Also count identity copies.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130996 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/VirtRegMap.cpp b/lib/CodeGen/VirtRegMap.cpp
index 226b78f7bcbd2ba46f2f2888e04a149ffba89c4f..7557979ec9bb852cd05a823467570de47dc23951 100644 (file)
--- a/lib/CodeGen/VirtRegMap.cpp
+++ b/lib/CodeGen/VirtRegMap.cpp
@@ -42,6 +42,7 @@
 using namespace llvm;
 
 STATISTIC(NumSpills  , "Number of register spills");
+STATISTIC(NumIdCopies, "Number of identity moves eliminated after rewriting");
 
 //===----------------------------------------------------------------------===//
 //  VirtRegMap implementation
@@ -318,6 +319,7 @@ void VirtRegMap::rewrite(SlotIndexes *Indexes) {
 
       // Finally, remove any identity copies.
       if (MI->isIdentityCopy()) {
+        ++NumIdCopies;
         if (MI->getNumOperands() == 2) {
           DEBUG(dbgs() << "Deleting identity copy.\n");
           RemoveMachineInstrFromMaps(MI);