| //===-- divti3.c - Implement __divti3 -------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements __divti3 for the compiler_rt library. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #if __x86_64 |
| |
| #include "int_lib.h" |
| |
| tu_int __udivmodti4(tu_int a, tu_int b, tu_int* rem); |
| |
| // Returns: a / b |
| |
| ti_int |
| __divti3(ti_int a, ti_int b) |
| { |
| const int bits_in_tword_m1 = (int)(sizeof(ti_int) * CHAR_BIT) - 1; |
| ti_int s_a = a >> bits_in_tword_m1; // s_a = a < 0 ? -1 : 0 |
| ti_int s_b = b >> bits_in_tword_m1; // s_b = b < 0 ? -1 : 0 |
| a = (a ^ s_a) - s_a; // negate if s_a == -1 |
| b = (b ^ s_b) - s_b; // negate if s_b == -1 |
| s_a ^= s_b; // sign of quotient |
| return (__udivmodti4(a, b, (tu_int*)0) ^ s_a) - s_a; // negate if s_a == -1 |
| } |
| |
| #endif |