1/* ===-- int_math.h - internal math inlines ---------------------------------===
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 is not part of the interface of this library.
11 *
12 * This file defines substitutes for the libm functions used in some of the
13 * compiler-rt implementations, defined in such a way that there is not a direct
14 * dependency on libm or math.h. Instead, we use the compiler builtin versions
15 * where available. This reduces our dependencies on the system SDK by foisting
16 * the responsibility onto the compiler.
17 *
18 * ===-----------------------------------------------------------------------===
19 */
20
21#ifndef INT_MATH_H
22#define INT_MATH_H
23
24#ifndef __has_builtin
25#  define  __has_builtin(x) 0
26#endif
27
28#define CRT_INFINITY __builtin_huge_valf()
29
30#define crt_isinf(x) __builtin_isinf((x))
31#define crt_isnan(x) __builtin_isnan((x))
32
33/* Define crt_isfinite in terms of the builtin if available, otherwise provide
34 * an alternate version in terms of our other functions. This supports some
35 * versions of GCC which didn't have __builtin_isfinite.
36 */
37#if __has_builtin(__builtin_isfinite)
38#  define crt_isfinite(x) __builtin_isfinite((x))
39#else
40#  define crt_isfinite(x) \
41  __extension__(({ \
42      __typeof((x)) x_ = (x); \
43      !crt_isinf(x_) && !crt_isnan(x_); \
44    }))
45#endif
46
47#define crt_copysign(x, y) __builtin_copysign((x), (y))
48#define crt_copysignf(x, y) __builtin_copysignf((x), (y))
49#define crt_copysignl(x, y) __builtin_copysignl((x), (y))
50
51#define crt_fabs(x) __builtin_fabs((x))
52#define crt_fabsf(x) __builtin_fabsf((x))
53#define crt_fabsl(x) __builtin_fabsl((x))
54
55#define crt_fmax(x, y) __builtin_fmax((x), (y))
56#define crt_fmaxf(x, y) __builtin_fmaxf((x), (y))
57#define crt_fmaxl(x, y) __builtin_fmaxl((x), (y))
58
59#define crt_logb(x) __builtin_logb((x))
60#define crt_logbf(x) __builtin_logbf((x))
61#define crt_logbl(x) __builtin_logbl((x))
62
63#define crt_scalbn(x, y) __builtin_scalbn((x), (y))
64#define crt_scalbnf(x, y) __builtin_scalbnf((x), (y))
65#define crt_scalbnl(x, y) __builtin_scalbnl((x), (y))
66
67#endif /* INT_MATH_H */
68