1*0a6a1f1dSLionel Sambuc /* ===-- divdi3.c - Implement __divdi3 -------------------------------------=== 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 __divdi3 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 /* Returns: a / b */ 18*0a6a1f1dSLionel Sambuc 19*0a6a1f1dSLionel Sambuc COMPILER_RT_ABI di_int __divdi3(di_int a,di_int b)20*0a6a1f1dSLionel Sambuc__divdi3(di_int a, di_int b) 21*0a6a1f1dSLionel Sambuc { 22*0a6a1f1dSLionel Sambuc const int bits_in_dword_m1 = (int)(sizeof(di_int) * CHAR_BIT) - 1; 23*0a6a1f1dSLionel Sambuc di_int s_a = a >> bits_in_dword_m1; /* s_a = a < 0 ? -1 : 0 */ 24*0a6a1f1dSLionel Sambuc di_int s_b = b >> bits_in_dword_m1; /* s_b = b < 0 ? -1 : 0 */ 25*0a6a1f1dSLionel Sambuc a = (a ^ s_a) - s_a; /* negate if s_a == -1 */ 26*0a6a1f1dSLionel Sambuc b = (b ^ s_b) - s_b; /* negate if s_b == -1 */ 27*0a6a1f1dSLionel Sambuc s_a ^= s_b; /*sign of quotient */ 28*0a6a1f1dSLionel Sambuc return (__udivmoddi4(a, b, (du_int*)0) ^ s_a) - s_a; /* negate if s_a == -1 */ 29*0a6a1f1dSLionel Sambuc } 30