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rewrite EnforceSmallerThan to be less bone headed.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98933 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-03-19 04:54:36 +00:00
parent e9eda0f85d
commit 5a9b8fb95c
2 changed files with 85 additions and 69 deletions
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149
utils/TableGen/CodeGenDAGPatterns.cpp
View File

@ -65,6 +65,13 @@ EEVT::TypeSet::TypeSet(const std::vector<MVT::SimpleValueType> &VTList) {
TypeVec.erase(std::unique(TypeVec.begin(), TypeVec.end()), TypeVec.end());
}
/// FillWithPossibleTypes - Set to all legal types and return true, only valid
/// on completely unknown type sets.
bool EEVT::TypeSet::FillWithPossibleTypes(TreePattern &TP) {
assert(isCompletelyUnknown());
*this = TP.getDAGPatterns().getTargetInfo().getLegalValueTypes();
return true;
}
/// hasIntegerTypes - Return true if this TypeSet contains iAny or an
/// integer value type.
@ -202,10 +209,8 @@ bool EEVT::TypeSet::EnforceInteger(TreePattern &TP) {
bool MadeChange = false;
// If we know nothing, then get the full set.
if (TypeVec.empty()) {
*this = TP.getDAGPatterns().getTargetInfo().getLegalValueTypes();
MadeChange = true;
}
if (TypeVec.empty())
MadeChange = FillWithPossibleTypes(TP);
if (!hasFloatingPointTypes())
return MadeChange;
@ -227,10 +232,8 @@ bool EEVT::TypeSet::EnforceFloatingPoint(TreePattern &TP) {
bool MadeChange = false;
// If we know nothing, then get the full set.
if (TypeVec.empty()) {
*this = TP.getDAGPatterns().getTargetInfo().getLegalValueTypes();
MadeChange = true;
}
if (TypeVec.empty())
MadeChange = FillWithPossibleTypes(TP);
if (!hasIntegerTypes())
return MadeChange;
@ -252,10 +255,8 @@ bool EEVT::TypeSet::EnforceScalar(TreePattern &TP) {
bool MadeChange = false;
// If we know nothing, then get the full set.
if (TypeVec.empty()) {
*this = TP.getDAGPatterns().getTargetInfo().getLegalValueTypes();
MadeChange = true;
}
if (TypeVec.empty())
MadeChange = FillWithPossibleTypes(TP);
if (!hasVectorTypes())
return MadeChange;
@ -277,10 +278,8 @@ bool EEVT::TypeSet::EnforceVector(TreePattern &TP) {
bool MadeChange = false;
// If we know nothing, then get the full set.
if (TypeVec.empty()) {
*this = TP.getDAGPatterns().getTargetInfo().getLegalValueTypes();
MadeChange = true;
}
if (TypeVec.empty())
MadeChange = FillWithPossibleTypes(TP);
// Filter out all the scalar types.
for (unsigned i = 0; i != TypeVec.size(); ++i)
@ -294,72 +293,86 @@ bool EEVT::TypeSet::EnforceVector(TreePattern &TP) {
}
/// EnforceSmallerThan - 'this' must be a smaller VT than Other. Update
/// this an other based on this information.
bool EEVT::TypeSet::EnforceSmallerThan(EEVT::TypeSet &Other, TreePattern &TP) {
// Both operands must be integer or FP, but we don't care which.
bool MadeChange = false;
if (isCompletelyUnknown())
MadeChange = FillWithPossibleTypes(TP);
if (Other.isCompletelyUnknown())
MadeChange = Other.FillWithPossibleTypes(TP);
// If one side is known to be integer or known to be FP but the other side has
// no information, get at least the type integrality info in there.
if (!hasFloatingPointTypes())
MadeChange |= Other.EnforceInteger(TP);
else if (!hasIntegerTypes())
MadeChange |= Other.EnforceFloatingPoint(TP);
if (!Other.hasFloatingPointTypes())
MadeChange |= EnforceInteger(TP);
else if (!Other.hasIntegerTypes())
MadeChange |= EnforceFloatingPoint(TP);
assert(!isCompletelyUnknown() && !Other.isCompletelyUnknown() &&
"Should have a type list now");
// If one contains vectors but the other doesn't pull vectors out.
if (!hasVectorTypes())
MadeChange |= Other.EnforceScalar(TP);
if (!hasVectorTypes())
MadeChange |= EnforceScalar(TP);
// This code does not currently handle nodes which have multiple types,
// where some types are integer, and some are fp. Assert that this is not
// the case.
assert(!(hasIntegerTypes() && hasFloatingPointTypes()) &&
!(Other.hasIntegerTypes() && Other.hasFloatingPointTypes()) &&
"SDTCisOpSmallerThanOp does not handle mixed int/fp types!");
// If one side is known to be integer or known to be FP but the other side has
// no information, get at least the type integrality info in there.
if (hasIntegerTypes())
MadeChange |= Other.EnforceInteger(TP);
else if (hasFloatingPointTypes())
MadeChange |= Other.EnforceFloatingPoint(TP);
if (Other.hasIntegerTypes())
MadeChange |= EnforceInteger(TP);
else if (Other.hasFloatingPointTypes())
MadeChange |= EnforceFloatingPoint(TP);
assert(!isCompletelyUnknown() && !Other.isCompletelyUnknown() &&
"Should have a type list now");
// Okay, find the smallest type from the current set and remove it from the
// largest set.
MVT::SimpleValueType Smallest = TypeVec[0];
for (unsigned i = 1, e = TypeVec.size(); i != e; ++i)
if (TypeVec[i] < Smallest)
Smallest = TypeVec[i];
// If one contains vectors but the other doesn't pull vectors out.
if (!hasVectorTypes() && Other.hasVectorTypes())
MadeChange |= Other.EnforceScalar(TP);
if (hasVectorTypes() && !Other.hasVectorTypes())
MadeChange |= EnforceScalar(TP);
// If this is the only type in the large set, the constraint can never be
// satisfied.
if (Other.TypeVec.size() == 1 && Other.TypeVec[0] == Smallest)
TP.error("Type inference contradiction found, '" +
Other.getName() + "' has nothing larger than '" + getName() +"'!");
// FIXME: This is a bone-headed way to do this.
SmallVector<MVT::SimpleValueType, 2>::iterator TVI =
std::find(Other.TypeVec.begin(), Other.TypeVec.end(), Smallest);
if (TVI != Other.TypeVec.end()) {
Other.TypeVec.erase(TVI);
MadeChange = true;
}
// Get the set of legal VTs and filter it based on the known integrality.
const CodeGenTarget &CGT = TP.getDAGPatterns().getTargetInfo();
TypeSet LegalVTs = CGT.getLegalValueTypes();
// TODO: If one or the other side is known to be a specific VT, we could prune
// LegalVTs.
if (hasIntegerTypes())
LegalVTs.EnforceInteger(TP);
else if (hasFloatingPointTypes())
LegalVTs.EnforceFloatingPoint(TP);
else
return MadeChange;
// Okay, find the largest type in the Other set and remove it from the
// current set.
MVT::SimpleValueType Largest = Other.TypeVec[0];
for (unsigned i = 1, e = Other.TypeVec.size(); i != e; ++i)
if (Other.TypeVec[i] > Largest)
Largest = Other.TypeVec[i];
switch (LegalVTs.TypeVec.size()) {
case 0: assert(0 && "No legal VTs?");
default: // Too many VT's to pick from.
// TODO: If the biggest type in LegalVTs is in this set, we could remove it.
// If one or the other side is known to be a specific VT, we could prune
// LegalVTs.
return MadeChange;
case 1:
// Only one VT of this flavor. Cannot ever satisfy the constraints.
return MergeInTypeInfo(MVT::Other, TP); // throw
case 2:
// If we have exactly two possible types, the little operand must be the
// small one, the big operand should be the big one. This is common with
// float/double for example.
assert(LegalVTs.TypeVec[0] < LegalVTs.TypeVec[1] && "Should be sorted!");
MadeChange |= MergeInTypeInfo(LegalVTs.TypeVec[0], TP);
MadeChange |= Other.MergeInTypeInfo(LegalVTs.TypeVec[1], TP);
return MadeChange;
}
// If this is the only type in the small set, the constraint can never be
// satisfied.
if (TypeVec.size() == 1 && TypeVec[0] == Largest)
TP.error("Type inference contradiction found, '" +
getName() + "' has nothing smaller than '" + Other.getName()+"'!");
TVI = std::find(TypeVec.begin(), TypeVec.end(), Largest);
if (TVI != TypeVec.end()) {
TypeVec.erase(TVI);
MadeChange = true;
}
return MadeChange;
}
/// EnforceVectorEltTypeIs - 'this' is now constrainted to be a vector type
@ -370,10 +383,8 @@ bool EEVT::TypeSet::EnforceVectorEltTypeIs(MVT::SimpleValueType VT,
bool MadeChange = false;
// If we know nothing, then get the full set.
if (TypeVec.empty()) {
*this = TP.getDAGPatterns().getTargetInfo().getLegalValueTypes();
MadeChange = true;
}
if (TypeVec.empty())
MadeChange = FillWithPossibleTypes(TP);
// Filter out all the non-vector types and types which don't have the right
// element type.

5
utils/TableGen/CodeGenDAGPatterns.h
View File

@ -133,6 +133,11 @@ namespace EEVT {
bool operator!=(const TypeSet &RHS) const { return TypeVec != RHS.TypeVec; }
bool operator==(const TypeSet &RHS) const { return TypeVec == RHS.TypeVec; }
private:
/// FillWithPossibleTypes - Set to all legal types and return true, only
/// valid on completely unknown type sets
bool FillWithPossibleTypes(TreePattern &TP);
};
}