05392466f0
Currently the max alignment representable is 1GB, see D108661. Setting the align of an object to 4GB is desirable in some cases to make sure the lower 32 bits are clear which can be used for some optimizations, e.g. https://crbug.com/1016945. This uses an extra bit in instructions that carry an alignment. We can store 15 bits of "free" information, and with this change some instructions (e.g. AtomicCmpXchgInst) use 14 bits. We can increase the max alignment representable above 4GB (up to 2^62) since we're only using 33 of the 64 values, but I've just limited it to 4GB for now. The one place we have to update the bitcode format is for the alloca instruction. It stores its alignment into 5 bits of a 32 bit bitfield. I've added another field which is 8 bits and should be future proof for a while. For backward compatibility, we check if the old field has a value and use that, otherwise use the new field. Updating clang's max allowed alignment will come in a future patch. Reviewed By: hans Differential Revision: https://reviews.llvm.org/D110451
316 lines
12 KiB
C++
316 lines
12 KiB
C++
//===- llvm/unittest/IR/ValueTest.cpp - Value unit 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/Value.h"
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#include "llvm/AsmParser/Parser.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/IntrinsicInst.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/ModuleSlotTracker.h"
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#include "llvm/Support/SourceMgr.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(ValueTest, UsedInBasicBlock) {
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LLVMContext C;
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const char *ModuleString = "define void @f(i32 %x, i32 %y) {\n"
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"bb0:\n"
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" %y1 = add i32 %y, 1\n"
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" %y2 = add i32 %y, 1\n"
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" %y3 = add i32 %y, 1\n"
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" %y4 = add i32 %y, 1\n"
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" %y5 = add i32 %y, 1\n"
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" %y6 = add i32 %y, 1\n"
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" %y7 = add i32 %y, 1\n"
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" %y8 = add i32 %x, 1\n"
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" ret void\n"
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"}\n";
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SMDiagnostic Err;
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std::unique_ptr<Module> M = parseAssemblyString(ModuleString, Err, C);
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Function *F = M->getFunction("f");
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EXPECT_FALSE(F->isUsedInBasicBlock(&F->front()));
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EXPECT_TRUE(std::next(F->arg_begin())->isUsedInBasicBlock(&F->front()));
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EXPECT_TRUE(F->arg_begin()->isUsedInBasicBlock(&F->front()));
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}
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TEST(GlobalTest, CreateAddressSpace) {
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LLVMContext Ctx;
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std::unique_ptr<Module> M(new Module("TestModule", Ctx));
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Type *Int8Ty = Type::getInt8Ty(Ctx);
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Type *Int32Ty = Type::getInt32Ty(Ctx);
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GlobalVariable *Dummy0
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= new GlobalVariable(*M,
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Int32Ty,
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true,
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GlobalValue::ExternalLinkage,
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Constant::getAllOnesValue(Int32Ty),
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"dummy",
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nullptr,
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GlobalVariable::NotThreadLocal,
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1);
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EXPECT_TRUE(Value::MaximumAlignment == 4294967296ULL);
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Dummy0->setAlignment(Align(4294967296ULL));
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EXPECT_EQ(Dummy0->getAlignment(), 4294967296ULL);
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// Make sure the address space isn't dropped when returning this.
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Constant *Dummy1 = M->getOrInsertGlobal("dummy", Int32Ty);
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EXPECT_EQ(Dummy0, Dummy1);
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EXPECT_EQ(1u, Dummy1->getType()->getPointerAddressSpace());
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// This one requires a bitcast, but the address space must also stay the same.
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GlobalVariable *DummyCast0
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= new GlobalVariable(*M,
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Int32Ty,
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true,
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GlobalValue::ExternalLinkage,
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Constant::getAllOnesValue(Int32Ty),
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"dummy_cast",
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nullptr,
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GlobalVariable::NotThreadLocal,
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1);
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// Make sure the address space isn't dropped when returning this.
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Constant *DummyCast1 = M->getOrInsertGlobal("dummy_cast", Int8Ty);
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EXPECT_EQ(1u, DummyCast1->getType()->getPointerAddressSpace());
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EXPECT_NE(DummyCast0, DummyCast1) << *DummyCast1;
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}
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#ifdef GTEST_HAS_DEATH_TEST
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#ifndef NDEBUG
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TEST(GlobalTest, AlignDeath) {
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LLVMContext Ctx;
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std::unique_ptr<Module> M(new Module("TestModule", Ctx));
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Type *Int32Ty = Type::getInt32Ty(Ctx);
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GlobalVariable *Var =
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new GlobalVariable(*M, Int32Ty, true, GlobalValue::ExternalLinkage,
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Constant::getAllOnesValue(Int32Ty), "var", nullptr,
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GlobalVariable::NotThreadLocal, 1);
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EXPECT_DEATH(Var->setAlignment(Align(8589934592ULL)),
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"Alignment is greater than MaximumAlignment");
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}
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#endif
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#endif
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TEST(ValueTest, printSlots) {
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// Check that Value::print() and Value::printAsOperand() work with and
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// without a slot tracker.
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LLVMContext C;
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const char *ModuleString = "@g0 = external global %500\n"
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"@g1 = external global %900\n"
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"\n"
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"%900 = type { i32, i32 }\n"
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"%500 = type { i32 }\n"
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"\n"
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"define void @f(i32 %x, i32 %y) {\n"
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"entry:\n"
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" %0 = add i32 %y, 1\n"
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" %1 = add i32 %y, 1\n"
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" ret void\n"
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"}\n";
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SMDiagnostic Err;
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std::unique_ptr<Module> M = parseAssemblyString(ModuleString, Err, C);
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Function *F = M->getFunction("f");
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ASSERT_TRUE(F);
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ASSERT_FALSE(F->empty());
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BasicBlock &BB = F->getEntryBlock();
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ASSERT_EQ(3u, BB.size());
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Instruction *I0 = &*BB.begin();
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ASSERT_TRUE(I0);
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Instruction *I1 = &*++BB.begin();
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ASSERT_TRUE(I1);
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GlobalVariable *G0 = M->getGlobalVariable("g0");
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ASSERT_TRUE(G0);
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GlobalVariable *G1 = M->getGlobalVariable("g1");
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ASSERT_TRUE(G1);
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ModuleSlotTracker MST(M.get());
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#define CHECK_PRINT(INST, STR) \
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do { \
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{ \
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std::string S; \
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raw_string_ostream OS(S); \
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INST->print(OS); \
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EXPECT_EQ(STR, OS.str()); \
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} \
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{ \
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std::string S; \
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raw_string_ostream OS(S); \
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INST->print(OS, MST); \
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EXPECT_EQ(STR, OS.str()); \
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} \
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} while (false)
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CHECK_PRINT(I0, " %0 = add i32 %y, 1");
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CHECK_PRINT(I1, " %1 = add i32 %y, 1");
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#undef CHECK_PRINT
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#define CHECK_PRINT_AS_OPERAND(INST, TYPE, STR) \
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do { \
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{ \
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std::string S; \
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raw_string_ostream OS(S); \
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INST->printAsOperand(OS, TYPE); \
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EXPECT_EQ(StringRef(STR), StringRef(OS.str())); \
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} \
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{ \
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std::string S; \
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raw_string_ostream OS(S); \
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INST->printAsOperand(OS, TYPE, MST); \
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EXPECT_EQ(StringRef(STR), StringRef(OS.str())); \
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} \
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} while (false)
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CHECK_PRINT_AS_OPERAND(I0, false, "%0");
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CHECK_PRINT_AS_OPERAND(I1, false, "%1");
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CHECK_PRINT_AS_OPERAND(I0, true, "i32 %0");
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CHECK_PRINT_AS_OPERAND(I1, true, "i32 %1");
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CHECK_PRINT_AS_OPERAND(G0, true, "%0* @g0");
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CHECK_PRINT_AS_OPERAND(G1, true, "%1* @g1");
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#undef CHECK_PRINT_AS_OPERAND
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}
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TEST(ValueTest, getLocalSlots) {
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// Verify that the getLocalSlot method returns the correct slot numbers.
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LLVMContext C;
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const char *ModuleString = "define void @f(i32 %x, i32 %y) {\n"
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"entry:\n"
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" %0 = add i32 %y, 1\n"
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" %1 = add i32 %y, 1\n"
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" br label %2\n"
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"\n"
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" ret void\n"
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"}\n";
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SMDiagnostic Err;
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std::unique_ptr<Module> M = parseAssemblyString(ModuleString, Err, C);
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Function *F = M->getFunction("f");
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ASSERT_TRUE(F);
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ASSERT_FALSE(F->empty());
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BasicBlock &EntryBB = F->getEntryBlock();
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ASSERT_EQ(3u, EntryBB.size());
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BasicBlock *BB2 = &*++F->begin();
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ASSERT_TRUE(BB2);
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Instruction *I0 = &*EntryBB.begin();
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ASSERT_TRUE(I0);
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Instruction *I1 = &*++EntryBB.begin();
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ASSERT_TRUE(I1);
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ModuleSlotTracker MST(M.get());
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MST.incorporateFunction(*F);
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EXPECT_EQ(MST.getLocalSlot(I0), 0);
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EXPECT_EQ(MST.getLocalSlot(I1), 1);
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EXPECT_EQ(MST.getLocalSlot(&EntryBB), -1);
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EXPECT_EQ(MST.getLocalSlot(BB2), 2);
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}
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#if defined(GTEST_HAS_DEATH_TEST) && !defined(NDEBUG)
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TEST(ValueTest, getLocalSlotDeath) {
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LLVMContext C;
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const char *ModuleString = "define void @f(i32 %x, i32 %y) {\n"
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"entry:\n"
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" %0 = add i32 %y, 1\n"
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" %1 = add i32 %y, 1\n"
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" br label %2\n"
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"\n"
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" ret void\n"
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"}\n";
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SMDiagnostic Err;
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std::unique_ptr<Module> M = parseAssemblyString(ModuleString, Err, C);
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Function *F = M->getFunction("f");
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ASSERT_TRUE(F);
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ASSERT_FALSE(F->empty());
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BasicBlock *BB2 = &*++F->begin();
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ASSERT_TRUE(BB2);
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ModuleSlotTracker MST(M.get());
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EXPECT_DEATH(MST.getLocalSlot(BB2), "No function incorporated");
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}
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#endif
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TEST(ValueTest, replaceUsesOutsideBlock) {
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// Check that Value::replaceUsesOutsideBlock(New, BB) replaces uses outside
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// BB, including dbg.* uses of MetadataAsValue(ValueAsMetadata(this)).
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const auto *IR = R"(
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define i32 @f() !dbg !6 {
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entry:
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%a = add i32 0, 1, !dbg !15
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%b = add i32 0, 2, !dbg !15
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%c = add i32 %a, 2, !dbg !15
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call void @llvm.dbg.value(metadata i32 %a, metadata !9, metadata !DIExpression()), !dbg !15
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br label %exit, !dbg !15
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exit:
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call void @llvm.dbg.value(metadata i32 %a, metadata !11, metadata !DIExpression()), !dbg !16
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ret i32 %a, !dbg !16
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}
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!5}
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!0 = distinct !DICompileUnit(language: DW_LANG_C, file: !1, producer: "debugify", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "test.ll", directory: "/")
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!2 = !{}
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!5 = !{i32 2, !"Debug Info Version", i32 3}
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!6 = distinct !DISubprogram(name: "f", linkageName: "f", scope: null, file: !1, line: 1, type: !7, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: true, unit: !0, retainedNodes: !8)
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!7 = !DISubroutineType(types: !2)
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!8 = !{!9, !11}
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!9 = !DILocalVariable(name: "1", scope: !6, file: !1, line: 1, type: !10)
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!10 = !DIBasicType(name: "ty32", size: 32, encoding: DW_ATE_signed)
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!11 = !DILocalVariable(name: "2", scope: !6, file: !1, line: 2, type: !12)
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!12 = !DIBasicType(name: "ty64", size: 64, encoding: DW_ATE_signed)
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!15 = !DILocation(line: 1, column: 1, scope: !6)
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!16 = !DILocation(line: 5, column: 1, scope: !6)
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)";
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LLVMContext Ctx;
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SMDiagnostic Err;
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std::unique_ptr<Module> M = parseAssemblyString(IR, Err, Ctx);
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if (!M)
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Err.print("ValueTest", errs());
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auto GetNext = [](auto *I) { return &*++I->getIterator(); };
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Function *F = M->getFunction("f");
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// Entry.
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BasicBlock *Entry = &F->front();
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Instruction *A = &Entry->front();
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Instruction *B = GetNext(A);
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Instruction *C = GetNext(B);
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auto *EntryDbg = cast<DbgValueInst>(GetNext(C));
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// Exit.
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BasicBlock *Exit = GetNext(Entry);
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auto *ExitDbg = cast<DbgValueInst>(&Exit->front());
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Instruction *Ret = GetNext(ExitDbg);
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A->replaceUsesOutsideBlock(B, Entry);
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// These users are in Entry so shouldn't be changed.
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ASSERT_TRUE(C->getOperand(0) == cast<Value>(A));
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ASSERT_TRUE(EntryDbg->getValue(0) == cast<Value>(A));
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// These users are outside Entry so should be changed.
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ASSERT_TRUE(ExitDbg->getValue(0) == cast<Value>(B));
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ASSERT_TRUE(Ret->getOperand(0) == cast<Value>(B));
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}
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} // end anonymous namespace
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