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Register allocation regained much interest in recent years due to the development of decoupled strategies that split the problem into separate phases: spilling, register assignment, and copy elimination.Traditional approaches to copy elimination during register allocation are based on interference graphs and register coalescing. Variables are represented as nodes in a graph, which are coalesced, if...
Recent developments in register allocation, mostly linked to static single assignment (SSA) form, have shown that it is possible to decouple the problem in two successive phases: a first spilling phase places load and store instructions so that the register pressure at all program points is small enough, a second assignment and coalescing phase maps the remaining variables to physical registers and...
Graph coloring and linear scan are two appealing techniques for register allocation as the underlying formalism are extremely clean and simple. This paper advocates a decoupled approach that first lowers the register pressure by spilling variables, and then performs live ranges splitting/coalescing/coloring in a separate phase; this enables the design of simpler, cleaner, and more eficient register...
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