SIMD-0170: Reserve minimal CUs for builtins

SIMD-0170 (Reserve minimal CUs for builtins) is a Core Standard Solana Improvement Document by Tao Zhu (Anza); proposal status Activated.

Active on mainnet-beta since epoch 758; active on testnet since epoch 750; active on devnet since epoch 842.

Feature gates

• Feature gate: SIMD-0170: Reserve minimal CUs for builtin instructions #2562

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