1214152Sed/* ===-- fixdfdi.c - Implement __fixdfdi -----------------------------------===
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 __fixdfdi for the compiler_rt library.
11214152Sed *
12214152Sed * ===----------------------------------------------------------------------===
13214152Sed */
14214152Sed
15214152Sed#include "int_lib.h"
16214152Sed
17214152Sed/* Returns: convert a to a signed long long, rounding toward zero. */
18214152Sed
19214152Sed/* Assumption: double is a IEEE 64 bit floating point type
20214152Sed *            su_int is a 32 bit integral type
21214152Sed *            value in double is representable in di_int (no range checking performed)
22214152Sed */
23214152Sed
24214152Sed/* seee eeee eeee mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm */
25214152Sed
26263560SdimARM_EABI_FNALIAS(d2lz, fixdfdi)
27222656Sed
28214152Seddi_int
29214152Sed__fixdfdi(double a)
30214152Sed{
31214152Sed    double_bits fb;
32214152Sed    fb.f = a;
33214152Sed    int e = ((fb.u.s.high & 0x7FF00000) >> 20) - 1023;
34214152Sed    if (e < 0)
35214152Sed        return 0;
36214152Sed    di_int s = (si_int)(fb.u.s.high & 0x80000000) >> 31;
37214152Sed    dwords r;
38214152Sed    r.s.high = (fb.u.s.high & 0x000FFFFF) | 0x00100000;
39214152Sed    r.s.low = fb.u.s.low;
40214152Sed    if (e > 52)
41214152Sed        r.all <<= (e - 52);
42214152Sed    else
43214152Sed        r.all >>= (52 - e);
44214152Sed    return (r.all ^ s) - s;
45214152Sed}
46