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96 lines
2.6 KiB
96 lines
2.6 KiB
/* muldi3.c extracted from gcc-2.7.2.3/libgcc2.c and |
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gcc-2.7.2.3/longlong.h which is: */ |
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/* Copyright (C) 1989, 1992, 1993, 1994, 1995 Free Software Foundation, Inc. |
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This file is part of GNU CC. |
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GNU CC is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2, or (at your option) |
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any later version. |
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GNU CC is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. */ |
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#include <linux/compiler.h> |
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#include <linux/export.h> |
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#ifdef CONFIG_CPU_HAS_NO_MULDIV64 |
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#define SI_TYPE_SIZE 32 |
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#define __BITS4 (SI_TYPE_SIZE / 4) |
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#define __ll_B (1L << (SI_TYPE_SIZE / 2)) |
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#define __ll_lowpart(t) ((USItype) (t) % __ll_B) |
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#define __ll_highpart(t) ((USItype) (t) / __ll_B) |
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#define umul_ppmm(w1, w0, u, v) \ |
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do { \ |
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USItype __x0, __x1, __x2, __x3; \ |
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USItype __ul, __vl, __uh, __vh; \ |
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\ |
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__ul = __ll_lowpart (u); \ |
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__uh = __ll_highpart (u); \ |
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__vl = __ll_lowpart (v); \ |
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__vh = __ll_highpart (v); \ |
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\ |
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__x0 = (USItype) __ul * __vl; \ |
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__x1 = (USItype) __ul * __vh; \ |
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__x2 = (USItype) __uh * __vl; \ |
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__x3 = (USItype) __uh * __vh; \ |
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\ |
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__x1 += __ll_highpart (__x0);/* this can't give carry */ \ |
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__x1 += __x2; /* but this indeed can */ \ |
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if (__x1 < __x2) /* did we get it? */ \ |
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__x3 += __ll_B; /* yes, add it in the proper pos. */ \ |
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\ |
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(w1) = __x3 + __ll_highpart (__x1); \ |
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(w0) = __ll_lowpart (__x1) * __ll_B + __ll_lowpart (__x0); \ |
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} while (0) |
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#else |
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#define umul_ppmm(w1, w0, u, v) \ |
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__asm__ ("mulu%.l %3,%1:%0" \ |
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: "=d" ((USItype)(w0)), \ |
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"=d" ((USItype)(w1)) \ |
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: "%0" ((USItype)(u)), \ |
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"dmi" ((USItype)(v))) |
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#endif |
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#define __umulsidi3(u, v) \ |
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({DIunion __w; \ |
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umul_ppmm (__w.s.high, __w.s.low, u, v); \ |
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__w.ll; }) |
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typedef int SItype __mode(SI); |
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typedef unsigned int USItype __mode(SI); |
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typedef int DItype __mode(DI); |
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typedef int word_type __mode(__word__); |
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struct DIstruct {SItype high, low;}; |
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typedef union |
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{ |
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struct DIstruct s; |
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DItype ll; |
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} DIunion; |
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DItype |
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__muldi3 (DItype u, DItype v) |
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{ |
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DIunion w; |
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DIunion uu, vv; |
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uu.ll = u, |
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vv.ll = v; |
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w.ll = __umulsidi3 (uu.s.low, vv.s.low); |
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w.s.high += ((USItype) uu.s.low * (USItype) vv.s.high |
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+ (USItype) uu.s.high * (USItype) vv.s.low); |
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return w.ll; |
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} |
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EXPORT_SYMBOL(__muldi3);
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