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llvm-project/libc/include/llvm-libc-macros/math-macros.h
Victor Campos 0b72899f6d
[libc][math] Refactor the math_errhandling macro definition (#166350) 
This patch refactors the logic to define each component of the
`math_errhandling` macro.

It assumes that math error handling is supported by the target and the C
library unless otherwise disabled in the preprocessor logic.

In addition to the refactoring, the support for error handling via
exceptions is explicitly disabled for Arm targets with no FPU, that is,
where `__ARM_FP` is not defined. This is because LLVM libc does not
provide a floating-point environment for Arm no-FP configurations (or at
least one with support for FP exceptions).
2025-11-05 16:59:55 +00:00

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//===-- Definition of macros from math.h ----------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIBC_MACROS_MATH_MACROS_H
#define LLVM_LIBC_MACROS_MATH_MACROS_H
#include "limits-macros.h"
#define FP_NAN 0
#define FP_INFINITE 1
#define FP_ZERO 2
#define FP_SUBNORMAL 3
#define FP_NORMAL 4
#define FP_INT_UPWARD 0
#define FP_INT_DOWNWARD 1
#define FP_INT_TOWARDZERO 2
#define FP_INT_TONEARESTFROMZERO 3
#define FP_INT_TONEAREST 4
#define MATH_ERRNO 1
#define MATH_ERREXCEPT 2
#define HUGE_VAL __builtin_huge_val()
#define HUGE_VALF __builtin_huge_valf()
#define INFINITY __builtin_inff()
#define NAN __builtin_nanf("")
#define FP_ILOGB0 (-INT_MAX - 1)
#define FP_LLOGB0 (-LONG_MAX - 1)
#ifdef __FP_LOGBNAN_MIN
#define FP_ILOGBNAN (-INT_MAX - 1)
#define FP_LLOGBNAN (-LONG_MAX - 1)
#else
#define FP_ILOGBNAN INT_MAX
#define FP_LLOGBNAN LONG_MAX
#endif
// Math error handling. Target support is assumed to be existent unless
// explicitly disabled.
#if defined(__NVPTX__) || defined(__AMDGPU__) || defined(__FAST_MATH__) || \
defined(__NO_MATH_ERRNO__)
#define __LIBC_SUPPORTS_MATH_ERRNO 0
#else
#define __LIBC_SUPPORTS_MATH_ERRNO 1
#endif
#if defined(__FAST_MATH__) || \
((defined(__arm__) || defined(_M_ARM) || defined(__thumb__) || \
defined(__aarch64__) || defined(_M_ARM64)) && \
!defined(__ARM_FP))
#define __LIBC_SUPPORTS_MATH_ERREXCEPT 0
#else
#define __LIBC_SUPPORTS_MATH_ERREXCEPT 1
#endif
#if __LIBC_SUPPORTS_MATH_ERRNO && __LIBC_SUPPORTS_MATH_ERREXCEPT
#define math_errhandling (MATH_ERRNO | MATH_ERREXCEPT)
#elif __LIBC_SUPPORTS_MATH_ERRNO
#define math_errhandling (MATH_ERRNO)
#elif __LIBC_SUPPORTS_MATH_ERREXCEPT
#define math_errhandling (MATH_ERREXCEPT)
#else
#define math_errhandling 0
#endif
#undef __LIBC_SUPPORTS_MATH_ERRNO
#undef __LIBC_SUPPORTS_MATH_ERREXCEPT
// POSIX math constants
// https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/math.h.html
#define M_E (__extension__ 0x1.5bf0a8b145769p1)
#define M_EGAMMA (__extension__ 0x1.2788cfc6fb619p-1)
#define M_LOG2E (__extension__ 0x1.71547652b82fep0)
#define M_LOG10E (__extension__ 0x1.bcb7b1526e50ep-2)
#define M_LN2 (__extension__ 0x1.62e42fefa39efp-1)
#define M_LN10 (__extension__ 0x1.26bb1bbb55516p1)
#define M_PHI (__extension__ 0x1.9e3779b97f4a8p0)
#define M_PI (__extension__ 0x1.921fb54442d18p1)
#define M_PI_2 (__extension__ 0x1.921fb54442d18p0)
#define M_PI_4 (__extension__ 0x1.921fb54442d18p-1)
#define M_1_PI (__extension__ 0x1.45f306dc9c883p-2)
#define M_1_SQRTPI (__extension__ 0x1.20dd750429b6dp-1)
#define M_2_PI (__extension__ 0x1.45f306dc9c883p-1)
#define M_2_SQRTPI (__extension__ 0x1.20dd750429b6dp0)
#define M_SQRT2 (__extension__ 0x1.6a09e667f3bcdp0)
#define M_SQRT3 (__extension__ 0x1.bb67ae8584caap0)
#define M_SQRT1_2 (__extension__ 0x1.6a09e667f3bcdp-1)
#define M_SQRT1_3 (__extension__ 0x1.279a74590331cp-1)
#define M_Ef (__extension__ 0x1.5bf0a8p1f)
#define M_EGAMMAf (__extension__ 0x1.2788dp-1f)
#define M_LOG2Ef (__extension__ 0x1.715476p0f)
#define M_LOG10Ef (__extension__ 0x1.bcb7b2p-2f)
#define M_LN2f (__extension__ 0x1.62e43p-1f)
#define M_LN10f (__extension__ 0x1.26bb1cp1f)
#define M_PHIf (__extension__ 0x1.9e377ap0f)
#define M_PIf (__extension__ 0x1.921fb6p1f)
#define M_PI_2f (__extension__ 0x1.921fb6p0f)
#define M_PI_4f (__extension__ 0x1.921fb6p-1f)
#define M_1_PIf (__extension__ 0x1.45f306p-2f)
#define M_1_SQRTPIf (__extension__ 0x1.20dd76p-1f)
#define M_2_PIf (__extension__ 0x1.45f306p-1f)
#define M_2_SQRTPIf (__extension__ 0x1.20dd76p0f)
#define M_SQRT2f (__extension__ 0x1.6a09e6p0f)
#define M_SQRT3f (__extension__ 0x1.bb67aep0f)
#define M_SQRT1_2f (__extension__ 0x1.6a09e6p-1f)
#define M_SQRT1_3f (__extension__ 0x1.279a74p-1f)
#define M_El (__extension__ 0x1.5bf0a8b1457695355fb8ac404e7ap1L)
#define M_EGAMMAl (__extension__ 0x1.2788cfc6fb618f49a37c7f0202a6p-1L)
#define M_LOG2El (__extension__ 0x1.71547652b82fe1777d0ffda0d23ap0L)
#define M_LOG10El (__extension__ 0x1.bcb7b1526e50e32a6ab7555f5a68p-2L)
#define M_LN2l (__extension__ 0x1.62e42fefa39ef35793c7673007e6p-1L)
#define M_LN10l (__extension__ 0x1.26bb1bbb5551582dd4adac5705a6p1L)
#define M_PHIl (__extension__ 0x1.9e3779b97f4a7c15f39cc0605ceep0L)
#define M_PIl (__extension__ 0x1.921fb54442d18469898cc51701b8p1L)
#define M_PI_2l (__extension__ 0x1.921fb54442d18469898cc51701b8p0L)
#define M_PI_4l (__extension__ 0x1.921fb54442d18469898cc51701b8p-1L)
#define M_1_PIl (__extension__ 0x1.45f306dc9c882a53f84eafa3ea6ap-2L)
#define M_1_SQRTPIl (__extension__ 0x1.20dd750429b6d11ae3a914fed7fep-1L)
#define M_2_PIl (__extension__ 0x1.45f306dc9c882a53f84eafa3ea6ap-1L)
#define M_2_SQRTPIl (__extension__ 0x1.20dd750429b6d11ae3a914fed7fep0L)
#define M_SQRT2l (__extension__ 0x1.6a09e667f3bcc908b2fb1366ea95p0L)
#define M_SQRT3l (__extension__ 0x1.bb67ae8584caa73b25742d7078b8p0L)
#define M_SQRT1_2l (__extension__ 0x1.6a09e667f3bcc908b2fb1366ea95p-1L)
#define M_SQRT1_3l (__extension__ 0x1.279a74590331c4d218f81e4afb25p-1L)
#ifdef __FLT16_MANT_DIG__
#define M_Ef16 (__extension__ 0x1.5cp1f16)
#define M_EGAMMAf16 (__extension__ 0x1.278p-1f16)
#define M_LOG2Ef16 (__extension__ 0x1.714f16)
#define M_LOG10Ef16 (__extension__ 0x1.bccp-2f16)
#define M_LN2f16 (__extension__ 0x1.63p-1f16)
#define M_LN10f16 (__extension__ 0x1.26cp1f16)
#define M_PHIf16 (__extension__ 0x1.9e4p0f16)
#define M_PIf16 (__extension__ 0x1.92p1f16)
#define M_PI_2f16 (__extension__ 0x1.92p0f16)
#define M_PI_4f16 (__extension__ 0x1.92p-1f16)
#define M_1_PIf16 (__extension__ 0x1.46p-2f16)
#define M_1_SQRTPIf16 (__extension__ 0x1.20cp-1f16)
#define M_2_PIf16 (__extension__ 0x1.46p-1f16)
#define M_2_SQRTPIf16 (__extension__ 0x1.20cp0f16)
#define M_SQRT2f16 (__extension__ 0x1.6ap0f16)
#define M_SQRT3f16 (__extension__ 0x1.bb8p0f16)
#define M_SQRT1_2f16 (__extension__ 0x1.6ap-1f16)
#define M_SQRT1_3f16 (__extension__ 0x1.278p-1f16)
#endif // __FLT16_MANT_DIG__
#ifdef __SIZEOF_FLOAT128__
#define M_Ef128 (__extension__ 0x1.5bf0a8b1457695355fb8ac404e7ap1q)
#define M_EGAMMAf128 (__extension__ 0x1.2788cfc6fb618f49a37c7f0202a6p-1q)
#define M_LOG2Ef128 (__extension__ 0x1.71547652b82fe1777d0ffda0d23ap0q)
#define M_LOG10Ef128 (__extension__ 0x1.bcb7b1526e50e32a6ab7555f5a68p-2q)
#define M_LN2f128 (__extension__ 0x1.62e42fefa39ef35793c7673007e6p-1q)
#define M_LN10f128 (__extension__ 0x1.26bb1bbb5551582dd4adac5705a6p1q)
#define M_PHIf128 (__extension__ 0x1.9e3779b97f4a7c15f39cc0605ceep0q)
#define M_PIf128 (__extension__ 0x1.921fb54442d18469898cc51701b8p1q)
#define M_PI_2f128 (__extension__ 0x1.921fb54442d18469898cc51701b8p0q)
#define M_PI_4f128 (__extension__ 0x1.921fb54442d18469898cc51701b8p-1q)
#define M_1_PIf128 (__extension__ 0x1.45f306dc9c882a53f84eafa3ea6ap-2q)
#define M_1_SQRTPIf128 (__extension__ 0x1.20dd750429b6d11ae3a914fed7fep-1q)
#define M_2_PIf128 (__extension__ 0x1.45f306dc9c882a53f84eafa3ea6ap-1q)
#define M_2_SQRTPIf128 (__extension__ 0x1.20dd750429b6d11ae3a914fed7fep0q)
#define M_SQRT2f128 (__extension__ 0x1.6a09e667f3bcc908b2fb1366ea95p0q)
#define M_SQRT3f128 (__extension__ 0x1.bb67ae8584caa73b25742d7078b8p0q)
#define M_SQRT1_2f128 (__extension__ 0x1.6a09e667f3bcc908b2fb1366ea95p-1q)
#define M_SQRT1_3f128 (__extension__ 0x1.279a74590331c4d218f81e4afb25p-1q)
#endif // __SIZEOF_FLOAT128__
#endif // LLVM_LIBC_MACROS_MATH_MACROS_H
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