addPass(PM, createCFGSimplificationPass()); // Merge & remove BBs
addPass(PM, createReassociatePass()); // Reassociate expressions
addPass(PM, createLICMPass()); // Hoist loop invariants
+ addPass(PM, createLoopUnswitchPass()); // Unswitch loops.
addPass(PM, createInstructionCombiningPass()); // Clean up after LICM/reassoc
addPass(PM, createIndVarSimplifyPass()); // Canonicalize indvars
addPass(PM, createLoopUnrollPass()); // Unroll small loops