Do a scheduling pass ignoring anti-dependencies to identify candidate registers that should be renamed.

llvm-svn: 85939

llvm-svn: 84244

llvm-svn: 82709

llvm-svn: 82554

llvm-svn: 80997

llvm-svn: 80962

llvm-svn: 79750

Extend the instruction itinerary model to include the ability to indicate the def and use cycle for each operand. This additional information is optional, so existing itineraries do not need to be changed.

llvm-svn: 79247

Enhance the InstrStage object to enable the specification of an Itinerary with overlapping stages. The default is to maintain the current behavior that the "next" stage immediately follows the previous one.

llvm-svn: 78827

llvm-svn: 78736

 - Since the function is never called in NDEBUG mode, just dropped the DEBUG()
   uses here.

llvm-svn: 78649

llvm-svn: 78634

Post RA scheduler changes. Introduce a hazard recognizer that uses the target schedule information to accurately model the pipeline. Update the scheduler to correctly handle multi-issue targets.

llvm-svn: 78563