LLVM
15.0.0git
include
llvm
Support
AlignOf.h
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//===--- AlignOf.h - Portable calculation of type alignment -----*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the AlignedCharArrayUnion class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_ALIGNOF_H
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#define LLVM_SUPPORT_ALIGNOF_H
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#include <type_traits>
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namespace
llvm
{
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/// A suitably aligned and sized character array member which can hold elements
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/// of any type.
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///
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/// This template is equivalent to std::aligned_union_t<1, ...>, but we cannot
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/// use it due to a bug in the MSVC x86 compiler:
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/// https://github.com/microsoft/STL/issues/1533
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/// Using `alignas` here works around the bug.
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template
<
typename
T
,
typename
... Ts>
struct
AlignedCharArrayUnion
{
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using
AlignedUnion
= std::aligned_union_t<1,
T
, Ts...>;
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alignas
(
alignof
(
AlignedUnion
))
char
buffer
[
sizeof
(
AlignedUnion
)];
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};
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}
// end namespace llvm
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#endif // LLVM_SUPPORT_ALIGNOF_H
llvm
This is an optimization pass for GlobalISel generic memory operations.
Definition:
AddressRanges.h:17
llvm::AlignedCharArrayUnion< detail::DenseSetPair< ValueT >[InlineBuckets], LargeRep >::AlignedUnion
std::aligned_union_t< 1, detail::DenseSetPair< ValueT >, Ts... > AlignedUnion
Definition:
AlignOf.h:28
T
#define T
Definition:
Mips16ISelLowering.cpp:341
llvm::AlignedCharArrayUnion
A suitably aligned and sized character array member which can hold elements of any type.
Definition:
AlignOf.h:27
llvm::AlignedCharArrayUnion::buffer
char buffer[sizeof(AlignedUnion)]
Definition:
AlignOf.h:29
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