Download Register Allocation for Programs in SSA Form by Sebastian Hack PDF
By Sebastian Hack
This publication investigates sign up allocation for courses in static single-assignment shape. Its major result's that the interference graphs of SSA-form courses are chordal. this offers the compiler certain wisdom over the sign in call for and enables setting apart spilling, project and coalescing. for every of those stages, we current tools in particular adapted to the SSA atmosphere and supply a primary assessment.
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Example text
3. The Φ-operation. 3 A spilling algorithm has to make sure that this condition is met by placing spill- and reloadoperations at suitable places. Two aspects demand special attention and are specific to spilling on the SSA form. 1 Φ-operations with Memory Operands A Φ-operation may define more variables as registers are available. Thus, an SSA-based spiller must not only insert spill and reloads but also rewrite Φoperations. Let k be the number of registers. After spilling, |res( ) M | ≤ k must hold for each label containing a Φ-operation.
Live ranges whose nodes are of insignificant degree are removed from the graph before starting. Thus, the algorithm only works on the critical part of the graph. 1 Graph-Coloring Register Allocation 29 4. Coloring does not follow the simplify/select-scheme but a priority-based scheme. Live ranges with higher priorities get colored earlier. The priority represents the savings from assigning a live range to a register instead of keeping it in memory. If a live range cannot be colored it is attempted to split it.
This led to an increasing importance of coalescing which culminated in the optimistic approach by Park and Moon. 1 Liveness, Interference and SSA In this section, we investigate the properties of interference in strict SSAform programs. 4), the interference graphs of SSA-form programs are chordal. Before turning to the discussion of liveness and interference, let us start with a remark on the special variable undef. 2, we introduced the dummy variable undef as a means to construct strict SSA-form programs.