2 * muldi3.c extracted from gcc-2.7.2.3/libgcc2.c and
3 * gcc-2.7.2.3/longlong.h
5 * Copyright (C) 1989, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
7 * SPDX-License-Identifier: GPL-2.0+
10 #define SI_TYPE_SIZE 32
11 #define __BITS4 (SI_TYPE_SIZE / 4)
12 #define __ll_B (1L << (SI_TYPE_SIZE / 2))
13 #define __ll_lowpart(t) ((USItype) (t) % __ll_B)
14 #define __ll_highpart(t) ((USItype) (t) / __ll_B)
16 #define umul_ppmm(w1, w0, u, v) \
18 USItype __x0, __x1, __x2, __x3; \
19 USItype __ul, __vl, __uh, __vh; \
21 __ul = __ll_lowpart (u); \
22 __uh = __ll_highpart (u); \
23 __vl = __ll_lowpart (v); \
24 __vh = __ll_highpart (v); \
26 __x0 = (USItype) __ul * __vl; \
27 __x1 = (USItype) __ul * __vh; \
28 __x2 = (USItype) __uh * __vl; \
29 __x3 = (USItype) __uh * __vh; \
31 __x1 += __ll_highpart (__x0);/* this can't give carry */ \
32 __x1 += __x2; /* but this indeed can */ \
33 if (__x1 < __x2) /* did we get it? */ \
34 __x3 += __ll_B; /* yes, add it in the proper pos. */ \
36 (w1) = __x3 + __ll_highpart (__x1); \
37 (w0) = __ll_lowpart (__x1) * __ll_B + __ll_lowpart (__x0); \
40 #define __umulsidi3(u, v) \
42 umul_ppmm (__w.s.high, __w.s.low, u, v); \
45 typedef int SItype __attribute__ ((mode (SI)));
46 typedef unsigned int USItype __attribute__ ((mode (SI)));
47 typedef int DItype __attribute__ ((mode (DI)));
48 typedef int word_type __attribute__ ((mode (__word__)));
50 struct DIstruct {SItype high, low;};
58 DItype __muldi3 (DItype u, DItype v)
66 w.ll = __umulsidi3 (uu.s.low, vv.s.low);
67 w.s.high += ((USItype) uu.s.low * (USItype) vv.s.high
68 + (USItype) uu.s.high * (USItype) vv.s.low);