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Add an "implies" field to features. This indicates that, if the current

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feature is set, then the features in the implied list should be set also.
The opposite is also enforced: if a feature in the implied list isn't set,
then the feature that owns that implies list shouldn't be set either.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36756 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling
2007-05-04 20:38:40 +00:00
parent 2e7899dae9
commit 4222d806fa
5 changed files with 132 additions and 66 deletions
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51
lib/Target/SubtargetFeature.cpp
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@@ -199,6 +199,43 @@ void SubtargetFeatures::setCPUIfNone(const std::string &String) {
if (Features[0].empty()) setCPU(String);
}
/// SetImpliedBits - For each feature that is (transitively) implied by this
/// feature, set it.
///
static
void SetImpliedBits(uint32_t &Bits, const SubtargetFeatureKV *FeatureEntry,
const SubtargetFeatureKV *FeatureTable,
size_t FeatureTableSize) {
for (size_t i = 0; i < FeatureTableSize; ++i) {
const SubtargetFeatureKV &FE = FeatureTable[i];
if (FeatureEntry->Value == FE.Value) continue;
if (FeatureEntry->Implies & FE.Value) {
Bits |= FE.Value;
SetImpliedBits(Bits, &FE, FeatureTable, FeatureTableSize);
}
}
}
/// ClearImpliedBits - For each feature that (transitively) implies this
/// feature, clear it.
///
static
void ClearImpliedBits(uint32_t &Bits, const SubtargetFeatureKV *FeatureEntry,
const SubtargetFeatureKV *FeatureTable,
size_t FeatureTableSize) {
for (size_t i = 0; i < FeatureTableSize; ++i) {
const SubtargetFeatureKV &FE = FeatureTable[i];
if (FeatureEntry->Value == FE.Value) continue;
if (FE.Implies & FeatureEntry->Value) {
Bits &= ~FE.Value;
ClearImpliedBits(Bits, &FE, FeatureTable, FeatureTableSize);
}
}
}
/// getBits - Get feature bits.
///
@@ -251,8 +288,17 @@ uint32_t SubtargetFeatures::getBits(const SubtargetFeatureKV *CPUTable,
// If there is a match
if (FeatureEntry) {
// Enable/disable feature in bits
if (isEnabled(Feature)) Bits |= FeatureEntry->Value;
else Bits &= ~FeatureEntry->Value;
if (isEnabled(Feature)) {
Bits |= FeatureEntry->Value;
// For each feature that this implies, set it.
SetImpliedBits(Bits, FeatureEntry, FeatureTable, FeatureTableSize);
} else {
Bits &= ~FeatureEntry->Value;
// For each feature that implies this, clear it.
ClearImpliedBits(Bits, FeatureEntry, FeatureTable, FeatureTableSize);
}
} else {
cerr << "'" << Feature
<< "' is not a recognized feature for this target"
@@ -260,6 +306,7 @@ uint32_t SubtargetFeatures::getBits(const SubtargetFeatureKV *CPUTable,
<< "\n";
}
}
return Bits;
}