r3,0 ; read first limb from s1_ptr
+ extu r10,r5,4
+ ld r7,r4,0 ; read first limb from s2_ptr
+
+ subu.co r5,r0,r5 ; (clear carry as side effect)
+ mak r5,r5,4<4>
+ bcnd eq0,r5,Lzero
+
+ or r12,r0,lo16(Lbase)
+ or.u r12,r12,hi16(Lbase)
+ addu r12,r12,r5 ; r12 is address for entering in loop
+
+ extu r5,r5,2 ; divide by 4
+ subu r2,r2,r5 ; adjust res_ptr
+ subu r3,r3,r5 ; adjust s1_ptr
+ subu r4,r4,r5 ; adjust s2_ptr
+
+ or r8,r6,r0
+
+ jmp.n r12
+ or r9,r7,r0
+
+Loop: addu r3,r3,64
+ st r8,r2,60
+ addu r4,r4,64
+ ld r6,r3,0
+ addu r2,r2,64
+ ld r7,r4,0
+Lzero: subu r10,r10,1 ; add 0 + 16r limbs (adjust loop counter)
+Lbase: ld r8,r3,4
+ addu.cio r6,r6,r7
+ ld r9,r4,4
+ st r6,r2,0
+ ld r6,r3,8 ; add 15 + 16r limbs
+ addu.cio r8,r8,r9
+ ld r7,r4,8
+ st r8,r2,4
+ ld r8,r3,12 ; add 14 + 16r limbs
+ addu.cio r6,r6,r7
+ ld r9,r4,12
+ st r6,r2,8
+ ld r6,r3,16 ; add 13 + 16r limbs
+ addu.cio r8,r8,r9
+ ld r7,r4,16
+ st r8,r2,12
+ ld r8,r3,20 ; add 12 + 16r limbs
+ addu.cio r6,r6,r7
+ ld r9,r4,20
+ st r6,r2,16
+ ld r6,r3,24 ; add 11 + 16r limbs
+ addu.cio r8,r8,r9
+ ld r7,r4,24
+ st r8,r2,20
+ ld r8,r3,28 ; add 10 + 16r limbs
+ addu.cio r6,r6,r7
+ ld r9,r4,28
+ st r6,r2,24
+ ld r6,r3,32 ; add 9 + 16r limbs
+ addu.cio r8,r8,r9
+ ld r7,r4,32
+ st r8,r2,28
+ ld r8,r3,36 ; add 8 + 16r limbs
+ addu.cio r6,r6,r7
+ ld r9,r4,36
+ st r6,r2,32
+ ld r6,r3,40 ; add 7 + 16r limbs
+ addu.cio r8,r8,r9
+ ld r7,r4,40
+ st r8,r2,36
+ ld r8,r3,44 ; add 6 + 16r limbs
+ addu.cio r6,r6,r7
+ ld r9,r4,44
+ st r6,r2,40
+ ld r6,r3,48 ; add 5 + 16r limbs
+ addu.cio r8,r8,r9
+ ld r7,r4,48
+ st r8,r2,44
+ ld r8,r3,52 ; add 4 + 16r limbs
+ addu.cio r6,r6,r7
+ ld r9,r4,52
+ st r6,r2,48
+ ld r6,r3,56 ; add 3 + 16r limbs
+ addu.cio r8,r8,r9
+ ld r7,r4,56
+ st r8,r2,52
+ ld r8,r3,60 ; add 2 + 16r limbs
+ addu.cio r6,r6,r7
+ ld r9,r4,60
+ st r6,r2,56
+ bcnd.n ne0,r10,Loop ; add 1 + 16r limbs
+ addu.cio r8,r8,r9
+
+ st r8,r2,60 ; store most significant limb
+
+ jmp.n r1
+ addu.ci r2,r0,r0 ; return carry-out from most sign. limb