| 1 | //===- TemplateExtras.h -----------------------------------------*- C++ -*-===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #ifndef MLIR_DIALECT_SPARSETENSOR_IR_DETAIL_TEMPLATEEXTRAS_H |
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| 10 | #define |
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| 11 | |
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| 12 | #include <utility> |
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| 13 | |
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| 14 | #include "llvm/ADT/STLExtras.h" |
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| 15 | #include "llvm/Support/raw_ostream.h" |
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| 16 | |
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| 17 | namespace mlir { |
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| 18 | namespace sparse_tensor { |
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| 19 | namespace ir_detail { |
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| 20 | |
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| 21 | //===----------------------------------------------------------------------===// |
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| 22 | template <typename T> |
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| 23 | using has_print_method = |
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| 24 | decltype(std::declval<T>().print(std::declval<llvm::raw_ostream &>())); |
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| 25 | template <typename T> |
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| 26 | using detect_has_print_method = llvm::is_detected<has_print_method, T>; |
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| 27 | template <typename T, typename R = void> |
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| 28 | using enable_if_has_print_method = |
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| 29 | std::enable_if_t<detect_has_print_method<T>::value, R>; |
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| 30 | |
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| 31 | /// Generic template for defining `operator<<` overloads which delegate |
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| 32 | /// to `T::print(raw_ostream&) const`. |
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| 33 | template <typename T> |
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| 34 | inline enable_if_has_print_method<T, llvm::raw_ostream &> |
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| 35 | operator<<(llvm::raw_ostream &os, T const &t) { |
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| 36 | t.print(os); |
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| 37 | return os; |
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| 38 | } |
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| 39 | |
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| 40 | //===----------------------------------------------------------------------===// |
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| 41 | template <typename T> |
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| 42 | static constexpr bool IsZeroCostAbstraction = |
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| 43 | // These two predicates license the compiler to make optimizations. |
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| 44 | std::is_trivially_copyable_v<T> && std::is_trivially_destructible_v<T> && |
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| 45 | // This helps ensure ABI compatibility (e.g., padding and alignment). |
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| 46 | std::is_standard_layout_v<T> && |
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| 47 | // These two are what SmallVector uses to determine whether it can |
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| 48 | // use memcpy. |
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| 49 | std::is_trivially_copy_constructible<T>::value && |
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| 50 | std::is_trivially_move_constructible<T>::value; |
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| 51 | |
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| 52 | //===----------------------------------------------------------------------===// |
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| 53 | |
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| 54 | } // namespace ir_detail |
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| 55 | } // namespace sparse_tensor |
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| 56 | } // namespace mlir |
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| 57 | |
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| 58 | #endif // MLIR_DIALECT_SPARSETENSOR_IR_DETAIL_TEMPLATEEXTRAS_H |
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| 59 | |
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