143 lines
3.6 KiB
C++
143 lines
3.6 KiB
C++
#pragma once
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#include <c10/macros/Macros.h>
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#include <c10/util/BFloat16.h>
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#include <c10/util/Half.h>
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C10_CLANG_DIAGNOSTIC_PUSH()
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#if C10_CLANG_HAS_WARNING("-Wimplicit-float-conversion")
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C10_CLANG_DIAGNOSTIC_IGNORE("-Wimplicit-float-conversion")
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#endif
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namespace c10 {
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// TODO: Replace me with inline constexpr variable when C++17 becomes available
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namespace detail {
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template <typename T>
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C10_HOST_DEVICE inline constexpr T e() {
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return static_cast<T>(2.718281828459045235360287471352662);
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}
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template <typename T>
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C10_HOST_DEVICE inline constexpr T euler() {
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return static_cast<T>(0.577215664901532860606512090082402);
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}
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template <typename T>
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C10_HOST_DEVICE inline constexpr T frac_1_pi() {
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return static_cast<T>(0.318309886183790671537767526745028);
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}
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template <typename T>
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C10_HOST_DEVICE inline constexpr T frac_1_sqrt_pi() {
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return static_cast<T>(0.564189583547756286948079451560772);
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}
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template <typename T>
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C10_HOST_DEVICE inline constexpr T frac_sqrt_2() {
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return static_cast<T>(0.707106781186547524400844362104849);
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}
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template <typename T>
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C10_HOST_DEVICE inline constexpr T frac_sqrt_3() {
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return static_cast<T>(0.577350269189625764509148780501957);
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}
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template <typename T>
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C10_HOST_DEVICE inline constexpr T golden_ratio() {
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return static_cast<T>(1.618033988749894848204586834365638);
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}
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template <typename T>
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C10_HOST_DEVICE inline constexpr T ln_10() {
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return static_cast<T>(2.302585092994045684017991454684364);
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}
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template <typename T>
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C10_HOST_DEVICE inline constexpr T ln_2() {
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return static_cast<T>(0.693147180559945309417232121458176);
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}
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template <typename T>
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C10_HOST_DEVICE inline constexpr T log_10_e() {
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return static_cast<T>(0.434294481903251827651128918916605);
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}
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template <typename T>
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C10_HOST_DEVICE inline constexpr T log_2_e() {
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return static_cast<T>(1.442695040888963407359924681001892);
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}
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template <typename T>
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C10_HOST_DEVICE inline constexpr T pi() {
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return static_cast<T>(3.141592653589793238462643383279502);
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}
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template <typename T>
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C10_HOST_DEVICE inline constexpr T sqrt_2() {
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return static_cast<T>(1.414213562373095048801688724209698);
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}
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template <typename T>
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C10_HOST_DEVICE inline constexpr T sqrt_3() {
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return static_cast<T>(1.732050807568877293527446341505872);
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}
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template <>
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C10_HOST_DEVICE inline constexpr BFloat16 pi<BFloat16>() {
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// According to
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// https://en.wikipedia.org/wiki/Bfloat16_floating-point_format#Special_values
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// pi is encoded as 4049
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return BFloat16(0x4049, BFloat16::from_bits());
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}
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template <>
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C10_HOST_DEVICE inline constexpr Half pi<Half>() {
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return Half(0x4248, Half::from_bits());
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}
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} // namespace detail
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template <typename T>
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constexpr T e = c10::detail::e<T>();
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template <typename T>
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constexpr T euler = c10::detail::euler<T>();
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template <typename T>
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constexpr T frac_1_pi = c10::detail::frac_1_pi<T>();
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template <typename T>
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constexpr T frac_1_sqrt_pi = c10::detail::frac_1_sqrt_pi<T>();
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template <typename T>
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constexpr T frac_sqrt_2 = c10::detail::frac_sqrt_2<T>();
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template <typename T>
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constexpr T frac_sqrt_3 = c10::detail::frac_sqrt_3<T>();
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template <typename T>
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constexpr T golden_ratio = c10::detail::golden_ratio<T>();
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template <typename T>
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constexpr T ln_10 = c10::detail::ln_10<T>();
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template <typename T>
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constexpr T ln_2 = c10::detail::ln_2<T>();
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template <typename T>
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constexpr T log_10_e = c10::detail::log_10_e<T>();
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template <typename T>
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constexpr T log_2_e = c10::detail::log_2_e<T>();
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template <typename T>
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constexpr T pi = c10::detail::pi<T>();
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template <typename T>
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constexpr T sqrt_2 = c10::detail::sqrt_2<T>();
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template <typename T>
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constexpr T sqrt_3 = c10::detail::sqrt_3<T>();
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} // namespace c10
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C10_CLANG_DIAGNOSTIC_POP()
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