misched: Allow subtargets to enable misched and dependent options.

This allows me to begin enabling (or backing out) misched by default
for one subtarget at a time. To run misched we typically want to:
- Disable SelectionDAG scheduling (use the source order scheduler)
- Enable more aggressive coalescing (until we decide to always run the coalescer this way)
- Enable MachineScheduler pass itself.

Disabling PostRA sched may follow for some subtargets.

llvm-svn: 167826

1 files changed, 2 insertions, 2 deletions

diff --git a/llvm/lib/CodeGen/MachineScheduler.cpp b/llvm/lib/CodeGen/MachineScheduler.cpp
index ee8138c0c49..8d43360e675 100644
--- a/llvm/lib/CodeGen/MachineScheduler.cpp
+++ b/llvm/lib/CodeGen/MachineScheduler.cpp
@@ -60,11 +60,11 @@ static cl::opt<unsigned> ILPWindow("ilp-window", cl::Hidden,
 
 // Experimental heuristics
 static cl::opt<bool> EnableLoadCluster("misched-cluster", cl::Hidden,
-  cl::desc("Enable load clustering."));
+  cl::desc("Enable load clustering."), cl::init(true));
 
 // Experimental heuristics
 static cl::opt<bool> EnableMacroFusion("misched-fusion", cl::Hidden,
-  cl::desc("Enable scheduling for macro fusion."));
+  cl::desc("Enable scheduling for macro fusion."), cl::init(true));
 
 //===----------------------------------------------------------------------===//
 // Machine Instruction Scheduling Pass and Registry