diff options
Diffstat (limited to 'sysdeps/m68k/m68020/submul_1.S')
| -rw-r--r-- | sysdeps/m68k/m68020/submul_1.S | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/sysdeps/m68k/m68020/submul_1.S b/sysdeps/m68k/m68020/submul_1.S new file mode 100644 index 0000000000..ef7f39de7a --- /dev/null +++ b/sysdeps/m68k/m68020/submul_1.S @@ -0,0 +1,80 @@ +/* mc68020 __mpn_submul_1 -- Multiply a limb vector with a limb and subtract + the result from 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_submul_1 + +LAB(___mpn_submul_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(sub,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(sub,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 |