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[libc][math][c23] Add sinhf16 and coshf16 C23 math functions
Part of #95250.
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| Original file line number | Diff line number | Diff line change |
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| //===-- Implementation header for coshf16 -----------------------*- C++ -*-===// | ||
| // | ||
| // 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 | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
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| #ifndef LLVM_LIBC_SRC_MATH_COSHF16_H | ||
| #define LLVM_LIBC_SRC_MATH_COSHF16_H | ||
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| #include "src/__support/macros/config.h" | ||
| #include "src/__support/macros/properties/types.h" | ||
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| namespace LIBC_NAMESPACE_DECL { | ||
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| float16 coshf16(float16 x); | ||
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| } // namespace LIBC_NAMESPACE_DECL | ||
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| #endif // LLVM_LIBC_SRC_MATH_COSHF16_H |
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| Original file line number | Diff line number | Diff line change |
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| //===-- Half-precision cosh(x) function -----------------------------------===// | ||
| // | ||
| // 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 | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
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| #include "src/math/coshf16.h" | ||
| #include "expxf16.h" | ||
| #include "hdr/errno_macros.h" | ||
| #include "hdr/fenv_macros.h" | ||
| #include "src/__support/FPUtil/FEnvImpl.h" | ||
| #include "src/__support/FPUtil/FPBits.h" | ||
| #include "src/__support/FPUtil/except_value_utils.h" | ||
| #include "src/__support/FPUtil/rounding_mode.h" | ||
| #include "src/__support/common.h" | ||
| #include "src/__support/macros/config.h" | ||
| #include "src/__support/macros/optimization.h" | ||
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| namespace LIBC_NAMESPACE_DECL { | ||
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| static constexpr fputil::ExceptValues<float16, 9> COSHF16_EXCEPTS_POS = {{ | ||
| // x = 0x1.6ap-5, coshf16(x) = 0x1p+0 (RZ) | ||
| {0x29a8U, 0x3c00U, 1U, 0U, 1U}, | ||
| // x = 0x1.8c4p+0, coshf16(x) = 0x1.3a8p+1 (RZ) | ||
| {0x3e31U, 0x40eaU, 1U, 0U, 0U}, | ||
| // x = 0x1.994p+0, coshf16(x) = 0x1.498p+1 (RZ) | ||
| {0x3e65U, 0x4126U, 1U, 0U, 0U}, | ||
| // x = 0x1.b6p+0, coshf16(x) = 0x1.6d8p+1 (RZ) | ||
| {0x3ed8U, 0x41b6U, 1U, 0U, 1U}, | ||
| // x = 0x1.aap+1, coshf16(x) = 0x1.be8p+3 (RZ) | ||
| {0x42a8U, 0x4afaU, 1U, 0U, 1U}, | ||
| // x = 0x1.cc4p+1, coshf16(x) = 0x1.23cp+4 (RZ) | ||
| {0x4331U, 0x4c8fU, 1U, 0U, 0U}, | ||
| // x = 0x1.288p+2, coshf16(x) = 0x1.9b4p+5 (RZ) | ||
| {0x44a2U, 0x526dU, 1U, 0U, 0U}, | ||
| // x = 0x1.958p+2, coshf16(x) = 0x1.1a4p+8 (RZ) | ||
| {0x4656U, 0x5c69U, 1U, 0U, 0U}, | ||
| // x = 0x1.5fp+3, coshf16(x) = 0x1.c54p+14 (RZ) | ||
| {0x497cU, 0x7715U, 1U, 0U, 1U}, | ||
| }}; | ||
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| static constexpr fputil::ExceptValues<float16, 4> COSHF16_EXCEPTS_NEG = {{ | ||
| // x = -0x1.6ap-5, coshf16(x) = 0x1p+0 (RZ) | ||
| {0xa9a8U, 0x3c00U, 1U, 0U, 1U}, | ||
| // x = -0x1.b6p+0, coshf16(x) = 0x1.6d8p+1 (RZ) | ||
| {0xbed8U, 0x41b6U, 1U, 0U, 1U}, | ||
| // x = -0x1.288p+2, coshf16(x) = 0x1.9b4p+5 (RZ) | ||
| {0xc4a2U, 0x526dU, 1U, 0U, 0U}, | ||
| // x = -0x1.5fp+3, coshf16(x) = 0x1.c54p+14 (RZ) | ||
| {0xc97cU, 0x7715U, 1U, 0U, 1U}, | ||
| }}; | ||
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| LLVM_LIBC_FUNCTION(float16, coshf16, (float16 x)) { | ||
| using FPBits = fputil::FPBits<float16>; | ||
| FPBits x_bits(x); | ||
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| uint16_t x_u = x_bits.uintval(); | ||
| uint16_t x_abs = x_u & 0x7fffU; | ||
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| // When |x| >= acosh(2^16), or x is NaN. | ||
| if (LIBC_UNLIKELY(x_abs >= 0x49e5U)) { | ||
| // cosh(NaN) = NaN | ||
| if (x_bits.is_nan()) { | ||
| if (x_bits.is_signaling_nan()) { | ||
| fputil::raise_except_if_required(FE_INVALID); | ||
| return FPBits::quiet_nan().get_val(); | ||
| } | ||
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| return x; | ||
| } | ||
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| // When |x| >= acosh(2^16). | ||
| if (x_abs >= 0x49e5U) { | ||
| // cosh(+/-inf) = +inf | ||
| if (x_bits.is_inf()) | ||
| return FPBits::inf().get_val(); | ||
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| switch (fputil::quick_get_round()) { | ||
| case FE_TONEAREST: | ||
| case FE_UPWARD: | ||
| fputil::set_errno_if_required(ERANGE); | ||
| fputil::raise_except_if_required(FE_OVERFLOW | FE_INEXACT); | ||
| return FPBits::inf().get_val(); | ||
| default: | ||
| return FPBits::max_normal().get_val(); | ||
| } | ||
| } | ||
| } | ||
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| if (x_bits.is_pos()) { | ||
| if (auto r = COSHF16_EXCEPTS_POS.lookup(x_u); LIBC_UNLIKELY(r.has_value())) | ||
| return r.value(); | ||
| } else { | ||
| if (auto r = COSHF16_EXCEPTS_NEG.lookup(x_u); LIBC_UNLIKELY(r.has_value())) | ||
| return r.value(); | ||
| } | ||
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| return eval_sinh_or_cosh</*IsSinh=*/false>(x); | ||
| } | ||
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| } // namespace LIBC_NAMESPACE_DECL |
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