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[ADT] Move IsSizeLessThanThresholdT into AdjustedParamTBase (NFC) #159900

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Merged
kazutakahirata merged 1 commit into from
Sep 20, 2025
Merged

[ADT] Move IsSizeLessThanThresholdT into AdjustedParamTBase (NFC) #159900

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10 changes: 3 additions & 7 deletions llvm/include/llvm/ADT/FunctionExtras.h
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Original file line number Diff line number Diff line change
Expand Up @@ -82,13 +82,6 @@ template <typename ReturnT, typename... ParamTs> class UniqueFunctionBase {
static constexpr size_t InlineStorageSize = sizeof(void *) * 3;
static constexpr size_t InlineStorageAlign = alignof(void *);

template <typename T, class = void>
struct IsSizeLessThanThresholdT : std::false_type {};

template <typename T>
struct IsSizeLessThanThresholdT<
T, std::enable_if_t<sizeof(T) <= 2 * sizeof(void *)>> : std::true_type {};

// Provide a type function to map parameters that won't observe extra copies
// or moves and which are small enough to likely pass in register to values
// and all other types to l-value reference types. We use this to compute the
Expand All @@ -101,6 +94,9 @@ template <typename ReturnT, typename... ParamTs> class UniqueFunctionBase {
template <typename T> struct AdjustedParamTBase {
static_assert(!std::is_reference<T>::value,
"references should be handled by template specialization");
template <typename U>
using IsSizeLessThanThresholdT =
std::bool_constant<sizeof(U) <= 2 * sizeof(void *)>;
using type =
std::conditional_t<std::is_trivially_copy_constructible<T>::value &&
std::is_trivially_move_constructible<T>::value &&
Expand Down