1// SPDX-License-Identifier: GPL-2.0 2#include "libgcc.h" 3 4#define __ll_B ((UWtype) 1 << (W_TYPE_SIZE / 2)) 5#define __ll_lowpart(t) ((UWtype) (t) & (__ll_B - 1)) 6#define __ll_highpart(t) ((UWtype) (t) >> (W_TYPE_SIZE / 2)) 7 8#define umul_ppmm(w1, w0, u, v) \ 9 do { \ 10 UWtype __x0, __x1, __x2, __x3; \ 11 UHWtype __ul, __vl, __uh, __vh; \ 12 __ul = __ll_lowpart(u); \ 13 __uh = __ll_highpart(u); \ 14 __vl = __ll_lowpart(v); \ 15 __vh = __ll_highpart(v); \ 16 __x0 = (UWtype) __ul * __vl; \ 17 __x1 = (UWtype) __ul * __vh; \ 18 __x2 = (UWtype) __uh * __vl; \ 19 __x3 = (UWtype) __uh * __vh; \ 20 __x1 += __ll_highpart(__x0); \ 21 __x1 += __x2; \ 22 if (__x1 < __x2) \ 23 __x3 += __ll_B; \ 24 (w1) = __x3 + __ll_highpart(__x1); \ 25 (w0) = __ll_lowpart(__x1) * __ll_B + __ll_lowpart(__x0); \ 26 } while (0) 27 28#define __umulsidi3(u, v) ( \ 29 { \ 30 DWunion __w; \ 31 umul_ppmm(__w.s.high, __w.s.low, u, v); \ 32 __w.ll; } \ 33 ) 34 35DWtype __muldi3(DWtype u, DWtype v) 36{ 37 const DWunion uu = {.ll = u}; 38 const DWunion vv = {.ll = v}; 39 DWunion w = {.ll = __umulsidi3(uu.s.low, vv.s.low)}; 40 41 w.s.high += ((UWtype) uu.s.low * (UWtype) vv.s.high 42 + (UWtype) uu.s.high * (UWtype) vv.s.low); 43 44 return w.ll; 45} 46