1/* ===-- fixunssfdi.c - Implement __fixunssfdi -----------------------------===
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 __fixunssfdi for the compiler_rt library.
11 *
12 * ===----------------------------------------------------------------------===
13 */
14
15#include "int_lib.h"
16/* Returns: convert a to a unsigned long long, rounding toward zero.
17 *          Negative values all become zero.
18 */
19
20/* Assumption: float is a IEEE 32 bit floating point type
21 *             du_int is a 64 bit integral type
22 *             value in float is representable in du_int or is negative
23 *                 (no range checking performed)
24 */
25
26/* seee eeee emmm mmmm mmmm mmmm mmmm mmmm */
27
28ARM_EABI_FNALIAS(f2ulz, fixunssfdi)
29
30COMPILER_RT_ABI du_int
31__fixunssfdi(float a)
32{
33    float_bits fb;
34    fb.f = a;
35    int e = ((fb.u & 0x7F800000) >> 23) - 127;
36    if (e < 0 || (fb.u & 0x80000000))
37        return 0;
38    du_int r = (fb.u & 0x007FFFFF) | 0x00800000;
39    if (e > 23)
40        r <<= (e - 23);
41    else
42        r >>= (23 - e);
43    return r;
44}
45