This patent describes a method of compiling a computer program from a sequence of computer instructions including a plurality of first, set branch, instructions which each identify a target address for a branch and a plurality of associated second, effect branch instructions which each implement a branch to a target address. The method comprising the steps of: reading the computer instructions in blocks; allocating each set branch instruction to an initial node in a dominator tree, the initial node being the node which contains the corresponding effect branch instruction; for the first determining the effect of migrating set branch instructions to each of a set of ancestor nodes in the dominator tree based on a performance cost parameter and selecting an ancestor node with the best performance cost parameter; locating said set branch instruction at the selected ancestor node. Repeating the determining and locating steps for each of the set branch instructions

 
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