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[Alignment][NFC] Add a helper function to DataLayout

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Summary:
This is patch is part of a series to introduce an Alignment type.
See this thread for context: http://lists.llvm.org/pipermail/llvm-dev/2019-July/133851.html
See this patch for the introduction of the type: https://reviews.llvm.org/D64790

Reviewers: courbet

Subscribers: llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D69258

llvm-svn: 375413
This commit is contained in:
Guillaume Chatelet 2019-10-21 13:58:33 +00:00
parent fe263c4f0f
commit c7a76d6bf0
2 changed files with 19 additions and 0 deletions
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7
llvm/include/llvm/IR/DataLayout.h
View File

@ -504,6 +504,13 @@ public:
/// Returns the minimum ABI-required alignment for the specified type.
unsigned getABITypeAlignment(Type *Ty) const;
/// Helper function to return `Alignment` if it's set or the result of
/// `getABITypeAlignment(Ty)`, in any case the result is a valid alignment.
inline Align getValueOrABITypeAlignment(MaybeAlign Alignment,
Type *Ty) const {
return Alignment ? *Alignment : Align(getABITypeAlignment(Ty));
}
/// Returns the minimum ABI-required alignment for an integer type of
/// the specified bitwidth.
Align getABIIntegerTypeAlignment(unsigned BitWidth) const;

12
llvm/unittests/IR/DataLayoutTest.cpp
View File

@ -7,6 +7,8 @@
//===----------------------------------------------------------------------===//
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Type.h"
#include "gtest/gtest.h"
using namespace llvm;
@ -44,4 +46,14 @@ TEST(DataLayoutTest, FunctionPtrAlign) {
EXPECT_EQ(a, c);
}
TEST(DataLayoutTest, ValueOrABITypeAlignment) {
const DataLayout DL("Fi8");
LLVMContext Context;
Type *const FourByteAlignType = Type::getInt32Ty(Context);
EXPECT_EQ(Align(16),
DL.getValueOrABITypeAlignment(MaybeAlign(16), FourByteAlignType));
EXPECT_EQ(Align(4),
DL.getValueOrABITypeAlignment(MaybeAlign(), FourByteAlignType));
}
} // anonymous namespace