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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061// SPDX-License-Identifier: GPL-2.0-or-later/* */
#include <linux/export.h>#include <linux/libgcc.h>
#define W_TYPE_SIZE 32
#define __ll_B ((unsigned long) 1 << (W_TYPE_SIZE / 2))#define __ll_lowpart(t) ((unsigned long) (t) & (__ll_B - 1))#define __ll_highpart(t) ((unsigned long) (t) >> (W_TYPE_SIZE / 2))
/* If we still don't have umul_ppmm, define it using plain C. */#if !defined(umul_ppmm)#define umul_ppmm(w1, w0, u, v) \ do { \ unsigned long __x0, __x1, __x2, __x3; \ unsigned short __ul, __vl, __uh, __vh; \ \ __ul = __ll_lowpart(u); \ __uh = __ll_highpart(u); \ __vl = __ll_lowpart(v); \ __vh = __ll_highpart(v); \ \ __x0 = (unsigned long) __ul * __vl; \ __x1 = (unsigned long) __ul * __vh; \ __x2 = (unsigned long) __uh * __vl; \ __x3 = (unsigned long) __uh * __vh; \ \ __x1 += __ll_highpart(__x0); /* this can't give carry */\ __x1 += __x2; /* but this indeed can */ \ if (__x1 < __x2) /* did we get it? */ \ __x3 += __ll_B; /* yes, add it in the proper pos */ \ \ (w1) = __x3 + __ll_highpart(__x1); \ (w0) = __ll_lowpart(__x1) * __ll_B + __ll_lowpart(__x0);\ } while (0)#endif
#if !defined(__umulsidi3)#define __umulsidi3(u, v) ({ \ DWunion __w; \ umul_ppmm(__w.s.high, __w.s.low, u, v); \ __w.ll; \ })#endif
long long notrace __muldi3(long long u, long long v){ const DWunion uu = {.ll = u}; const DWunion vv = {.ll = v}; DWunion w = {.ll = __umulsidi3(uu.s.low, vv.s.low)};
w.s.high += ((unsigned long) uu.s.low * (unsigned long) vv.s.high + (unsigned long) uu.s.high * (unsigned long) vv.s.low);
return w.ll;}EXPORT_SYMBOL(__muldi3);