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d41c35dc2f
The first try (r238051) to land this was reverted due to ExecutionEngine build failure; that was hopefully addressed by r238788. The second try (r238842) to land this was reverted due to BUILD_SHARED_LIBS failure; that was hopefully addressed by r238953. This patch adds a TargetRecip class for processing many recip codegen possibilities. The class is intended to handle both command-line options to llc as well as options passed in from a front-end such as clang with the -mrecip option. The x86 backend is updated to use the new functionality. Only -mcpu=btver2 with -ffast-math should see a functional change from this patch. All other x86 CPUs continue to *not* use reciprocal estimates by default with -ffast-math. Differential Revision: http://reviews.llvm.org/D8982 llvm-svn: 239001
74 lines
2.3 KiB
C++
74 lines
2.3 KiB
C++
//===--------------------- llvm/Target/TargetRecip.h ------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This class is used to customize machine-specific reciprocal estimate code
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// generation in a target-independent way.
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// If a target does not support operations in this specification, then code
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// generation will default to using supported operations.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TARGET_TARGETRECIP_H
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#define LLVM_TARGET_TARGETRECIP_H
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#include "llvm/ADT/StringRef.h"
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#include <vector>
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#include <string>
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#include <map>
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namespace llvm {
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struct TargetRecip {
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public:
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TargetRecip();
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/// Initialize all or part of the operations from command-line options or
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/// a front end.
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TargetRecip(const std::vector<std::string> &Args);
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/// Set whether a particular reciprocal operation is enabled and how many
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/// refinement steps are needed when using it. Use "all" to set enablement
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/// and refinement steps for all operations.
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void setDefaults(const StringRef &Key, bool Enable, unsigned RefSteps);
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/// Return true if the reciprocal operation has been enabled by default or
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/// from the command-line. Return false if the operation has been disabled
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/// by default or from the command-line.
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bool isEnabled(const StringRef &Key) const;
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/// Return the number of iterations necessary to refine the
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/// the result of a machine instruction for the given reciprocal operation.
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unsigned getRefinementSteps(const StringRef &Key) const;
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bool operator==(const TargetRecip &Other) const;
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private:
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enum {
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Uninitialized = -1
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};
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struct RecipParams {
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int8_t Enabled;
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int8_t RefinementSteps;
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RecipParams() : Enabled(Uninitialized), RefinementSteps(Uninitialized) {}
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};
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std::map<StringRef, RecipParams> RecipMap;
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typedef std::map<StringRef, RecipParams>::iterator RecipIter;
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typedef std::map<StringRef, RecipParams>::const_iterator ConstRecipIter;
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bool parseGlobalParams(const std::string &Arg);
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void parseIndividualParams(const std::vector<std::string> &Args);
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};
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} // End llvm namespace
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#endif
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