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6621cb4a2d
This code works, but it is cleaner to use a semicolon at the end of a statement instead of a comma. Extracted from a big anonymous patch by Julia Lawall <julia.lawall@inria.fr>. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Link: https://lore.kernel.org/r/20210914073155.3883532-1-geert@linux-m68k.org
97 lines
2.6 KiB
C
97 lines
2.6 KiB
C
/* 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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