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[CIR] Add inline interface to CIR dialect #1164

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[CIR] Add inline interface to CIR dialect #1164

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37 changes: 36 additions & 1 deletion clang/lib/CIR/Dialect/IR/CIRDialect.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,7 @@
#include "mlir/Interfaces/InferTypeOpInterface.h"
#include "mlir/Support/LLVM.h"
#include "mlir/Support/LogicalResult.h"
#include "mlir/Transforms/InliningUtils.h"

using namespace mlir;

Expand Down Expand Up @@ -114,6 +115,40 @@ struct CIROpAsmDialectInterface : public OpAsmDialectInterface {
return AliasResult::NoAlias;
}
};

// Minimal interface to inline region with only one block for now (not handling
// the terminator remapping), assuming everything is inlinable.
struct CIRInlinerInterface : DialectInlinerInterface {
using DialectInlinerInterface::DialectInlinerInterface;
// Always allows inlining.
bool isLegalToInline(Operation *call, Operation *callable,
bool wouldBeCloned) const final override {
return true;
}

// Always allows inlining.
bool isLegalToInline(Region *dest, Region *src, bool wouldBeCloned,
IRMapping &valueMapping) const final override {
return true;
}

// Always allows inlining.
bool isLegalToInline(Operation *op, Region *, bool wouldBeCloned,
IRMapping &) const final override {
return true;
}

// Handle the terminator in the case of a single block
void handleTerminator(Operation *op,
ValueRange valuesToReplace) const final override {
// Only handle cir.return for now
if (auto returnOp = dyn_cast<cir::ReturnOp>(op))
for (auto &&[value, operand] :
llvm::zip(valuesToReplace, returnOp.getOperands()))
value.replaceAllUsesWith(operand);
}
};

} // namespace

/// Dialect initialization, the instance will be owned by the context. This is
Expand All @@ -125,7 +160,7 @@ void cir::CIRDialect::initialize() {
#define GET_OP_LIST
#include "clang/CIR/Dialect/IR/CIROps.cpp.inc"
>();
addInterfaces<CIROpAsmDialectInterface>();
addInterfaces<CIRInlinerInterface, CIROpAsmDialectInterface>();
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Incremental patches are way to go, I'm just a bit confused here: is this supposed to change any behavior at this point or is this just a skeleton that has no observed behavior? If this is changing behavior I'd expect a testcase and/or implementations for isLegalToInline to be returning false (for now).

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It does not change the behavior of CIR in this project since it is not used but allows other CIR users to use the inliner.
I was worried someone would ask for a test. 😉 An easy one would have been to just use the inliner pass (instead of the function) in opt except that a lot of other stuff is not yet implemented in CIR.

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I was thinking two types of tests:

  • A test similar to clang/test/CIR/Transforms/mem2reg.cir.
  • Better yet if we add a flag to cc1 as well, like we do for mem2reg in clang/test/CIR/Transforms/mem2reg.c
  • Thoughts for the future: looks like we need a flag that enable all MLIR passes altogether, something like a -fclangir-mlir-opt of sorts, have you thought about that already?

}

Operation *cir::CIRDialect::materializeConstant(mlir::OpBuilder &builder,
Expand Down