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dnl SPARC mpn_add_n -- Add two limb vectors of the same length > 0 and store
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dnl sum in a third limb vector.
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dnl Copyright 1995, 1996, 2000 Free Software Foundation, Inc.
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dnl This file is part of the GNU MP Library.
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dnl The GNU MP Library is free software; you can redistribute it and/or modify
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dnl it under the terms of the GNU Lesser General Public License as published
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dnl by the Free Software Foundation; either version 2.1 of the License, or (at
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dnl your option) any later version.
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dnl The GNU MP Library is distributed in the hope that it will be useful, but
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dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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dnl License for more details.
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dnl You should have received a copy of the GNU Lesser General Public License
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dnl along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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dnl the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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dnl MA 02111-1307, USA.
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include(`../config.m4')
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xor s2_ptr,res_ptr,%g1
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bne L(1) C branch if alignment differs
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L(0): andcc res_ptr,4,%g0 C res_ptr unaligned? Side effect: cy=0
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be L(v1) C if no, branch
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C Add least significant limb separately to align res_ptr and s2_ptr
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L(v1): addx %g0,%g0,%o4 C save cy in register
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cmp n,2 C if n < 2 ...
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bl L(end2) C ... branch to tail code
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subcc %g0,%o4,%g0 C restore cy
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subcc %g0,%o4,%g0 C restore cy
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C Add blocks of 8 limbs until less than 8 limbs remain
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addx %g0,%g0,%o4 C save cy in register
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add res_ptr,32,res_ptr
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subcc %g0,%o4,%g0 C restore cy
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subcc %g0,%o4,%g0 C restore cy
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C Add blocks of 2 limbs until less than 2 limbs remain
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addx %g0,%g0,%o4 C save cy in register
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add res_ptr,8,res_ptr
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subcc %g0,%o4,%g0 C restore cy
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addx %g0,%g0,%o4 C save cy in register
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subcc %g0,%o4,%g0 C restore cy
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addx %g0,%g0,%o0 C return carry-out from most sign. limb
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L(1): xor s1_ptr,res_ptr,%g1
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C If we come here, the alignment of s1_ptr and res_ptr as well as the
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C alignment of s2_ptr and res_ptr differ. Since there are only two ways
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C things can be aligned (that we care about) we now know that the alignment
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C of s1_ptr and s2_ptr are the same.
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andcc s1_ptr,4,%g0 C s1_ptr unaligned? Side effect: cy=0
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be L(v2) C if no, branch
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C Add least significant limb separately to align s1_ptr and s2_ptr
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add res_ptr,4,res_ptr
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L(v2): addx %g0,%g0,%o4 C save cy in register
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subcc %g0,%o4,%g0 C restore cy
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C Add blocks of 8 limbs until less than 8 limbs remain
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addx %g0,%g0,%o4 C save cy in register
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add res_ptr,32,res_ptr
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subcc %g0,%o4,%g0 C restore cy
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subcc %g0,%o4,%g0 C restore cy
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addx %g0,%g0,%o4 C save cy in register
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add res_ptr,8,res_ptr
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subcc %g0,%o4,%g0 C restore cy
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subcc %g0,%o4,%g0 C restore cy
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addx %g0,%g0,%o0 C return carry-out from most sign. limb