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