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116 lines
3.1 KiB
ArmAsm
116 lines
3.1 KiB
ArmAsm
/* PowerPC-32 add_n -- Add two limb vectors of equal, non-zero length.
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* Copyright (C) 1992, 1994, 1995, 1997, 1998 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "sysdep.h"
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#include "asm-syntax.h"
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#ifndef USE_PPC_PATCHES
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/*******************
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* mpi_limb_t
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* mpihelp_add_n( mpi_ptr_t res_ptr, (r3)
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* mpi_ptr_t s1_ptr, (r4)
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* mpi_ptr_t s2_ptr, (r5)
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* mpi_size_t size) (r6)
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*/
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.toc
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.extern mpihelp_add_n[DS]
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.extern .mpihelp_add_n
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.csect [PR]
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.align 2
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.globl mpihelp_add_n
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.globl .mpihelp_add_n
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.csect mpihelp_add_n[DS]
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mpihelp_add_n:
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.long .mpihelp_add_n, TOC[tc0], 0
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.csect [PR]
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.mpihelp_add_n:
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mtctr 6 # copy size into CTR
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lwz 8,0(4) # load least significant s1 limb
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lwz 0,0(5) # load least significant s2 limb
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addi 3,3,-4 # offset res_ptr, it is updated before used
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addc 7,0,8 # add least significant limbs, set cy
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bdz Lend # If done, skip loop
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Loop: lwzu 8,4(4) # load s1 limb and update s1_ptr
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lwzu 0,4(5) # load s2 limb and update s2_ptr
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stwu 7,4(3) # store previous limb in load latency slot
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adde 7,0,8 # add new limbs with cy, set cy
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bdnz Loop # decrement CTR and loop back
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Lend: stw 7,4(3) # store ultimate result limb
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li 3,0 # load cy into ...
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addze 3,3 # ... return value register
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blr
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#else
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#include "sysdep.h"
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#include "asm-syntax.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(mpihelp_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(mpihelp_add_n)
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#endif
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