1*8c80c865SLionel Debieve /* ===-- divdi3.c - Implement __divdi3 -------------------------------------=== 2*8c80c865SLionel Debieve * 3*8c80c865SLionel Debieve * The LLVM Compiler Infrastructure 4*8c80c865SLionel Debieve * 5*8c80c865SLionel Debieve * This file is dual licensed under the MIT and the University of Illinois Open 6*8c80c865SLionel Debieve * Source Licenses. See LICENSE.TXT for details. 7*8c80c865SLionel Debieve * 8*8c80c865SLionel Debieve * ===----------------------------------------------------------------------=== 9*8c80c865SLionel Debieve * 10*8c80c865SLionel Debieve * This file implements __divdi3 for the compiler_rt library. 11*8c80c865SLionel Debieve * 12*8c80c865SLionel Debieve * ===----------------------------------------------------------------------=== 13*8c80c865SLionel Debieve */ 14*8c80c865SLionel Debieve 15*8c80c865SLionel Debieve #include "int_lib.h" 16*8c80c865SLionel Debieve 17*8c80c865SLionel Debieve /* Returns: a / b */ 18*8c80c865SLionel Debieve 19*8c80c865SLionel Debieve COMPILER_RT_ABI di_int 20*8c80c865SLionel Debieve __divdi3(di_int a, di_int b) 21*8c80c865SLionel Debieve { 22*8c80c865SLionel Debieve const int bits_in_dword_m1 = (int)(sizeof(di_int) * CHAR_BIT) - 1; 23*8c80c865SLionel Debieve di_int s_a = a >> bits_in_dword_m1; /* s_a = a < 0 ? -1 : 0 */ 24*8c80c865SLionel Debieve di_int s_b = b >> bits_in_dword_m1; /* s_b = b < 0 ? -1 : 0 */ 25*8c80c865SLionel Debieve a = (a ^ s_a) - s_a; /* negate if s_a == -1 */ 26*8c80c865SLionel Debieve b = (b ^ s_b) - s_b; /* negate if s_b == -1 */ 27*8c80c865SLionel Debieve s_a ^= s_b; /*sign of quotient */ 28*8c80c865SLionel Debieve return (__udivmoddi4(a, b, (du_int*)0) ^ s_a) - s_a; /* negate if s_a == -1 */ 29*8c80c865SLionel Debieve } 30