+ if (OptLevel > 1 && ExtraVectorizerPasses) {
+ // At higher optimization levels, try to clean up any runtime overlap and
+ // alignment checks inserted by the vectorizer. We want to track correllated
+ // runtime checks for two inner loops in the same outer loop, fold any
+ // common computations, hoist loop-invariant aspects out of any outer loop,
+ // and unswitch the runtime checks if possible. Once hoisted, we may have
+ // dead (or speculatable) control flows or more combining opportunities.
+ MPM.add(createEarlyCSEPass());
+ MPM.add(createCorrelatedValuePropagationPass());
+ MPM.add(createInstructionCombiningPass());
+ MPM.add(createLICMPass());
+ MPM.add(createLoopUnswitchPass(SizeLevel || OptLevel < 3));
+ MPM.add(createCFGSimplificationPass());
+ MPM.add(createInstructionCombiningPass());
+ }