lib/Target/PTX/PTXSubtarget.h

   1 //====-- PTXSubtarget.h - Define Subtarget for the PTX ---------*- 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 PTX specific subclass of TargetSubtargetInfo.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef PTX_SUBTARGET_H
  15 #define PTX_SUBTARGET_H
  16
  17 #include "llvm/Target/TargetSubtargetInfo.h"
  18
  19 #define GET_SUBTARGETINFO_HEADER
  20 #include "PTXGenSubtargetInfo.inc"
  21
  22 namespace llvm {
  23 class StringRef;
  24
  25   class PTXSubtarget : public PTXGenSubtargetInfo {
  26     public:
  27
  28       /**
  29        * Enumeration of Shader Models supported by the back-end.
  30        */
  31       enum PTXTargetEnum {
  32         PTX_COMPUTE_1_0, /*< Compute Compatibility 1.0 */
  33         PTX_COMPUTE_1_1, /*< Compute Compatibility 1.1 */
  34         PTX_COMPUTE_1_2, /*< Compute Compatibility 1.2 */
  35         PTX_COMPUTE_1_3, /*< Compute Compatibility 1.3 */
  36         PTX_COMPUTE_2_0, /*< Compute Compatibility 2.0 */
  37         PTX_LAST_COMPUTE,
  38
  39         PTX_SM_1_0, /*< Shader Model 1.0 */
  40         PTX_SM_1_1, /*< Shader Model 1.1 */
  41         PTX_SM_1_2, /*< Shader Model 1.2 */
  42         PTX_SM_1_3, /*< Shader Model 1.3 */
  43         PTX_SM_2_0, /*< Shader Model 2.0 */
  44         PTX_SM_2_1, /*< Shader Model 2.1 */
  45         PTX_SM_2_2, /*< Shader Model 2.2 */
  46         PTX_SM_2_3, /*< Shader Model 2.3 */
  47         PTX_LAST_SM
  48       };
  49
  50       /**
  51        * Enumeration of PTX versions supported by the back-end.
  52        *
  53        * Currently, PTX 2.0 is the minimum supported version.
  54        */
  55       enum PTXVersionEnum {
  56         PTX_VERSION_2_0,  /*< PTX Version 2.0 */
  57         PTX_VERSION_2_1,  /*< PTX Version 2.1 */
  58         PTX_VERSION_2_2,  /*< PTX Version 2.2 */
  59         PTX_VERSION_2_3   /*< PTX Version 2.3 */
  60       };
  61
  62   private:
  63
  64       /// Shader Model supported on the target GPU.
  65       PTXTargetEnum PTXTarget;
  66
  67       /// PTX Language Version.
  68       PTXVersionEnum PTXVersion;
  69
  70       // The native .f64 type is supported on the hardware.
  71       bool SupportsDouble;
  72
  73       // Support the fused-multiply add (FMA) and multiply-add (MAD)
  74       // instructions
  75       bool SupportsFMA;
  76
  77       // Use .u64 instead of .u32 for addresses.
  78       bool Is64Bit;
  79
  80     public:
  81
  82       PTXSubtarget(const std::string &TT, const std::string &CPU,
  83                    const std::string &FS, bool is64Bit);
  84
  85       // Target architecture accessors
  86       std::string getTargetString() const;
  87
  88       std::string getPTXVersionString() const;
  89
  90       bool supportsDouble() const { return SupportsDouble; }
  91
  92       bool is64Bit() const { return Is64Bit; }
  93
  94       bool supportsFMA() const { return SupportsFMA; }
  95
  96       bool supportsPTX21() const { return PTXVersion >= PTX_VERSION_2_1; }
  97
  98       bool supportsPTX22() const { return PTXVersion >= PTX_VERSION_2_2; }
  99
 100       bool supportsPTX23() const { return PTXVersion >= PTX_VERSION_2_3; }
 101
 102       bool fdivNeedsRoundingMode() const {
 103         return (PTXTarget >= PTX_SM_1_3 && PTXTarget < PTX_LAST_SM) ||
 104                (PTXTarget >= PTX_COMPUTE_1_3 && PTXTarget < PTX_LAST_COMPUTE);
 105       }
 106
 107       bool fmadNeedsRoundingMode() const {
 108         return (PTXTarget >= PTX_SM_1_3 && PTXTarget < PTX_LAST_SM) ||
 109                (PTXTarget >= PTX_COMPUTE_1_3 && PTXTarget < PTX_LAST_COMPUTE);
 110       }
 111
 112       bool useParamSpaceForDeviceArgs() const {
 113         return (PTXTarget >= PTX_SM_2_0 && PTXTarget < PTX_LAST_SM) ||
 114                (PTXTarget >= PTX_COMPUTE_2_0 && PTXTarget < PTX_LAST_COMPUTE);
 115       }
 116
 117     void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
 118   }; // class PTXSubtarget
 119 } // namespace llvm
 120
 121 #endif // PTX_SUBTARGET_H