Improve ext/trunc patterns on PPC64.

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

diff --git a/lib/Target/PowerPC/PPCTargetMachine.cpp b/lib/Target/PowerPC/PPCTargetMachine.cpp
index f5be148399965bcbe13d6e37e84a4c540bd2d729..d7a808855bbb4f50640857363b862c690a735e0e 100644 (file)
--- a/lib/Target/PowerPC/PPCTargetMachine.cpp
+++ b/lib/Target/PowerPC/PPCTargetMachine.cpp
@@ -11,16 +11,21 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "PPC.h"
 #include "PPCTargetMachine.h"
+#include "PPC.h"
 #include "llvm/PassManager.h"
 #include "llvm/MC/MCStreamer.h"
 #include "llvm/CodeGen/Passes.h"
 #include "llvm/Target/TargetOptions.h"
+#include "llvm/Support/CommandLine.h"
 #include "llvm/Support/FormattedStream.h"
 #include "llvm/Support/TargetRegistry.h"
 using namespace llvm;
 
+static cl::
+opt<bool> DisableCTRLoops("disable-ppc-ctrloops", cl::Hidden,
+                        cl::desc("Disable CTR loops for PPC"));
+
 extern "C" void LLVMInitializePowerPCTarget() {
   // Register the targets
   RegisterTargetMachine<PPC32TargetMachine> A(ThePPC32Target);
@@ -39,6 +44,10 @@ PPCTargetMachine::PPCTargetMachine(const Target &T, StringRef TT,
     FrameLowering(Subtarget), JITInfo(*this, is64Bit),
     TLInfo(*this), TSInfo(*this),
     InstrItins(Subtarget.getInstrItineraryData()) {
+
+  // The binutils for the BG/P are too old for CFI.
+  if (Subtarget.isBGP())
+    setMCUseCFI(false);
 }
 
 void PPC32TargetMachine::anchor() { }
@@ -77,8 +86,8 @@ public:
     return getTM<PPCTargetMachine>();
   }
 
+  virtual bool addPreRegAlloc();
   virtual bool addInstSelector();
-  virtual bool getEnableTailMergeDefault() const;
   virtual bool addPreEmitPass();
 };
 } // namespace
@@ -87,19 +96,22 @@ TargetPassConfig *PPCTargetMachine::createPassConfig(PassManagerBase &PM) {
   return new PPCPassConfig(this, PM);
 }
 
+bool PPCPassConfig::addPreRegAlloc() {
+  if (!DisableCTRLoops && getOptLevel() != CodeGenOpt::None)
+    PM->add(createPPCCTRLoops());
+
+  return false;
+}
+
 bool PPCPassConfig::addInstSelector() {
   // Install an instruction selector.
-  PM.add(createPPCISelDag(getPPCTargetMachine()));
+  PM->add(createPPCISelDag(getPPCTargetMachine()));
   return false;
 }
 
-/// Override this for PowerPC.  Tail merging happily breaks up instruction issue
-/// groups, which typically degrades performance.
-bool PPCPassConfig::getEnableTailMergeDefault() const { return false; }
-
 bool PPCPassConfig::addPreEmitPass() {
   // Must run branch selection immediately preceding the asm printer.
-  PM.add(createPPCBranchSelectionPass());
+  PM->add(createPPCBranchSelectionPass());
   return false;
 }