/* * muldi3.c extracted from gcc-2.7.2.3/libgcc2.c and * gcc-2.7.2.3/longlong.h * * Copyright (C) 1989, 1992, 1993, 1994, 1995 Free Software Foundation, Inc. * * SPDX-License-Identifier: GPL-2.0+ */ #define SI_TYPE_SIZE 32 #define __BITS4 (SI_TYPE_SIZE / 4) #define __ll_B (1L << (SI_TYPE_SIZE / 2)) #define __ll_lowpart(t) ((USItype) (t) % __ll_B) #define __ll_highpart(t) ((USItype) (t) / __ll_B) #define umul_ppmm(w1, w0, u, v) \ do { \ USItype __x0, __x1, __x2, __x3; \ USItype __ul, __vl, __uh, __vh; \ \ __ul = __ll_lowpart (u); \ __uh = __ll_highpart (u); \ __vl = __ll_lowpart (v); \ __vh = __ll_highpart (v); \ \ __x0 = (USItype) __ul * __vl; \ __x1 = (USItype) __ul * __vh; \ __x2 = (USItype) __uh * __vl; \ __x3 = (USItype) __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) #define __umulsidi3(u, v) \ ({DIunion __w; \ umul_ppmm (__w.s.high, __w.s.low, u, v); \ __w.ll; }) typedef int SItype __attribute__ ((mode (SI))); typedef unsigned int USItype __attribute__ ((mode (SI))); typedef int DItype __attribute__ ((mode (DI))); typedef int word_type __attribute__ ((mode (__word__))); struct DIstruct {SItype high, low;}; typedef union { struct DIstruct s; DItype ll; } DIunion; DItype __muldi3 (DItype u, DItype v) { DIunion w; DIunion uu, vv; uu.ll = u, vv.ll = v; w.ll = __umulsidi3 (uu.s.low, vv.s.low); w.s.high += ((USItype) uu.s.low * (USItype) vv.s.high + (USItype) uu.s.high * (USItype) vv.s.low); return w.ll; }