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//===--------------------- llvm/Target/TargetRecip.h ------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This class is used to customize machine-specific reciprocal estimate code
// generation in a target-independent way.
// If a target does not support operations in this specification, then code
// generation will default to using supported operations.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TARGET_TARGETRECIP_H
#define LLVM_TARGET_TARGETRECIP_H
#include "llvm/ADT/StringRef.h"
#include <vector>
#include <string>
#include <map>
namespace llvm {
struct TargetRecip {
public:
TargetRecip();
/// Initialize all or part of the operations from command-line options or
/// a front end.
TargetRecip(const std::vector<std::string> &Args);
/// Set whether a particular reciprocal operation is enabled and how many
/// refinement steps are needed when using it. Use "all" to set enablement
/// and refinement steps for all operations.
void setDefaults(const StringRef &Key, bool Enable, unsigned RefSteps);
/// Return true if the reciprocal operation has been enabled by default or
/// from the command-line. Return false if the operation has been disabled
/// by default or from the command-line.
bool isEnabled(const StringRef &Key) const;
/// Return the number of iterations necessary to refine the
/// the result of a machine instruction for the given reciprocal operation.
unsigned getRefinementSteps(const StringRef &Key) const;
bool operator==(const TargetRecip &Other) const;
private:
enum {
Uninitialized = -1
};
struct RecipParams {
int8_t Enabled;
int8_t RefinementSteps;
RecipParams() : Enabled(Uninitialized), RefinementSteps(Uninitialized) {}
};
std::map<StringRef, RecipParams> RecipMap;
typedef std::map<StringRef, RecipParams>::iterator RecipIter;
typedef std::map<StringRef, RecipParams>::const_iterator ConstRecipIter;
bool parseGlobalParams(const std::string &Arg);
void parseIndividualParams(const std::vector<std::string> &Args);
};
} // End llvm namespace
#endif
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