ARMSubtarget.h revision 4ee451de366474b9c228b4e5fa573795a715216d
1a8e2989ece6dc46df59b0768184028257f913843Evan Cheng//=====---- ARMSubtarget.h - Define Subtarget for the ARM -----*- C++ -*--====//
2a8e2989ece6dc46df59b0768184028257f913843Evan Cheng//
3a8e2989ece6dc46df59b0768184028257f913843Evan Cheng//                     The LLVM Compiler Infrastructure
4a8e2989ece6dc46df59b0768184028257f913843Evan Cheng//
54ee451de366474b9c228b4e5fa573795a715216dChris Lattner// This file is distributed under the University of Illinois Open Source
64ee451de366474b9c228b4e5fa573795a715216dChris Lattner// License. See LICENSE.TXT for details.
7a8e2989ece6dc46df59b0768184028257f913843Evan Cheng//
8a8e2989ece6dc46df59b0768184028257f913843Evan Cheng//===----------------------------------------------------------------------===//
9a8e2989ece6dc46df59b0768184028257f913843Evan Cheng//
10a8e2989ece6dc46df59b0768184028257f913843Evan Cheng// This file declares the ARM specific subclass of TargetSubtarget.
11a8e2989ece6dc46df59b0768184028257f913843Evan Cheng//
12a8e2989ece6dc46df59b0768184028257f913843Evan Cheng//===----------------------------------------------------------------------===//
13a8e2989ece6dc46df59b0768184028257f913843Evan Cheng
14a8e2989ece6dc46df59b0768184028257f913843Evan Cheng#ifndef ARMSUBTARGET_H
15a8e2989ece6dc46df59b0768184028257f913843Evan Cheng#define ARMSUBTARGET_H
16a8e2989ece6dc46df59b0768184028257f913843Evan Cheng
17a8e2989ece6dc46df59b0768184028257f913843Evan Cheng#include "llvm/Target/TargetSubtarget.h"
18a8e2989ece6dc46df59b0768184028257f913843Evan Cheng#include <string>
19a8e2989ece6dc46df59b0768184028257f913843Evan Cheng
20a8e2989ece6dc46df59b0768184028257f913843Evan Chengnamespace llvm {
21a8e2989ece6dc46df59b0768184028257f913843Evan Chengclass Module;
22a8e2989ece6dc46df59b0768184028257f913843Evan Cheng
23a8e2989ece6dc46df59b0768184028257f913843Evan Chengclass ARMSubtarget : public TargetSubtarget {
24a8e2989ece6dc46df59b0768184028257f913843Evan Chengprotected:
25a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  enum ARMArchEnum {
26a8e2989ece6dc46df59b0768184028257f913843Evan Cheng    V4T, V5T, V5TE, V6
27a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  };
28a8e2989ece6dc46df59b0768184028257f913843Evan Cheng
29a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  /// ARMArchVersion - ARM architecture vecrsion: V4T (base), V5T, V5TE,
30a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  /// and V6.
31a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  ARMArchEnum ARMArchVersion;
32a8e2989ece6dc46df59b0768184028257f913843Evan Cheng
33a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  /// HasVFP2 - True if the processor supports Vector Floating Point (VFP) V2
34a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  /// instructions.
35a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  bool HasVFP2;
36a8e2989ece6dc46df59b0768184028257f913843Evan Cheng
37a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  /// IsThumb - True if we are in thumb mode, false if in ARM mode.
38a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  bool IsThumb;
39a8e2989ece6dc46df59b0768184028257f913843Evan Cheng
40a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  /// UseThumbBacktraces - True if we use thumb style backtraces.
41a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  bool UseThumbBacktraces;
42a8e2989ece6dc46df59b0768184028257f913843Evan Cheng
43a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  /// IsR9Reserved - True if R9 is a not available as general purpose register.
44a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  bool IsR9Reserved;
453630e78db9268dbe81a9369a33e49b857804f2ecLauro Ramos Venancio
46a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  /// stackAlignment - The minimum alignment known to hold of the stack frame on
47a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  /// entry to the function and which must be maintained by every function.
48a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  unsigned stackAlignment;
49a8e2989ece6dc46df59b0768184028257f913843Evan Cheng
50a8e2989ece6dc46df59b0768184028257f913843Evan Cheng public:
511a3771e30e48b9cc21ccdc79fc9cf37ec4104b17Evan Cheng  enum {
521a3771e30e48b9cc21ccdc79fc9cf37ec4104b17Evan Cheng    isELF, isDarwin
531a3771e30e48b9cc21ccdc79fc9cf37ec4104b17Evan Cheng  } TargetType;
541a3771e30e48b9cc21ccdc79fc9cf37ec4104b17Evan Cheng
553630e78db9268dbe81a9369a33e49b857804f2ecLauro Ramos Venancio  enum {
563630e78db9268dbe81a9369a33e49b857804f2ecLauro Ramos Venancio    ARM_ABI_APCS,
573630e78db9268dbe81a9369a33e49b857804f2ecLauro Ramos Venancio    ARM_ABI_AAPCS // ARM EABI
583630e78db9268dbe81a9369a33e49b857804f2ecLauro Ramos Venancio  } TargetABI;
593630e78db9268dbe81a9369a33e49b857804f2ecLauro Ramos Venancio
60a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  /// This constructor initializes the data members to match that
61a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  /// of the specified module.
62a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  ///
6304321f70f5075673934d5b1ed3353dd15d911183Evan Cheng  ARMSubtarget(const Module &M, const std::string &FS, bool thumb);
64a8e2989ece6dc46df59b0768184028257f913843Evan Cheng
65e0703c84ddeb1a1276de4e38210c1127ef5df130Rafael Espindola  unsigned getMaxInlineSizeThreshold() const {
66e0703c84ddeb1a1276de4e38210c1127ef5df130Rafael Espindola    // FIXME: For now, we don't lower memcpy's to loads / stores for Thumb.
67e0703c84ddeb1a1276de4e38210c1127ef5df130Rafael Espindola    // Change this once Thumb ldmia / stmia support is added.
68e0703c84ddeb1a1276de4e38210c1127ef5df130Rafael Espindola    return isThumb() ? 0 : 64;
69e0703c84ddeb1a1276de4e38210c1127ef5df130Rafael Espindola  }
70a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  /// ParseSubtargetFeatures - Parses features string setting specified
71a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  /// subtarget options.  Definition of function is auto generated by tblgen.
72a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  void ParseSubtargetFeatures(const std::string &FS, const std::string &CPU);
73a8e2989ece6dc46df59b0768184028257f913843Evan Cheng
74a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  bool hasV4TOps()  const { return ARMArchVersion >= V4T; }
75a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  bool hasV5TOps()  const { return ARMArchVersion >= V5T; }
76a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  bool hasV5TEOps() const { return ARMArchVersion >= V5TE; }
77a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  bool hasV6Ops()   const { return ARMArchVersion >= V6; }
78a8e2989ece6dc46df59b0768184028257f913843Evan Cheng
79a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  bool hasVFP2() const { return HasVFP2; }
80a8e2989ece6dc46df59b0768184028257f913843Evan Cheng
811a3771e30e48b9cc21ccdc79fc9cf37ec4104b17Evan Cheng  bool isTargetDarwin() const { return TargetType == isDarwin; }
821a3771e30e48b9cc21ccdc79fc9cf37ec4104b17Evan Cheng  bool isTargetELF() const { return TargetType == isELF; }
831a3771e30e48b9cc21ccdc79fc9cf37ec4104b17Evan Cheng
843630e78db9268dbe81a9369a33e49b857804f2ecLauro Ramos Venancio  bool isAPCS_ABI() const { return TargetABI == ARM_ABI_APCS; }
853630e78db9268dbe81a9369a33e49b857804f2ecLauro Ramos Venancio  bool isAAPCS_ABI() const { return TargetABI == ARM_ABI_AAPCS; }
863630e78db9268dbe81a9369a33e49b857804f2ecLauro Ramos Venancio
87a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  bool isThumb() const { return IsThumb; }
88a8e2989ece6dc46df59b0768184028257f913843Evan Cheng
89a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  bool useThumbBacktraces() const { return UseThumbBacktraces; }
90a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  bool isR9Reserved() const { return IsR9Reserved; }
91a8e2989ece6dc46df59b0768184028257f913843Evan Cheng
92a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  /// getStackAlignment - Returns the minimum alignment known to hold of the
93a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  /// stack frame on entry to the function and which must be maintained by every
94a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  /// function for this subtarget.
95a8e2989ece6dc46df59b0768184028257f913843Evan Cheng  unsigned getStackAlignment() const { return stackAlignment; }
96a8e2989ece6dc46df59b0768184028257f913843Evan Cheng};
97a8e2989ece6dc46df59b0768184028257f913843Evan Cheng} // End llvm namespace
98a8e2989ece6dc46df59b0768184028257f913843Evan Cheng
99a8e2989ece6dc46df59b0768184028257f913843Evan Cheng#endif  // ARMSUBTARGET_H
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