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[ARM] Add knowledge of FPU subtarget features to TargetParser

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Add getFPUFeatures to TargetParser, which gets the list of subtarget features
that are enabled/disabled for each FPU, and use it when handling the .fpu
directive.

No functional change in this commit, though clang will start behaving
differently once it starts using this.

Differential Revision: http://reviews.llvm.org/D10237


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239150 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
John Brawn
2015-06-05 13:29:24 +00:00
parent b4435accd5
commit c1c9bc1df7
7 changed files with 185 additions and 104 deletions
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55
lib/MC/SubtargetFeature.cpp
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@@ -190,6 +190,38 @@ SubtargetFeatures::ToggleFeature(FeatureBitset Bits, StringRef Feature,
return Bits;
}
FeatureBitset
SubtargetFeatures::ApplyFeatureFlag(FeatureBitset Bits, StringRef Feature,
ArrayRef<SubtargetFeatureKV> FeatureTable) {
assert(hasFlag(Feature));
// Find feature in table.
const SubtargetFeatureKV *FeatureEntry =
Find(StripFlag(Feature), FeatureTable);
// If there is a match
if (FeatureEntry) {
// Enable/disable feature in bits
if (isEnabled(Feature)) {
Bits |= FeatureEntry->Value;
// For each feature that this implies, set it.
SetImpliedBits(Bits, FeatureEntry, FeatureTable);
} else {
Bits &= ~FeatureEntry->Value;
// For each feature that implies this, clear it.
ClearImpliedBits(Bits, FeatureEntry, FeatureTable);
}
} else {
errs() << "'" << Feature
<< "' is not a recognized feature for this target"
<< " (ignoring feature)\n";
}
return Bits;
}
/// getFeatureBits - Get feature bits a CPU.
///
@@ -245,28 +277,7 @@ SubtargetFeatures::getFeatureBits(StringRef CPU,
if (Feature == "+help")
Help(CPUTable, FeatureTable);
// Find feature in table.
const SubtargetFeatureKV *FeatureEntry =
Find(StripFlag(Feature), FeatureTable);
// If there is a match
if (FeatureEntry) {
// Enable/disable feature in bits
if (isEnabled(Feature)) {
Bits |= FeatureEntry->Value;
// For each feature that this implies, set it.
SetImpliedBits(Bits, FeatureEntry, FeatureTable);
} else {
Bits &= ~FeatureEntry->Value;
// For each feature that implies this, clear it.
ClearImpliedBits(Bits, FeatureEntry, FeatureTable);
}
} else {
errs() << "'" << Feature
<< "' is not a recognized feature for this target"
<< " (ignoring feature)\n";
}
Bits = ApplyFeatureFlag(Bits, Feature, FeatureTable);
}
return Bits;