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//=====-- PPCSubtarget.h - Define Subtarget for the PPC -------*- 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 PowerPC specific subclass of TargetSubtarget.
//
//===----------------------------------------------------------------------===//
#ifndef POWERPCSUBTARGET_H
#define POWERPCSUBTARGET_H
#include "llvm/Target/TargetInstrItineraries.h"
#include "llvm/Target/TargetSubtarget.h"
#include <string>
// GCC #defines PPC on Linux but we use it as our namespace name
#undef PPC
namespace llvm {
namespace PPC {
// -m directive values.
enum {
DIR_NONE,
DIR_32,
DIR_601,
DIR_602,
DIR_603,
DIR_7400,
DIR_750,
DIR_970,
DIR_64
};
}
class GlobalValue;
class TargetMachine;
class PPCSubtarget : public TargetSubtarget {
protected:
/// 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;
/// Selected instruction itineraries (one entry per itinerary class.)
InstrItineraryData InstrItins;
/// Which cpu directive was used.
unsigned DarwinDirective;
/// Used by the ISel to turn in optimizations for POWER4-derived architectures
bool IsGigaProcessor;
bool Has64BitSupport;
bool Use64BitRegs;
bool IsPPC64;
bool HasAltivec;
bool HasFSQRT;
bool HasSTFIWX;
bool HasLazyResolverStubs;
bool IsJITCodeModel;
/// DarwinVers - Nonzero if this is a darwin platform. Otherwise, the numeric
/// version of the platform, e.g. 8 = 10.4 (Tiger), 9 = 10.5 (Leopard), etc.
unsigned char DarwinVers; // Is any darwin-ppc platform.
public:
/// This constructor initializes the data members to match that
/// of the specified triple.
///
PPCSubtarget(const std::string &TT, const std::string &FS, bool is64Bit);
/// 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);
/// SetJITMode - This is called to inform the subtarget info that we are
/// producing code for the JIT.
void SetJITMode();
/// 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; }
/// getDarwinDirective - Returns the -m directive specified for the cpu.
///
unsigned getDarwinDirective() const { return DarwinDirective; }
/// getInstrItins - Return the instruction itineraies based on subtarget
/// selection.
const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
/// getTargetDataString - Return the pointer size and type alignment
/// properties of this subtarget.
const char *getTargetDataString() const {
// Note, the alignment values for f64 and i64 on ppc64 in Darwin
// documentation are wrong; these are correct (i.e. "what gcc does").
return isPPC64() ? "E-p:64:64-f64:64:64-i64:64:64-f128:64:128-n32:64"
: "E-p:32:32-f64:32:64-i64:32:64-f128:64:128-n32";
}
/// isPPC64 - Return true if we are generating code for 64-bit pointer mode.
///
bool isPPC64() const { return IsPPC64; }
/// has64BitSupport - Return true if the selected CPU supports 64-bit
/// instructions, regardless of whether we are in 32-bit or 64-bit mode.
bool has64BitSupport() const { return Has64BitSupport; }
/// use64BitRegs - Return true if in 64-bit mode or if we should use 64-bit
/// registers in 32-bit mode when possible. This can only true if
/// has64BitSupport() returns true.
bool use64BitRegs() const { return Use64BitRegs; }
/// hasLazyResolverStub - Return true if accesses to the specified global have
/// to go through a dyld lazy resolution stub. This means that an extra load
/// is required to get the address of the global.
bool hasLazyResolverStub(const GlobalValue *GV,
const TargetMachine &TM) const;
// isJITCodeModel - True if we're generating code for the JIT
bool isJITCodeModel() const { return IsJITCodeModel; }
// Specific obvious features.
bool hasFSQRT() const { return HasFSQRT; }
bool hasSTFIWX() const { return HasSTFIWX; }
bool hasAltivec() const { return HasAltivec; }
bool isGigaProcessor() const { return IsGigaProcessor; }
/// isDarwin - True if this is any darwin platform.
bool isDarwin() const { return DarwinVers != 0; }
/// isDarwin - True if this is darwin9 (leopard, 10.5) or above.
bool isDarwin9() const { return DarwinVers >= 9; }
/// getDarwinVers - Return the darwin version number, 8 = tiger, 9 = leopard.
unsigned getDarwinVers() const { return DarwinVers; }
bool isDarwinABI() const { return isDarwin(); }
bool isSVR4ABI() const { return !isDarwin(); }
};
} // End llvm namespace
#endif
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