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 50f3db8b27fdaabfabeec0738e7535020422e507..d7a808855bbb4f50640857363b862c690a735e0e 100644 (file)
--- a/lib/Target/PowerPC/PPCTargetMachine.cpp
+++ b/lib/Target/PowerPC/PPCTargetMachine.cpp
@@ -17,10 +17,15 @@
 #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);
@@ -81,19 +86,21 @@ public:
     return getTM<PPCTargetMachine>();
   }
 
+  virtual bool addPreRegAlloc();
   virtual bool addInstSelector();
   virtual bool addPreEmitPass();
 };
 } // namespace
 
 TargetPassConfig *PPCTargetMachine::createPassConfig(PassManagerBase &PM) {
-  TargetPassConfig *PassConfig = new PPCPassConfig(this, PM);
+  return new PPCPassConfig(this, PM);
+}
 
-  // Override this for PowerPC.  Tail merging happily breaks up instruction issue
-  // groups, which typically degrades performance.
-  PassConfig->setEnableTailMerge(false);
+bool PPCPassConfig::addPreRegAlloc() {
+  if (!DisableCTRLoops && getOptLevel() != CodeGenOpt::None)
+    PM->add(createPPCCTRLoops());
 
-  return PassConfig;
+  return false;
 }
 
 bool PPCPassConfig::addInstSelector() {