bjoernager/rust
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Enable target_feature on any LLVM 6+

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In `LLVMRustHasFeature()`, rather than using `MCInfo->getFeatureTable()`
that is specific to Rust's LLVM fork, we can use this in LLVM 6:

    /// Check whether the subtarget features are enabled/disabled as per
    /// the provided string, ignoring all other features.
    bool checkFeatures(StringRef FS) const;

Now rustc using external LLVM can also have `target_feature`.
This commit is contained in:
Josh Stone 2018-03-27 12:27:45 -07:00
parent 9c9424de51
commit a93a4d259a
2 changed files with 9 additions and 9 deletions
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12
src/rustllvm/PassWrapper.cpp
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@ -205,17 +205,13 @@ GEN_SUBTARGETS
extern "C" bool LLVMRustHasFeature(LLVMTargetMachineRef TM,
const char *Feature) {
#if LLVM_RUSTLLVM
#if LLVM_VERSION_GE(6, 0)
TargetMachine *Target = unwrap(TM);
const MCSubtargetInfo *MCInfo = Target->getMCSubtargetInfo();
const FeatureBitset &Bits = MCInfo->getFeatureBits();
const ArrayRef<SubtargetFeatureKV> FeatTable = MCInfo->getFeatureTable();
for (auto &FeatureEntry : FeatTable)
if (!strcmp(FeatureEntry.Key, Feature))
return (Bits & FeatureEntry.Value) == FeatureEntry.Value;
#endif
return MCInfo->checkFeatures(std::string("+") + Feature);
#else
return false;
#endif
}
enum class LLVMRustCodeModel {