1/* ===-- fixunsdfsi.c - Implement __fixunsdfsi -----------------------------===
2 *
3 *                     The LLVM Compiler Infrastructure
4 *
5 * This file is dual licensed under the MIT and the University of Illinois Open
6 * Source Licenses. See LICENSE.TXT for details.
7 *
8 * ===----------------------------------------------------------------------===
9 *
10 * This file implements __fixunsdfsi for the compiler_rt library.
11 *
12 * ===----------------------------------------------------------------------===
13 */
14
15#include "int_lib.h"
16
17/* Returns: convert a to a unsigned int, rounding toward zero.
18 *          Negative values all become zero.
19 */
20
21/* Assumption: double is a IEEE 64 bit floating point type
22 *             su_int is a 32 bit integral type
23 *             value in double is representable in su_int or is negative
24 *                 (no range checking performed)
25 */
26
27/* seee eeee eeee mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm */
28
29ARM_EABI_FNALIAS(d2uiz, fixunsdfsi)
30
31COMPILER_RT_ABI su_int
32__fixunsdfsi(double a)
33{
34    double_bits fb;
35    fb.f = a;
36    int e = ((fb.u.s.high & 0x7FF00000) >> 20) - 1023;
37    if (e < 0 || (fb.u.s.high & 0x80000000))
38        return 0;
39    return (
40                0x80000000u                      |
41                ((fb.u.s.high & 0x000FFFFF) << 11) |
42                (fb.u.s.low >> 21)
43           ) >> (31 - e);
44}
45