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#pragma once
#include <torch/csrc/jit/tensorexpr/codegen.h>
#include <torch/csrc/jit/tensorexpr/ir_printer.h>
namespace torch::jit::tensorexpr {
class CppVarNameRewriter;
// Generates C++ code from the IR.
//
// Vector operations are unrolled.
// For example:
// C[Ramp(0, 1, 3)] = A[Ramp(0, 2, 3)] + B[Ramp(0, 3, 3)];
// is unrolled into:
// C[0] = A[0] + B[0];
// C[1] = A[2] + B[3];
// C[2] = A[4] + B[6];
class TORCH_API CppPrinter : public IRPrinter {
public:
explicit CppPrinter(std::ostream* os);
~CppPrinter() override;
void printPrologue();
using IRPrinter::visit;
// Binary expressions.
void visit(const ModPtr&) override;
void visit(const MaxPtr&) override;
void visit(const MinPtr&) override;
// Conditional expressions.
void visit(const CompareSelectPtr&) override;
void visit(const IfThenElsePtr&) override;
// Tensor operations.
void visit(const AllocatePtr&) override;
void visit(const FreePtr&) override;
void visit(const LoadPtr&) override;
void visit(const StorePtr&) override;
// Casts.
void visit(const CastPtr&) override;
void visit(const BitCastPtr&) override;
// Calls.
void visit(const IntrinsicsPtr&) override;
void visit(const ExternalCallPtr&) override;
// Vars.
void visit(const LetPtr&) override;
void visit(const VarPtr&) override;
// Vector data types.
void visit(const RampPtr&) override;
void visit(const BroadcastPtr&) override;
private:
int lane_;
std::unordered_map<VarPtr, ExprPtr> vector_vars_;
};
class TORCH_API CppCodeGen : public CodeGen {
public:
CppCodeGen(
StmtPtr stmt,
const std::vector<BufferArg>& buffer_args,
at::Device device = at::kCPU,
const std::string& kernel_func_name = "func");
~CppCodeGen() override;
void call(const std::vector<CallArg>& args) override;
void call_raw(const std::vector<void*>& args) override;
template <typename... Ts>
void operator()(const Ts&... ts) {
call(std::vector<CallArg>({CallArg(ts)...}));
}
std::string getCodeText(const std::string& attr = "") override {
return oss_.str();
}
private:
void init();
std::ostream& os() {
return printer_->os();
}
std::ostringstream oss_;
std::unique_ptr<CppPrinter> printer_;
std::unique_ptr<CppVarNameRewriter> var_name_rewriter_;
};
} // namespace torch::jit::tensorexpr
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