8002fa6760
The LangRef incorrectly says that if no exact match is found when seeking alignment for a vector type, the largest vector type smaller than the sought-after vector type. This is incorrect as vector types require an exact match, else they fall back to reporting the natural alignment. The corrected rule was not added in its place, as rules for other types (e.g., floating-point types) aren't documented. A unit test was added to demonstrate this. Reviewed By: aeubanks Differential Revision: https://reviews.llvm.org/D112463
108 lines
4.3 KiB
C++
108 lines
4.3 KiB
C++
//===- ConstantRangeTest.cpp - ConstantRange tests ------------------------===//
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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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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/GlobalVariable.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/Type.h"
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#include "llvm/Testing/Support/Error.h"
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#include "gtest/gtest.h"
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using namespace llvm;
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namespace {
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TEST(DataLayoutTest, FunctionPtrAlign) {
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EXPECT_EQ(MaybeAlign(0), DataLayout("").getFunctionPtrAlign());
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EXPECT_EQ(MaybeAlign(1), DataLayout("Fi8").getFunctionPtrAlign());
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EXPECT_EQ(MaybeAlign(2), DataLayout("Fi16").getFunctionPtrAlign());
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EXPECT_EQ(MaybeAlign(4), DataLayout("Fi32").getFunctionPtrAlign());
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EXPECT_EQ(MaybeAlign(8), DataLayout("Fi64").getFunctionPtrAlign());
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EXPECT_EQ(MaybeAlign(1), DataLayout("Fn8").getFunctionPtrAlign());
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EXPECT_EQ(MaybeAlign(2), DataLayout("Fn16").getFunctionPtrAlign());
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EXPECT_EQ(MaybeAlign(4), DataLayout("Fn32").getFunctionPtrAlign());
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EXPECT_EQ(MaybeAlign(8), DataLayout("Fn64").getFunctionPtrAlign());
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EXPECT_EQ(DataLayout::FunctionPtrAlignType::Independent, \
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DataLayout("").getFunctionPtrAlignType());
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EXPECT_EQ(DataLayout::FunctionPtrAlignType::Independent, \
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DataLayout("Fi8").getFunctionPtrAlignType());
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EXPECT_EQ(DataLayout::FunctionPtrAlignType::MultipleOfFunctionAlign, \
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DataLayout("Fn8").getFunctionPtrAlignType());
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EXPECT_EQ(DataLayout("Fi8"), DataLayout("Fi8"));
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EXPECT_NE(DataLayout("Fi8"), DataLayout("Fi16"));
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EXPECT_NE(DataLayout("Fi8"), DataLayout("Fn8"));
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DataLayout a(""), b("Fi8"), c("Fn8");
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EXPECT_NE(a, b);
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EXPECT_NE(a, c);
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EXPECT_NE(b, c);
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a = b;
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EXPECT_EQ(a, b);
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a = c;
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EXPECT_EQ(a, c);
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}
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TEST(DataLayoutTest, ValueOrABITypeAlignment) {
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const DataLayout DL("Fi8");
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LLVMContext Context;
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Type *const FourByteAlignType = Type::getInt32Ty(Context);
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EXPECT_EQ(Align(16),
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DL.getValueOrABITypeAlignment(MaybeAlign(16), FourByteAlignType));
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EXPECT_EQ(Align(4),
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DL.getValueOrABITypeAlignment(MaybeAlign(), FourByteAlignType));
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}
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TEST(DataLayoutTest, GlobalsAddressSpace) {
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// When not explicitly defined the globals address space should be zero:
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EXPECT_EQ(DataLayout("").getDefaultGlobalsAddressSpace(), 0u);
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EXPECT_EQ(DataLayout("P1-A2").getDefaultGlobalsAddressSpace(), 0u);
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EXPECT_EQ(DataLayout("G2").getDefaultGlobalsAddressSpace(), 2u);
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// Check that creating a GlobalVariable without an explicit address space
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// in a module with a default globals address space respects that default:
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LLVMContext Context;
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std::unique_ptr<Module> M(new Module("MyModule", Context));
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// Default is globals in address space zero:
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auto *Int32 = Type::getInt32Ty(Context);
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auto *DefaultGlobal1 = new GlobalVariable(
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*M, Int32, false, GlobalValue::ExternalLinkage, nullptr);
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EXPECT_EQ(DefaultGlobal1->getAddressSpace(), 0u);
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auto *ExplicitGlobal1 = new GlobalVariable(
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*M, Int32, false, GlobalValue::ExternalLinkage, nullptr, "", nullptr,
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GlobalValue::NotThreadLocal, 123);
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EXPECT_EQ(ExplicitGlobal1->getAddressSpace(), 123u);
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// When using a datalayout with the global address space set to 200, global
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// variables should default to 200
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M->setDataLayout("G200");
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auto *DefaultGlobal2 = new GlobalVariable(
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*M, Int32, false, GlobalValue::ExternalLinkage, nullptr);
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EXPECT_EQ(DefaultGlobal2->getAddressSpace(), 200u);
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auto *ExplicitGlobal2 = new GlobalVariable(
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*M, Int32, false, GlobalValue::ExternalLinkage, nullptr, "", nullptr,
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GlobalValue::NotThreadLocal, 123);
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EXPECT_EQ(ExplicitGlobal2->getAddressSpace(), 123u);
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}
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TEST(DataLayoutTest, VectorAlign) {
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Expected<DataLayout> DL = DataLayout::parse("v64:64");
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EXPECT_THAT_EXPECTED(DL, Succeeded());
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LLVMContext Context;
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Type *const FloatTy = Type::getFloatTy(Context);
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Type *const V8F32Ty = FixedVectorType::get(FloatTy, 8);
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// The alignment for a vector type larger than any specified vector type uses
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// the natural alignment as a fallback.
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EXPECT_EQ(Align(4 * 8), DL->getABITypeAlign(V8F32Ty));
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EXPECT_EQ(Align(4 * 8), DL->getPrefTypeAlign(V8F32Ty));
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}
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} // anonymous namespace
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