1//===-- int_math.h - internal math inlines --------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file is not part of the interface of this library.
10//
11// This file defines substitutes for the libm functions used in some of the
12// compiler-rt implementations, defined in such a way that there is not a direct
13// dependency on libm or math.h. Instead, we use the compiler builtin versions
14// where available. This reduces our dependencies on the system SDK by foisting
15// the responsibility onto the compiler.
16//
17//===----------------------------------------------------------------------===//
18
19#ifndef INT_MATH_H
20#define INT_MATH_H
21
22#ifndef __has_builtin
23#define __has_builtin(x) 0
24#endif
25
26#if defined(_MSC_VER) && !defined(__clang__)
27#include <math.h>
28#include <stdlib.h>
29#endif
30
31#if defined(_MSC_VER) && !defined(__clang__)
32#define CRT_INFINITY INFINITY
33#else
34#define CRT_INFINITY __builtin_huge_valf()
35#endif
36
37#if defined(_MSC_VER) && !defined(__clang__)
38#define crt_isfinite(x) _finite((x))
39#define crt_isinf(x) !_finite((x))
40#define crt_isnan(x) _isnan((x))
41#else
42// Define crt_isfinite in terms of the builtin if available, otherwise provide
43// an alternate version in terms of our other functions. This supports some
44// versions of GCC which didn't have __builtin_isfinite.
45#if __has_builtin(__builtin_isfinite)
46#define crt_isfinite(x) __builtin_isfinite((x))
47#elif defined(__GNUC__)
48#define crt_isfinite(x) \
49 __extension__(({ \
50 __typeof((x)) x_ = (x); \
51 !crt_isinf(x_) && !crt_isnan(x_); \
52 }))
53#else
54#error "Do not know how to check for infinity"
55#endif // __has_builtin(__builtin_isfinite)
56#define crt_isinf(x) __builtin_isinf((x))
57#define crt_isnan(x) __builtin_isnan((x))
58#endif // _MSC_VER
59
60#if defined(_MSC_VER) && !defined(__clang__)
61#define crt_copysign(x, y) copysign((x), (y))
62#define crt_copysignf(x, y) copysignf((x), (y))
63#define crt_copysignl(x, y) copysignl((x), (y))
64#else
65#define crt_copysign(x, y) __builtin_copysign((x), (y))
66#define crt_copysignf(x, y) __builtin_copysignf((x), (y))
67#define crt_copysignl(x, y) __builtin_copysignl((x), (y))
68#endif
69
70#if defined(_MSC_VER) && !defined(__clang__)
71#define crt_fabs(x) fabs((x))
72#define crt_fabsf(x) fabsf((x))
73#define crt_fabsl(x) fabs((x))
74#else
75#define crt_fabs(x) __builtin_fabs((x))
76#define crt_fabsf(x) __builtin_fabsf((x))
77#define crt_fabsl(x) __builtin_fabsl((x))
78#endif
79
80#if defined(_MSC_VER) && !defined(__clang__)
81#define crt_fmaxl(x, y) __max((x), (y))
82#else
83#define crt_fmaxl(x, y) __builtin_fmaxl((x), (y))
84#endif
85
86#if defined(_MSC_VER) && !defined(__clang__)
87#define crt_logbl(x) logbl((x))
88#else
89#define crt_logbl(x) __builtin_logbl((x))
90#endif
91
92#if defined(_MSC_VER) && !defined(__clang__)
93#define crt_scalbnl(x, y) scalbnl((x), (y))
94#else
95#define crt_scalbnl(x, y) __builtin_scalbnl((x), (y))
96#endif
97
98#endif // INT_MATH_H
99

source code of compiler-rt/lib/builtins/int_math.h