Smallstack #83
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Smallstack #83
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* This change makes V128 operations treat stack values as 2 separate F64 values instead of taking up a single stack slot. The definition and instance still treat V128 types as single values, but the VM implementation and stack ops treat them as 2. * Smaller stack values have 2 advantages: 1. Speeding up the memcpy bottleneck when returning values from a function 2. Better cache coherency, fitting more stack space into a single cache line * Ops that previously operated on generic values, such as local ops, global ops, select, etc have been split into default (8-byte) and V128 (16 byte) versions that know the sizes of the stack values they need to manipulate. * Local indices, number of params, and number of return values now all have a fixup step where the values are adjusted according to the number of values a ValType occupies, where V128 values take 2, and the rest take 1.
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Closes #72 |
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