1 /* ===-- divti3.c - Implement __divti3 -------------------------------------=== 2 * 3 * The LLVM Compiler Infrastructure 4 * 5 * This file is distributed under the University of Illinois Open Source 6 * License. See LICENSE.TXT for details. 7 * 8 * ===----------------------------------------------------------------------=== 9 * 10 * This file implements __divti3 for the compiler_rt library. 11 * 12 * ===----------------------------------------------------------------------=== 13 */ 14 15 #if __x86_64 16 17 #include "int_lib.h" 18 19 tu_int __udivmodti4(tu_int a, tu_int b, tu_int* rem); 20 21 /* Returns: a / b */ 22 23 ti_int 24 __divti3(ti_int a, ti_int b) 25 { 26 const int bits_in_tword_m1 = (int)(sizeof(ti_int) * CHAR_BIT) - 1; 27 ti_int s_a = a >> bits_in_tword_m1; /* s_a = a < 0 ? -1 : 0 */ 28 ti_int s_b = b >> bits_in_tword_m1; /* s_b = b < 0 ? -1 : 0 */ 29 a = (a ^ s_a) - s_a; /* negate if s_a == -1 */ 30 b = (b ^ s_b) - s_b; /* negate if s_b == -1 */ 31 s_a ^= s_b; /* sign of quotient */ 32 return (__udivmodti4(a, b, (tu_int*)0) ^ s_a) - s_a; /* negate if s_a == -1 */ 33 } 34 35 #endif 36
