Add a target hook to add pre- post-regalloc scheduling passes.

llvm-svn: 83144

llvm/include/llvm/Target/TargetMachine.h

@@ -362,20 +362,28 @@ public:
     return true;
   }
 
-  /// addPreRegAllocPasses - This method may be implemented by targets that want
-  /// to run passes immediately before register allocation. This should return
+  /// addPreRegAlloc - This method may be implemented by targets that want to
+  /// run passes immediately before register allocation. This should return
   /// true if -print-machineinstrs should print after these passes.
   virtual bool addPreRegAlloc(PassManagerBase &, CodeGenOpt::Level) {
     return false;
   }
 
-  /// addPostRegAllocPasses - This method may be implemented by targets that
-  /// want to run passes after register allocation but before prolog-epilog
+  /// addPostRegAlloc - This method may be implemented by targets that want
+  /// to run passes after register allocation but before prolog-epilog
   /// insertion.  This should return true if -print-machineinstrs should print
   /// after these passes.
   virtual bool addPostRegAlloc(PassManagerBase &, CodeGenOpt::Level) {
     return false;
   }
+
+  /// addPreSched2 - This method may be implemented by targets that want to
+  /// run passes after prolog-epilog insertion and before the second instruction
+  /// scheduling pass.  This should return true if -print-machineinstrs should
+  /// print after these passes.
+  virtual bool addPreSched2(PassManagerBase &, CodeGenOpt::Level) {
+    return false;
+  }
   
   /// addPreEmitPass - This pass may be implemented by targets that want to run
   /// passes immediately before machine code is emitted.  This should return

llvm/lib/CodeGen/LLVMTargetMachine.cpp

@@ -317,6 +317,10 @@ bool LLVMTargetMachine::addCommonCodeGenPasses(PassManagerBase &PM,
   PM.add(createPrologEpilogCodeInserter());
   printAndVerify(PM);
 
+  // Run pre-sched2 passes.
+  if (addPreSched2(PM, OptLevel))
+    printAndVerify(PM);
+
   // Second pass scheduler.
   if (OptLevel != CodeGenOpt::None) {
     PM.add(createPostRAScheduler());