1 /* ===-- fixunssfdi.c - Implement __fixunssfdi -----------------------------===
2 *
3 * The LLVM Compiler Infrastructure
4 *
5 * This file is dual licensed under the MIT and the University of Illinois Open
6 * Source Licenses. 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 /* Returns: convert a to a unsigned long long, rounding toward zero.
17 * Negative values all become zero.
18 */
19
20 /* Assumption: float is a IEEE 32 bit floating point type
21 * du_int is a 64 bit integral type
22 * value in float is representable in du_int or is negative
23 * (no range checking performed)
24 */
25
26 /* seee eeee emmm mmmm mmmm mmmm mmmm mmmm */
27
ARM_EABI_FNALIAS(f2ulz,fixunssfdi)28 ARM_EABI_FNALIAS(f2ulz, fixunssfdi)
29
30 COMPILER_RT_ABI du_int
31 __fixunssfdi(float a)
32 {
33 float_bits fb;
34 fb.f = a;
35 int e = ((fb.u & 0x7F800000) >> 23) - 127;
36 if (e < 0 || (fb.u & 0x80000000))
37 return 0;
38 du_int r = (fb.u & 0x007FFFFF) | 0x00800000;
39 if (e > 23)
40 r <<= (e - 23);
41 else
42 r >>= (23 - e);
43 return r;
44 }
45