[SPARC] Switch to the Machine Scheduler.

The (mostly-deprecated) SelectionDAG-based ILPListDAGScheduler scheduler
was making poor scheduling decisions, causing high register pressure and
extraneous register spills.

Switching to the newer machine scheduler generates better code -- even
without there being a machine model defined for SPARC yet.

llvm-svn: 247315

1 files changed, 4 insertions, 0 deletions

diff --git a/llvm/lib/Target/Sparc/SparcSubtarget.cpp b/llvm/lib/Target/Sparc/SparcSubtarget.cpp
index 6bf8d41..d701594 100644
--- a/llvm/lib/Target/Sparc/SparcSubtarget.cpp
+++ b/llvm/lib/Target/Sparc/SparcSubtarget.cpp
@@ -81,3 +81,7 @@ int SparcSubtarget::getAdjustedFrameSize(int frameSize) const {
   }
   return frameSize;
 }
+
+bool SparcSubtarget::enableMachineScheduler() const {
+  return true;
+}