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-/* mc68020 __mpn_sub_n -- Subtract two limb vectors of the same length > 0 and
- * store difference in a third limb vector.
- *
- * Copyright (C) 1992, 1994, 1996, 1998,
- * 2001 Free Software Foundation, Inc.
- *
- * This file is part of GnuPG.
- *
- * GnuPG is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * GnuPG is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
- *
- * Note: This code is heavily based on the GNU MP Library.
- * Actually it's the same code with only minor changes in the
- * way the data is stored; this is to support the abstraction
- * of an optional secure memory allocation which may be used
- * to avoid revealing of sensitive data due to paging etc.
- * The GNU MP Library itself is published under the LGPL;
- * however I decided to publish this code under the plain GPL.
- */
-
-#include "sysdep.h"
-#include "asm-syntax.h"
-
-
-/*******************
- * mpi_limb_t
- * mpihelp_sub_n( mpi_ptr_t res_ptr, (sp + 4)
- * mpi_ptr_t s1_ptr, (sp + 8)
- * mpi_ptr_t s2_ptr, (sp + 16)
- * mpi_size_t size) (sp + 12)
- */
-
-
- TEXT
- ALIGN
- GLOBL C_SYMBOL_NAME(mpihelp_sub_n)
-
-C_SYMBOL_NAME(mpihelp_sub_n:)
-PROLOG(mpihelp_sub_n)
-/* Save used registers on the stack. */
- movel R(d2),MEM_PREDEC(sp)
- movel R(a2),MEM_PREDEC(sp)
-
-/* Copy the arguments to registers. Better use movem? */
- movel MEM_DISP(sp,12),R(a2)
- movel MEM_DISP(sp,16),R(a0)
- movel MEM_DISP(sp,20),R(a1)
- movel MEM_DISP(sp,24),R(d2)
-
- eorw #1,R(d2)
- lsrl #1,R(d2)
- bcc L(L1)
- subql #1,R(d2) /* clears cy as side effect */
-
-L(Loop:)
- movel MEM_POSTINC(a0),R(d0)
- movel MEM_POSTINC(a1),R(d1)
- subxl R(d1),R(d0)
- movel R(d0),MEM_POSTINC(a2)
-L(L1:) movel MEM_POSTINC(a0),R(d0)
- movel MEM_POSTINC(a1),R(d1)
- subxl R(d1),R(d0)
- movel R(d0),MEM_POSTINC(a2)
-
- dbf R(d2),L(Loop) /* loop until 16 lsb of %4 == -1 */
- subxl R(d0),R(d0) /* d0 <= -cy; save cy as 0 or -1 in d0 */
- subl #0x10000,R(d2)
- bcs L(L2)
- addl R(d0),R(d0) /* restore cy */
- bra L(Loop)
-
-L(L2:)
- negl R(d0)
-
-/* Restore used registers from stack frame. */
- movel MEM_POSTINC(sp),R(a2)
- movel MEM_POSTINC(sp),R(d2)
-
- rts
-EPILOG(mpihelp_sub_n)
-
-