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Trying to get some insight as to whether or not it's more optimal to call block.timestamp repeatedly for comparisons or to set a (memory) variable to hold the value and use it instead.
I've looked at the gas cost table here:
http://ethdocs.org/en/latest/contracts-and-transactions/account-types-gas-and-transactions.html
but am not certain about where block.timestamp fits in.
The TIMESTAMP op code costs 2 gas, according to the yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), Appendix G and Appendix H.
