Editing Optimizing compiler (section)

== History ==
Early compilers of the 1960s were often primarily concerned with simply compiling code correctly or efficiently, such that compile times were a major concern. One notable early optimizing compiler was the IBM FORTRAN H compiler of the late 1960s.<ref name="aho-sethi-ullman" />{{rp|page=737}} Another of the earliest and important optimizing compilers, that pioneered several advanced techniques, was that for [[BLISS]] (1970), which was described in ''[[The Design of an Optimizing Compiler]]'' (1975).<ref name="aho-sethi-ullman" />{{rp|pages=740, 779}} By the late 1980s, optimizing compilers were sufficiently effective that programming in assembly language declined. This co-evolved with the development of RISC chips and advanced processor features such as [[superscalar processor]]s, [[out-of-order execution]], and [[speculative execution]], which were designed to be targeted by optimizing compilers rather than by human-written assembly code.{{citation needed|date=April 2015}}