NVPTXSubtarget.cpp revision b21ab43cfc3fa0dacf5c95f04e58b6d804b59a16 
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#define GET_SUBTARGETINFO_ENUM
16#define GET_SUBTARGETINFO_TARGET_DESC
17#define GET_SUBTARGETINFO_CTOR
18#include "NVPTXGenSubtargetInfo.inc"
19
20using namespace llvm;
21
22
23NVPTXSubtarget::NVPTXSubtarget(const std::string &TT, const std::string &CPU,
24                               const std::string &FS, bool is64Bit)
25    : NVPTXGenSubtargetInfo(TT, CPU, FS), Is64Bit(is64Bit), PTXVersion(0),
26      SmVersion(20) {
27
28  Triple T(TT);
29
30  if (T.getOS() == Triple::NVCL)
31    drvInterface = NVPTX::NVCL;
32  else
33    drvInterface = NVPTX::CUDA;
34
35  // Provide the default CPU if none
36  std::string defCPU = "sm_20";
37
38  ParseSubtargetFeatures((CPU.empty() ? defCPU : CPU), FS);
39
40  // Get the TargetName from the FS if available
41  if (FS.empty() && CPU.empty())
42    TargetName = defCPU;
43  else if (!CPU.empty())
44    TargetName = CPU;
45  else
46    llvm_unreachable("we are not using FeatureStr");
47
48  // We default to PTX 3.1, but we cannot just default to it in the initializer
49  // since the attribute parser checks if the given option is >= the default.
50  // So if we set ptx31 as the default, the ptx30 attribute would never match.
51  // Instead, we use 0 as the default and manually set 31 if the default is
52  // used.
53  if (PTXVersion == 0) {
54    PTXVersion = 31;
55  }
56}
57