1 //===- NVPTXSubtarget.cpp - NVPTX Subtarget Information -------------------===//
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 implements the NVPTX specific subclass of TargetSubtarget.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "NVPTXSubtarget.h"
15 #include "NVPTXTargetMachine.h"
16
17 using namespace llvm;
18
19 #define DEBUG_TYPE "nvptx-subtarget"
20
21 #define GET_SUBTARGETINFO_ENUM
22 #define GET_SUBTARGETINFO_TARGET_DESC
23 #define GET_SUBTARGETINFO_CTOR
24 #include "NVPTXGenSubtargetInfo.inc"
25
26 static cl::opt<bool>
27 NoF16Math("nvptx-no-f16-math", cl::ZeroOrMore, cl::Hidden,
28 cl::desc("NVPTX Specific: Disable generation of f16 math ops."),
29 cl::init(false));
30
31 // Pin the vtable to this file.
anchor()32 void NVPTXSubtarget::anchor() {}
33
initializeSubtargetDependencies(StringRef CPU,StringRef FS)34 NVPTXSubtarget &NVPTXSubtarget::initializeSubtargetDependencies(StringRef CPU,
35 StringRef FS) {
36 // Provide the default CPU if we don't have one.
37 TargetName = CPU.empty() ? "sm_20" : CPU;
38
39 ParseSubtargetFeatures(TargetName, FS);
40
41 // Set default to PTX 3.2 (CUDA 5.5)
42 if (PTXVersion == 0) {
43 PTXVersion = 32;
44 }
45
46 return *this;
47 }
48
NVPTXSubtarget(const Triple & TT,const std::string & CPU,const std::string & FS,const NVPTXTargetMachine & TM)49 NVPTXSubtarget::NVPTXSubtarget(const Triple &TT, const std::string &CPU,
50 const std::string &FS,
51 const NVPTXTargetMachine &TM)
52 : NVPTXGenSubtargetInfo(TT, CPU, FS), PTXVersion(0), SmVersion(20), TM(TM),
53 InstrInfo(), TLInfo(TM, initializeSubtargetDependencies(CPU, FS)),
54 FrameLowering() {}
55
hasImageHandles() const56 bool NVPTXSubtarget::hasImageHandles() const {
57 // Enable handles for Kepler+, where CUDA supports indirect surfaces and
58 // textures
59 if (TM.getDrvInterface() == NVPTX::CUDA)
60 return (SmVersion >= 30);
61
62 // Disabled, otherwise
63 return false;
64 }
65
allowFP16Math() const66 bool NVPTXSubtarget::allowFP16Math() const {
67 return hasFP16Math() && NoF16Math == false;
68 }
69