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Enable target_feature on any LLVM 6+ #49428

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Mar 29, 2018
Merged

Enable target_feature on any LLVM 6+ #49428

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12 changes: 4 additions & 8 deletions src/rustllvm/PassWrapper.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -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 {
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6 changes: 5 additions & 1 deletion src/test/run-pass/sse2.rs
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Expand Up @@ -8,7 +8,8 @@
// option. This file may not be copied, modified, or distributed
// except according to those terms.

// no-system-llvm -- needs MCSubtargetInfo::getFeatureTable()
// min-llvm-version 6.0
// ^ needs MCSubtargetInfo::checkFeatures()
// ignore-cloudabi no std::env

#![feature(cfg_target_feature)]
Expand All @@ -29,4 +30,7 @@ fn main() {
assert!(cfg!(target_feature = "sse2"),
"SSE2 was not detected as available on an x86 platform");
}
// check a negative case too -- whitelisted on x86, but not enabled by default
assert!(cfg!(not(target_feature = "avx2")),
"AVX2 shouldn't be detected as available by default on any platform");
}