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//=====---- X86Subtarget.h - Define Subtarget for the X86 -----*- C++ -*--====//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Nate Begeman and is distributed under the
// University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares the X86 specific subclass of TargetSubtarget.
//
//===----------------------------------------------------------------------===//
#ifndef X86SUBTARGET_H
#define X86SUBTARGET_H
#include "llvm/Target/TargetSubtarget.h"
#include <string>
namespace llvm {
class Module;
class X86Subtarget : public TargetSubtarget {
protected:
enum X86SSEEnum {
NoMMXSSE, MMX, SSE1, SSE2, SSE3
};
enum X863DNowEnum {
NoThreeDNow, ThreeDNow, ThreeDNowA
};
/// X86SSELevel - MMX, SSE1, SSE2, SSE3, or none supported.
X86SSEEnum X86SSELevel;
/// X863DNowLevel - 3DNow or 3DNow Athlon, or none supported.
X863DNowEnum X863DNowLevel;
/// Is64Bit - True if the processor supports Em64T.
bool Is64Bit;
/// stackAlignment - The minimum alignment known to hold of the stack frame on
/// entry to the function and which must be maintained by every function.
unsigned stackAlignment;
/// Min. memset / memcpy size that is turned into rep/movs, rep/stos ops.
unsigned MinRepStrSizeThreshold;
public:
enum {
isELF, isCygwin, isDarwin, isWindows
} TargetType;
/// This constructor initializes the data members to match that
/// of the specified module.
///
X86Subtarget(const Module &M, const std::string &FS);
/// getStackAlignment - Returns the minimum alignment known to hold of the
/// stack frame on entry to the function and which must be maintained by every
/// function for this subtarget.
unsigned getStackAlignment() const { return stackAlignment; }
/// getMinRepStrSizeThreshold - Returns the minimum memset / memcpy size
/// required to turn the operation into a X86 rep/movs or rep/stos
/// instruction. This is only used if the src / dst alignment is not DWORD
/// aligned.
unsigned getMinRepStrSizeThreshold() const { return MinRepStrSizeThreshold; }
/// ParseSubtargetFeatures - Parses features string setting specified
/// subtarget options. Definition of function is auto generated by tblgen.
void ParseSubtargetFeatures(const std::string &FS, const std::string &CPU);
bool is64Bit() const { return Is64Bit; }
bool hasMMX() const { return X86SSELevel >= MMX; }
bool hasSSE1() const { return X86SSELevel >= SSE1; }
bool hasSSE2() const { return X86SSELevel >= SSE2; }
bool hasSSE3() const { return X86SSELevel >= SSE3; }
bool has3DNow() const { return X863DNowLevel >= ThreeDNow; }
bool has3DNowA() const { return X863DNowLevel >= ThreeDNowA; }
bool isTargetDarwin() const { return TargetType == isDarwin; }
};
} // End llvm namespace
#endif
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