feat(vm): promises #5
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source: openrelayxyz/cardinal-evm@6b555dd from that commit (sic): Pipelined EVM implementation CPUs regularly use instruction pipelining: https://en.wikipedia.org/wiki/Instruction_pipelining This allows them to have multiple operations executing in parallel when one instruction does not rely on the output of the immediately preceding instruction. This commit experiments with introducing a form of pipelining to the EVM. It shifts the stack from being uint256 values to essentially being promises for uint256 values. Mathematical operations on these promises produce new promises, allowing these operations to happen in the background where appropriate, and blocking only when the outcome of an operation is dependent on the resolved value of a stack value and cannot be deferred further. The hope is that allowing certain types of operations (such as state lookups) to happen in the background while operations that do not directly rely on the value of the state lookup can continue operating, only blocking when the value from the state lookup becomes a crucial piece of information.
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