Retrofitting Lifetime Holes for Linear Scan Register Allocation
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Summary
This technical article discusses retrofitting lifetime holes onto linear scan register allocation algorithms, building upon previous work that adapted SSA (Static Single Assignment) to linear scan. The content focuses on compiler optimization techniques, specifically addressing how lifetime holes improve register allocation by better handling variable liveness patterns in linearized instruction sequences.
Key quotes
· 3 pulledLifetime holes come into play because a linearized sequence of instructions is not a great proxy for storing or using metadata about a program
This time, we're going to retrofit lifetime holes
Basically, we made it to 1997 linear scan, with small adaptations for allocating directly on SSA
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