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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /sysdeps/m68k/m68020/mul_1.S
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+/* mc68020 __mpn_mul_1 -- Multiply a limb vector with a limb and store
+ the result in 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_mul_1
+
+LAB(___mpn_mul_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-d4)
+#if 0
+ INSN2(move,l ,MEM_PREDEC(sp),d2)
+ INSN2(move,l ,MEM_PREDEC(sp),d3)
+ INSN2(move,l ,MEM_PREDEC(sp),d4)
+#endif
+
+/* Copy the arguments to registers. Better use movem? */
+ INSN2(move,l ,res_ptr,MEM_DISP(sp,16))
+ INSN2(move,l ,s1_ptr,MEM_DISP(sp,20))
+ INSN2(move,l ,size,MEM_DISP(sp,24))
+ INSN2(move,l ,s2_limb,MEM_DISP(sp,28))
+
+ INSN2(eor,w ,size,#1)
+ INSN1(clr,l ,d1)
+ 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(move,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(move,l ,MEM_POSTINC(res_ptr),d3)
+
+ dbf size,Loop
+ INSN1(clr,l ,d3)
+ INSN2(addx,l ,d0,d3)
+ INSN2(sub,l ,size,#0x10000)
+ bcc Loop
+
+/* Restore used registers from stack frame. */
+ INSN2(movem,l ,d2-d4,MEM_POSTINC(sp))
+#if 0
+ INSN2(move,l ,d4,MEM_POSTINC(sp))
+ INSN2(move,l ,d3,MEM_POSTINC(sp))
+ INSN2(move,l ,d2,MEM_POSTINC(sp))
+#endif
+ rts