static cl::opt<bool>
RunVectorization("vectorize", cl::desc("Run vectorization passes"));
+static cl::opt<bool>
+UseGVNAfterVectorization("use-gvn-after-vectorization",
+ cl::init(false), cl::Hidden,
+ cl::desc("Run GVN instead of Early CSE after vectorization passes"));
+
PassManagerBuilder::PassManagerBuilder() {
OptLevel = 2;
SizeLevel = 0;
if (Vectorize) {
MPM.add(createBBVectorizePass());
MPM.add(createInstructionCombiningPass());
- if (OptLevel > 1)
- MPM.add(createGVNPass()); // Remove redundancies
+ if (OptLevel > 1 && UseGVNAfterVectorization)
+ MPM.add(createGVNPass()); // Remove redundancies
+ else
+ MPM.add(createEarlyCSEPass()); // Catch trivial redundancies
}
MPM.add(createAggressiveDCEPass()); // Delete dead instructions