home *** CD-ROM | disk | FTP | other *** search
- /* mc68020 __mpn_addmul_1 -- Multiply a limb vector with a limb and add
- the result to a second limb vector.
-
- Copyright (C) 1992, 1994 Free Software Foundation, Inc.
-
- This file is part of the GNU MP Library.
-
- The GNU MP Library is free software; you can redistribute it and/or modify
- it under the terms of the GNU Library General Public License as published by
- the Free Software Foundation; either version 2 of the License, or (at your
- option) any later version.
-
- The GNU MP Library 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 Library General Public
- License for more details.
-
- You should have received a copy of the GNU Library General Public License
- along with the GNU MP Library; see the file COPYING.LIB. If not, write to
- the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- /*
- INPUT PARAMETERS
- res_ptr (sp + 4)
- s1_ptr (sp + 8)
- size (sp + 12)
- s2_limb (sp + 16)
- */
-
- #include "asm-syntax.h"
-
- TEXT
- ALIGN
- GLOBL ___mpn_addmul_1
-
- LAB(___mpn_addmul_1)
-
- #define res_ptr a0
- #define s1_ptr a1
- #define size d2
- #define s2_limb d4
-
- /* Save used registers on the stack. */
- INSN2(movem,l ,MEM_PREDEC(sp),d2-d5)
-
- /* Copy the arguments to registers. Better use movem? */
- INSN2(move,l ,res_ptr,MEM_DISP(sp,20))
- INSN2(move,l ,s1_ptr,MEM_DISP(sp,24))
- INSN2(move,l ,size,MEM_DISP(sp,28))
- INSN2(move,l ,s2_limb,MEM_DISP(sp,32))
-
- INSN2(eor,w ,size,#1)
- INSN1(clr,l ,d1)
- INSN1(clr,l ,d5)
- INSN2(lsr,l ,size,#1)
- bcc L1
- INSN2(subq,l ,size,#1)
- INSN2(sub,l ,d0,d0) /* (d0,cy) <= (0,0) */
-
- LAB(Loop)
- INSN2(move,l ,d3,MEM_POSTINC(s1_ptr))
- INSN2(mulu,l ,d1:d3,s2_limb)
- INSN2(addx,l ,d3,d0)
- INSN2(addx,l ,d1,d5)
- INSN2(add,l ,MEM_POSTINC(res_ptr),d3)
- LAB(L1) INSN2(move,l ,d3,MEM_POSTINC(s1_ptr))
- INSN2(mulu,l ,d0:d3,s2_limb)
- INSN2(addx,l ,d3,d1)
- INSN2(addx,l ,d0,d5)
- INSN2(add,l ,MEM_POSTINC(res_ptr),d3)
-
- dbf size,Loop
- INSN2(addx,l ,d0,d5)
- INSN2(sub,l ,size,#0x10000)
- bcc Loop
-
- /* Restore used registers from stack frame. */
- INSN2(movem,l ,d2-d5,MEM_POSTINC(sp))
-
- rts
-