blob: 193f81053568cd20e4f064b637da4e05cb2ef2d8 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
|
//===-- divmodsi4.c - Implement __divmodsi4
//--------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements __divmodsi4 for the compiler_rt library.
//
//===----------------------------------------------------------------------===//
#include "int_lib.h"
// Returns: a / b, *rem = a % b
COMPILER_RT_ABI si_int __divmodsi4(si_int a, si_int b, si_int *rem) {
const int bits_in_word_m1 = (int)(sizeof(si_int) * CHAR_BIT) - 1;
si_int s_a = a >> bits_in_word_m1; // s_a = a < 0 ? -1 : 0
si_int s_b = b >> bits_in_word_m1; // s_b = b < 0 ? -1 : 0
a = (su_int)(a ^ s_a) - s_a; // negate if s_a == -1
b = (su_int)(b ^ s_b) - s_b; // negate if s_b == -1
s_b ^= s_a; // sign of quotient
su_int r;
si_int q = (__udivmodsi4(a, b, &r) ^ s_b) - s_b; // negate if s_b == -1
*rem = (r ^ s_a) - s_a; // negate if s_a == -1
return q;
}
|
