81 lines
2.1 KiB
ArmAsm
81 lines
2.1 KiB
ArmAsm
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/* mc68020 __mpn_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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Copyright (C) 1992, 1994 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Library General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
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License for more details.
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You should have received a copy of the GNU Library General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/*
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INPUT PARAMETERS
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res_ptr (sp + 4)
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s1_ptr (sp + 8)
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size (sp + 12)
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s2_limb (sp + 16)
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*/
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#include "asm-syntax.h"
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TEXT
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ALIGN
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GLOBL ___mpn_submul_1
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LAB(___mpn_submul_1)
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#define res_ptr a0
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#define s1_ptr a1
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#define size d2
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#define s2_limb d4
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/* Save used registers on the stack. */
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INSN2(movem,l ,MEM_PREDEC(sp),d2-d5)
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/* Copy the arguments to registers. Better use movem? */
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INSN2(move,l ,res_ptr,MEM_DISP(sp,20))
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INSN2(move,l ,s1_ptr,MEM_DISP(sp,24))
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INSN2(move,l ,size,MEM_DISP(sp,28))
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INSN2(move,l ,s2_limb,MEM_DISP(sp,32))
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INSN2(eor,w ,size,#1)
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INSN1(clr,l ,d1)
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INSN1(clr,l ,d5)
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INSN2(lsr,l ,size,#1)
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bcc L1
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INSN2(subq,l ,size,#1)
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INSN2(sub,l ,d0,d0) /* (d0,cy) <= (0,0) */
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LAB(Loop)
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INSN2(move,l ,d3,MEM_POSTINC(s1_ptr))
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INSN2(mulu,l ,d1:d3,s2_limb)
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INSN2(addx,l ,d3,d0)
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INSN2(addx,l ,d1,d5)
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INSN2(sub,l ,MEM_POSTINC(res_ptr),d3)
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LAB(L1) INSN2(move,l ,d3,MEM_POSTINC(s1_ptr))
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INSN2(mulu,l ,d0:d3,s2_limb)
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INSN2(addx,l ,d3,d1)
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INSN2(addx,l ,d0,d5)
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INSN2(sub,l ,MEM_POSTINC(res_ptr),d3)
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dbf size,Loop
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INSN2(addx,l ,d0,d5)
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INSN2(sub,l ,size,#0x10000)
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bcc Loop
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/* Restore used registers from stack frame. */
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INSN2(movem,l ,d2-d5,MEM_POSTINC(sp))
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rts
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