e/Peephole optimization

Information
has gloss	eng: In compiler theory, peephole optimization is a kind of optimization performed over a very small set of instructions in a segment of generated code. The set is called a "peephole" or a "window". It works by recognising sets of instructions that don't actually do anything, or that can be replaced by a leaner set of instructions.
lexicalization	eng: peephole optimization
instance of	c/Compiler optimizations