74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* U-Boot - muldi3.c contains routines for mult and div
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*
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*/
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/* Generic function got from GNU gcc package, libgcc2.c */
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#ifndef SI_TYPE_SIZE
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#define SI_TYPE_SIZE 32
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#endif
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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 BITS_PER_UNIT 8
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#if !defined(umul_ppmm)
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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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#endif
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#if !defined(__umulsidi3)
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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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#endif
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typedef unsigned int USItype __attribute__ ((mode(SI)));
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typedef int SItype __attribute__ ((mode(SI)));
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typedef int DItype __attribute__ ((mode(DI)));
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typedef int word_type __attribute__ ((mode(__word__)));
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struct DIstruct {
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SItype low, high;
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};
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typedef union {
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struct DIstruct s;
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DItype ll;
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} DIunion;
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DItype __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, vv.ll = v;
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/* panic("kernel panic for __muldi3"); */
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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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