SSA CFG: spill plan - #16965
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Description
Spill-store traces could reload a value from the same definition site before its memory slot had been initialized. For example, storing one result of a multi-return call could reload a later result before storing it, corrupting nonzero values.
Plan function-argument, block-entry phi, and operation-output stores in availability order and replay that recorded order. Newly discovered spills restart planning; each accepted store makes its owner available to subsequent traces. Emit all phi stores at block entry, independently of phi instruction order.
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gpt 6 xhigh did this