llvm-6502/lib/IR/MDBuilder.cpp
Charles Davis fba7e30f0f [IC] Turn non-null MD on pointer loads to range MD on integer loads.
Summary:
This change fixes the FIXME that you recently added when you committed
(a modified version of) my patch.  When `InstCombine` combines a load and
store of an pointer to those of an equivalently-sized integer, it currently
drops any `!nonnull` metadata that might be present.  This change replaces
`!nonnull` metadata with `!range !{ 1, -1 }` metadata instead.

Reviewers: chandlerc

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D7621

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230462 91177308-0d34-0410-b5e6-96231b3b80d8
2015-02-25 05:10:25 +00:00

167 lines
6.0 KiB
C++

//===---- llvm/MDBuilder.cpp - Builder for LLVM metadata ------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the MDBuilder class, which is used as a convenient way to
// create LLVM metadata with a consistent and simplified interface.
//
//===----------------------------------------------------------------------===//
#include "llvm/IR/MDBuilder.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/Metadata.h"
using namespace llvm;
MDString *MDBuilder::createString(StringRef Str) {
return MDString::get(Context, Str);
}
ConstantAsMetadata *MDBuilder::createConstant(Constant *C) {
return ConstantAsMetadata::get(C);
}
MDNode *MDBuilder::createFPMath(float Accuracy) {
if (Accuracy == 0.0)
return nullptr;
assert(Accuracy > 0.0 && "Invalid fpmath accuracy!");
auto *Op =
createConstant(ConstantFP::get(Type::getFloatTy(Context), Accuracy));
return MDNode::get(Context, Op);
}
MDNode *MDBuilder::createBranchWeights(uint32_t TrueWeight,
uint32_t FalseWeight) {
uint32_t Weights[] = {TrueWeight, FalseWeight};
return createBranchWeights(Weights);
}
MDNode *MDBuilder::createBranchWeights(ArrayRef<uint32_t> Weights) {
assert(Weights.size() >= 2 && "Need at least two branch weights!");
SmallVector<Metadata *, 4> Vals(Weights.size() + 1);
Vals[0] = createString("branch_weights");
Type *Int32Ty = Type::getInt32Ty(Context);
for (unsigned i = 0, e = Weights.size(); i != e; ++i)
Vals[i + 1] = createConstant(ConstantInt::get(Int32Ty, Weights[i]));
return MDNode::get(Context, Vals);
}
MDNode *MDBuilder::createRange(const APInt &Lo, const APInt &Hi) {
assert(Lo.getBitWidth() == Hi.getBitWidth() && "Mismatched bitwidths!");
Type *Ty = IntegerType::get(Context, Lo.getBitWidth());
return createRange(ConstantInt::get(Ty, Lo), ConstantInt::get(Ty, Hi));
}
MDNode *MDBuilder::createRange(Constant *Lo, Constant *Hi) {
// If the range is everything then it is useless.
if (Hi == Lo)
return nullptr;
// Return the range [Lo, Hi).
Metadata *Range[2] = {createConstant(Lo), createConstant(Hi)};
return MDNode::get(Context, Range);
}
MDNode *MDBuilder::createAnonymousAARoot(StringRef Name, MDNode *Extra) {
// To ensure uniqueness the root node is self-referential.
auto Dummy = MDNode::getTemporary(Context, None);
SmallVector<Metadata *, 3> Args(1, Dummy.get());
if (Extra)
Args.push_back(Extra);
if (!Name.empty())
Args.push_back(createString(Name));
MDNode *Root = MDNode::get(Context, Args);
// At this point we have
// !0 = metadata !{} <- dummy
// !1 = metadata !{metadata !0} <- root
// Replace the dummy operand with the root node itself and delete the dummy.
Root->replaceOperandWith(0, Root);
// We now have
// !1 = metadata !{metadata !1} <- self-referential root
return Root;
}
MDNode *MDBuilder::createTBAARoot(StringRef Name) {
return MDNode::get(Context, createString(Name));
}
/// \brief Return metadata for a non-root TBAA node with the given name,
/// parent in the TBAA tree, and value for 'pointsToConstantMemory'.
MDNode *MDBuilder::createTBAANode(StringRef Name, MDNode *Parent,
bool isConstant) {
if (isConstant) {
Constant *Flags = ConstantInt::get(Type::getInt64Ty(Context), 1);
Metadata *Ops[3] = {createString(Name), Parent, createConstant(Flags)};
return MDNode::get(Context, Ops);
} else {
Metadata *Ops[2] = {createString(Name), Parent};
return MDNode::get(Context, Ops);
}
}
MDNode *MDBuilder::createAliasScopeDomain(StringRef Name) {
return MDNode::get(Context, createString(Name));
}
MDNode *MDBuilder::createAliasScope(StringRef Name, MDNode *Domain) {
Metadata *Ops[2] = {createString(Name), Domain};
return MDNode::get(Context, Ops);
}
/// \brief Return metadata for a tbaa.struct node with the given
/// struct field descriptions.
MDNode *MDBuilder::createTBAAStructNode(ArrayRef<TBAAStructField> Fields) {
SmallVector<Metadata *, 4> Vals(Fields.size() * 3);
Type *Int64 = Type::getInt64Ty(Context);
for (unsigned i = 0, e = Fields.size(); i != e; ++i) {
Vals[i * 3 + 0] = createConstant(ConstantInt::get(Int64, Fields[i].Offset));
Vals[i * 3 + 1] = createConstant(ConstantInt::get(Int64, Fields[i].Size));
Vals[i * 3 + 2] = Fields[i].TBAA;
}
return MDNode::get(Context, Vals);
}
/// \brief Return metadata for a TBAA struct node in the type DAG
/// with the given name, a list of pairs (offset, field type in the type DAG).
MDNode *MDBuilder::createTBAAStructTypeNode(
StringRef Name, ArrayRef<std::pair<MDNode *, uint64_t>> Fields) {
SmallVector<Metadata *, 4> Ops(Fields.size() * 2 + 1);
Type *Int64 = Type::getInt64Ty(Context);
Ops[0] = createString(Name);
for (unsigned i = 0, e = Fields.size(); i != e; ++i) {
Ops[i * 2 + 1] = Fields[i].first;
Ops[i * 2 + 2] = createConstant(ConstantInt::get(Int64, Fields[i].second));
}
return MDNode::get(Context, Ops);
}
/// \brief Return metadata for a TBAA scalar type node with the
/// given name, an offset and a parent in the TBAA type DAG.
MDNode *MDBuilder::createTBAAScalarTypeNode(StringRef Name, MDNode *Parent,
uint64_t Offset) {
ConstantInt *Off = ConstantInt::get(Type::getInt64Ty(Context), Offset);
Metadata *Ops[3] = {createString(Name), Parent, createConstant(Off)};
return MDNode::get(Context, Ops);
}
/// \brief Return metadata for a TBAA tag node with the given
/// base type, access type and offset relative to the base type.
MDNode *MDBuilder::createTBAAStructTagNode(MDNode *BaseType, MDNode *AccessType,
uint64_t Offset) {
Type *Int64 = Type::getInt64Ty(Context);
Metadata *Ops[3] = {BaseType, AccessType,
createConstant(ConstantInt::get(Int64, Offset))};
return MDNode::get(Context, Ops);
}