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Refactor getActionType and getTypeToTransformTo ; place all of the 'decision'

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code in one place. Re-apply 131534 and fix the multi-step promotion of integers.

llvm-svn: 132217
This commit is contained in:
Nadav Rotem 2011-05-27 21:03:13 +00:00
parent fe707571fc
commit 531aa71d22
5 changed files with 84 additions and 92 deletions
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164
include/llvm/Target/TargetLowering.h
View File

@ -204,62 +204,11 @@ public:
/// that indicates how instruction selection should deal with the type.
uint8_t ValueTypeActions[MVT::LAST_VALUETYPE];
LegalizeAction getExtendedTypeAction(EVT VT) const {
// Handle non-vector integers.
if (!VT.isVector()) {
assert(VT.isInteger() && "Unsupported extended type!");
unsigned BitSize = VT.getSizeInBits();
// First promote to a power-of-two size, then expand if necessary.
if (BitSize < 8 || !isPowerOf2_32(BitSize))
return Promote;
return Expand;
}
// Vectors with only one element are always scalarized.
if (VT.getVectorNumElements() == 1)
return Expand;
// Vectors with a number of elements that is not a power of two are always
// widened, for example <3 x float> -> <4 x float>.
if (!VT.isPow2VectorType())
return Promote;
// Vectors with a crazy element type are always expanded, for example
// <4 x i2> is expanded into two vectors of type <2 x i2>.
if (!VT.getVectorElementType().isSimple())
return Expand;
// If this type is smaller than a legal vector type then widen it,
// otherwise expand it. E.g. <2 x float> -> <4 x float>.
MVT EltType = VT.getVectorElementType().getSimpleVT();
unsigned NumElts = VT.getVectorNumElements();
while (1) {
// Round up to the next power of 2.
NumElts = (unsigned)NextPowerOf2(NumElts);
// If there is no simple vector type with this many elements then there
// cannot be a larger legal vector type. Note that this assumes that
// there are no skipped intermediate vector types in the simple types.
MVT LargerVector = MVT::getVectorVT(EltType, NumElts);
if (LargerVector == MVT())
return Expand;
// If this type is legal then widen the vector.
if (getTypeAction(LargerVector) == Legal)
return Promote;
}
}
public:
ValueTypeActionImpl() {
std::fill(ValueTypeActions, array_endof(ValueTypeActions), 0);
}
LegalizeAction getTypeAction(EVT VT) const {
if (!VT.isExtended())
return getTypeAction(VT.getSimpleVT());
return getExtendedTypeAction(VT);
}
LegalizeAction getTypeAction(MVT VT) const {
return (LegalizeAction)ValueTypeActions[VT.SimpleTy];
}
@ -278,8 +227,8 @@ public:
/// it is already legal (return 'Legal') or we need to promote it to a larger
/// type (return 'Promote'), or we need to expand it into multiple registers
/// of smaller integer type (return 'Expand'). 'Custom' is not an option.
LegalizeAction getTypeAction(EVT VT) const {
return ValueTypeActions.getTypeAction(VT);
LegalizeAction getTypeAction(LLVMContext &Context, EVT VT) const {
return getTypeConversion(Context, VT).first;
}
LegalizeAction getTypeAction(MVT VT) const {
return ValueTypeActions.getTypeAction(VT);
@ -292,38 +241,7 @@ public:
/// to get to the smaller register. For illegal floating point types, this
/// returns the integer type to transform to.
EVT getTypeToTransformTo(LLVMContext &Context, EVT VT) const {
if (VT.isSimple()) {
assert((unsigned)VT.getSimpleVT().SimpleTy <
array_lengthof(TransformToType));
EVT NVT = TransformToType[VT.getSimpleVT().SimpleTy];
assert(getTypeAction(NVT) != Promote &&
"Promote may not follow Expand or Promote");
return NVT;
}
if (VT.isVector()) {
EVT NVT = VT.getPow2VectorType(Context);
if (NVT == VT) {
// Vector length is a power of 2 - split to half the size.
unsigned NumElts = VT.getVectorNumElements();
EVT EltVT = VT.getVectorElementType();
return (NumElts == 1) ?
EltVT : EVT::getVectorVT(Context, EltVT, NumElts / 2);
}
// Promote to a power of two size, avoiding multi-step promotion.
return getTypeAction(NVT) == Promote ?
getTypeToTransformTo(Context, NVT) : NVT;
} else if (VT.isInteger()) {
EVT NVT = VT.getRoundIntegerType(Context);
if (NVT == VT) // Size is a power of two - expand to half the size.
return EVT::getIntegerVT(Context, VT.getSizeInBits() / 2);
// Promote to a power of two size, avoiding multi-step promotion.
return getTypeAction(NVT) == Promote ?
getTypeToTransformTo(Context, NVT) : NVT;
}
assert(0 && "Unsupported extended type!");
return MVT(MVT::Other); // Not reached
return getTypeConversion(Context, VT).second;
}
/// getTypeToExpandTo - For types supported by the target, this is an
@ -333,7 +251,7 @@ public:
EVT getTypeToExpandTo(LLVMContext &Context, EVT VT) const {
assert(!VT.isVector());
while (true) {
switch (getTypeAction(VT)) {
switch (getTypeAction(Context, VT)) {
case Legal:
return VT;
case Expand:
@ -1814,6 +1732,80 @@ private:
ValueTypeActionImpl ValueTypeActions;
typedef std::pair<LegalizeAction, EVT> LegalizeKind;
LegalizeKind
getTypeConversion(LLVMContext &Context, EVT VT) const {
// If this is a simple type, use the ComputeRegisterProp mechanism.
if (VT.isSimple()) {
assert((unsigned)VT.getSimpleVT().SimpleTy <
array_lengthof(TransformToType));
EVT NVT = TransformToType[VT.getSimpleVT().SimpleTy];
LegalizeAction LA = ValueTypeActions.getTypeAction(VT.getSimpleVT());
if (NVT.isSimple() && LA != Legal)
assert(ValueTypeActions.getTypeAction(NVT.getSimpleVT()) != Promote &&
"Promote may not follow Expand or Promote");
return LegalizeKind(LA, NVT);
}
// Handle Extended Scalar Types.
if (!VT.isVector()) {
assert(VT.isInteger() && "Float types must be simple");
unsigned BitSize = VT.getSizeInBits();
// First promote to a power-of-two size, then expand if necessary.
if (BitSize < 8 || !isPowerOf2_32(BitSize)) {
EVT NVT = VT.getRoundIntegerType(Context);
assert(NVT != VT && "Unable to round integer VT");
LegalizeKind NextStep = getTypeConversion(Context, NVT);
// Avoid multi-step promotion.
if (NextStep.first == Promote) return NextStep;
// Return rounded integer type.
return LegalizeKind(Promote, NVT);
}
return LegalizeKind(Expand,
EVT::getIntegerVT(Context, VT.getSizeInBits()/2));
}
// Handle vector types.
unsigned NumElts = VT.getVectorNumElements();
EVT EltVT = VT.getVectorElementType();
// Vectors with only one element are always scalarized.
if (NumElts == 1)
return LegalizeKind(Expand, EltVT);
// Try to widen the vector until a legal type is found.
// If there is no wider legal type, split the vector.
while (1) {
// Round up to the next power of 2.
NumElts = (unsigned)NextPowerOf2(NumElts);
// If there is no simple vector type with this many elements then there
// cannot be a larger legal vector type. Note that this assumes that
// there are no skipped intermediate vector types in the simple types.
MVT LargerVector = MVT::getVectorVT(EltVT.getSimpleVT(), NumElts);
if (LargerVector == MVT()) break;
// If this type is legal then widen the vector.
if (ValueTypeActions.getTypeAction(LargerVector) == Legal)
return LegalizeKind(Promote, LargerVector);
}
// Widen odd vectors to next power of two.
if (!VT.isPow2VectorType()) {
EVT NVT = VT.getPow2VectorType(Context);
return LegalizeKind(Promote, NVT);
}
// Vectors with illegal element types are expanded.
EVT NVT = EVT::getVectorVT(Context, EltVT, VT.getVectorNumElements() / 2);
return LegalizeKind(Expand, NVT);
assert(false && "Unable to handle this kind of vector type");
return LegalizeKind(Legal, VT);
}
std::vector<std::pair<EVT, TargetRegisterClass*> > AvailableRegClasses;
/// TargetDAGCombineArray - Targets can specify ISD nodes that they would

2
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
View File

@ -91,7 +91,7 @@ public:
/// it is already legal or we need to expand it into multiple registers of
/// smaller integer type, or we need to promote it to a larger type.
LegalizeAction getTypeAction(EVT VT) const {
return (LegalizeAction)ValueTypeActions.getTypeAction(VT);
return (LegalizeAction)TLI.getTypeAction(*DAG.getContext(), VT);
}
/// isTypeLegal - Return true if this type is legal on this target.

4
lib/CodeGen/SelectionDAG/LegalizeTypes.h
View File

@ -75,7 +75,7 @@ private:
/// getTypeAction - Return how we should legalize values of this type.
LegalizeAction getTypeAction(EVT VT) const {
switch (ValueTypeActions.getTypeAction(VT)) {
switch (TLI.getTypeAction(*DAG.getContext(), VT)) {
default:
assert(false && "Unknown legalize action!");
case TargetLowering::Legal:
@ -108,7 +108,7 @@ private:
/// isTypeLegal - Return true if this type is legal on this target.
bool isTypeLegal(EVT VT) const {
return ValueTypeActions.getTypeAction(VT) == TargetLowering::Legal;
return TLI.getTypeAction(*DAG.getContext(), VT) == TargetLowering::Legal;
}
/// IgnoreNodeResults - Pretend all of this node's results are legal.

2
lib/CodeGen/SelectionDAG/TargetLowering.cpp
View File

@ -892,7 +892,7 @@ unsigned TargetLowering::getVectorTypeBreakdown(LLVMContext &Context, EVT VT,
// If there is a wider vector type with the same element type as this one,
// we should widen to that legal vector type. This handles things like
// <2 x float> -> <4 x float>.
if (NumElts != 1 && getTypeAction(VT) == Promote) {
if (NumElts != 1 && getTypeAction(Context, VT) == Promote) {
RegisterVT = getTypeToTransformTo(Context, VT);
if (isTypeLegal(RegisterVT)) {
IntermediateVT = RegisterVT;

4
lib/Transforms/Scalar/CodeGenPrepare.cpp
View File

@ -371,9 +371,9 @@ static bool OptimizeNoopCopyExpression(CastInst *CI, const TargetLowering &TLI){
// If these values will be promoted, find out what they will be promoted
// to. This helps us consider truncates on PPC as noop copies when they
// are.
if (TLI.getTypeAction(SrcVT) == TargetLowering::Promote)
if (TLI.getTypeAction(CI->getContext(), SrcVT) == TargetLowering::Promote)
SrcVT = TLI.getTypeToTransformTo(CI->getContext(), SrcVT);
if (TLI.getTypeAction(DstVT) == TargetLowering::Promote)
if (TLI.getTypeAction(CI->getContext(), DstVT) == TargetLowering::Promote)
DstVT = TLI.getTypeToTransformTo(CI->getContext(), DstVT);
// If, after promotion, these are the same types, this is a noop copy.