| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* More subroutines needed by GCC output code on some machines. */ |
| 2 | /* Compile this one with gcc. */ |
| 3 | /* Copyright (C) 1989, 92-98, 1999 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GNU CC. |
| 6 | |
| 7 | GNU CC is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2, or (at your option) |
| 10 | any later version. |
| 11 | |
| 12 | GNU CC is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with GNU CC; see the file COPYING. If not, write to |
| 19 | the Free Software Foundation, 59 Temple Place - Suite 330, |
| 20 | Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | /* As a special exception, if you link this library with other files, |
| 23 | some of which are compiled with GCC, to produce an executable, |
| 24 | this library does not by itself cause the resulting executable |
| 25 | to be covered by the GNU General Public License. |
| 26 | This exception does not however invalidate any other reasons why |
| 27 | the executable file might be covered by the GNU General Public License. |
| 28 | */ |
| 29 | /* support functions required by the kernel. based on code from gcc-2.95.3 */ |
| 30 | /* I Molton 29/07/01 */ |
| 31 | |
| 32 | #include "gcclib.h" |
| 33 | |
| 34 | #define umul_ppmm(xh, xl, a, b) \ |
| 35 | {register USItype __t0, __t1, __t2; \ |
| 36 | __asm__ ("%@ Inlined umul_ppmm \n\ |
| 37 | mov %2, %5, lsr #16 \n\ |
| 38 | mov %0, %6, lsr #16 \n\ |
| 39 | bic %3, %5, %2, lsl #16 \n\ |
| 40 | bic %4, %6, %0, lsl #16 \n\ |
| 41 | mul %1, %3, %4 \n\ |
| 42 | mul %4, %2, %4 \n\ |
| 43 | mul %3, %0, %3 \n\ |
| 44 | mul %0, %2, %0 \n\ |
| 45 | adds %3, %4, %3 \n\ |
| 46 | addcs %0, %0, #65536 \n\ |
| 47 | adds %1, %1, %3, lsl #16 \n\ |
| 48 | adc %0, %0, %3, lsr #16" \ |
| 49 | : "=&r" ((USItype) (xh)), \ |
| 50 | "=r" ((USItype) (xl)), \ |
| 51 | "=&r" (__t0), "=&r" (__t1), "=r" (__t2) \ |
| 52 | : "r" ((USItype) (a)), \ |
| 53 | "r" ((USItype) (b)));} |
| 54 | |
| 55 | |
| 56 | #define __umulsidi3(u, v) \ |
| 57 | ({DIunion __w; \ |
| 58 | umul_ppmm (__w.s.high, __w.s.low, u, v); \ |
| 59 | __w.ll; }) |
| 60 | |
| 61 | |
| 62 | DItype |
| 63 | __muldi3 (DItype u, DItype v) |
| 64 | { |
| 65 | DIunion w; |
| 66 | DIunion uu, vv; |
| 67 | |
| 68 | uu.ll = u, |
| 69 | vv.ll = v; |
| 70 | |
| 71 | w.ll = __umulsidi3 (uu.s.low, vv.s.low); |
| 72 | w.s.high += ((USItype) uu.s.low * (USItype) vv.s.high |
| 73 | + (USItype) uu.s.high * (USItype) vv.s.low); |
| 74 | |
| 75 | return w.ll; |
| 76 | } |
| 77 | |