lib/Target/PowerPC/PPCSubtarget.cpp

   1 //===- PowerPCSubtarget.cpp - PPC Subtarget Information -------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file was developed by Nate Begeman and is distributed under the
   6 // University of Illinois Open Source License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file implements the PPC specific subclass of TargetSubtarget.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "PPCSubtarget.h"
  15 #include "PPC.h"
  16 #include "llvm/Module.h"
  17 #include "llvm/Support/CommandLine.h"
  18 #include "PPCGenSubtarget.inc"
  19
  20 using namespace llvm;
  21 PPCTargetEnum llvm::PPCTarget = TargetDefault;
  22
  23 namespace llvm {
  24   cl::opt<PPCTargetEnum, true>
  25   PPCTargetArg(cl::desc("Force generation of code for a specific PPC target:"),
  26                cl::values(
  27                           clEnumValN(TargetAIX,  "aix", "  Enable AIX codegen"),
  28                           clEnumValN(TargetDarwin,"darwin",
  29                                      "  Enable Darwin codegen"),
  30                           clEnumValEnd),
  31                cl::location(PPCTarget), cl::init(TargetDefault));
  32 }
  33
  34 #if defined(__APPLE__)
  35 #include <mach/mach.h>
  36 #include <mach/mach_host.h>
  37 #include <mach/host_info.h>
  38 #include <mach/machine.h>
  39
  40 /// GetCurrentPowerPCFeatures - Returns the current CPUs features.
  41 static const char *GetCurrentPowerPCCPU() {
  42   host_basic_info_data_t hostInfo;
  43   mach_msg_type_number_t infoCount;
  44
  45   infoCount = HOST_BASIC_INFO_COUNT;
  46   host_info(mach_host_self(), HOST_BASIC_INFO, (host_info_t)&hostInfo,
  47             &infoCount);
  48
  49   if (hostInfo.cpu_type != CPU_TYPE_POWERPC) return "generic";
  50
  51   switch(hostInfo.cpu_subtype) {
  52   case CPU_SUBTYPE_POWERPC_601:   return "601";
  53   case CPU_SUBTYPE_POWERPC_602:   return "602";
  54   case CPU_SUBTYPE_POWERPC_603:   return "603";
  55   case CPU_SUBTYPE_POWERPC_603e:  return "603e";
  56   case CPU_SUBTYPE_POWERPC_603ev: return "603ev";
  57   case CPU_SUBTYPE_POWERPC_604:   return "604";
  58   case CPU_SUBTYPE_POWERPC_604e:  return "604e";
  59   case CPU_SUBTYPE_POWERPC_620:   return "620";
  60   case CPU_SUBTYPE_POWERPC_750:   return "750";
  61   case CPU_SUBTYPE_POWERPC_7400:  return "7400";
  62   case CPU_SUBTYPE_POWERPC_7450:  return "7450";
  63   case CPU_SUBTYPE_POWERPC_970:   return "970";
  64   default: ;
  65   }
  66
  67   return "generic";
  68 }
  69 #endif
  70
  71
  72 PPCSubtarget::PPCSubtarget(const Module &M, const std::string &FS)
  73   : StackAlignment(16)
  74   , InstrItins()
  75   , IsGigaProcessor(false)
  76   , Is64Bit(false)
  77   , Has64BitRegs(false)
  78   , HasAltivec(false)
  79   , HasFSQRT(false)
  80   , HasSTFIWX(false)
  81   , IsAIX(false)
  82   , IsDarwin(false) {
  83
  84   // Determine default and user specified characteristics
  85   std::string CPU = "generic";
  86 #if defined(__APPLE__)
  87   CPU = GetCurrentPowerPCCPU();
  88 #endif
  89
  90   // Parse features string.
  91   ParseSubtargetFeatures(FS, CPU);
  92
  93   // Set the boolean corresponding to the current target triple, or the default
  94   // if one cannot be determined, to true.
  95   const std::string& TT = M.getTargetTriple();
  96   if (TT.length() > 5) {
  97     IsDarwin = TT.find("darwin") != std::string::npos;
  98   } else if (TT.empty()) {
  99 #if defined(_POWER)
 100     IsAIX = true;
 101 #elif defined(__APPLE__)
 102     IsDarwin = true;
 103 #endif
 104   }
 105 }