ARMSubtarget.h revision 4ee451de366474b9c228b4e5fa573795a715216d
1//=====---- ARMSubtarget.h - Define Subtarget for the ARM -----*- C++ -*--====// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file declares the ARM specific subclass of TargetSubtarget. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef ARMSUBTARGET_H 15#define ARMSUBTARGET_H 16 17#include "llvm/Target/TargetSubtarget.h" 18#include <string> 19 20namespace llvm { 21class Module; 22 23class ARMSubtarget : public TargetSubtarget { 24protected: 25 enum ARMArchEnum { 26 V4T, V5T, V5TE, V6 27 }; 28 29 /// ARMArchVersion - ARM architecture vecrsion: V4T (base), V5T, V5TE, 30 /// and V6. 31 ARMArchEnum ARMArchVersion; 32 33 /// HasVFP2 - True if the processor supports Vector Floating Point (VFP) V2 34 /// instructions. 35 bool HasVFP2; 36 37 /// IsThumb - True if we are in thumb mode, false if in ARM mode. 38 bool IsThumb; 39 40 /// UseThumbBacktraces - True if we use thumb style backtraces. 41 bool UseThumbBacktraces; 42 43 /// IsR9Reserved - True if R9 is a not available as general purpose register. 44 bool IsR9Reserved; 45 46 /// stackAlignment - The minimum alignment known to hold of the stack frame on 47 /// entry to the function and which must be maintained by every function. 48 unsigned stackAlignment; 49 50 public: 51 enum { 52 isELF, isDarwin 53 } TargetType; 54 55 enum { 56 ARM_ABI_APCS, 57 ARM_ABI_AAPCS // ARM EABI 58 } TargetABI; 59 60 /// This constructor initializes the data members to match that 61 /// of the specified module. 62 /// 63 ARMSubtarget(const Module &M, const std::string &FS, bool thumb); 64 65 unsigned getMaxInlineSizeThreshold() const { 66 // FIXME: For now, we don't lower memcpy's to loads / stores for Thumb. 67 // Change this once Thumb ldmia / stmia support is added. 68 return isThumb() ? 0 : 64; 69 } 70 /// ParseSubtargetFeatures - Parses features string setting specified 71 /// subtarget options. Definition of function is auto generated by tblgen. 72 void ParseSubtargetFeatures(const std::string &FS, const std::string &CPU); 73 74 bool hasV4TOps() const { return ARMArchVersion >= V4T; } 75 bool hasV5TOps() const { return ARMArchVersion >= V5T; } 76 bool hasV5TEOps() const { return ARMArchVersion >= V5TE; } 77 bool hasV6Ops() const { return ARMArchVersion >= V6; } 78 79 bool hasVFP2() const { return HasVFP2; } 80 81 bool isTargetDarwin() const { return TargetType == isDarwin; } 82 bool isTargetELF() const { return TargetType == isELF; } 83 84 bool isAPCS_ABI() const { return TargetABI == ARM_ABI_APCS; } 85 bool isAAPCS_ABI() const { return TargetABI == ARM_ABI_AAPCS; } 86 87 bool isThumb() const { return IsThumb; } 88 89 bool useThumbBacktraces() const { return UseThumbBacktraces; } 90 bool isR9Reserved() const { return IsR9Reserved; } 91 92 /// getStackAlignment - Returns the minimum alignment known to hold of the 93 /// stack frame on entry to the function and which must be maintained by every 94 /// function for this subtarget. 95 unsigned getStackAlignment() const { return stackAlignment; } 96}; 97} // End llvm namespace 98 99#endif // ARMSUBTARGET_H 100