diff options
Diffstat (limited to 'libc/src/math/generic/powf.cpp')
| -rw-r--r-- | libc/src/math/generic/powf.cpp | 44 |
1 files changed, 21 insertions, 23 deletions
diff --git a/libc/src/math/generic/powf.cpp b/libc/src/math/generic/powf.cpp index 8470eb8..49f33b7 100644 --- a/libc/src/math/generic/powf.cpp +++ b/libc/src/math/generic/powf.cpp @@ -387,24 +387,24 @@ static constexpr DoubleDouble LOG2_R2_DD[] = { }; LIBC_INLINE bool is_odd_integer(float x) { - using FloatProp = typename fputil::FloatProperties<float>; + using FPBits = typename fputil::FPBits<float>; uint32_t x_u = cpp::bit_cast<uint32_t>(x); - int32_t x_e = static_cast<int32_t>((x_u & FloatProp::EXP_MASK) >> - FloatProp::FRACTION_LEN); - int32_t lsb = cpp::countr_zero(x_u | FloatProp::EXP_MASK); + int32_t x_e = + static_cast<int32_t>((x_u & FPBits::EXP_MASK) >> FPBits::FRACTION_LEN); + int32_t lsb = cpp::countr_zero(x_u | FPBits::EXP_MASK); constexpr int32_t UNIT_EXPONENT = - FloatProp::EXP_BIAS + static_cast<int32_t>(FloatProp::FRACTION_LEN); + FPBits::EXP_BIAS + static_cast<int32_t>(FPBits::FRACTION_LEN); return (x_e + lsb == UNIT_EXPONENT); } LIBC_INLINE bool is_integer(float x) { - using FloatProp = typename fputil::FloatProperties<float>; + using FPBits = typename fputil::FPBits<float>; uint32_t x_u = cpp::bit_cast<uint32_t>(x); - int32_t x_e = static_cast<int32_t>((x_u & FloatProp::EXP_MASK) >> - FloatProp::FRACTION_LEN); - int32_t lsb = cpp::countr_zero(x_u | FloatProp::EXP_MASK); + int32_t x_e = + static_cast<int32_t>((x_u & FPBits::EXP_MASK) >> FPBits::FRACTION_LEN); + int32_t lsb = cpp::countr_zero(x_u | FPBits::EXP_MASK); constexpr int32_t UNIT_EXPONENT = - FloatProp::EXP_BIAS + static_cast<int32_t>(FloatProp::FRACTION_LEN); + FPBits::EXP_BIAS + static_cast<int32_t>(FPBits::FRACTION_LEN); return (x_e + lsb >= UNIT_EXPONENT); } @@ -424,7 +424,6 @@ LIBC_INLINE bool larger_exponent(double a, double b) { double powf_double_double(int idx_x, double dx, double y6, double lo6_hi, const DoubleDouble &exp2_hi_mid) { using DoubleBits = typename fputil::FPBits<double>; - using DoubleProp = typename fputil::FloatProperties<double>; // Perform a second range reduction step: // idx2 = round(2^14 * (dx + 2^-8)) = round ( dx * 2^14 + 2^6) // dx2 = (1 + dx) * r2 - 1 @@ -500,7 +499,7 @@ double powf_double_double(int idx_x, double dx, double y6, double lo6_hi, bool lo_sign = DoubleBits(r.lo).get_sign(); if (hi_sign == lo_sign) { ++r_bits; - } else if ((r_bits & DoubleProp::FRACTION_MASK) > 0) { + } else if ((r_bits & DoubleBits::FRACTION_MASK) > 0) { --r_bits; } } @@ -512,8 +511,7 @@ double powf_double_double(int idx_x, double dx, double y6, double lo6_hi, LLVM_LIBC_FUNCTION(float, powf, (float x, float y)) { using FloatBits = typename fputil::FPBits<float>; - using FloatProp = typename fputil::FloatProperties<float>; - using DoubleProp = typename fputil::FloatProperties<double>; + using DoubleBits = typename fputil::FPBits<double>; FloatBits xbits(x), ybits(y); uint32_t x_u = xbits.uintval(); @@ -584,7 +582,7 @@ LLVM_LIBC_FUNCTION(float, powf, (float x, float y)) { // x^y will be overflow / underflow in single precision. Set y to a // large enough exponent but not too large, so that the computations // won't be overflow in double precision. - y = cpp::bit_cast<float>((y_u & FloatProp::SIGN_MASK) + 0x4f800000U); + y = cpp::bit_cast<float>((y_u & FloatBits::SIGN_MASK) + 0x4f800000U); } } } @@ -607,11 +605,11 @@ LLVM_LIBC_FUNCTION(float, powf, (float x, float y)) { return generic::exp10f(y); } - bool x_sign = x_u >= FloatProp::SIGN_MASK; + bool x_sign = x_u >= FloatBits::SIGN_MASK; switch (x_abs) { case 0x0000'0000: { // x = +-0.0f - bool x_sign = (x_u >= FloatProp::SIGN_MASK); + bool x_sign = (x_u >= FloatBits::SIGN_MASK); bool out_sign = x_sign && is_odd_integer(FloatBits(y_u).get_val()); if (y_u > 0x8000'0000U) { // pow(0, negative number) = inf @@ -623,9 +621,9 @@ LLVM_LIBC_FUNCTION(float, powf, (float x, float y)) { return out_sign ? -0.0f : 0.0f; } case 0x7f80'0000: { // x = +-Inf - bool x_sign = (x_u >= FloatProp::SIGN_MASK); + bool x_sign = (x_u >= FloatBits::SIGN_MASK); bool out_sign = x_sign && is_odd_integer(FloatBits(y_u).get_val()); - if (y_u >= FloatProp::SIGN_MASK) { + if (y_u >= FloatBits::SIGN_MASK) { return out_sign ? -0.0f : 0.0f; } return FloatBits::inf(out_sign); @@ -669,11 +667,11 @@ LLVM_LIBC_FUNCTION(float, powf, (float x, float y)) { x_u = FloatBits(x).uintval(); // Extract exponent field of x. - ex += (x_u >> FloatProp::FRACTION_LEN); + ex += (x_u >> FloatBits::FRACTION_LEN); double e_x = static_cast<double>(ex); // Use the highest 7 fractional bits of m_x as the index for look up tables. - uint32_t x_mant = x_u & FloatProp::FRACTION_MASK; - int idx_x = static_cast<int>(x_mant >> (FloatProp::FRACTION_LEN - 7)); + uint32_t x_mant = x_u & FloatBits::FRACTION_MASK; + int idx_x = static_cast<int>(x_mant >> (FloatBits::FRACTION_LEN - 7)); // Add the hidden bit to the mantissa. // 1 <= m_x < 2 float m_x = cpp::bit_cast<float>(x_mant | 0x3f800000); @@ -774,7 +772,7 @@ LLVM_LIBC_FUNCTION(float, powf, (float x, float y)) { int idx_y = hm_i & 0x3f; // 2^hi - int64_t exp_hi_i = (hm_i >> 6) << DoubleProp::FRACTION_LEN; + int64_t exp_hi_i = (hm_i >> 6) << DoubleBits::FRACTION_LEN; // 2^mid int64_t exp_mid_i = cpp::bit_cast<uint64_t>(EXP2_MID1[idx_y].hi); // (-1)^sign * 2^hi * 2^mid |