MachineScheduler: Add a command line option to disable post scheduler.

llvm-svn: 258364

1 files changed, 9 insertions, 1 deletions

diff --git a/llvm/lib/CodeGen/MachineScheduler.cpp b/llvm/lib/CodeGen/MachineScheduler.cpp
index 81651aadcfd..a0a10ca276c 100644
--- a/llvm/lib/CodeGen/MachineScheduler.cpp
+++ b/llvm/lib/CodeGen/MachineScheduler.cpp
@@ -219,6 +219,11 @@ static cl::opt<bool> EnableMachineSched(
     cl::desc("Enable the machine instruction scheduling pass."), cl::init(true),
     cl::Hidden);
 
+static cl::opt<bool> EnablePostRAMachineSched(
+    "enable-post-misched",
+    cl::desc("Enable the post-ra machine instruction scheduling pass."),
+    cl::init(true), cl::Hidden);
+
 /// Forward declare the standard machine scheduler. This will be used as the
 /// default scheduler if the target does not set a default.
 static ScheduleDAGInstrs *createGenericSchedLive(MachineSchedContext *C);
@@ -355,7 +360,10 @@ bool PostMachineScheduler::runOnMachineFunction(MachineFunction &mf) {
   if (skipOptnoneFunction(*mf.getFunction()))
     return false;
 
-  if (!mf.getSubtarget().enablePostRAScheduler()) {
+  if (EnablePostRAMachineSched.getNumOccurrences()) {
+    if (!EnablePostRAMachineSched)
+      return false;
+  } else if (!mf.getSubtarget().enablePostRAScheduler()) {
     DEBUG(dbgs() << "Subtarget disables post-MI-sched.\n");
     return false;
   }