1*0b57cec5SDimitry Andric //===-- muldi3.c - Implement __muldi3 -------------------------------------===// 2*0b57cec5SDimitry Andric // 3*0b57cec5SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*0b57cec5SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 5*0b57cec5SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*0b57cec5SDimitry Andric // 7*0b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 8*0b57cec5SDimitry Andric // 9*0b57cec5SDimitry Andric // This file implements __muldi3 for the compiler_rt library. 10*0b57cec5SDimitry Andric // 11*0b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 12*0b57cec5SDimitry Andric 13*0b57cec5SDimitry Andric #include "int_lib.h" 14*0b57cec5SDimitry Andric 15*0b57cec5SDimitry Andric // Returns: a * b 16*0b57cec5SDimitry Andric __muldsi3(su_int a,su_int b)17*0b57cec5SDimitry Andricstatic di_int __muldsi3(su_int a, su_int b) { 18*0b57cec5SDimitry Andric dwords r; 19*0b57cec5SDimitry Andric const int bits_in_word_2 = (int)(sizeof(si_int) * CHAR_BIT) / 2; 20*0b57cec5SDimitry Andric const su_int lower_mask = (su_int)~0 >> bits_in_word_2; 21*0b57cec5SDimitry Andric r.s.low = (a & lower_mask) * (b & lower_mask); 22*0b57cec5SDimitry Andric su_int t = r.s.low >> bits_in_word_2; 23*0b57cec5SDimitry Andric r.s.low &= lower_mask; 24*0b57cec5SDimitry Andric t += (a >> bits_in_word_2) * (b & lower_mask); 25*0b57cec5SDimitry Andric r.s.low += (t & lower_mask) << bits_in_word_2; 26*0b57cec5SDimitry Andric r.s.high = t >> bits_in_word_2; 27*0b57cec5SDimitry Andric t = r.s.low >> bits_in_word_2; 28*0b57cec5SDimitry Andric r.s.low &= lower_mask; 29*0b57cec5SDimitry Andric t += (b >> bits_in_word_2) * (a & lower_mask); 30*0b57cec5SDimitry Andric r.s.low += (t & lower_mask) << bits_in_word_2; 31*0b57cec5SDimitry Andric r.s.high += t >> bits_in_word_2; 32*0b57cec5SDimitry Andric r.s.high += (a >> bits_in_word_2) * (b >> bits_in_word_2); 33*0b57cec5SDimitry Andric return r.all; 34*0b57cec5SDimitry Andric } 35*0b57cec5SDimitry Andric 36*0b57cec5SDimitry Andric // Returns: a * b 37*0b57cec5SDimitry Andric __muldi3(di_int a,di_int b)38*0b57cec5SDimitry AndricCOMPILER_RT_ABI di_int __muldi3(di_int a, di_int b) { 39*0b57cec5SDimitry Andric dwords x; 40*0b57cec5SDimitry Andric x.all = a; 41*0b57cec5SDimitry Andric dwords y; 42*0b57cec5SDimitry Andric y.all = b; 43*0b57cec5SDimitry Andric dwords r; 44*0b57cec5SDimitry Andric r.all = __muldsi3(x.s.low, y.s.low); 45*0b57cec5SDimitry Andric r.s.high += x.s.high * y.s.low + x.s.low * y.s.high; 46*0b57cec5SDimitry Andric return r.all; 47*0b57cec5SDimitry Andric } 48*0b57cec5SDimitry Andric 49*0b57cec5SDimitry Andric #if defined(__ARM_EABI__) 50*0b57cec5SDimitry Andric COMPILER_RT_ALIAS(__muldi3, __aeabi_lmul) 51*0b57cec5SDimitry Andric #endif 52