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The compiler is based on the original Portable C Compiler by S. C. Johnson, written in the late 70's. Even though much of the compiler has been rewritten, some of the basics still remain. The compiler is conceptually structured in two parts; pass1 which is language-dependent, does parsing, typechecking and build trees, and pass2 which is mostly language-independent. About 50% of the frontend code and 80% of the backend code has been rewritten. Most stuff is written by Anders Magnusson, with the exception of the data-flow analysis part and the SSA conversion code which is written by Peter A Jonsson, and the Mips port that were written as part of a project by undergraduate students at LTU. It was publicly announced to the NetBSD community on September 14, 2007. Shortly later it was imported to the OpenBSD, pkgsrc, and NetBSD source trees.
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