Explicitly declare a library dependency of LLVM*Desc to

[oota-llvm.git] / lib / Target / PowerPC / PPCSubtarget.cpp

diff --git a/lib/Target/PowerPC/PPCSubtarget.cpp b/lib/Target/PowerPC/PPCSubtarget.cpp
index 0a1e6a78371d9cd1d3ae156974d892bcb07fddfc..5ea9b0f6596c46ebe1b9e598d2f9b6fcf824ff41 100644 (file)
--- a/lib/Target/PowerPC/PPCSubtarget.cpp
+++ b/lib/Target/PowerPC/PPCSubtarget.cpp
@@ -7,15 +7,21 @@
 //
 //===----------------------------------------------------------------------===//
 //
-// This file implements the PPC specific subclass of TargetSubtarget.
+// This file implements the PPC specific subclass of TargetSubtargetInfo.
 //
 //===----------------------------------------------------------------------===//
 
 #include "PPCSubtarget.h"
 #include "PPC.h"
-#include "llvm/Module.h"
+#include "llvm/GlobalValue.h"
 #include "llvm/Target/TargetMachine.h"
-#include "PPCGenSubtarget.inc"
+#include "llvm/Target/TargetRegistry.h"
+#include <cstdlib>
+
+#define GET_SUBTARGETINFO_TARGET_DESC
+#define GET_SUBTARGETINFO_CTOR
+#include "PPCGenSubtargetInfo.inc"
+
 using namespace llvm;
 
 #if defined(__APPLE__)
@@ -56,10 +62,11 @@ static const char *GetCurrentPowerPCCPU() {
 #endif
 
 
-PPCSubtarget::PPCSubtarget(const TargetMachine &tm, const Module &M,
+PPCSubtarget::PPCSubtarget(const std::string &TT, const std::string &CPU,
                            const std::string &FS, bool is64Bit)
-  : TM(tm)
+  : PPCGenSubtargetInfo(TT, CPU, FS)
   , StackAlignment(16)
+  , DarwinDirective(PPC::DIR_NONE)
   , IsGigaProcessor(false)
   , Has64BitSupport(false)
   , Use64BitRegs(false)
@@ -68,66 +75,39 @@ PPCSubtarget::PPCSubtarget(const TargetMachine &tm, const Module &M,
   , HasFSQRT(false)
   , HasSTFIWX(false)
   , HasLazyResolverStubs(false)
-  , DarwinVers(0) {
+  , IsJITCodeModel(false)
+  , TargetTriple(TT) {
 
   // Determine default and user specified characteristics
-  std::string CPU = "generic";
+  std::string CPUName = CPU;
+  if (CPUName.empty())
+    CPUName = "generic";
 #if defined(__APPLE__)
-  CPU = GetCurrentPowerPCCPU();
+  if (CPUName == "generic")
+    CPUName = GetCurrentPowerPCCPU();
 #endif
 
   // Parse features string.
-  ParseSubtargetFeatures(FS, CPU);
+  ParseSubtargetFeatures(CPUName, FS);
+
+  // Initialize scheduling itinerary for the specified CPU.
+  InstrItins = getInstrItineraryForCPU(CPUName);
 
   // If we are generating code for ppc64, verify that options make sense.
   if (is64Bit) {
-    if (!has64BitSupport()) {
-      cerr << "PPC: Generation of 64-bit code for a 32-bit processor "
-           << "requested.  Ignoring 32-bit processor feature.\n";
-      Has64BitSupport = true;
-    }
+    Has64BitSupport = true;
     // Silently force 64-bit register use on ppc64.
     Use64BitRegs = true;
   }
   
   // If the user requested use of 64-bit regs, but the cpu selected doesn't
-  // support it, warn and ignore.
-  if (use64BitRegs() && !has64BitSupport()) {
-    cerr << "PPC: 64-bit registers requested on CPU without support.  "
-         << "Disabling 64-bit register use.\n";
+  // support it, ignore.
+  if (use64BitRegs() && !has64BitSupport())
     Use64BitRegs = false;
-  }
-  
-  // Set the boolean corresponding to the current target triple, or the default
-  // if one cannot be determined, to true.
-  const std::string &TT = M.getTargetTriple();
-  if (TT.length() > 7) {
-    // Determine which version of darwin this is.
-    unsigned DarwinPos = TT.find("-darwin");
-    if (DarwinPos != std::string::npos) {
-      if (isdigit(TT[DarwinPos+7]))
-        DarwinVers = atoi(&TT[DarwinPos+7]);
-      else
-        DarwinVers = 8;  // Minimum supported darwin is Tiger.
-    }
-  } else if (TT.empty()) {
-    // Try to autosense the subtarget from the host compiler.
-#if defined(__APPLE__)
-#if __APPLE_CC__ > 5400
-    DarwinVers = 9;  // GCC 5400+ is Leopard.
-#else
-    DarwinVers = 8;  // Minimum supported darwin is Tiger.
-#endif
-#endif
-  }
 
   // Set up darwin-specific properties.
-  if (isDarwin()) {
+  if (isDarwin())
     HasLazyResolverStubs = true;
-    AsmFlavor = NewMnemonic;
-  } else {
-    AsmFlavor = OldMnemonic;
-  }
 }
 
 /// SetJITMode - This is called to inform the subtarget info that we are
@@ -137,17 +117,25 @@ void PPCSubtarget::SetJITMode() {
   // everything is.  This matters for PPC64, which codegens in PIC mode without
   // stubs.
   HasLazyResolverStubs = false;
+
+  // Calls to external functions need to use indirect calls
+  IsJITCodeModel = true;
 }
 
 
 /// hasLazyResolverStub - Return true if accesses to the specified global have
 /// to go through a dyld lazy resolution stub.  This means that an extra load
 /// is required to get the address of the global.
-bool PPCSubtarget::hasLazyResolverStub(const GlobalValue *GV) const {
-  // We never hae stubs if HasLazyResolverStubs=false or if in static mode.
+bool PPCSubtarget::hasLazyResolverStub(const GlobalValue *GV,
+                                       const TargetMachine &TM) const {
+  // We never have stubs if HasLazyResolverStubs=false or if in static mode.
   if (!HasLazyResolverStubs || TM.getRelocationModel() == Reloc::Static)
     return false;
-  
+  // If symbol visibility is hidden, the extra load is not needed if
+  // the symbol is definitely defined in the current translation unit.
+  bool isDecl = GV->isDeclaration() && !GV->isMaterializable();
+  if (GV->hasHiddenVisibility() && !isDecl && !GV->hasCommonLinkage())
+    return false;
   return GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() ||
-         (GV->isDeclaration() && !GV->hasNotBeenReadFromBitcode());
+         GV->hasCommonLinkage() || isDecl;
 }