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Jonny Rhea 2026-03-03 09:26:28 -06:00 committed by GitHub
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core/vm/instructions.go
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@ -947,6 +947,7 @@ func opSelfdestruct6780(pc *uint64, evm *EVM, scope *ScopeContext) ([]byte, erro
}
// decodeSingle decodes the immediate operand of a backward-compatible DUPN or SWAPN instruction (EIP-8024)
// https://eips.ethereum.org/EIPS/eip-8024
func decodeSingle(x byte) int {
// Depths 1-16 are already covered by the legacy opcodes. The forbidden byte range [91, 127] removes
// 37 values from the 256 possible immediates, leaving 219 usable values, so this encoding covers depths
@ -959,6 +960,7 @@ func decodeSingle(x byte) int {
// instruction (EIP-8024) into stack indices (n, m) where 1 <= n < m
// and n + m <= 30. The forbidden byte range [82, 127] removes 46 values from
// the 256 possible immediates, leaving exactly 210 usable bytes.
// https://eips.ethereum.org/EIPS/eip-8024
func decodePair(x byte) (int, int) {
// XOR with 143 remaps the forbidden bytes [82, 127] to an unused corner
// of the 16x16 grid below.