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1a4d82fc JJ |
1 | /* ===-- fixunsxfsi.c - Implement __fixunsxfsi -----------------------------=== |
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 __fixunsxfsi for the compiler_rt library. | |
11 | * | |
12 | * ===----------------------------------------------------------------------=== | |
13 | */ | |
14 | ||
15 | #if !_ARCH_PPC | |
16 | ||
17 | #include "int_lib.h" | |
18 | ||
19 | /* Returns: convert a to a unsigned int, rounding toward zero. | |
20 | * Negative values all become zero. | |
21 | */ | |
22 | ||
23 | /* Assumption: long double is an intel 80 bit floating point type padded with 6 bytes | |
24 | * su_int is a 32 bit integral type | |
25 | * value in long double is representable in su_int or is negative | |
1a4d82fc JJ |
26 | */ |
27 | ||
28 | /* gggg gggg gggg gggg gggg gggg gggg gggg | gggg gggg gggg gggg seee eeee eeee eeee | | |
29 | * 1mmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | |
30 | */ | |
31 | ||
32 | COMPILER_RT_ABI su_int | |
33 | __fixunsxfsi(long double a) | |
34 | { | |
35 | long_double_bits fb; | |
36 | fb.f = a; | |
37 | int e = (fb.u.high.s.low & 0x00007FFF) - 16383; | |
38 | if (e < 0 || (fb.u.high.s.low & 0x00008000)) | |
39 | return 0; | |
92a42be0 SL |
40 | if ((unsigned)e > sizeof(su_int) * CHAR_BIT) |
41 | return ~(su_int)0; | |
1a4d82fc JJ |
42 | return fb.u.low.s.high >> (31 - e); |
43 | } | |
44 | ||
45 | #endif /* !_ARCH_PPC */ |