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How does ecrecover() in solidity work? Looking at ethervm.io there doesn't seem to be an opcode for ecrecover? To what bytes is a ecrecover() call compiled?

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    There's a precompiled contract for that; see here. Oct 17, 2020 at 15:35
  • Ah ok, ethereum has so many free bytes that they could use to build in those opcodes, why don't they?
    – Philogy
    Oct 17, 2020 at 15:49

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Pre-compiled contracts do not have an opcode but are rather run by making a message call to a particular address.

Ecrecover is a pre-compiled contract that is pointed at the address 0x0000000000000000000000000000000000000001

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