Semantics-Preserving Transformations A number of ways in which a compiler can improve a program without changing the function it computes Common-sub expression elimination Copy propagation Dead-code elimination Constant folding CS308 Compiler Theory 7Semantics-Preserving Transformations • A number of ways in which a compiler can improve a program without ch i hf i i hang ing t he funct ion it computes – Common-sub expression elimination – Copy propagation Copy propagation – Dead-code elimination – Constant folding CS308 Compiler Theory 7