| /* ===-- divti3.c - Implement __divti3 -------------------------------------=== |
| * |
| * The LLVM Compiler Infrastructure |
| * |
| * This file is dual licensed under the MIT and the University of Illinois Open |
| * Source Licenses. See LICENSE.TXT for details. |
| * |
| * ===----------------------------------------------------------------------=== |
| * |
| * This file implements __divti3 for the compiler_rt library. |
| * |
| * ===----------------------------------------------------------------------=== |
| */ |
| |
| #include "int_lib.h" |
| |
| #ifdef CRT_HAS_128BIT |
| |
| /* Returns: a / b */ |
| |
| COMPILER_RT_ABI 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 /* CRT_HAS_128BIT */ |
