1/* ===-- fixunssfti.c - Implement __fixunssfti -----------------------------===
2 *
3 *                     The LLVM Compiler Infrastructure
4 *
5 * This file is distributed under the University of Illinois Open Source
6 * License. See LICENSE.TXT for details.
7 *
8 * ===----------------------------------------------------------------------===
9 *
10 * This file implements __fixunssfti for the compiler_rt library.
11 *
12 * ===----------------------------------------------------------------------===
13 */
14
15#if __x86_64
16
17#include "int_lib.h"
18
19/* Returns: convert a to a unsigned long long, rounding toward zero.
20 *          Negative values all become zero.
21 */
22
23/* Assumption: float is a IEEE 32 bit floating point type
24 *             tu_int is a 64 bit integral type
25 *             value in float is representable in tu_int or is negative
26 *                 (no range checking performed)
27 */
28
29/* seee eeee emmm mmmm mmmm mmmm mmmm mmmm */
30
31tu_int
32__fixunssfti(float a)
33{
34    float_bits fb;
35    fb.f = a;
36    int e = ((fb.u & 0x7F800000) >> 23) - 127;
37    if (e < 0 || (fb.u & 0x80000000))
38        return 0;
39    tu_int r = (fb.u & 0x007FFFFF) | 0x00800000;
40    if (e > 23)
41        r <<= (e - 23);
42    else
43        r >>= (23 - e);
44    return r;
45}
46
47#endif
48