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Utils: Simplify MapMetadata(), NFC

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Extract out the operand remapping loops, which are now very similar.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226515 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan P. N. Exon Smith 2015-01-19 22:44:32 +00:00
parent bc78e70ee0
commit 80cfed9fe7
1 changed files with 37 additions and 22 deletions
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59
lib/Transforms/Utils/ValueMapper.cpp
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@ -203,6 +203,40 @@ static TempUniquableMDNode cloneMDNode(const UniquableMDNode *Node) {
}
}
/// \brief Remap nodes.
///
/// Insert \c NewNode in the value map, and then remap \c OldNode's operands.
/// Assumes that \c NewNode is already a clone of \c OldNode.
///
/// \pre \c NewNode is a clone of \c OldNode.
static bool remap(const UniquableMDNode *OldNode, UniquableMDNode *NewNode,
ValueToValueMapTy &VM, RemapFlags Flags,
ValueMapTypeRemapper *TypeMapper,
ValueMaterializer *Materializer) {
assert(OldNode->getNumOperands() == NewNode->getNumOperands() &&
"Expected nodes to match");
assert(OldNode->isResolved() && "Expected resolved node");
assert(!NewNode->isUniqued() && "Expected non-uniqued node");
// Map the node upfront so it's available for cyclic references.
mapToMetadata(VM, OldNode, NewNode);
bool AnyChanged = false;
for (unsigned I = 0, E = OldNode->getNumOperands(); I != E; ++I) {
Metadata *Old = OldNode->getOperand(I);
assert(NewNode->getOperand(I) == Old &&
"Expected old operands to already be in place");
Metadata *New = mapMetadataOp(OldNode->getOperand(I), VM, Flags, TypeMapper,
Materializer);
if (Old != New) {
AnyChanged = true;
NewNode->replaceOperandWith(I, New);
}
}
return AnyChanged;
}
/// \brief Map a distinct MDNode.
///
/// Distinct nodes are not uniqued, so they must always recreated.
@ -212,15 +246,8 @@ static Metadata *mapDistinctNode(const UniquableMDNode *Node,
ValueMaterializer *Materializer) {
assert(Node->isDistinct() && "Expected distinct node");
// Create the node first so it's available for cyclical references.
UniquableMDNode *NewMD = MDNode::replaceWithDistinct(cloneMDNode(Node));
mapToMetadata(VM, Node, NewMD);
// Fix the operands.
for (unsigned I = 0, E = Node->getNumOperands(); I != E; ++I)
NewMD->replaceOperandWith(I, mapMetadataOp(Node->getOperand(I), VM, Flags,
TypeMapper, Materializer));
remap(Node, NewMD, VM, Flags, TypeMapper, Materializer);
return NewMD;
}
@ -235,21 +262,9 @@ static Metadata *mapUniquedNode(const UniquableMDNode *Node,
// Create a temporary node upfront in case we have a metadata cycle.
auto ClonedMD = cloneMDNode(Node);
mapToMetadata(VM, Node, ClonedMD.get());
// Remap the operands, keeping track of whether any changed.
bool AnyChanged = false;
for (unsigned I = 0, E = Node->getNumOperands(); I != E; ++I) {
Metadata *Old = Node->getOperand(I);
Metadata *New = mapMetadataOp(Old, VM, Flags, TypeMapper, Materializer);
if (Old != New) {
ClonedMD->replaceOperandWith(I, New);
AnyChanged = true;
}
}
if (!AnyChanged)
// Use an identity mapping.
if (!remap(Node, ClonedMD.get(), VM, Flags, TypeMapper, Materializer))
// No operands changed, so use the identity mapping.
return mapToSelf(VM, Node);
// At least one operand has changed, so uniquify the cloned node.