Fix digits10 bug #4281
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Fix digits10 bug #4281
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Co-Authored-By: Chris Marsh <chrismarsh.c2@gmail.com> Co-Authored-By: Daniel Arndt <arndtd@ornl.gov>
dalg24
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(I permuted the two commits so that both will compile so it is not annoying when doing git bisections) |
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This didn't pass. Maybe really just hardcoding those values is the way to go. |
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What about diff --git a/core/src/Kokkos_NumericTraits.hpp b/core/src/Kokkos_NumericTraits.hpp
index a0b96b8cb..1b0460370 100644
--- a/core/src/Kokkos_NumericTraits.hpp
+++ b/core/src/Kokkos_NumericTraits.hpp
@@ -166,9 +166,29 @@ template <class> struct max_digits10_helper {};
//template <> struct max_digits10_helper<float> { static constexpr int value = FLT_DECIMAL_DIG; };
//template <> struct max_digits10_helper<double> { static constexpr int value = DBL_DECIMAL_DIG; };
//template <> struct max_digits10_helper<long double> { static constexpr int value = LDBL_DECIMAL_DIG; };
-template <> struct max_digits10_helper<float> { static constexpr int value = 9; };
-template <> struct max_digits10_helper<double> { static constexpr int value = 17; };
-template <> struct max_digits10_helper<long double> { static constexpr int value = 21; };
+template <> struct max_digits10_helper<float> {
+#ifdef FLT_DECIMAL_DIG
+ static constexpr int value = FLT_DECIMAL_DIG;
+#else
+ static constexpr int value = (digits_helper<float>::value * 643L+2135)/2136+1;
+#endif
+};
+template <> struct max_digits10_helper<double> {
+#ifdef DBL_DECIMAL_DIG
+ static constexpr int value = DBL_DECIMAL_DIG;
+#else
+ static constexpr int value = (digits_helper<double>::value * 643L+2135)/2136+1;
+#endif
+};
+template <> struct max_digits10_helper<long double> {
+#ifdef DECIMAL_DIG
+ static constexpr int value = DECIMAL_DIG;
+#elif defined(LDBL_DECIMAL_DIG)
+ static constexpr int value = LDBL_DECIMAL_DIG;
+#else
+ static constexpr int value = (digits_helper<long double>::value * 643L+2135)/2136+1;
+#endif
+};(untested) for trying to fix the failing tests? |
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Discovered issue with long double specialization. Replaced hardcoded values by formula suggested by cppreference.com ``` std::ceil(std::numeric_limits<T>::digits * std::log10(2) + 1) ``` Co-Authored-By: Daniel Arndt <arndtd@ornl.gov>
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Chrismarsh
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crtrott
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* Fixes constexpr errors with frounding-math on gcc < 10. Use std::numeric_limits digits10 instead of bespoke version trilinos/Trilinos/issues/9056 /issues/4267 * Remove limits + std::numeric_limits as this is not available on all backends and follow gcc's constexpr-valid approximation of log10(2) * Update the log10_2 type to int * Revert log10_2 changes en lieu of /pull/4281 * declare const Co-authored-by: Damien L-G <dalg24+github@gmail.com> * update comment * remove const as it causes various ctors to be implicitly deleted Co-authored-by: Damien L-G <dalg24+github@gmail.com>
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Fix #4280
Conflicts with #4278