llvm-6502/lib/Target/X86/X86Subtarget.h
2011-04-19 21:14:45 +00:00

259 lines
8.9 KiB
C++

//=====---- X86Subtarget.h - Define Subtarget for the X86 -----*- C++ -*--====//
//
// The LLVM Compiler Infrastructure
//
// This file 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/ADT/Triple.h"
#include "llvm/Target/TargetSubtarget.h"
#include "llvm/CallingConv.h"
#include <string>
namespace llvm {
class GlobalValue;
class TargetMachine;
/// PICStyles - The X86 backend supports a number of different styles of PIC.
///
namespace PICStyles {
enum Style {
StubPIC, // Used on i386-darwin in -fPIC mode.
StubDynamicNoPIC, // Used on i386-darwin in -mdynamic-no-pic mode.
GOT, // Used on many 32-bit unices in -fPIC mode.
RIPRel, // Used on X86-64 when not in -static mode.
None // Set when in -static mode (not PIC or DynamicNoPIC mode).
};
}
class X86Subtarget : public TargetSubtarget {
protected:
enum X86SSEEnum {
NoMMXSSE, MMX, SSE1, SSE2, SSE3, SSSE3, SSE41, SSE42
};
enum X863DNowEnum {
NoThreeDNow, ThreeDNow, ThreeDNowA
};
/// PICStyle - Which PIC style to use
///
PICStyles::Style PICStyle;
/// X86SSELevel - MMX, SSE1, SSE2, SSE3, SSSE3, SSE41, SSE42, or
/// none supported.
X86SSEEnum X86SSELevel;
/// X863DNowLevel - 3DNow or 3DNow Athlon, or none supported.
///
X863DNowEnum X863DNowLevel;
/// HasCMov - True if this processor has conditional move instructions
/// (generally pentium pro+).
bool HasCMov;
/// HasX86_64 - True if the processor supports X86-64 instructions.
///
bool HasX86_64;
/// HasPOPCNT - True if the processor supports POPCNT.
bool HasPOPCNT;
/// HasSSE4A - True if the processor supports SSE4A instructions.
bool HasSSE4A;
/// HasAVX - Target has AVX instructions
bool HasAVX;
/// HasAES - Target has AES instructions
bool HasAES;
/// HasCLMUL - Target has carry-less multiplication
bool HasCLMUL;
/// HasFMA3 - Target has 3-operand fused multiply-add
bool HasFMA3;
/// HasFMA4 - Target has 4-operand fused multiply-add
bool HasFMA4;
/// IsBTMemSlow - True if BT (bit test) of memory instructions are slow.
bool IsBTMemSlow;
/// IsUAMemFast - True if unaligned memory access is fast.
bool IsUAMemFast;
/// HasVectorUAMem - True if SIMD operations can have unaligned memory
/// operands. This may require setting a feature bit in the processor.
bool HasVectorUAMem;
/// 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;
/// Max. memset / memcpy size that is turned into rep/movs, rep/stos ops.
///
unsigned MaxInlineSizeThreshold;
/// TargetTriple - What processor and OS we're targeting.
Triple TargetTriple;
private:
/// Is64Bit - True if the processor supports 64-bit instructions and
/// pointer size is 64 bit.
bool Is64Bit;
public:
/// This constructor initializes the data members to match that
/// of the specified triple.
///
X86Subtarget(const std::string &TT, const std::string &FS, bool is64Bit);
/// 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; }
/// getMaxInlineSizeThreshold - Returns the maximum memset / memcpy size
/// that still makes it profitable to inline the call.
unsigned getMaxInlineSizeThreshold() const { return MaxInlineSizeThreshold; }
/// ParseSubtargetFeatures - Parses features string setting specified
/// subtarget options. Definition of function is auto generated by tblgen.
std::string ParseSubtargetFeatures(const std::string &FS,
const std::string &CPU);
/// AutoDetectSubtargetFeatures - Auto-detect CPU features using CPUID
/// instruction.
void AutoDetectSubtargetFeatures();
bool is64Bit() const { return Is64Bit; }
PICStyles::Style getPICStyle() const { return PICStyle; }
void setPICStyle(PICStyles::Style Style) { PICStyle = Style; }
bool hasCMov() const { return HasCMov; }
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 hasSSSE3() const { return X86SSELevel >= SSSE3; }
bool hasSSE41() const { return X86SSELevel >= SSE41; }
bool hasSSE42() const { return X86SSELevel >= SSE42; }
bool hasSSE4A() const { return HasSSE4A; }
bool has3DNow() const { return X863DNowLevel >= ThreeDNow; }
bool has3DNowA() const { return X863DNowLevel >= ThreeDNowA; }
bool hasPOPCNT() const { return HasPOPCNT; }
bool hasAVX() const { return HasAVX; }
bool hasXMM() const { return hasSSE1() || hasAVX(); }
bool hasXMMInt() const { return hasSSE2() || hasAVX(); }
bool hasAES() const { return HasAES; }
bool hasCLMUL() const { return HasCLMUL; }
bool hasFMA3() const { return HasFMA3; }
bool hasFMA4() const { return HasFMA4; }
bool isBTMemSlow() const { return IsBTMemSlow; }
bool isUnalignedMemAccessFast() const { return IsUAMemFast; }
bool hasVectorUAMem() const { return HasVectorUAMem; }
const Triple &getTargetTriple() const { return TargetTriple; }
bool isTargetDarwin() const { return TargetTriple.isOSDarwin(); }
bool isTargetFreeBSD() const {
return TargetTriple.getOS() == Triple::FreeBSD;
}
bool isTargetSolaris() const {
return TargetTriple.getOS() == Triple::Solaris;
}
// ELF is a reasonably sane default and the only other X86 targets we
// support are Darwin and Windows. Just use "not those".
bool isTargetELF() const {
return !isTargetDarwin() && !isTargetWindows() && !isTargetCygMing();
}
bool isTargetLinux() const { return TargetTriple.getOS() == Triple::Linux; }
bool isTargetWindows() const { return TargetTriple.getOS() == Triple::Win32; }
bool isTargetMingw() const { return TargetTriple.getOS() == Triple::MinGW32; }
bool isTargetCygwin() const { return TargetTriple.getOS() == Triple::Cygwin; }
bool isTargetCygMing() const {
return isTargetMingw() || isTargetCygwin();
}
/// isTargetCOFF - Return true if this is any COFF/Windows target variant.
bool isTargetCOFF() const {
return isTargetMingw() || isTargetCygwin() || isTargetWindows();
}
bool isTargetWin64() const {
return Is64Bit && (isTargetMingw() || isTargetWindows());
}
bool isTargetEnvMacho() const {
return isTargetDarwin() || (TargetTriple.getEnvironment() == Triple::MachO);
}
bool isTargetWin32() const {
return !Is64Bit && (isTargetMingw() || isTargetWindows());
}
bool isPICStyleSet() const { return PICStyle != PICStyles::None; }
bool isPICStyleGOT() const { return PICStyle == PICStyles::GOT; }
bool isPICStyleRIPRel() const { return PICStyle == PICStyles::RIPRel; }
bool isPICStyleStubPIC() const {
return PICStyle == PICStyles::StubPIC;
}
bool isPICStyleStubNoDynamic() const {
return PICStyle == PICStyles::StubDynamicNoPIC;
}
bool isPICStyleStubAny() const {
return PICStyle == PICStyles::StubDynamicNoPIC ||
PICStyle == PICStyles::StubPIC; }
/// ClassifyGlobalReference - Classify a global variable reference for the
/// current subtarget according to how we should reference it in a non-pcrel
/// context.
unsigned char ClassifyGlobalReference(const GlobalValue *GV,
const TargetMachine &TM)const;
/// ClassifyBlockAddressReference - Classify a blockaddress reference for the
/// current subtarget according to how we should reference it in a non-pcrel
/// context.
unsigned char ClassifyBlockAddressReference() const;
/// IsLegalToCallImmediateAddr - Return true if the subtarget allows calls
/// to immediate address.
bool IsLegalToCallImmediateAddr(const TargetMachine &TM) const;
/// This function returns the name of a function which has an interface
/// like the non-standard bzero function, if such a function exists on
/// the current subtarget and it is considered prefereable over
/// memset with zero passed as the second argument. Otherwise it
/// returns null.
const char *getBZeroEntry() const;
/// getSpecialAddressLatency - For targets where it is beneficial to
/// backschedule instructions that compute addresses, return a value
/// indicating the number of scheduling cycles of backscheduling that
/// should be attempted.
unsigned getSpecialAddressLatency() const;
/// IsCalleePop - Test whether a function should pop its own arguments.
bool IsCalleePop(bool isVarArg, CallingConv::ID CallConv) const;
};
} // End llvm namespace
#endif