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Add a CoveringSubRegIndices field to SubRegIndex records.

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This can be used to tell TableGen to use a specific SubRegIndex instead
of synthesizing one when discovering all sub-registers.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161982 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2012-08-15 20:15:48 +00:00
parent 3651e7dfec
commit d024a20bf7
2 changed files with 40 additions and 9 deletions
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18
include/llvm/Target/Target.td
View File

@ -28,6 +28,24 @@ class SubRegIndex<list<SubRegIndex> comps = []> {
// ComposedOf - A list of two SubRegIndex instances, [A, B].
// This indicates that this SubRegIndex is the result of composing A and B.
list<SubRegIndex> ComposedOf = comps;
// CoveringSubRegIndices - A list of two or more sub-register indexes that
// cover this sub-register.
//
// This field should normally be left blank as TableGen can infer it.
//
// TableGen automatically detects sub-registers that straddle the registers
// in the SubRegs field of a Register definition. For example:
//
// Q0 = dsub_0 -> D0, dsub_1 -> D1
// Q1 = dsub_0 -> D2, dsub_1 -> D3
// D1_D2 = dsub_0 -> D1, dsub_1 -> D2
// QQ0 = qsub_0 -> Q0, qsub_1 -> Q1
//
// TableGen will infer that D1_D2 is a sub-register of QQ0. It will be given
// the synthetic index dsub_1_dsub_2 unless some SubRegIndex is defined with
// CoveringSubRegIndices = [dsub_1, dsub_2].
list<SubRegIndex> CoveringSubRegIndices = [];
}
// RegAltNameIndex - The alternate name set to use for register operands of

31
utils/TableGen/CodeGenRegisters.cpp
View File

@ -50,16 +50,29 @@ std::string CodeGenSubRegIndex::getQualifiedName() const {
void CodeGenSubRegIndex::updateComponents(CodeGenRegBank &RegBank) {
if (!TheDef)
return;
std::vector<Record*> Comps = TheDef->getValueAsListOfDefs("ComposedOf");
if (Comps.empty())
return;
if (Comps.size() != 2)
throw TGError(TheDef->getLoc(), "ComposedOf must have exactly two entries");
CodeGenSubRegIndex *A = RegBank.getSubRegIdx(Comps[0]);
CodeGenSubRegIndex *B = RegBank.getSubRegIdx(Comps[1]);
CodeGenSubRegIndex *X = A->addComposite(B, this);
if (X)
throw TGError(TheDef->getLoc(), "Ambiguous ComposedOf entries");
if (!Comps.empty()) {
if (Comps.size() != 2)
throw TGError(TheDef->getLoc(), "ComposedOf must have exactly two entries");
CodeGenSubRegIndex *A = RegBank.getSubRegIdx(Comps[0]);
CodeGenSubRegIndex *B = RegBank.getSubRegIdx(Comps[1]);
CodeGenSubRegIndex *X = A->addComposite(B, this);
if (X)
throw TGError(TheDef->getLoc(), "Ambiguous ComposedOf entries");
}
std::vector<Record*> Parts =
TheDef->getValueAsListOfDefs("CoveringSubRegIndices");
if (!Parts.empty()) {
if (Parts.size() < 2)
throw TGError(TheDef->getLoc(),
"CoveredBySubRegs must have two or more entries");
SmallVector<CodeGenSubRegIndex*, 8> IdxParts;
for (unsigned i = 0, e = Parts.size(); i != e; ++i)
IdxParts.push_back(RegBank.getSubRegIdx(Parts[i]));
RegBank.addConcatSubRegIndex(IdxParts, this);
}
}
void CodeGenSubRegIndex::cleanComposites() {