1 //=====---- ARMSubtarget.h - Define Subtarget for the ARM -----*- C++ -*--====//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file declares the ARM specific subclass of TargetSubtarget.
12 //===----------------------------------------------------------------------===//
14 #ifndef ARMSUBTARGET_H
15 #define ARMSUBTARGET_H
17 #include "llvm/Target/TargetSubtarget.h"
23 class ARMSubtarget : public TargetSubtarget {
26 V4T, V5T, V5TE, V6, V7A
30 None, VFPv2, VFPv3, NEON
33 /// ARMArchVersion - ARM architecture version: V4T (base), V5T, V5TE,
35 ARMArchEnum ARMArchVersion;
37 /// ARMFPUType - Floating Point Unit type.
40 /// IsThumb - True if we are in thumb mode, false if in ARM mode.
43 /// UseThumbBacktraces - True if we use thumb style backtraces.
44 bool UseThumbBacktraces;
46 /// IsR9Reserved - True if R9 is a not available as general purpose register.
49 /// stackAlignment - The minimum alignment known to hold of the stack frame on
50 /// entry to the function and which must be maintained by every function.
51 unsigned stackAlignment;
53 /// CPUString - String name of used CPU.
54 std::string CPUString;
63 ARM_ABI_AAPCS // ARM EABI
66 /// This constructor initializes the data members to match that
67 /// of the specified module.
69 ARMSubtarget(const Module &M, const std::string &FS, bool thumb);
71 /// getMaxInlineSizeThreshold - Returns the maximum memset / memcpy size
72 /// that still makes it profitable to inline the call.
73 unsigned getMaxInlineSizeThreshold() const {
74 // FIXME: For now, we don't lower memcpy's to loads / stores for Thumb.
75 // Change this once Thumb ldmia / stmia support is added.
76 return isThumb() ? 0 : 64;
78 /// ParseSubtargetFeatures - Parses features string setting specified
79 /// subtarget options. Definition of function is auto generated by tblgen.
80 std::string ParseSubtargetFeatures(const std::string &FS,
81 const std::string &CPU);
83 bool hasV4TOps() const { return ARMArchVersion >= V4T; }
84 bool hasV5TOps() const { return ARMArchVersion >= V5T; }
85 bool hasV5TEOps() const { return ARMArchVersion >= V5TE; }
86 bool hasV6Ops() const { return ARMArchVersion >= V6; }
87 bool hasV7Ops() const { return ARMArchVersion >= V7A; }
89 bool hasVFP2() const { return ARMFPUType >= VFPv2; }
90 bool hasVFP3() const { return ARMFPUType >= VFPv3; }
91 bool hasNEON() const { return ARMFPUType >= NEON; }
93 bool isTargetDarwin() const { return TargetType == isDarwin; }
94 bool isTargetELF() const { return TargetType == isELF; }
96 bool isAPCS_ABI() const { return TargetABI == ARM_ABI_APCS; }
97 bool isAAPCS_ABI() const { return TargetABI == ARM_ABI_AAPCS; }
99 bool isThumb() const { return IsThumb; }
101 bool useThumbBacktraces() const { return UseThumbBacktraces; }
102 bool isR9Reserved() const { return IsR9Reserved; }
104 const std::string & getCPUString() const { return CPUString; }
106 /// getStackAlignment - Returns the minimum alignment known to hold of the
107 /// stack frame on entry to the function and which must be maintained by every
108 /// function for this subtarget.
109 unsigned getStackAlignment() const { return stackAlignment; }
111 } // End llvm namespace
113 #endif // ARMSUBTARGET_H