[llvm] r255253 - [WebAssembly] Make WebAssemblyStoreResults only return true when it has a change.

[Dan Gohman via llvm-commits]

Author: djg
Date: Thu Dec 10 08:17:36 2015
New Revision: 255253

URL: http://llvm.org/viewvc/llvm-project?rev=255253&view=rev
Log:
[WebAssembly] Make WebAssemblyStoreResults only return true when it has a change.

Modified:
    llvm/trunk/lib/Target/WebAssembly/WebAssemblyStoreResults.cpp

Modified: llvm/trunk/lib/Target/WebAssembly/WebAssemblyStoreResults.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/WebAssembly/WebAssemblyStoreResults.cpp?rev=255253&r1=255252&r2=255253&view=diff
==============================================================================
--- llvm/trunk/lib/Target/WebAssembly/WebAssemblyStoreResults.cpp (original)
+++ llvm/trunk/lib/Target/WebAssembly/WebAssemblyStoreResults.cpp Thu Dec 10 08:17:36 2015
@@ -71,6 +71,7 @@ bool WebAssemblyStoreResults::runOnMachi
 
   const MachineRegisterInfo &MRI = MF.getRegInfo();
   MachineDominatorTree &MDT = getAnalysis<MachineDominatorTree>();
+  bool Changed = false;
 
   assert(MRI.isSSA() && "StoreResults depends on SSA form");
 
@@ -108,6 +109,7 @@ bool WebAssemblyStoreResults::runOnMachi
             if (&MI == Where || !MDT.dominates(&MI, Where))
               continue;
           }
+          Changed = true;
           DEBUG(dbgs() << "Setting operand " << O << " in " << *Where
                        << " from " << MI << "\n");
           O.setReg(ToReg);
@@ -115,5 +117,5 @@ bool WebAssemblyStoreResults::runOnMachi
       }
   }
 
-  return true;
+  return Changed;
 }