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