lib/Target/Sparc/SparcSubtarget.cpp

   1 //===- SparcSubtarget.cpp - SPARC 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 SPARC specific subclass of TargetSubtarget.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "SparcSubtarget.h"
  15 #include "SparcGenSubtarget.inc"
  16 using namespace llvm;
  17
  18 // FIXME: temporary.
  19 #include "llvm/Support/CommandLine.h"
  20 namespace {
  21   cl::opt<bool> EnableV9("enable-sparc-v9-insts", cl::Hidden,
  22                           cl::desc("Enable V9 instructions in the V8 target"));
  23 }
  24
  25 SparcSubtarget::SparcSubtarget(const Module &M, const std::string &FS) {
  26   // Set the default features.
  27   IsV9 = false;
  28   V8DeprecatedInsts = false;
  29   IsVIS = false;
  30
  31   // Determine default and user specified characteristics
  32   std::string CPU = "generic";
  33
  34   // FIXME: autodetect host here!
  35   CPU = "v9";   // What is a good way to detect V9?
  36
  37   // Parse features string.
  38   ParseSubtargetFeatures(FS, CPU);
  39
  40   // Unless explicitly enabled, disable the V9 instructions.
  41   if (!EnableV9)
  42     IsV9 = false;
  43 }