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::Hidden,
  27               cl::desc("NVPTX Specific: Disable generation of f16 math ops."),
  28               cl::init(false));
  29 // Pin the vtable to this file.
  30 void NVPTXSubtarget::anchor() {}
  31
  32 NVPTXSubtarget &NVPTXSubtarget::initializeSubtargetDependencies(StringRef CPU,
  33                                                                 StringRef FS) {
  34     // Provide the default CPU if we don't have one.
  35     TargetName = std::string(CPU.empty() ? "sm_30" : CPU);
  36
  37     ParseSubtargetFeatures(TargetName, /*TuneCPU*/ TargetName, FS);
  38
  39     // Re-map SM version numbers, SmVersion carries the regular SMs which do
  40     // have relative order, while FullSmVersion allows distinguishing sm_90 from
  41     // sm_90a, which would *not* be a subset of sm_91.
  42     SmVersion = getSmVersion();
  43
  44     // Set default to PTX 6.0 (CUDA 9.0)
  45     if (PTXVersion == 0) {
  46       PTXVersion = 60;
  47   }
  48
  49   return *this;
  50 }
  51
  52 NVPTXSubtarget::NVPTXSubtarget(const Triple &TT, const std::string &CPU,
  53                                const std::string &FS,
  54                                const NVPTXTargetMachine &TM)
  55     : NVPTXGenSubtargetInfo(TT, CPU, /*TuneCPU*/ CPU, FS), PTXVersion(0),
  56       FullSmVersion(200), SmVersion(getSmVersion()), TM(TM),
  57       TLInfo(TM, initializeSubtargetDependencies(CPU, FS)) {}
  58
  59 bool NVPTXSubtarget::hasImageHandles() const {
  60   // Enable handles for Kepler+, where CUDA supports indirect surfaces and
  61   // textures
  62   if (TM.getDrvInterface() == NVPTX::CUDA)
  63     return (SmVersion >= 30);
  64
  65   // Disabled, otherwise
  66   return false;
  67 }
  68
  69 bool NVPTXSubtarget::allowFP16Math() const {
  70   return hasFP16Math() && NoF16Math == false;
  71 }