Revert "Disable codegen prepare critical edge splitting. Machine instruction passes now"

This reverts revision 114633. It was breaking llvm-gcc-i386-linux-selfhost.

It seems there is a downstream bug that is exposed by
-cgp-critical-edge-splitting=0. When that bug is fixed, this patch can go back
in.

Note that the changes to tailcallfp2.ll are not reverted. They were good are
required.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@114859 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 1 insertions, 5 deletions

diff --git a/lib/Transforms/Scalar/CodeGenPrepare.cpp b/lib/Transforms/Scalar/CodeGenPrepare.cpp
index 880a4e5eb8..3221e14347 100644
--- a/lib/Transforms/Scalar/CodeGenPrepare.cpp
+++ b/lib/Transforms/Scalar/CodeGenPrepare.cpp
@@ -31,7 +31,6 @@
 #include "llvm/Transforms/Utils/BuildLibCalls.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/SmallSet.h"
-#include "llvm/ADT/Statistic.h"
 #include "llvm/Assembly/Writer.h"
 #include "llvm/Support/CallSite.h"
 #include "llvm/Support/CommandLine.h"
@@ -43,12 +42,10 @@
 using namespace llvm;
 using namespace llvm::PatternMatch;
 
-STATISTIC(NumElim,  "Number of blocks eliminated");
-
 static cl::opt<bool>
 CriticalEdgeSplit("cgp-critical-edge-splitting",
                   cl::desc("Split critical edges during codegen prepare"),
-                  cl::init(false), cl::Hidden);
+                  cl::init(true), cl::Hidden);
 
 namespace {
   class CodeGenPrepare : public FunctionPass {
@@ -305,7 +302,6 @@ void CodeGenPrepare::EliminateMostlyEmptyBlock(BasicBlock *BB) {
     PFI->removeEdge(ProfileInfo::getEdge(BB, DestBB));
   }
   BB->eraseFromParent();
-  ++NumElim;
 
   DEBUG(dbgs() << "AFTER:\n" << *DestBB << "\n\n\n");
 }