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* optimized for the PA7100, where is runs at 3.25 cycles/limb
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* Copyright (C) 1992, 1994 Free Software Foundation, Inc.
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* Copyright (C) 1998 Free Software Foundation, Inc.
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* This file is part of GNUPG.
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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 2 of the License, or
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* (at your option) any later version.
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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* Note: This code is heavily based on the GNU MP Library.
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* Actually it's the same code with only minor changes in the
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* way the data is stored; this is to support the abstraction
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* of an optional secure memory allocation which may be used
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* to avoid revealing of sensitive data due to paging etc.
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* The GNU MP Library itself is published under the LGPL;
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* however I decided to publish this code under the plain GPL.
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* mpihelp_lshift( mpi_ptr_t wp, (gr26)
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* mpi_ptr_t up, (gr25)
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* mpi_size_t usize, (gr24)
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* unsigned cnt) (gr23)
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.export mpihelp_lshift
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.callinfo frame=64,no_calls
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ldws,mb -4(0,%r25),%r22
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addib,= -1,%r24,L$0004
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vshd %r0,%r22,%r28 ; compute carry out limb
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ldws,mb -4(0,%r25),%r29
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addib,<= -5,%r24,L$rest
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L$loop ldws,mb -4(0,%r25),%r22
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stws,mb %r20,-4(0,%r26)
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ldws,mb -4(0,%r25),%r29
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stws,mb %r20,-4(0,%r26)
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ldws,mb -4(0,%r25),%r22
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stws,mb %r20,-4(0,%r26)
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ldws,mb -4(0,%r25),%r29
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stws,mb %r20,-4(0,%r26)
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addib,> -4,%r24,L$loop
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L$rest addib,= 4,%r24,L$end1
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L$eloop ldws,mb -4(0,%r25),%r22
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stws,mb %r20,-4(0,%r26)
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addib,<= -1,%r24,L$end2
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ldws,mb -4(0,%r25),%r29
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stws,mb %r20,-4(0,%r26)
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addib,> -1,%r24,L$eloop
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L$end1 stws,mb %r20,-4(0,%r26)
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L$end2 stws,mb %r20,-4(0,%r26)
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L$0004 vshd %r22,%r0,%r20
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* mpihelp_rshift( mpi_ptr_t wp, (gr26)
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* mpi_ptr_t up, (gr25)
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* mpi_size_t usize, (gr24)
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* unsigned cnt) (gr23)
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.export mpihelp_rshift
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.callinfo frame=64,no_calls
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ldws,ma 4(0,%r25),%r22
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addib,= -1,%r24,L$r004
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vshd %r22,%r0,%r28 ; compute carry out limb
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ldws,ma 4(0,%r25),%r29
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addib,<= -5,%r24,L$rrest
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L$roop ldws,ma 4(0,%r25),%r22
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stws,ma %r20,4(0,%r26)
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ldws,ma 4(0,%r25),%r29
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stws,ma %r20,4(0,%r26)
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ldws,ma 4(0,%r25),%r22
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stws,ma %r20,4(0,%r26)
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ldws,ma 4(0,%r25),%r29
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stws,ma %r20,4(0,%r26)
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addib,> -4,%r24,L$roop
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L$rrest addib,= 4,%r24,L$rend1
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L$eroop ldws,ma 4(0,%r25),%r22
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stws,ma %r20,4(0,%r26)
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addib,<= -1,%r24,L$rend2
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ldws,ma 4(0,%r25),%r29
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stws,ma %r20,4(0,%r26)
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addib,> -1,%r24,L$eroop
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L$rend1 stws,ma %r20,4(0,%r26)
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L$rend2 stws,ma %r20,4(0,%r26)
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L$r004 vshd %r0,%r22,%r20
added
removed
mpi/pa7100/mpih-shift.S
