69 lines
2.0 KiB
ArmAsm
69 lines
2.0 KiB
ArmAsm
/* Add two limb vectors of equal, non-zero length for PowerPC.
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Copyright (C) 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <sysdep.h>
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/* mp_limb_t mpn_add_n (mp_ptr res_ptr, mp_srcptr s1_ptr, mp_srcptr s2_ptr,
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mp_size_t size)
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Calculate s1+s2 and put result in res_ptr; return carry, 0 or 1. */
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/* Note on optimisation: This code is optimal for the 601. Almost every other
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possible 2-unrolled inner loop will not be. Also, watch out for the
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alignment... */
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EALIGN(__mpn_add_n,3,0)
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/* Set up for loop below. */
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mtcrf 0x01,%r6
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srwi. %r7,%r6,1
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li %r10,0
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mtctr %r7
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bt 31,2f
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/* Clear the carry. */
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addic %r0,%r0,0
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/* Adjust pointers for loop. */
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addi %r3,%r3,-4
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addi %r4,%r4,-4
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addi %r5,%r5,-4
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b 0f
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2: lwz %r7,0(%r5)
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lwz %r6,0(%r4)
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addc %r6,%r6,%r7
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stw %r6,0(%r3)
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beq 1f
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/* The loop. */
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/* Align start of loop to an odd word boundary to guarantee that the
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last two words can be fetched in one access (for 601). */
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0: lwz %r9,4(%r4)
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lwz %r8,4(%r5)
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lwzu %r6,8(%r4)
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lwzu %r7,8(%r5)
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adde %r8,%r9,%r8
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stw %r8,4(%r3)
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adde %r6,%r6,%r7
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stwu %r6,8(%r3)
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bdnz 0b
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/* Return the carry. */
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1: addze %r3,%r10
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blr
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END(__mpn_add_n)
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