1 # PowerPC-32 __mpn_add_n -- Add two limb vectors of equal, non-zero length.
3 # Copyright (C) 1992, 1994, 1995 Free Software Foundation, Inc.
5 # This file is part of the GNU MP Library.
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30 .extern __mpn_add_n[DS]
36 .csect __mpn_add_n[DS]
38 .long .__mpn_add_n, TOC[tc0], 0
41 mtctr 6 # copy size into CTR
42 lwz 8,0(4) # load least significant s1 limb
43 lwz 0,0(5) # load least significant s2 limb
44 addi 3,3,-4 # offset res_ptr, it's updated before used
45 addc 7,0,8 # add least significant limbs, set cy
46 bdz Lend # If done, skip loop
47 Loop: lwzu 8,4(4) # load s1 limb and update s1_ptr
48 lwzu 0,4(5) # load s2 limb and update s2_ptr
49 stwu 7,4(3) # store previous limb in load latency slot
50 adde 7,0,8 # add new limbs with cy, set cy
51 bdnz Loop # decrement CTR and loop back
52 Lend: stw 7,4(3) # store ultimate result limb
53 li 3,0 # load cy into ...
54 addze 3,3 # ... return value register