From ba662b351c937958f586dac232394bd8393f3998 Mon Sep 17 00:00:00 2001
From: James Y Knight <jyknight@google.com>
Date: Thu, 10 Sep 2015 18:20:45 +0000
Subject: [PATCH] [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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@247315 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/Sparc/SparcSubtarget.cpp | 4 ++++
 lib/Target/Sparc/SparcSubtarget.h   | 3 ++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/lib/Target/Sparc/SparcSubtarget.cpp b/lib/Target/Sparc/SparcSubtarget.cpp
index 6bf8d413062..d701594d27a 100644
--- a/lib/Target/Sparc/SparcSubtarget.cpp
+++ b/lib/Target/Sparc/SparcSubtarget.cpp
@@ -81,3 +81,7 @@ int SparcSubtarget::getAdjustedFrameSize(int frameSize) const {
   }
   return frameSize;
 }
+
+bool SparcSubtarget::enableMachineScheduler() const {
+  return true;
+}
diff --git a/lib/Target/Sparc/SparcSubtarget.h b/lib/Target/Sparc/SparcSubtarget.h
index 9d21911d88f..e2fd2f04528 100644
--- a/lib/Target/Sparc/SparcSubtarget.h
+++ b/lib/Target/Sparc/SparcSubtarget.h
@@ -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
-- 
2.34.1