llvm/lib/Target/NVPTX/NVPTXSubtarget.cpp

   1 //===- NVPTXSubtarget.cpp - NVPTX Subtarget Information -------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file implements the NVPTX specific subclass of TargetSubtarget.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "NVPTXSubtarget.h"
  14 #include "NVPTXTargetMachine.h"
  15
  16 using namespace llvm;
  17
  18 #define DEBUG_TYPE "nvptx-subtarget"
  19
  20 #define GET_SUBTARGETINFO_ENUM
  21 #define GET_SUBTARGETINFO_TARGET_DESC
  22 #define GET_SUBTARGETINFO_CTOR
  23 #include "NVPTXGenSubtargetInfo.inc"
  24
  25 static cl::opt<bool>
  26     NoF16Math("nvptx-no-f16-math", cl::ZeroOrMore, cl::Hidden,
  27               cl::desc("NVPTX Specific: Disable generation of f16 math ops."),
  28               cl::init(false));
  29
  30 // Pin the vtable to this file.
  31 void NVPTXSubtarget::anchor() {}
  32
  33 NVPTXSubtarget &NVPTXSubtarget::initializeSubtargetDependencies(StringRef CPU,
  34                                                                 StringRef FS) {
  35     // Provide the default CPU if we don't have one.
  36     TargetName = std::string(CPU.empty() ? "sm_20" : CPU);
  37
  38     ParseSubtargetFeatures(TargetName, /*TuneCPU*/ TargetName, FS);
  39
  40     // Set default to PTX 3.2 (CUDA 5.5)
  41     if (PTXVersion == 0) {
  42       PTXVersion = 32;
  43   }
  44
  45   return *this;
  46 }
  47
  48 NVPTXSubtarget::NVPTXSubtarget(const Triple &TT, const std::string &CPU,
  49                                const std::string &FS,
  50                                const NVPTXTargetMachine &TM)
  51     : NVPTXGenSubtargetInfo(TT, CPU, /*TuneCPU*/ CPU, FS), PTXVersion(0),
  52       SmVersion(20), TM(TM), InstrInfo(),
  53       TLInfo(TM, initializeSubtargetDependencies(CPU, FS)), FrameLowering() {}
  54
  55 bool NVPTXSubtarget::hasImageHandles() const {
  56   // Enable handles for Kepler+, where CUDA supports indirect surfaces and
  57   // textures
  58   if (TM.getDrvInterface() == NVPTX::CUDA)
  59     return (SmVersion >= 30);
  60
  61   // Disabled, otherwise
  62   return false;
  63 }
  64
  65 bool NVPTXSubtarget::allowFP16Math() const {
  66   return hasFP16Math() && NoF16Math == false;
  67 }