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exp: adjust boundaries for single-precision floating point #295

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Aug 31, 2021
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exp: adjust boundaries for single-precision floating point #295

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11 changes: 9 additions & 2 deletions Vc/common/exponential.h
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Original file line number Diff line number Diff line change
Expand Up @@ -37,8 +37,15 @@ Direct inquiries to 30 Frost Street, Cambridge, MA 02140
#ifdef Vc_COMMON_MATH_H_INTERNAL

constexpr float log2_e = 1.44269504088896341f;
constexpr float MAXLOGF = 88.72283905206835f;
constexpr float MINLOGF = -103.278929903431851103f; /* log(2^-149) */

// These constants are adjusted to account for single-precision floating point.
// The original are for double precision:
//
// constexpr float MAXLOGF = 88.72283905206835f;
// constexpr float MINLOGF = -103.278929903431851103f; /* log(2^-149) */

constexpr float MAXLOGF = 88.722831726074219f; /* log(2^127.99998474121094f) */
constexpr float MINLOGF = -88.029685974121094f; /* log(2^-126.99999237060547f) */
constexpr float MAXNUMF = 3.4028234663852885981170418348451692544e38f;

template <typename Abi, typename = enable_if<std::is_same<Abi, VectorAbi::Sse>::value ||
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