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112 lines
2.8 KiB
ArmAsm
112 lines
2.8 KiB
ArmAsm
/* PowerPC-32 submul_1 -- Multiply a limb vector with a limb and subtract
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* the result from a second limb vector.
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*
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* Copyright (C) 1993, 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_submul_1( mpi_ptr_t res_ptr, (r3)
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* mpi_ptr_t s1_ptr, (r4)
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* mpi_size_t s1_size, (r5)
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* mpi_limb_t s2_limb) (r6)
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*
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* This is a fairly straightforward implementation. The timing of the PC601
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* is hard to understand, so I will wait to optimize this until I have some
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* hardware to play with.
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*
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* The code trivially generalizes to 64 bit limbs for the PC620.
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*/
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.toc
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.csect .mpihelp_submul_1[PR]
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.align 2
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.globl mpihelp_submul_1
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.globl .mpihelp_submul_1
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.csect mpihelp_submul_1[DS]
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mpihelp_submul_1:
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.long .mpihelp_submul_1[PR], TOC[tc0], 0
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.csect .mpihelp_submul_1[PR]
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.mpihelp_submul_1:
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mtctr 5
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lwz 0,0(4)
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mullw 7,0,6
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mulhwu 10,0,6
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lwz 9,0(3)
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subfc 8,7,9
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addc 7,7,8 # invert cy (r7 is junk)
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addi 3,3,-4
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bdz Lend
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Loop: lwzu 0,4(4)
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stwu 8,4(3)
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mullw 8,0,6
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adde 7,8,10
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mulhwu 10,0,6
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lwz 9,4(3)
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addze 10,10
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subfc 8,7,9
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addc 7,7,8 # invert cy (r7 is junk)
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bdnz Loop
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Lend: stw 8,4(3)
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addze 3,10
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blr
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#else
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/* mp_limb_t mpn_submul_1 (mp_ptr res_ptr, mp_srcptr s1_ptr,
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mp_size_t s1_size, mp_limb_t s2_limb)
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Calculate res-s1*s2 and put result back in res; return carry. */
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ENTRY(mpihelp_submul_1)
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mtctr %r5
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lwz %r0,0(%r4)
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mullw %r7,%r0,%r6
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mulhwu %r10,%r0,%r6
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lwz %r9,0(%r3)
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subf %r8,%r7,%r9
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addc %r7,%r7,%r8 # invert cy (r7 is junk)
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addi %r3,%r3,-4 # adjust res_ptr
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bdz 1f
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0: lwzu %r0,4(%r4)
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stwu %r8,4(%r3)
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mullw %r8,%r0,%r6
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adde %r7,%r8,%r10
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mulhwu %r10,%r0,%r6
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lwz %r9,4(%r3)
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addze %r10,%r10
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subf %r8,%r7,%r9
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addc %r7,%r7,%r8 # invert cy (r7 is junk)
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bdnz 0b
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1: stw %r8,4(%r3)
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addze %r3,%r10
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blr
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END(mpihelp_submul_1)
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#endif
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