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.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167826 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/TargetSubtargetInfo.cpp b/lib/Target/TargetSubtargetInfo.cpp
index 59ffdea..af0cef6 100644
--- a/lib/Target/TargetSubtargetInfo.cpp
+++ b/lib/Target/TargetSubtargetInfo.cpp
@@ -22,6 +22,10 @@
TargetSubtargetInfo::~TargetSubtargetInfo() {}
+bool TargetSubtargetInfo::enableMachineScheduler() const {
+ return false;
+}
+
bool TargetSubtargetInfo::enablePostRAScheduler(
CodeGenOpt::Level OptLevel,
AntiDepBreakMode& Mode,