1214152Sed/* ===-- fixunsxfsi.c - Implement __fixunsxfsi -----------------------------===
2214152Sed *
3214152Sed *                     The LLVM Compiler Infrastructure
4214152Sed *
5222656Sed * This file is dual licensed under the MIT and the University of Illinois Open
6222656Sed * Source Licenses. See LICENSE.TXT for details.
7214152Sed *
8214152Sed * ===----------------------------------------------------------------------===
9214152Sed *
10214152Sed * This file implements __fixunsxfsi for the compiler_rt library.
11214152Sed *
12214152Sed * ===----------------------------------------------------------------------===
13214152Sed */
14214152Sed
15214152Sed#if !_ARCH_PPC
16214152Sed
17214152Sed#include "int_lib.h"
18214152Sed
19214152Sed/* Returns: convert a to a unsigned int, rounding toward zero.
20214152Sed *          Negative values all become zero.
21214152Sed */
22214152Sed
23214152Sed/* Assumption: long double is an intel 80 bit floating point type padded with 6 bytes
24214152Sed *             su_int is a 32 bit integral type
25214152Sed *             value in long double is representable in su_int or is negative
26214152Sed *                 (no range checking performed)
27214152Sed */
28214152Sed
29214152Sed/* gggg gggg gggg gggg gggg gggg gggg gggg | gggg gggg gggg gggg seee eeee eeee eeee |
30214152Sed * 1mmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm
31214152Sed */
32214152Sed
33214152Sedsu_int
34214152Sed__fixunsxfsi(long double a)
35214152Sed{
36214152Sed    long_double_bits fb;
37214152Sed    fb.f = a;
38214152Sed    int e = (fb.u.high.s.low & 0x00007FFF) - 16383;
39214152Sed    if (e < 0 || (fb.u.high.s.low & 0x00008000))
40214152Sed        return 0;
41214152Sed    return fb.u.low.s.high >> (31 - e);
42214152Sed}
43214152Sed
44214152Sed#endif /* !_ARCH_PPC */
45