[PowerPC] Add an MI SSA peephole pass.

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

diff --git a/lib/Target/PowerPC/PPCTargetMachine.cpp b/lib/Target/PowerPC/PPCTargetMachine.cpp
index 7485d1ba9783688e546c92d13d582b63cf562be9..24a9ef0ef077189a14d480256710cf1f5ddf88dc 100644 (file)
--- a/lib/Target/PowerPC/PPCTargetMachine.cpp
+++ b/lib/Target/PowerPC/PPCTargetMachine.cpp
@@ -42,6 +42,10 @@ static cl::
 opt<bool> DisableVSXSwapRemoval("disable-ppc-vsx-swap-removal", cl::Hidden,
                                 cl::desc("Disable VSX Swap Removal for PPC"));
 
+static cl::
+opt<bool> DisableMIPeephole("disable-ppc-peephole", cl::Hidden,
+                            cl::desc("Disable machine peepholes for PPC"));
+
 static cl::opt<bool>
 EnableGEPOpt("ppc-gep-opt", cl::Hidden,
              cl::desc("Enable optimizations on complex GEPs"),
@@ -149,7 +153,7 @@ static PPCTargetMachine::PPCABI computeTargetABI(const Triple &TT,
     return PPCTargetMachine::PPC_ABI_ELFv2;
 
   assert(Options.MCOptions.getABIName().empty() &&
-        "Unknown target-abi option!");
+         "Unknown target-abi option!");
 
   if (!TT.isMacOSX()) {
     switch (TT.getArch()) {
@@ -348,6 +352,12 @@ void PPCPassConfig::addMachineSSAOptimization() {
   if (TM->getTargetTriple().getArch() == Triple::ppc64le &&
       !DisableVSXSwapRemoval)
     addPass(createPPCVSXSwapRemovalPass());
+  // Target-specific peephole cleanups performed after instruction
+  // selection.
+  if (!DisableMIPeephole) {
+    addPass(createPPCMIPeepholePass());
+    addPass(&DeadMachineInstructionElimID);
+  }
 }
 
 void PPCPassConfig::addPreRegAlloc() {