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74 lines
1.9 KiB
74 lines
1.9 KiB
// 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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