diff options
Diffstat (limited to 'libc/src/math/generic')
| -rw-r--r-- | libc/src/math/generic/CMakeLists.txt | 10 | ||||
| -rw-r--r-- | libc/src/math/generic/exp2f16.cpp | 86 |
2 files changed, 3 insertions, 93 deletions
diff --git a/libc/src/math/generic/CMakeLists.txt b/libc/src/math/generic/CMakeLists.txt index 55f4aaf..0754b5e 100644 --- a/libc/src/math/generic/CMakeLists.txt +++ b/libc/src/math/generic/CMakeLists.txt @@ -1478,15 +1478,7 @@ add_entrypoint_object( HDRS ../exp2f16.h DEPENDS - libc.hdr.errno_macros - libc.hdr.fenv_macros - libc.src.__support.FPUtil.cast - libc.src.__support.FPUtil.except_value_utils - libc.src.__support.FPUtil.fenv_impl - libc.src.__support.FPUtil.fp_bits - libc.src.__support.FPUtil.rounding_mode - libc.src.__support.macros.optimization - libc.src.__support.math.expxf16_utils + libc.src.__support.math.exp2f16 ) add_entrypoint_object( diff --git a/libc/src/math/generic/exp2f16.cpp b/libc/src/math/generic/exp2f16.cpp index 5db0c3a..80799d4 100644 --- a/libc/src/math/generic/exp2f16.cpp +++ b/libc/src/math/generic/exp2f16.cpp @@ -7,92 +7,10 @@ //===----------------------------------------------------------------------===// #include "src/math/exp2f16.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/cast.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" -#include "src/__support/math/expxf16_utils.h" +#include "src/__support/math/exp2f16.h" namespace LIBC_NAMESPACE_DECL { -#ifndef LIBC_MATH_HAS_SKIP_ACCURATE_PASS -static constexpr fputil::ExceptValues<float16, 3> EXP2F16_EXCEPTS = {{ - // (input, RZ output, RU offset, RD offset, RN offset) - // x = 0x1.714p-11, exp2f16(x) = 0x1p+0 (RZ) - {0x11c5U, 0x3c00U, 1U, 0U, 1U}, - // x = -0x1.558p-4, exp2f16(x) = 0x1.e34p-1 (RZ) - {0xad56U, 0x3b8dU, 1U, 0U, 0U}, - // x = -0x1.d5cp-4, exp2f16(x) = 0x1.d8cp-1 (RZ) - {0xaf57U, 0x3b63U, 1U, 0U, 0U}, -}}; -#endif // !LIBC_MATH_HAS_SKIP_ACCURATE_PASS - -LLVM_LIBC_FUNCTION(float16, exp2f16, (float16 x)) { - using namespace math::expxf16_internal; - using FPBits = fputil::FPBits<float16>; - FPBits x_bits(x); - - uint16_t x_u = x_bits.uintval(); - uint16_t x_abs = x_u & 0x7fffU; - - // When |x| >= 16, or x is NaN. - if (LIBC_UNLIKELY(x_abs >= 0x4c00U)) { - // exp2(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(); - } - - return x; - } - - // When x >= 16. - if (x_bits.is_pos()) { - // exp2(+inf) = +inf - if (x_bits.is_inf()) - return FPBits::inf().get_val(); - - switch (fputil::quick_get_round()) { - case FE_TONEAREST: - case FE_UPWARD: - fputil::set_errno_if_required(ERANGE); - fputil::raise_except_if_required(FE_OVERFLOW); - return FPBits::inf().get_val(); - default: - return FPBits::max_normal().get_val(); - } - } - - // When x <= -25. - if (x_u >= 0xce40U) { - // exp2(-inf) = +0 - if (x_bits.is_inf()) - return FPBits::zero().get_val(); - - fputil::set_errno_if_required(ERANGE); - fputil::raise_except_if_required(FE_UNDERFLOW | FE_INEXACT); - - if (fputil::fenv_is_round_up()) - return FPBits::min_subnormal().get_val(); - return FPBits::zero().get_val(); - } - } - -#ifndef LIBC_MATH_HAS_SKIP_ACCURATE_PASS - if (auto r = EXP2F16_EXCEPTS.lookup(x_u); LIBC_UNLIKELY(r.has_value())) - return r.value(); -#endif // !LIBC_MATH_HAS_SKIP_ACCURATE_PASS - - // exp2(x) = exp2(hi + mid) * exp2(lo) - auto [exp2_hi_mid, exp2_lo] = exp2_range_reduction(x); - return fputil::cast<float16>(exp2_hi_mid * exp2_lo); -} +LLVM_LIBC_FUNCTION(float16, exp2f16, (float16 x)) { return math::exp2f16(x); } } // namespace LIBC_NAMESPACE_DECL |