4b84223aad
Modifies `#llvm.target<..., features = $FEATURES>` so that `$FEATURES`
is now an `#llvm.target_features<[...]>` attribute (rather than a
`StringAttr`). This enables the attribute to respond to DLTI queries for
the different target features.
The pass updates the `$FEATURES` attribute of the target attr at name
`llvm.target` in accordance with the (Sub)Target's features that the
relevant LLVM backend knows about.
---
DEMO:
```mlir
module attributes {llvm.target = #llvm.target<triple = "x86_64-unknown-linux",
chip = "skylake"> } {
}
```
by way of `-llvm-target-to-target-features` turns into:
```mlir
module attributes {llvm.target = #llvm.target<triple = "x86_64-unknown-linux",
chip = "skylake",
features = <["+64bit", "+64bit-mode", "+adx", "+aes", "+allow-light-256-bit", "+avx", "+avx2", "+bmi", "+bmi2", "+clflushopt", "+cmov", "+crc32", "+cx16", "+cx8", "+ermsb", "+f16c", "+false-deps-popcnt", "+fast-15bytenop", "+fast-gather", "+fast-scalar-fsqrt", "+fast-shld-rotate", "+fast-variable-crosslane-shuffle", "+fast-variable-perlane-shuffle", "+fast-vector-fsqrt", "+fma", "+fsgsbase", "+fxsr", "+idivq-to-divl", "+invpcid", "+lzcnt", "+macrofusion", "+mmx", "+movbe", "+no-bypass-delay-blend", "+no-bypass-delay-mov", "+no-bypass-delay-shuffle", "+nopl", "+pclmul", "+popcnt", "+prfchw", "+rdrnd", "+rdseed", "+sahf", "+slow-3ops-lea", "+sse", "+sse2", "+sse3", "+sse4.1", "+sse4.2", "+ssse3", "+vzeroupper", "+x87", "+xsave", "+xsavec", "+xsaveopt", "+xsaves"]>>} {
}
```
79 lines
2.7 KiB
C++
79 lines
2.7 KiB
C++
//===- TargetToTargetFeatures.cpp - extract features from TargetMachine ---===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "mlir/Target/LLVMIR/Transforms/Passes.h"
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#include "mlir/Target/LLVMIR/Transforms/TargetUtils.h"
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#include "mlir/Dialect/DLTI/DLTI.h"
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#include "mlir/Dialect/LLVMIR/LLVMDialect.h"
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#include "mlir/Target/LLVMIR/Import.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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namespace mlir {
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namespace LLVM {
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#define GEN_PASS_DEF_LLVMTARGETTOTARGETFEATURES
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#include "mlir/Target/LLVMIR/Transforms/Passes.h.inc"
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} // namespace LLVM
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} // namespace mlir
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using namespace mlir;
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struct TargetToTargetFeaturesPass
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: public LLVM::impl::LLVMTargetToTargetFeaturesBase<
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TargetToTargetFeaturesPass> {
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using LLVM::impl::LLVMTargetToTargetFeaturesBase<
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TargetToTargetFeaturesPass>::LLVMTargetToTargetFeaturesBase;
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void runOnOperation() override {
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Operation *op = getOperation();
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if (initializeLLVMTargets)
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LLVM::detail::initializeBackendsOnce();
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auto targetAttr = op->getAttrOfType<LLVM::TargetAttr>(
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LLVM::LLVMDialect::getTargetAttrName());
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if (!targetAttr) {
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op->emitError() << "no LLVM::TargetAttr attribute at key \""
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<< LLVM::LLVMDialect::getTargetAttrName() << "\"";
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return signalPassFailure();
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}
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FailureOr<std::unique_ptr<llvm::TargetMachine>> targetMachine =
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LLVM::detail::getTargetMachine(targetAttr);
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if (failed(targetMachine)) {
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op->emitError() << "failed to obtain llvm::TargetMachine for "
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<< targetAttr;
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return signalPassFailure();
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}
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llvm::MCSubtargetInfo const *subTargetInfo =
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(*targetMachine)->getMCSubtargetInfo();
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const std::vector<llvm::SubtargetFeatureKV> enabledFeatures =
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subTargetInfo->getEnabledProcessorFeatures();
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auto plussedFeatures = llvm::to_vector(
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llvm::map_range(enabledFeatures, [](llvm::SubtargetFeatureKV feature) {
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return std::string("+") + feature.Key;
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}));
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auto plussedFeaturesRefs = llvm::to_vector(llvm::map_range(
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plussedFeatures, [](auto &it) { return StringRef(it.c_str()); }));
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auto fullTargetFeaturesAttr =
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LLVM::TargetFeaturesAttr::get(&getContext(), plussedFeaturesRefs);
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auto updatedTargetAttr =
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LLVM::TargetAttr::get(&getContext(), targetAttr.getTriple(),
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targetAttr.getChip(), fullTargetFeaturesAttr);
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op->setAttr(LLVM::LLVMDialect::getTargetAttrName(), updatedTargetAttr);
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}
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};
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