projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 3b84e62e RM |
1 | /* mc68020 __mpn_submul_1 -- Multiply a limb vector with a limb and subtract |
| 2 | the result from a second limb vector. | |
| 3 | ||
| 4 | Copyright (C) 1992, 1994 Free Software Foundation, Inc. | |
| 5 | ||
| 6 | This file is part of the GNU MP Library. | |
| 7 | ||
| 8 | The GNU MP Library is free software; you can redistribute it and/or modify | |
| 9 | it under the terms of the GNU Library General Public License as published by | |
| 10 | the Free Software Foundation; either version 2 of the License, or (at your | |
| 11 | option) any later version. | |
| 12 | ||
| 13 | The GNU MP Library is distributed in the hope that it will be useful, but | |
| 14 | WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
| 15 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public | |
| 16 | License for more details. | |
| 17 | ||
| 18 | You should have received a copy of the GNU Library General Public License | |
| 19 | along with the GNU MP Library; see the file COPYING.LIB. If not, write to | |
| 20 | the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
| 21 | ||
| 22 | /* | |
| 23 | INPUT PARAMETERS | |
| 24 | res_ptr (sp + 4) | |
| 25 | s1_ptr (sp + 8) | |
| 26 | size (sp + 12) | |
| 27 | s2_limb (sp + 16) | |
| 28 | */ | |
| 29 | ||
| 30 | #include "asm-syntax.h" | |
| 31 | ||
| 32 | TEXT | |
| 33 | ALIGN | |
| 34 | GLOBL ___mpn_submul_1 | |
| 35 | ||
| 36 | LAB(___mpn_submul_1) | |
| 37 | ||
| 38 | #define res_ptr a0 | |
| 39 | #define s1_ptr a1 | |
| 40 | #define size d2 | |
| 41 | #define s2_limb d4 | |
| 42 | ||
| 43 | /* Save used registers on the stack. */ | |
| 44 | INSN2(movem,l ,MEM_PREDEC(sp),d2-d5) | |
| 45 | ||
| 46 | /* Copy the arguments to registers. Better use movem? */ | |
| 47 | INSN2(move,l ,res_ptr,MEM_DISP(sp,20)) | |
| 48 | INSN2(move,l ,s1_ptr,MEM_DISP(sp,24)) | |
| 49 | INSN2(move,l ,size,MEM_DISP(sp,28)) | |
| 50 | INSN2(move,l ,s2_limb,MEM_DISP(sp,32)) | |
| 51 | ||
| 52 | INSN2(eor,w ,size,#1) | |
| 53 | INSN1(clr,l ,d1) | |
| 54 | INSN1(clr,l ,d5) | |
| 55 | INSN2(lsr,l ,size,#1) | |
| 56 | bcc L1 | |
| 57 | INSN2(subq,l ,size,#1) | |
| 58 | INSN2(sub,l ,d0,d0) /* (d0,cy) <= (0,0) */ | |
| 59 | ||
| 60 | LAB(Loop) | |
| 61 | INSN2(move,l ,d3,MEM_POSTINC(s1_ptr)) | |
| 62 | INSN2(mulu,l ,d1:d3,s2_limb) | |
| 63 | INSN2(addx,l ,d3,d0) | |
| 64 | INSN2(addx,l ,d1,d5) | |
| 65 | INSN2(sub,l ,MEM_POSTINC(res_ptr),d3) | |
| 66 | LAB(L1) INSN2(move,l ,d3,MEM_POSTINC(s1_ptr)) | |
| 67 | INSN2(mulu,l ,d0:d3,s2_limb) | |
| 68 | INSN2(addx,l ,d3,d1) | |
| 69 | INSN2(addx,l ,d0,d5) | |
| 70 | INSN2(sub,l ,MEM_POSTINC(res_ptr),d3) | |
| 71 | ||
| 72 | dbf size,Loop | |
| 73 | INSN2(addx,l ,d0,d5) | |
| 74 | INSN2(sub,l ,size,#0x10000) | |
| 75 | bcc Loop | |
| 76 | ||
| 77 | /* Restore used registers from stack frame. */ | |
| 78 | INSN2(movem,l ,d2-d5,MEM_POSTINC(sp)) | |
| 79 | ||
| 80 | rts |