Enable improved spilling costs by default. This speeds up viterbi on x86

by 40%, FreeBench/fourinarow by 20%, and many other programs 10-25%.

On PPC, this speeds up fourinarow by 18%, and probably other things as well.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31504 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/LiveIntervalAnalysis.cpp

@@ -59,9 +59,6 @@ namespace {
   EnableJoining("join-liveintervals",
                 cl::desc("Coallesce copies (default=true)"),
                 cl::init(true));
-  static cl::opt<bool>
-  EnableReweight("enable-majik-f00");
-  
 }
 
 void LiveIntervals::getAnalysisUsage(AnalysisUsage &AU) const {
@@ -221,7 +218,6 @@ bool LiveIntervals::runOnMachineFunction(MachineFunction &fn) {
       if (isZeroLengthInterval(&LI))
         LI.weight = HUGE_VALF;
       
-      if (EnableReweight) {
       // Divide the weight of the interval by its size.  This encourages 
       // spilling of intervals that are large and have few uses, and
       // discourages spilling of small intervals with many uses.
@@ -232,7 +228,6 @@ bool LiveIntervals::runOnMachineFunction(MachineFunction &fn) {
       LI.weight /= Size;
     }
   }
-  }
 
   DEBUG(dump());
   return true;