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58 lines
1.6 KiB
58 lines
1.6 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/export.h> |
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#include "libgcc.h" |
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#define W_TYPE_SIZE 32 |
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#define __ll_B ((unsigned long) 1 << (W_TYPE_SIZE / 2)) |
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#define __ll_lowpart(t) ((unsigned long) (t) & (__ll_B - 1)) |
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#define __ll_highpart(t) ((unsigned long) (t) >> (W_TYPE_SIZE / 2)) |
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/* If we still don't have umul_ppmm, define it using plain C. */ |
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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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unsigned long __x0, __x1, __x2, __x3; \ |
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unsigned short __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 = (unsigned long) __ul * __vl; \ |
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__x1 = (unsigned long) __ul * __vh; \ |
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__x2 = (unsigned long) __uh * __vl; \ |
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__x3 = (unsigned long) __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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DWunion __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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}) |
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#endif |
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long long __muldi3(long long u, long long v) |
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{ |
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const DWunion uu = {.ll = u}; |
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const DWunion vv = {.ll = v}; |
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DWunion w = {.ll = __umulsidi3(uu.s.low, vv.s.low)}; |
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w.s.high += ((unsigned long) uu.s.low * (unsigned long) vv.s.high |
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+ (unsigned long) uu.s.high * (unsigned long) 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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