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1a4d82fc JJ |
1 | /* ===-- fixxfdi.c - Implement __fixxfdi -----------------------------------=== |
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 __fixxfdi 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 signed long long, rounding toward zero. */ | |
20 | ||
21 | /* Assumption: long double is an intel 80 bit floating point type padded with 6 bytes | |
92a42be0 | 22 | * di_int is a 64 bit integral type |
1a4d82fc JJ |
23 | * value in long double is representable in di_int (no range checking performed) |
24 | */ | |
25 | ||
26 | /* gggg gggg gggg gggg gggg gggg gggg gggg | gggg gggg gggg gggg seee eeee eeee eeee | | |
27 | * 1mmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | |
28 | */ | |
29 | ||
30 | COMPILER_RT_ABI di_int | |
31 | __fixxfdi(long double a) | |
32 | { | |
92a42be0 SL |
33 | const di_int di_max = (di_int)((~(du_int)0) / 2); |
34 | const di_int di_min = -di_max - 1; | |
1a4d82fc JJ |
35 | long_double_bits fb; |
36 | fb.f = a; | |
37 | int e = (fb.u.high.s.low & 0x00007FFF) - 16383; | |
38 | if (e < 0) | |
39 | return 0; | |
92a42be0 SL |
40 | if ((unsigned)e >= sizeof(di_int) * CHAR_BIT) |
41 | return a > 0 ? di_max : di_min; | |
1a4d82fc JJ |
42 | di_int s = -(si_int)((fb.u.high.s.low & 0x00008000) >> 15); |
43 | di_int r = fb.u.low.all; | |
44 | r = (du_int)r >> (63 - e); | |
45 | return (r ^ s) - s; | |
46 | } | |
47 | ||
48 | #endif /* !_ARCH_PPC */ |