diff options
Diffstat (limited to 'libc/src/math/generic/asinhf16.cpp')
-rw-r--r-- | libc/src/math/generic/asinhf16.cpp | 96 |
1 files changed, 2 insertions, 94 deletions
diff --git a/libc/src/math/generic/asinhf16.cpp b/libc/src/math/generic/asinhf16.cpp index 0a0b471..d517e63 100644 --- a/libc/src/math/generic/asinhf16.cpp +++ b/libc/src/math/generic/asinhf16.cpp @@ -7,102 +7,10 @@ //===----------------------------------------------------------------------===// #include "src/math/asinhf16.h" -#include "explogxf.h" -#include "hdr/fenv_macros.h" -#include "src/__support/FPUtil/FEnvImpl.h" -#include "src/__support/FPUtil/FPBits.h" -#include "src/__support/FPUtil/PolyEval.h" -#include "src/__support/FPUtil/cast.h" -#include "src/__support/FPUtil/except_value_utils.h" -#include "src/__support/FPUtil/multiply_add.h" -#include "src/__support/FPUtil/rounding_mode.h" -#include "src/__support/FPUtil/sqrt.h" -#include "src/__support/common.h" -#include "src/__support/macros/config.h" -#include "src/__support/macros/optimization.h" +#include "src/__support/math/asinhf16.h" namespace LIBC_NAMESPACE_DECL { -#ifndef LIBC_MATH_HAS_SKIP_ACCURATE_PASS -static constexpr size_t N_EXCEPTS = 8; - -static constexpr fputil::ExceptValues<float16, N_EXCEPTS> ASINHF16_EXCEPTS{{ - // (input, RZ output, RU offset, RD offset, RN offset) - - // x = 0x1.da4p-2, asinhf16(x) = 0x1.ca8p-2 (RZ) - {0x3769, 0x372a, 1, 0, 1}, - // x = 0x1.d6cp-1, asinhf16(x) = 0x1.a58p-1 (RZ) - {0x3b5b, 0x3a96, 1, 0, 0}, - // x = 0x1.c7cp+3, asinhf16(x) = 0x1.accp+1 (RZ) - {0x4b1f, 0x42b3, 1, 0, 0}, - // x = 0x1.26cp+4, asinhf16(x) = 0x1.cd8p+1 (RZ) - {0x4c9b, 0x4336, 1, 0, 1}, - // x = -0x1.da4p-2, asinhf16(x) = -0x1.ca8p-2 (RZ) - {0xb769, 0xb72a, 0, 1, 1}, - // x = -0x1.d6cp-1, asinhf16(x) = -0x1.a58p-1 (RZ) - {0xbb5b, 0xba96, 0, 1, 0}, - // x = -0x1.c7cp+3, asinhf16(x) = -0x1.accp+1 (RZ) - {0xcb1f, 0xc2b3, 0, 1, 0}, - // x = -0x1.26cp+4, asinhf16(x) = -0x1.cd8p+1 (RZ) - {0xcc9b, 0xc336, 0, 1, 1}, -}}; -#endif // !LIBC_MATH_HAS_SKIP_ACCURATE_PASS - -LLVM_LIBC_FUNCTION(float16, asinhf16, (float16 x)) { - using namespace acoshf_internal; - using FPBits = fputil::FPBits<float16>; - FPBits xbits(x); - - uint16_t x_u = xbits.uintval(); - uint16_t x_abs = x_u & 0x7fff; - - if (LIBC_UNLIKELY(xbits.is_inf_or_nan())) { - if (xbits.is_signaling_nan()) { - fputil::raise_except_if_required(FE_INVALID); - return FPBits::quiet_nan().get_val(); - } - - return x; - } - -#ifndef LIBC_MATH_HAS_SKIP_ACCURATE_PASS - // Handle exceptional values - if (auto r = ASINHF16_EXCEPTS.lookup(x_u); LIBC_UNLIKELY(r.has_value())) - return r.value(); -#endif // !LIBC_MATH_HAS_SKIP_ACCURATE_PASS - - float xf = x; - const float SIGN[2] = {1.0f, -1.0f}; - float x_sign = SIGN[x_u >> 15]; - - // |x| <= 0.25 - if (LIBC_UNLIKELY(x_abs <= 0x3400)) { - // when |x| < 0x1.718p-5, asinhf16(x) = x. Adjust by 1 ULP for certain - // rounding types. - if (LIBC_UNLIKELY(x_abs < 0x29c6)) { - int rounding = fputil::quick_get_round(); - if ((rounding == FE_UPWARD || rounding == FE_TOWARDZERO) && xf < 0) - return fputil::cast<float16>(xf + 0x1p-24f); - if ((rounding == FE_DOWNWARD || rounding == FE_TOWARDZERO) && xf > 0) - return fputil::cast<float16>(xf - 0x1p-24f); - return fputil::cast<float16>(xf); - } - - float x_sq = xf * xf; - // Generated by Sollya with: - // > P = fpminimax(asinh(x)/x, [|0, 2, 4, 6, 8|], [|SG...|], [0, 2^-2]); - // The last coefficient 0x1.bd114ep-6f has been changed to 0x1.bd114ep-5f - // for better accuracy. - float p = fputil::polyeval(x_sq, 1.0f, -0x1.555552p-3f, 0x1.332f6ap-4f, - -0x1.6c53dep-5f, 0x1.bd114ep-5f); - - return fputil::cast<float16>(xf * p); - } - - // General case: asinh(x) = ln(x + sqrt(x^2 + 1)) - float sqrt_term = fputil::sqrt<float>(fputil::multiply_add(xf, xf, 1.0f)); - return fputil::cast<float16>( - x_sign * log_eval(fputil::multiply_add(xf, x_sign, sqrt_term))); -} +LLVM_LIBC_FUNCTION(float16, asinhf16, (float16 x)) { return math::asinhf16(x); } } // namespace LIBC_NAMESPACE_DECL |