lib/absvdi2.c

//===-- absvdi2.c - Implement __absvdi2 -----------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements __absvdi2 for the compiler_rt library.
//
//===----------------------------------------------------------------------===//

#include "int_lib.h"
#include <stdlib.h>

// Returns: absolute value

// Effects: aborts if abs(x) < 0

di_int
__absvdi2(di_int a)
{
    const int N = (int)(sizeof(di_int) * CHAR_BIT);
    if (a == ((di_int)1 << (N-1)))
        abort();
    const di_int t = a >> (N - 1);
    return (a ^ t) - t;
}