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+dnl IBM POWER mpn_add_n -- Add two limb vectors of equal, non-zero length.
+
+dnl Copyright 1992, 1994-1996, 1999-2001, 2005 Free Software Foundation, Inc.
+
+dnl This file is part of the GNU MP Library.
+dnl
+dnl The GNU MP Library is free software; you can redistribute it and/or modify
+dnl it under the terms of either:
+dnl
+dnl * the GNU Lesser General Public License as published by the Free
+dnl Software Foundation; either version 3 of the License, or (at your
+dnl option) any later version.
+dnl
+dnl or
+dnl
+dnl * the GNU General Public License as published by the Free Software
+dnl Foundation; either version 2 of the License, or (at your option) any
+dnl later version.
+dnl
+dnl or both in parallel, as here.
+dnl
+dnl The GNU MP Library is distributed in the hope that it will be useful, but
+dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+dnl for more details.
+dnl
+dnl You should have received copies of the GNU General Public License and the
+dnl GNU Lesser General Public License along with the GNU MP Library. If not,
+dnl see https://www.gnu.org/licenses/.
+
+
+dnl INPUT PARAMETERS
+dnl res_ptr r3
+dnl s1_ptr r4
+dnl s2_ptr r5
+dnl size r6
+
+include(`../config.m4')
+
+ASM_START()
+PROLOGUE(mpn_add_n)
+ andil. 10,6,1 C odd or even number of limbs?
+ l 8,0(4) C load least significant s1 limb
+ l 0,0(5) C load least significant s2 limb
+ cal 3,-4(3) C offset res_ptr, it's updated before it's used
+ sri 10,6,1 C count for unrolled loop
+ a 7,0,8 C add least significant limbs, set cy
+ mtctr 10 C copy count into CTR
+ beq 0,Leven C branch if even # of limbs (# of limbs >= 2)
+
+C We have an odd # of limbs. Add the first limbs separately.
+ cmpi 1,10,0 C is count for unrolled loop zero?
+ bc 4,6,L1 C bne cr1,L1 (misassembled by gas)
+ st 7,4(3)
+ aze 3,10 C use the fact that r10 is zero...
+ br C return
+
+C We added least significant limbs. Now reload the next limbs to enter loop.
+L1: lu 8,4(4) C load s1 limb and update s1_ptr
+ lu 0,4(5) C load s2 limb and update s2_ptr
+ stu 7,4(3)
+ ae 7,0,8 C add limbs, set cy
+Leven: lu 9,4(4) C load s1 limb and update s1_ptr
+ lu 10,4(5) C load s2 limb and update s2_ptr
+ bdz Lend C If done, skip loop
+
+Loop: lu 8,4(4) C load s1 limb and update s1_ptr
+ lu 0,4(5) C load s2 limb and update s2_ptr
+ ae 11,10,9 C add previous limbs with cy, set cy
+ stu 7,4(3) C
+ lu 9,4(4) C load s1 limb and update s1_ptr
+ lu 10,4(5) C load s2 limb and update s2_ptr
+ ae 7,0,8 C add previous limbs with cy, set cy
+ stu 11,4(3) C
+ bdn Loop C decrement CTR and loop back
+
+Lend: ae 11,10,9 C add limbs with cy, set cy
+ st 7,4(3) C
+ st 11,8(3) C
+ lil 3,0 C load cy into ...
+ aze 3,3 C ... return value register
+ br
+EPILOGUE(mpn_add_n)