diff --git a/tools/gccas/gccas.cpp b/tools/gccas/gccas.cpp
index c46b29608a2..8ac8ed46909 100644
--- a/tools/gccas/gccas.cpp
+++ b/tools/gccas/gccas.cpp
@@ -103,6 +103,7 @@ void AddConfiguredTransformationPasses(PassManager &PM) {
   addPass(PM, createCFGSimplificationPass());    // Merge & remove BBs
   addPass(PM, createScalarReplAggregatesPass()); // Break up aggregate allocas
   addPass(PM, createInstructionCombiningPass()); // Combine silly seq's
+  addPass(PM, createPredicateSimplifierPass());  // Canonicalize registers
   addPass(PM, createCondPropagationPass());      // Propagate conditionals
 
   addPass(PM, createTailCallEliminationPass());  // Eliminate tail calls
diff --git a/tools/gccld/GenerateCode.cpp b/tools/gccld/GenerateCode.cpp
index 38b3d418451..2e81d38aac6 100644
--- a/tools/gccld/GenerateCode.cpp
+++ b/tools/gccld/GenerateCode.cpp
@@ -248,6 +248,7 @@ int llvm::GenerateBytecode(Module *M, int StripLevel, bool Internalize,
 
     // The IPO passes may leave cruft around.  Clean up after them.
     addPass(Passes, createInstructionCombiningPass());
+    addPass(Passes, createPredicateSimplifierPass());
 
     addPass(Passes, createScalarReplAggregatesPass()); // Break up allocas