1*0a6a1f1dSLionel Sambuc /* ===-- multi3.c - Implement __multi3 -------------------------------------=== 2*0a6a1f1dSLionel Sambuc * 3*0a6a1f1dSLionel Sambuc * The LLVM Compiler Infrastructure 4*0a6a1f1dSLionel Sambuc * 5*0a6a1f1dSLionel Sambuc * This file is dual licensed under the MIT and the University of Illinois Open 6*0a6a1f1dSLionel Sambuc * Source Licenses. See LICENSE.TXT for details. 7*0a6a1f1dSLionel Sambuc * 8*0a6a1f1dSLionel Sambuc * ===----------------------------------------------------------------------=== 9*0a6a1f1dSLionel Sambuc 10*0a6a1f1dSLionel Sambuc * This file implements __multi3 for the compiler_rt library. 11*0a6a1f1dSLionel Sambuc * 12*0a6a1f1dSLionel Sambuc * ===----------------------------------------------------------------------=== 13*0a6a1f1dSLionel Sambuc */ 14*0a6a1f1dSLionel Sambuc 15*0a6a1f1dSLionel Sambuc #include "int_lib.h" 16*0a6a1f1dSLionel Sambuc 17*0a6a1f1dSLionel Sambuc #ifdef CRT_HAS_128BIT 18*0a6a1f1dSLionel Sambuc 19*0a6a1f1dSLionel Sambuc /* Returns: a * b */ 20*0a6a1f1dSLionel Sambuc 21*0a6a1f1dSLionel Sambuc static 22*0a6a1f1dSLionel Sambuc ti_int __mulddi3(du_int a,du_int b)23*0a6a1f1dSLionel Sambuc__mulddi3(du_int a, du_int b) 24*0a6a1f1dSLionel Sambuc { 25*0a6a1f1dSLionel Sambuc twords r; 26*0a6a1f1dSLionel Sambuc const int bits_in_dword_2 = (int)(sizeof(di_int) * CHAR_BIT) / 2; 27*0a6a1f1dSLionel Sambuc const du_int lower_mask = (du_int)~0 >> bits_in_dword_2; 28*0a6a1f1dSLionel Sambuc r.s.low = (a & lower_mask) * (b & lower_mask); 29*0a6a1f1dSLionel Sambuc du_int t = r.s.low >> bits_in_dword_2; 30*0a6a1f1dSLionel Sambuc r.s.low &= lower_mask; 31*0a6a1f1dSLionel Sambuc t += (a >> bits_in_dword_2) * (b & lower_mask); 32*0a6a1f1dSLionel Sambuc r.s.low += (t & lower_mask) << bits_in_dword_2; 33*0a6a1f1dSLionel Sambuc r.s.high = t >> bits_in_dword_2; 34*0a6a1f1dSLionel Sambuc t = r.s.low >> bits_in_dword_2; 35*0a6a1f1dSLionel Sambuc r.s.low &= lower_mask; 36*0a6a1f1dSLionel Sambuc t += (b >> bits_in_dword_2) * (a & lower_mask); 37*0a6a1f1dSLionel Sambuc r.s.low += (t & lower_mask) << bits_in_dword_2; 38*0a6a1f1dSLionel Sambuc r.s.high += t >> bits_in_dword_2; 39*0a6a1f1dSLionel Sambuc r.s.high += (a >> bits_in_dword_2) * (b >> bits_in_dword_2); 40*0a6a1f1dSLionel Sambuc return r.all; 41*0a6a1f1dSLionel Sambuc } 42*0a6a1f1dSLionel Sambuc 43*0a6a1f1dSLionel Sambuc /* Returns: a * b */ 44*0a6a1f1dSLionel Sambuc 45*0a6a1f1dSLionel Sambuc COMPILER_RT_ABI ti_int __multi3(ti_int a,ti_int b)46*0a6a1f1dSLionel Sambuc__multi3(ti_int a, ti_int b) 47*0a6a1f1dSLionel Sambuc { 48*0a6a1f1dSLionel Sambuc twords x; 49*0a6a1f1dSLionel Sambuc x.all = a; 50*0a6a1f1dSLionel Sambuc twords y; 51*0a6a1f1dSLionel Sambuc y.all = b; 52*0a6a1f1dSLionel Sambuc twords r; 53*0a6a1f1dSLionel Sambuc r.all = __mulddi3(x.s.low, y.s.low); 54*0a6a1f1dSLionel Sambuc r.s.high += x.s.high * y.s.low + x.s.low * y.s.high; 55*0a6a1f1dSLionel Sambuc return r.all; 56*0a6a1f1dSLionel Sambuc } 57*0a6a1f1dSLionel Sambuc 58*0a6a1f1dSLionel Sambuc #endif /* CRT_HAS_128BIT */ 59