//===-- divsi3.c - Implement __divsi3 -------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements __divsi3 for the compiler_rt library.
//
//===----------------------------------------------------------------------===//

#include "int_lib.h"

su_int __udivsi3(su_int n, su_int d);

// Returns: a / b

si_int
__divsi3(si_int a, si_int b)
{
    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 = (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 (__udivsi3(a, b) ^ s_a) - s_a;        // negate if s_a == -1
}