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TypeLegalizer: Fix a bug in the promotion of elements of integer vectors.

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(only happens when using the -promote-elements option).

The correct legalization order is to first try to promote element. Next, we try
to widen vectors.





git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132648 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem 2011-06-04 20:32:01 +00:00
parent 9fa89334f1
commit f1c025d1d1
1 changed files with 22 additions and 16 deletions
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38
lib/CodeGen/SelectionDAG/TargetLowering.cpp
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@ -821,26 +821,32 @@ void TargetLowering::computeRegisterProperties() {
unsigned NElts = VT.getVectorNumElements();
if (NElts != 1) {
bool IsLegalWiderType = false;
// If we allow the promotion of vector elements using a flag,
// then return TypePromoteInteger on vector elements.
// First try to promote the elements of integer vectors. If no legal
// promotion was found, fallback to the widen-vector method.
if (mayPromoteElements)
for (unsigned nVT = i+1; nVT <= MVT::LAST_VECTOR_VALUETYPE; ++nVT) {
EVT SVT = (MVT::SimpleValueType)nVT;
// If we allow the promotion of vector elements using a flag,
// then return TypePromoteInteger on vector elements.
if (mayPromoteElements) {
// Promote vectors of integers to vectors with the same number
// of elements, with a wider element type.
if (SVT.getVectorElementType().getSizeInBits() > EltVT.getSizeInBits()
&& SVT.getVectorNumElements() == NElts &&
isTypeLegal(SVT) && SVT.getScalarType().isInteger()) {
TransformToType[i] = SVT;
RegisterTypeForVT[i] = SVT;
NumRegistersForVT[i] = 1;
ValueTypeActions.setTypeAction(VT, TypePromoteInteger);
IsLegalWiderType = true;
break;
}
// Promote vectors of integers to vectors with the same number
// of elements, with a wider element type.
if (SVT.getVectorElementType().getSizeInBits() > EltVT.getSizeInBits()
&& SVT.getVectorNumElements() == NElts &&
isTypeLegal(SVT) && SVT.getScalarType().isInteger()) {
TransformToType[i] = SVT;
RegisterTypeForVT[i] = SVT;
NumRegistersForVT[i] = 1;
ValueTypeActions.setTypeAction(VT, TypePromoteInteger);
IsLegalWiderType = true;
break;
}
}
if (IsLegalWiderType) continue;
// Try to widen the vector.
for (unsigned nVT = i+1; nVT <= MVT::LAST_VECTOR_VALUETYPE; ++nVT) {
EVT SVT = (MVT::SimpleValueType)nVT;
if (SVT.getVectorElementType() == EltVT &&
SVT.getVectorNumElements() > NElts &&
isTypeLegal(SVT)) {