[llvm] r247315 - [SPARC] Switch to the Machine Scheduler.

[James Y Knight via llvm-commits]

Author: jyknight
Date: Thu Sep 10 13:20:45 2015
New Revision: 247315

URL: http://llvm.org/viewvc/llvm-project?rev=247315&view=rev
Log:
[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.

Modified:
    llvm/trunk/lib/Target/Sparc/SparcSubtarget.cpp
    llvm/trunk/lib/Target/Sparc/SparcSubtarget.h

Modified: llvm/trunk/lib/Target/Sparc/SparcSubtarget.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/Sparc/SparcSubtarget.cpp?rev=247315&r1=247314&r2=247315&view=diff
==============================================================================
--- llvm/trunk/lib/Target/Sparc/SparcSubtarget.cpp (original)
+++ llvm/trunk/lib/Target/Sparc/SparcSubtarget.cpp Thu Sep 10 13:20:45 2015
@@ -81,3 +81,7 @@ int SparcSubtarget::getAdjustedFrameSize
   }
   return frameSize;
 }
+
+bool SparcSubtarget::enableMachineScheduler() const {
+  return true;
+}

Modified: llvm/trunk/lib/Target/Sparc/SparcSubtarget.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/Sparc/SparcSubtarget.h?rev=247315&r1=247314&r2=247315&view=diff
==============================================================================
--- llvm/trunk/lib/Target/Sparc/SparcSubtarget.h (original)
+++ llvm/trunk/lib/Target/Sparc/SparcSubtarget.h Thu Sep 10 13:20:45 2015
@@ -60,6 +60,8 @@ public:
     return &TSInfo;
   }
 
+  bool enableMachineScheduler() const override;
+
   bool isV9() const { return IsV9; }
   bool isVIS() const { return IsVIS; }
   bool isVIS2() const { return IsVIS2; }
@@ -85,7 +87,6 @@ public:
   /// returns adjusted framesize which includes space for register window
   /// spills and arguments.
   int getAdjustedFrameSize(int stackSize) const;
-
 };
 
 } // end namespace llvm