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//===-- ComplexToLibm.cpp - conversion from Complex to libm calls ---------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "mlir/Conversion/ComplexToLibm/ComplexToLibm.h"
#include "mlir/Dialect/Complex/IR/Complex.h"
#include "mlir/Dialect/Func/IR/FuncOps.h"
#include "mlir/IR/PatternMatch.h"
#include "mlir/Pass/Pass.h"
#include <optional>
namespace mlir {
#define GEN_PASS_DEF_CONVERTCOMPLEXTOLIBM
#include "mlir/Conversion/Passes.h.inc"
} // namespace mlir
using namespace mlir;
namespace {
// Functor to resolve the function name corresponding to the given complex
// result type.
struct ComplexTypeResolver {
std::optional<bool> operator()(Type type) const {
auto complexType = cast<ComplexType>(type);
auto elementType = complexType.getElementType();
if (!isa<Float32Type, Float64Type>(elementType))
return {};
return elementType.getIntOrFloatBitWidth() == 64;
}
};
// Functor to resolve the function name corresponding to the given float result
// type.
struct FloatTypeResolver {
std::optional<bool> operator()(Type type) const {
auto elementType = cast<FloatType>(type);
if (!isa<Float32Type, Float64Type>(elementType))
return {};
return elementType.getIntOrFloatBitWidth() == 64;
}
};
// Pattern to convert scalar complex operations to calls to libm functions.
// Additionally the libm function signatures are declared.
// TypeResolver is a functor returning the libm function name according to the
// expected type double or float.
template <typename Op, typename TypeResolver = ComplexTypeResolver>
struct ScalarOpToLibmCall : public OpRewritePattern<Op> {
public:
using OpRewritePattern<Op>::OpRewritePattern;
ScalarOpToLibmCall<Op, TypeResolver>(MLIRContext *context,
StringRef floatFunc,
StringRef doubleFunc,
PatternBenefit benefit)
: OpRewritePattern<Op>(context, benefit), floatFunc(floatFunc),
doubleFunc(doubleFunc){};
LogicalResult matchAndRewrite(Op op, PatternRewriter &rewriter) const final;
private:
std::string floatFunc, doubleFunc;
};
} // namespace
template <typename Op, typename TypeResolver>
LogicalResult ScalarOpToLibmCall<Op, TypeResolver>::matchAndRewrite(
Op op, PatternRewriter &rewriter) const {
auto module = SymbolTable::getNearestSymbolTable(op);
auto isDouble = TypeResolver()(op.getType());
if (!isDouble.has_value())
return failure();
auto name = *isDouble ? doubleFunc : floatFunc;
auto opFunc = dyn_cast_or_null<SymbolOpInterface>(
SymbolTable::lookupSymbolIn(module, name));
// Forward declare function if it hasn't already been
if (!opFunc) {
OpBuilder::InsertionGuard guard(rewriter);
rewriter.setInsertionPointToStart(&module->getRegion(0).front());
auto opFunctionTy = FunctionType::get(
rewriter.getContext(), op->getOperandTypes(), op->getResultTypes());
opFunc = rewriter.create<func::FuncOp>(rewriter.getUnknownLoc(), name,
opFunctionTy);
opFunc.setPrivate();
}
assert(isa<FunctionOpInterface>(SymbolTable::lookupSymbolIn(module, name)));
rewriter.replaceOpWithNewOp<func::CallOp>(op, name, op.getType(),
op->getOperands());
return success();
}
void mlir::populateComplexToLibmConversionPatterns(RewritePatternSet &patterns,
PatternBenefit benefit) {
patterns.add<ScalarOpToLibmCall<complex::PowOp>>(patterns.getContext(),
"cpowf", "cpow", benefit);
patterns.add<ScalarOpToLibmCall<complex::SqrtOp>>(patterns.getContext(),
"csqrtf", "csqrt", benefit);
patterns.add<ScalarOpToLibmCall<complex::TanhOp>>(patterns.getContext(),
"ctanhf", "ctanh", benefit);
patterns.add<ScalarOpToLibmCall<complex::CosOp>>(patterns.getContext(),
"ccosf", "ccos", benefit);
patterns.add<ScalarOpToLibmCall<complex::SinOp>>(patterns.getContext(),
"csinf", "csin", benefit);
patterns.add<ScalarOpToLibmCall<complex::ConjOp>>(patterns.getContext(),
"conjf", "conj", benefit);
patterns.add<ScalarOpToLibmCall<complex::LogOp>>(patterns.getContext(),
"clogf", "clog", benefit);
patterns.add<ScalarOpToLibmCall<complex::AbsOp, FloatTypeResolver>>(
patterns.getContext(), "cabsf", "cabs", benefit);
patterns.add<ScalarOpToLibmCall<complex::AngleOp, FloatTypeResolver>>(
patterns.getContext(), "cargf", "carg", benefit);
}
namespace {
struct ConvertComplexToLibmPass
: public impl::ConvertComplexToLibmBase<ConvertComplexToLibmPass> {
void runOnOperation() override;
};
} // namespace
void ConvertComplexToLibmPass::runOnOperation() {
auto module = getOperation();
RewritePatternSet patterns(&getContext());
populateComplexToLibmConversionPatterns(patterns, /*benefit=*/1);
ConversionTarget target(getContext());
target.addLegalDialect<func::FuncDialect>();
target.addIllegalOp<complex::PowOp, complex::SqrtOp, complex::TanhOp,
complex::CosOp, complex::SinOp, complex::ConjOp,
complex::LogOp, complex::AbsOp, complex::AngleOp>();
if (failed(applyPartialConversion(module, target, std::move(patterns))))
signalPassFailure();
}
std::unique_ptr<OperationPass<ModuleOp>>
mlir::createConvertComplexToLibmPass() {
return std::make_unique<ConvertComplexToLibmPass>();
}
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