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Add FMT_REDUCE_INT_INSTANTIATIONS flag #1781

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merged 4 commits into from
Jul 19, 2020
Merged

Add FMT_REDUCE_INT_INSTANTIATIONS flag #1781

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b8f53a0
Remove <typename UInt> from int_writer
Jul 16, 2020
cb0a609
Add FMT_USE_SMALLEST_INT flag
Jul 18, 2020
e136a9d
Renam flag to FMT_REDUCE_INT_INSTANTIATIONS
Jul 19, 2020
c6bc78c
Move FMT_REDUCE_INT_INSTANTIATIONS to format.h
Jul 19, 2020
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8 changes: 8 additions & 0 deletions include/fmt/core.h
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Original file line number Diff line number Diff line change
Expand Up @@ -311,6 +311,14 @@ struct int128_t {};
struct uint128_t {};
#endif

// Defining FMT_REDUCE_INT_INSTANTIATIONS to 1, will reduce the number of
// int_writer template instances to just one by only using the largest integer
// type. This results in a reduction in binary size but will cause a decrease in
// integer formatting performance.
#if !defined(FMT_REDUCE_INT_INSTANTIATIONS)
# define FMT_REDUCE_INT_INSTANTIATIONS 0
#endif
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// Casts a nonnegative integer to unsigned.
template <typename Int>
FMT_CONSTEXPR typename std::make_unsigned<Int>::type to_unsigned(Int value) {
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7 changes: 7 additions & 0 deletions include/fmt/format.h
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Expand Up @@ -726,12 +726,19 @@ FMT_CONSTEXPR bool is_supported_floating_point(T) {
(std::is_same<T, long double>::value && FMT_USE_LONG_DOUBLE);
}

#if FMT_REDUCE_INT_INSTANTIATIONS
// Pick the largest integer container to represent all values of T.
template <typename T>
using uint32_or_64_or_128_t =
conditional_t<sizeof(uint128_t) < sizeof(uint64_t), uint64_t, uint128_t>;
#else
// Smallest of uint32_t, uint64_t, uint128_t that is large enough to
// represent all values of T.
template <typename T>
using uint32_or_64_or_128_t = conditional_t<
std::numeric_limits<T>::digits <= 32, uint32_t,
conditional_t<std::numeric_limits<T>::digits <= 64, uint64_t, uint128_t>>;
#endif

// Static data is placed in this class template for the header-only config.
template <typename T = void> struct FMT_EXTERN_TEMPLATE_API basic_data {
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