NULLSTONE
Automated Compiler Performance Analysis Suite.
nullstone.com

Compiler Connection
A Resource for Compiler Developers and Those Who Use Their Products and Services.
compilerconnection.com

Compiler Books
Parsing, Code Generation, Optimization, Language Design, Debuggers, Compiler Theory
compilerbooks.com

Compiler Optimizations
Dead Code Elimination, Hoisting, Function Inlining, Loop Fusion, Code Motion, Constant Folding, ...
compileroptimizations.com