[mips] Use MFHC1 when it is available (MIPS32r2 and later) for both FP32 and FP64...

[oota-llvm.git] / lib / Target / TargetSubtargetInfo.cpp

diff --git a/lib/Target/TargetSubtargetInfo.cpp b/lib/Target/TargetSubtargetInfo.cpp
index af0cef62d552cce8101d73fbd4f2e19462f8a5b6..87b6b661d318f27487225e0553259de2ff14624e 100644 (file)
--- a/lib/Target/TargetSubtargetInfo.cpp
+++ b/lib/Target/TargetSubtargetInfo.cpp
@@ -11,8 +11,9 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/Target/TargetSubtargetInfo.h"
+#include "llvm/Support/CommandLine.h"
 #include "llvm/ADT/SmallVector.h"
+#include "llvm/Target/TargetSubtargetInfo.h"
 using namespace llvm;
 
 //---------------------------------------------------------------------------
@@ -22,10 +23,39 @@ TargetSubtargetInfo::TargetSubtargetInfo() {}
 
 TargetSubtargetInfo::~TargetSubtargetInfo() {}
 
+// Temporary option to compare overall performance change when moving from the
+// SD scheduler to the MachineScheduler pass pipeline. This is convenient for
+// benchmarking during the transition from SD to MI scheduling. Once armv7 makes
+// the switch, it should go away. The normal way to enable/disable the
+// MachineScheduling pass itself is by using -enable-misched. For targets that
+// already use MI sched (via MySubTarget::enableMachineScheduler())
+// -misched-bench=false negates the subtarget hook.
+static cl::opt<bool> BenchMachineSched("misched-bench", cl::Hidden,
+    cl::desc("Migrate from the target's default SD scheduler to MI scheduler"));
+
+bool TargetSubtargetInfo::useMachineScheduler() const {
+  if (BenchMachineSched.getNumOccurrences())
+    return BenchMachineSched;
+  return enableMachineScheduler();
+}
+
+bool TargetSubtargetInfo::enableAtomicExpandLoadLinked() const {
+  return true;
+}
+
 bool TargetSubtargetInfo::enableMachineScheduler() const {
   return false;
 }
 
+bool TargetSubtargetInfo::enableRALocalReassignment(
+    CodeGenOpt::Level OptLevel) const {
+  return true;
+}
+
+bool TargetSubtargetInfo::enablePostMachineScheduler() const {
+  return false;
+}
+
 bool TargetSubtargetInfo::enablePostRAScheduler(
           CodeGenOpt::Level OptLevel,
           AntiDepBreakMode& Mode,
@@ -35,3 +65,6 @@ bool TargetSubtargetInfo::enablePostRAScheduler(
   return false;
 }
 
+bool TargetSubtargetInfo::useAA() const {
+  return false;
+}