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
__muldi3(DWtype u,DWtype v)35 DWtype __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