Reference 1
CompCert: A realistic, verified compiler.
By verified, we mean a compiler that is accompanied by a machine-checked proof of a semantic preservation property: the generated machine code behaves as prescribed by the semantics of the source program.
By realistic, we mean a compiler that could realistically be used in the context of production of critical software.
The first compiler proof in 19672, for the compilation of arithmetic expressions down to stack machine code; and mechanically verified in 19723.
A survey of compiler verification 4.
If you could revise
the fundmental principles of
computer system design
to improve security...
... what would you change?