PPCSubtarget.cpp revision 581a8f79bc1ac3cbe5d621f0b4a0252ab2890bc1 
1//===- PowerPCSubtarget.cpp - PPC Subtarget Information ---------*- C++ -*-===//
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
20using namespace llvm;
21PPCTargetEnum llvm::PPCTarget = TargetDefault;
22
23namespace 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.
41static 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
72PPCSubtarget::PPCSubtarget(const Module &M, const std::string &FS)
73  : StackAlignment(16)
74  , IsGigaProcessor(false)
75  , Is64Bit(false)
76  , Has64BitRegs(false)
77  , HasAltivec(false)
78  , HasFSQRT(false)
79  , IsAIX(false)
80  , IsDarwin(false) {
81
82  // Determine default and user specified characteristics
83  std::string CPU = "generic";
84#if defined(__APPLE__)
85  CPU = GetCurrentPowerPCCPU();
86#endif
87
88  // Parse features string.
89  ParseSubtargetFeatures(FS, CPU);
90
91  // Set the boolean corresponding to the current target triple, or the default
92  // if one cannot be determined, to true.
93  const std::string& TT = M.getTargetTriple();
94  if (TT.length() > 5) {
95    IsDarwin = TT.find("darwin") != std::string::npos;
96  } else if (TT.empty()) {
97#if defined(_POWER)
98    IsAIX = true;
99#elif defined(__APPLE__)
100    IsDarwin = true;
101#endif
102  }
103}
104