GRIN is a compiler back-end for lazy and strict functional languages with whole program optimization support.
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GRIN

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The name GRIN is short for Graph Reduction Intermediate Notation, and it is an intermediate language for graph reduction. For an overview read The GRIN Project article. To grasp the details take your time and read Urban Boquist's PhD thesis on Code Optimisation Techniques for Lazy Functional Languages .

Simplifying Transformations

Transformation Schema
vectorisation
case simplification
split fetch operation
right hoist fetch operation
register introduction

Optimising Transformations