C Compiler OptimizationLevel 1

• Performs all level 0 functions, PLUS:

• Performs local copy / constant propagation

• Removes local dead assignments

• Eliminates local common sub-expressions

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The next level of optimization, level 1, does all of the level 0 optimizations plus more.

It performs constant propagation, and removes local dead assignments. It also eliminates local common sub-expressions. For instance, if there is a local subroutine that always assigns the variable Y the value of two, but never modifies Y again, that subroutine would be eliminated.